Do you want this big green box to go away? Well here's how...

Click here for full update

Wildcat! photo archives restored.

Click here for full update

Donors can now disable ads.

Click here for instructions

Add yourself to the user map.

Click here for instructions

Spring gear mod

Converted from Wildcat! database. (read only)
Locked
Bob Patterson

Spring gear mod

Post by Bob Patterson » Fri Feb 17, 2012 5:57 pm

Thanks for the photos & info, Alister !!!

My GOD !!! If <THAT> doesn't hold it, I don't know WHAT would !!!
Looks like a piece of railroad bridge is missing !!! :-) :-)

Thanks !!
....bobp

------------------------------orig.-----------------------------------
At 08:01 PM 8/25/00 +1200, you wrote:
Just a few thoughts to go with the photos that mike has made available.

Those that have been following this forum for a while will know I have had
a few problems with load dissipation into the fuse with the spring gear, all
that is in the archives.
I use my Rebel on rough strips very frequently and it became obvious that
braking loads have been causing stress on the lower door post area ( not
only braking loads but pot holes and rocks etc.)
I am also very concerned that the wing strut attach bracket is being used
to transfer these loads from the carrythrough to the lower door post ( you
cant rely on the 'sandwich' of the cabin floor ( SG14 & SG 13 etc.) to
dissipate these loads, this a very inefficient method, I beefed this area up
and it made no difference!) If you get someone to sit in the aircraft and
apply the brakes and get someone else to push backward and forward on the
prop simulating braking loads, you can feel the wing strut attach bracket
flexing backwards and forwards. ( You can measure this by clamping a piece
of angle on top of the gear leg facing back along the side of the fuse, then
measure the amount of deflection as you rock back and forward.) If this
happens long enough and often enough, over time stress points will appear in
these brackets. Not a good place to get cracks! ( I am really fond of those
wings staying in a consant angle relative to the fuse!!)
To counter this I placed a hard point on either side at the position where
the bungee gear would attach at the rear. I made up an I beam out of good
quality steel and attached this to the straddle brackets on the gear ( by
putting in longer bolts)and to the hard point at the rear.
This completely isolates these twisting loads before they enter the fuse, I
have been flying it for about three months so far and the system seems
bullet proof.( so far!)
I will issue my usual disclaimer! I do operate on rough strips regularly.
If you did not intend to operate in less than ideal places this mod may not
be necessary. This is the type of mod that if I decided to sell my aircraft
( I couldn't think why I should!) I would unbolt it ( about an hours work )
and put the fairings back on, I would place the I beams in the luggage
compartment and say to the new owner if he intends to operate in less than
ideal places he should consider bolting them on.
Hope this gives food for thought, no sense everybody reinventing the wheel.

Cheers

Alister

PS Looking at the photo of my Rebel I think I had better give it a clean
and sweep the Hangar floor!!
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=iso-8859-1" http-equiv=Content-Type>
<META content="MSHTML 5.00.2614.3500" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Just a few thoughts to go with the photos that
mike
has made available.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Those that have been following this forum for a
while will know I have had a few problems with load dissipation into the fuse
with the spring gear, all that is in the archives.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>I use my Rebel on rough strips very frequently
and
it became obvious that braking loads have been causing stress on the lower
door
post area ( not only braking loads but pot holes and rocks etc.)</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>I am also very concerned that the wing strut
attach
bracket is being used to transfer these loads from the carrythrough to the
lower
door post ( you cant rely on the 'sandwich' of the cabin floor ( SG14 & SG
13 etc.) to dissipate these loads,&nbsp;this a very inefficient method, I
beefed
this area up and it made no difference!) If you get someone to sit in the
aircraft and apply the brakes and get someone else to push backward and
forward
on the prop simulating braking loads, you can feel the wing strut attach
bracket
flexing backwards and forwards. ( You can measure this by clamping a piece of
angle on top of the gear leg facing back along the side of the fuse, then
measure the amount of deflection as you&nbsp;rock back and forward.)&nbsp; If
this happens long enough and often enough, over time stress points will appear
in these brackets. Not a good place to get cracks!&nbsp;( I am really fond of
those wings staying in a consant angle relative to the fuse!!)&nbsp;
</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>To counter this I placed a hard point on either
side at the position where the bungee gear would attach at the rear. I made up
an I beam out of good quality steel and attached this to the straddle brackets
on the gear ( by putting in longer bolts)and to the hard point at the rear.
</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>This completely isolates these twisting loads
before they enter the fuse, I have been flying&nbsp;it for about three
months so
far and the system seems bullet proof.( so far!)</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>I will issue my usual disclaimer! I do operate on
rough strips regularly. If you did not intend to&nbsp;operate in less than
ideal
places this mod may not be necessary. This is the type of mod that if I
decided
to sell my aircraft ( I couldn't think why I should!) I would unbolt it (
about
an hours work ) and put the fairings back on, I would place the I beams in
the&nbsp;luggage compartment and&nbsp;say to the new owner&nbsp;if he
intends to
operate in&nbsp;less than ideal places he should consider bolting them
on.&nbsp;</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Hope this gives food for thought, no sense
everybody reinventing&nbsp;the wheel.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Cheers</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Alister</FONT>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>PS Looking at the photo of my&nbsp;Rebel I
think I
had better give it a clean and sweep the Hangar floor!! </FONT></DIV>
<DIV><FONT face=Arial size=2>&nbsp; </FONT></DIV></BODY></HTML>
*-----------------------------------------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*-----------------------------------------------------------------------------------*




-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------

A G Yeoman

Spring gear mod

Post by A G Yeoman » Fri Feb 17, 2012 5:57 pm

Thanks Mike for creating a link to those photos, I just spent half an hour typing up a few notes to go with them, then I managed to delete the lot! ( I really hate that when it happens)

I have run out of time and will have to try again tomorrow

Cheers

Alister

A G Yeoman

Spring gear mod

Post by A G Yeoman » Fri Feb 17, 2012 5:57 pm

Just a few thoughts to go with the photos that mike has made available.

Those that have been following this forum for a while will know I have had a few problems with load dissipation into the fuse with the spring gear, all that is in the archives.

I use my Rebel on rough strips very frequently and it became obvious that braking loads have been causing stress on the lower door post area ( not only braking loads but pot holes and rocks etc.)

I am also very concerned that the wing strut attach bracket is being used to transfer these loads from the carrythrough to the lower door post ( you cant rely on the 'sandwich' of the cabin floor ( SG14 & SG 13 etc.) to dissipate these loads, this a very inefficient method, I beefed this area up and it made no difference!) If you get someone to sit in the aircraft and apply the brakes and get someone else to push backward and forward on the prop simulating braking loads, you can feel the wing strut attach bracket flexing backwards and forwards. ( You can measure this by clamping a piece of angle on top of the gear leg facing back along the side of the fuse, then measure the amount of deflection as you rock back and forward.) If this happens long enough and often enough, over time stress points will appear in these brackets. Not a good place to get cracks! ( I am really fond of those wings staying in a consant angle relative to the fuse!!)

To counter this I placed a hard point on either side at the position where the bungee gear would attach at the rear. I made up an I beam out of good quality steel and attached this to the straddle brackets on the gear ( by putting in longer bolts)and to the hard point at the rear.

This completely isolates these twisting loads before they enter the fuse, I have been flying it for about three months so far and the system seems bullet proof.( so far!)

I will issue my usual disclaimer! I do operate on rough strips regularly. If you did not intend to operate in less than ideal places this mod may not be necessary. This is the type of mod that if I decided to sell my aircraft ( I couldn't think why I should!) I would unbolt it ( about an hours work ) and put the fairings back on, I would place the I beams in the luggage compartment and say to the new owner if he intends to operate in less than ideal places he should consider bolting them on.

Hope this gives food for thought, no sense everybody reinventing the wheel.

Cheers

Alister

PS Looking at the photo of my Rebel I think I had better give it a clean and sweep the Hangar floor!!

Bob Patterson

Spring gear mod

Post by Bob Patterson » Fri Feb 17, 2012 5:57 pm

We hit our share of rough strips on the Ramble this time - especially
Whetstone, MT !! It was about 3,500 ft long, but narrow, with barbed
wire on both sides, and seemed to have been plowed crosswise, before
the fences went up !! It was a 98 degree day, at about 4,500 ft ASL ....
bumpy, gusty thermals, and a gusty 20 mph 90 degree crosswind !!
That, plus a bunch of prairie-dog holes in the bumps made it VERY
exciting !!! Several took 2 tries to get in - including me !!

We landed there to clear Customs - the border runs right down
the middle of the runway, so you don't have to file a flight plan !!
Sometimes I wonder if maybe it might be worthwhile just to do the
flight plan and go somewhere NICE !!! :-)

Have over 30 hours now in the Super, and I'm really impressed !
It's just like a big inflated Rebel - light ailerons, decent roll rate
(it IS a BIG airplane), and it booogeys right along - about 150 + mph !!
What really impresses the Cessna drivers is the low speed maneuverability
and stability - I do things you just can't do with a C-180 !! Like
steep turns after level flight at 45 KT !!! And you can dump the
flaps from full to negative in a 60 Kt climb, and all it does is
shrug and smile !!! All this with 4 people and full fuel, and
lots of baggage !!!!!

I flew the original with the tricycle gear, and THAT is THE
BEST trike I've ever seen !! The nose gear is on a massive leaf spring,
steerable, and has the same size wheel as the main gear !! That is
the ONLY tricycle geared aircraft <I> could see using in the rough
terrain .... Boy, can it land short !

The airframe stuff is pretty well sorted out, but there's LOTS
to do on details. This one has the prototype interior panels - beige
plastic door & headliners. They really dress it up nicely, and compliment
the leather seats ! But the door and window latches still need work,
as do many other little details - hard to say just how much of this
stuff the factory should be doing, as every builder wants something
a bit different (!), but I guess we have to have at least ONE complete
interior to show and sell ...

There are still minor gear fixes going on - latest was just
shipped out to builders, I think .... It's hard to believe that
anything could move those massive machined gear supports, but -
it's a BIG airplane, and 3,000 + pounds on that LONG, TALL gear
REALLY puts on some loads. Anyway, it just keeps getting better -
and there's more good stuff coming soon ..... ;-) (If I tell
you, I'd have to shoot you !!! ;-) ) (but it will be retro-fittable)

Flew the Super out of a rough grass strip near Ottawa - it
had a 15 or 20 foot high hill at one end, with less than 300 feet of
smooth run before the hill. I went out alone, with full flap, low on
fuel, and was off the ground and climbing BEFORE the hill !!! Almost
as good as the Rebel ;-) :-) :-)

It's a LOT of airplane - certainly more than I could afford to
feed (30.4 gallons/hour on takeoff !!!) but, if someone really needs
4 seats and 330 lb. of baggage, plus 80 gallons of fuel, and wants
to go cross country FAST, this is THE machine !! Would LOVE to have one
for the Ramble - we could have a full bar in the back, and a barbeque,
and a hot tub .... :-)

For most people, the regular Rebel is all they really need -
it's light, nimble, and flies like a sports car !! I'm looking forward
to getting my new Rebel (with O-320 !!) all set up - interior, paint,
and amphibs ..... All I need is money - anybody want to buy a nice
Rebel with a 912 ??? Serial Number 001 is up for sale, and I'm VERY
"motivated" !!! :-)

Must get going - we're in the middle of the National Airshow
at Brampton, and I'm demo'ing the Super .... Leave for B.C. on Monday,
if the weather's good ... (It's a tough job ..... ;-) :-) )
Only another 3,000 miles to cross ....

Next Rebel Builders meeting is Sunday, Sept. 17th, at Brampton
RAA clubhouse at 1 pm....... Should be back home by then !!

....bobp

--------------------------------orig.---------------------------------------
At 11:08 PM 8/26/00 +1200, you wrote:
I tell you Bob, I landed on a strip the other day that was so rough I had to
recycle the GPS again to get it going, it gave up the ghost! No joking!

You've just done a bit of time in the Super Rebel, What do you really
think??
Can it really handle it?

Alister

----- Original Message -----
From: Bob Patterson <bob.patterson@canrem.com>
To: Murphy Rebel Builders List <murphy-rebel@dcsol.com>
Sent: Saturday, August 26, 2000 4:08 PM
Subject: Re: Spring gear mod

Thanks for the photos & info, Alister !!!

My GOD !!! If <THAT> doesn't hold it, I don't know WHAT would !!!
Looks like a piece of railroad bridge is missing !!! :-) :-)

Thanks !!
....bobp

------------------------------orig.-----------------------------------
At 08:01 PM 8/25/00 +1200, you wrote:
Just a few thoughts to go with the photos that mike has made available.

Those that have been following this forum for a while will know I have
had
a few problems with load dissipation into the fuse with the spring gear,
all
that is in the archives.
I use my Rebel on rough strips very frequently and it became obvious that
braking loads have been causing stress on the lower door post area ( not
only braking loads but pot holes and rocks etc.)
I am also very concerned that the wing strut attach bracket is being used
to transfer these loads from the carrythrough to the lower door post ( you
cant rely on the 'sandwich' of the cabin floor ( SG14 & SG 13 etc.) to
dissipate these loads, this a very inefficient method, I beefed this area
up
and it made no difference!) If you get someone to sit in the aircraft and
apply the brakes and get someone else to push backward and forward on the
prop simulating braking loads, you can feel the wing strut attach bracket
flexing backwards and forwards. ( You can measure this by clamping a piece
of angle on top of the gear leg facing back along the side of the fuse,
then
measure the amount of deflection as you rock back and forward.) If this
happens long enough and often enough, over time stress points will appear
in
these brackets. Not a good place to get cracks! ( I am really fond of
those
wings staying in a consant angle relative to the fuse!!)
To counter this I placed a hard point on either side at the position
where
the bungee gear would attach at the rear. I made up an I beam out of good
quality steel and attached this to the straddle brackets on the gear ( by
putting in longer bolts)and to the hard point at the rear.
This completely isolates these twisting loads before they enter the fuse,
I
have been flying it for about three months so far and the system seems
bullet proof.( so far!)
I will issue my usual disclaimer! I do operate on rough strips regularly.
If you did not intend to operate in less than ideal places this mod may
not
be necessary. This is the type of mod that if I decided to sell my
aircraft
( I couldn't think why I should!) I would unbolt it ( about an hours
work )
and put the fairings back on, I would place the I beams in the luggage
compartment and say to the new owner if he intends to operate in less than
ideal places he should consider bolting them on.
Hope this gives food for thought, no sense everybody reinventing the
wheel.
Cheers

Alister

PS Looking at the photo of my Rebel I think I had better give it a clean
and sweep the Hangar floor!!
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=iso-8859-1" http-equiv=Content-Type>
<META content="MSHTML 5.00.2614.3500" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Just a few thoughts to go with the photos
that
mike
has made available.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Those that have been following this forum
for a
while will know I have had a few problems with load dissipation into the
fuse
with the spring gear, all that is in the archives.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>I use my Rebel on rough strips very
frequently
and
it became obvious that braking loads have been causing stress on the
lower
door
post area ( not only braking loads but pot holes and rocks
etc.)</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>I am also very concerned that the wing strut
attach
bracket is being used to transfer these loads from the carrythrough to
the
lower
door post ( you cant rely on the 'sandwich' of the cabin floor ( SG14
& SG
13 etc.) to dissipate these loads,&nbsp;this a very inefficient method, I
beefed
this area up and it made no difference!) If you get someone to sit in the
aircraft and apply the brakes and get someone else to push backward and
forward
on the prop simulating braking loads, you can feel the wing strut attach
bracket
flexing backwards and forwards. ( You can measure this by clamping a
piece of
angle on top of the gear leg facing back along the side of the fuse, then
measure the amount of deflection as you&nbsp;rock back and
forward.)&nbsp; If
this happens long enough and often enough, over time stress points will
appear
in these brackets. Not a good place to get cracks!&nbsp;( I am really
fond of
those wings staying in a consant angle relative to the fuse!!)&nbsp;
</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>To counter this I placed a hard point on
either
side at the position where the bungee gear would attach at the rear. I
made up
an I beam out of good quality steel and attached this to the straddle
brackets
on the gear ( by putting in longer bolts)and to the hard point at the
rear.
</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>This completely isolates these twisting
loads
before they enter the fuse, I have been flying&nbsp;it for about three
months so
far and the system seems bullet proof.( so far!)</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>I will issue my usual disclaimer! I do
operate on
rough strips regularly. If you did not intend to&nbsp;operate in less
than
ideal
places this mod may not be necessary. This is the type of mod that if I
decided
to sell my aircraft ( I couldn't think why I should!) I would unbolt it (
about
an hours work ) and put the fairings back on, I would place the I beams
in
the&nbsp;luggage compartment and&nbsp;say to the new owner&nbsp;if he
intends to
operate in&nbsp;less than ideal places he should consider bolting them
on.&nbsp;</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Hope this gives food for thought, no sense
everybody reinventing&nbsp;the wheel.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Cheers</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Alister</FONT>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>PS Looking at the photo of my&nbsp;Rebel I
think I
had better give it a clean and sweep the Hangar floor!! </FONT></DIV>
<DIV><FONT face=Arial size=2>&nbsp; </FONT></DIV></BODY></HTML>
*---------------------------------------------------------------------------
--------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*---------------------------------------------------------------------------
--------*

*--------------------------------------------------------------------------
---------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*--------------------------------------------------------------------------
---------*

*-----------------------------------------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*-----------------------------------------------------------------------------------*




-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------

A G Yeoman

Spring gear mod

Post by A G Yeoman » Fri Feb 17, 2012 5:57 pm

I tell you Bob, I landed on a strip the other day that was so rough I had to
recycle the GPS again to get it going, it gave up the ghost! No joking!

You've just done a bit of time in the Super Rebel, What do you really
think??
Can it really handle it?

Alister

----- Original Message -----
From: Bob Patterson <bob.patterson@canrem.com>
To: Murphy Rebel Builders List <murphy-rebel@dcsol.com>
Sent: Saturday, August 26, 2000 4:08 PM
Subject: Re: Spring gear mod

Thanks for the photos & info, Alister !!!

My GOD !!! If <THAT> doesn't hold it, I don't know WHAT would !!!
Looks like a piece of railroad bridge is missing !!! :-) :-)

Thanks !!
....bobp

------------------------------orig.-----------------------------------
At 08:01 PM 8/25/00 +1200, you wrote:
Just a few thoughts to go with the photos that mike has made available.

Those that have been following this forum for a while will know I have
had
a few problems with load dissipation into the fuse with the spring gear,
all
that is in the archives.
I use my Rebel on rough strips very frequently and it became obvious that
braking loads have been causing stress on the lower door post area ( not
only braking loads but pot holes and rocks etc.)
I am also very concerned that the wing strut attach bracket is being used
to transfer these loads from the carrythrough to the lower door post ( you
cant rely on the 'sandwich' of the cabin floor ( SG14 & SG 13 etc.) to
dissipate these loads, this a very inefficient method, I beefed this area
up
and it made no difference!) If you get someone to sit in the aircraft and
apply the brakes and get someone else to push backward and forward on the
prop simulating braking loads, you can feel the wing strut attach bracket
flexing backwards and forwards. ( You can measure this by clamping a piece
of angle on top of the gear leg facing back along the side of the fuse,
then
measure the amount of deflection as you rock back and forward.) If this
happens long enough and often enough, over time stress points will appear
in
these brackets. Not a good place to get cracks! ( I am really fond of
those
wings staying in a consant angle relative to the fuse!!)
To counter this I placed a hard point on either side at the position
where
the bungee gear would attach at the rear. I made up an I beam out of good
quality steel and attached this to the straddle brackets on the gear ( by
putting in longer bolts)and to the hard point at the rear.
This completely isolates these twisting loads before they enter the fuse,
I
have been flying it for about three months so far and the system seems
bullet proof.( so far!)
I will issue my usual disclaimer! I do operate on rough strips regularly.
If you did not intend to operate in less than ideal places this mod may
not
be necessary. This is the type of mod that if I decided to sell my
aircraft
( I couldn't think why I should!) I would unbolt it ( about an hours
work )
and put the fairings back on, I would place the I beams in the luggage
compartment and say to the new owner if he intends to operate in less than
ideal places he should consider bolting them on.
Hope this gives food for thought, no sense everybody reinventing the
wheel.
Cheers

Alister

PS Looking at the photo of my Rebel I think I had better give it a clean
and sweep the Hangar floor!!
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=iso-8859-1" http-equiv=Content-Type>
<META content="MSHTML 5.00.2614.3500" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Just a few thoughts to go with the photos
that
mike
has made available.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Those that have been following this forum
for a
while will know I have had a few problems with load dissipation into the
fuse
with the spring gear, all that is in the archives.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>I use my Rebel on rough strips very
frequently
and
it became obvious that braking loads have been causing stress on the
lower
door
post area ( not only braking loads but pot holes and rocks
etc.)</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>I am also very concerned that the wing strut
attach
bracket is being used to transfer these loads from the carrythrough to
the
lower
door post ( you cant rely on the 'sandwich' of the cabin floor ( SG14
& SG
13 etc.) to dissipate these loads,&nbsp;this a very inefficient method, I
beefed
this area up and it made no difference!) If you get someone to sit in the
aircraft and apply the brakes and get someone else to push backward and
forward
on the prop simulating braking loads, you can feel the wing strut attach
bracket
flexing backwards and forwards. ( You can measure this by clamping a
piece of
angle on top of the gear leg facing back along the side of the fuse, then
measure the amount of deflection as you&nbsp;rock back and
forward.)&nbsp; If
this happens long enough and often enough, over time stress points will
appear
in these brackets. Not a good place to get cracks!&nbsp;( I am really
fond of
those wings staying in a consant angle relative to the fuse!!)&nbsp;
</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>To counter this I placed a hard point on
either
side at the position where the bungee gear would attach at the rear. I
made up
an I beam out of good quality steel and attached this to the straddle
brackets
on the gear ( by putting in longer bolts)and to the hard point at the
rear.
</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>This completely isolates these twisting
loads
before they enter the fuse, I have been flying&nbsp;it for about three
months so
far and the system seems bullet proof.( so far!)</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>I will issue my usual disclaimer! I do
operate on
rough strips regularly. If you did not intend to&nbsp;operate in less
than
ideal
places this mod may not be necessary. This is the type of mod that if I
decided
to sell my aircraft ( I couldn't think why I should!) I would unbolt it (
about
an hours work ) and put the fairings back on, I would place the I beams
in
the&nbsp;luggage compartment and&nbsp;say to the new owner&nbsp;if he
intends to
operate in&nbsp;less than ideal places he should consider bolting them
on.&nbsp;</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Hope this gives food for thought, no sense
everybody reinventing&nbsp;the wheel.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Cheers</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Alister</FONT>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>PS Looking at the photo of my&nbsp;Rebel I
think I
had better give it a clean and sweep the Hangar floor!! </FONT></DIV>
<DIV><FONT face=Arial size=2>&nbsp; </FONT></DIV></BODY></HTML>
*---------------------------------------------------------------------------
--------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*---------------------------------------------------------------------------
--------*

*-----------------------------------------------------------------------------------*
The Murphy Rebel Builders List is for the discussion
between builders and owners of Murphy Rebel aircraft.
Archives located at:
http://www.dcsol.com/murphy-rebel/lists/default.htm
*-----------------------------------------------------------------------------------*




-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------


Locked