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Super Rebel - Elevator Construction thoughts!

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Wayne G. O'Shea

Super Rebel - Elevator Construction thoughts!

Post by Wayne G. O'Shea » Fri Feb 17, 2012 9:59 pm

Been waiting almost a month now for my forward float fittings (and some
other parts for other projects) so I can complete the gear box mods, so in
the mean time I have been working on the 3500 upgrades to the Stab and
Elevator to keep me going. Boy I'll tell you a 90* angle drill and a
threaded bit about 1/2" long is the cats meow to back drill the "strap" area
instead of doing the plastic transfer system!

Just finishing up the upgrades on the Elevator and then today I was working
on straightening out the balance tips, that were constructed previously a
little twisted, and also the trim tab "upgrade" (from the old -4A and
internal linkage to the -8A servo and external linkage and horns) and have a
few thoughts to offer to those that are (or will be) doing the same. Like I
say I'm offering the "thoughts"! MAM has last authority on everything and if
you chose to follow my suggestions you do so at your own risk!

When it comes time to do the elevator tips do yourself an favour and build a
simple jig to hold things straight. DO NOT proceed as spelled out in the
manual as this is how Rob got them built twisted. I found I had to uncleco
the outboard rib on one side and the inboard on the other side so I could
twist the assembly back straight and then was able to drill these now offset
holes to 5/32 to clean up and hold straight. The next thing was that using
the skin holes as punched (that overlap onto the elevator spar and skin)
made the tips locate other than straight and in fact had the tips drooping
about 3/8" from what should have been straight. Therefore I had to adjust
the overlaps location a bit to get thinks straight and ended up with 5/32 on
one side and 3/16 on the other in the outer 4 holes that had already been
drilled. Luckily the other 6 holes per side hadn't been drilled yet.

What I suggest to do when building new is to make a simple jig with a length
of board or aluminum angle to pick up the 4 tooling holes on the end ribs.
That is the two tooling holes in the outboard elevator rib face and the 2
holes in the outboard tip rib face. Measure for there locations and then
drill the 4 holes in a straight line on your jig "fixture". Then put a 3/16
bolt in each of the holes and peg the ribs in a straight line with each
other. Then drill your tip skin to the ribs and then the overlap splice.

If you have an older kit and also have to upgrade from the internal to the
external trim servo hook up I offer the following. First make sure you get
your new -8A servo from MAM and return the -4A! The upgrade instructions
show to put the two attach horns, that go on the elevator, simply on the
skin of the finished trim tab. I can tell you right now that won't last much
past the first nose up trim application, from experience with the Rebel's
smaller trim tab cracking the spar and skin with the same style horn
attached to it in a similar manner. Can't imagine it holding at all on the
SR tab, that is at least 4 times the area as the Rebels. The newer
instructions for building, although not really mentioned in the
instructions, show a drawing of two ribs under the horns. I opened up the
finished trim tab, removed the eyebolt from the internal linkage setup and
added the two ribs (used the ribs removed from the inboard edges of the
elevator during the 3500 upgrade). I also added a .025" gusset plate that
covers from the outboard ribs first 3 rivets across the new double rib to
pick up the horns and then about 2 rivets past the double rib onto the hinge
spar. I also added a corner gusset on the other ends rib to hinge spar
junction (in a triangle 3 rivets each way), as well as the center rib with
a triangular gusset while I had it opened. Thought it could use the strength
as the ribs were only tied in with the skin and a single rivet at the spar,
as no angle brackets spelled out in OLD instructions. I see they are in the
new instructions with a quick line to make some 90* tabs. All three of these
gussets are installed on top of the ribs, under the skin and slipped under
the spar flange for a smooth skin.

ALSO FOR ALL SR's! The Mac-8A servo has the threaded actuator screw
protruding out the opposite end of the unit from the clevis attachment end.
Not mentioned in the manual but, you will need to drill a clearance hole
through the spar so this can extend out to allow ANY nose up travel of the
unit. The threaded screw extends about an inch from the unit with full up
elevator travel, and the servo itself only sits about 3/8" from the spar! If
you don't drill the hole in the spar you will get full nose down trim, but a
jammed (trying to run) servo rod chewing into the spar for nose up. Not a
good thing :>( !!

I also found, on my previously finished elevator, that the "hinge" spar at
the trim tab cutout is basically held in place by the top/bottom skins and
that there is no call out in the manual for brackets to hold it to the full
length elevator rib at either end of the cut out area (probably assumed to
be done, but obviously that doesn't work!). In this configuration you can
flex the trim cutout area up and down in relation to the full length areas
and as such sooner or later the skin is going to crack at the corners of the
trim tab cut out. If you haven't closed it up yet get some angles at the
junctions to tie it all together. If closed already just put the angles
externally (as I did) to stiffen this area up and tie it all together.

Regards,
Wayne G. O'Shea
www.irishfield.on.ca





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Mike Kimball

Super Rebel - Elevator Construction thoughts!

Post by Mike Kimball » Fri Feb 17, 2012 9:59 pm

Regarding the clearances needed for the trim servo rod, an easy way to check
everything is to just hold the wires from the servo on the terminals of a
regular 9V battery. There's enough juice to run the servo, albeit probably
a bit slower than the 12V it will eventually get. Just switch the wires to
run the other way. I tested mine stop to stop in this manner.

Mike Kimball
SR#044

-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Monday, March 04, 2002 5:28 PM
To: murphy-rebel@dcsol.com
Subject: Super Rebel - Elevator Construction thoughts!


Been waiting almost a month now for my forward float fittings (and some
other parts for other projects) so I can complete the gear box mods, so in
the mean time I have been working on the 3500 upgrades to the Stab and
Elevator to keep me going. Boy I'll tell you a 90* angle drill and a
threaded bit about 1/2" long is the cats meow to back drill the "strap" area
instead of doing the plastic transfer system!

Just finishing up the upgrades on the Elevator and then today I was working
on straightening out the balance tips, that were constructed previously a
little twisted, and also the trim tab "upgrade" (from the old -4A and
internal linkage to the -8A servo and external linkage and horns) and have a
few thoughts to offer to those that are (or will be) doing the same. Like I
say I'm offering the "thoughts"! MAM has last authority on everything and if
you chose to follow my suggestions you do so at your own risk!

When it comes time to do the elevator tips do yourself an favour and build a
simple jig to hold things straight. DO NOT proceed as spelled out in the
manual as this is how Rob got them built twisted. I found I had to uncleco
the outboard rib on one side and the inboard on the other side so I could
twist the assembly back straight and then was able to drill these now offset
holes to 5/32 to clean up and hold straight. The next thing was that using
the skin holes as punched (that overlap onto the elevator spar and skin)
made the tips locate other than straight and in fact had the tips drooping
about 3/8" from what should have been straight. Therefore I had to adjust
the overlaps location a bit to get thinks straight and ended up with 5/32 on
one side and 3/16 on the other in the outer 4 holes that had already been
drilled. Luckily the other 6 holes per side hadn't been drilled yet.

What I suggest to do when building new is to make a simple jig with a length
of board or aluminum angle to pick up the 4 tooling holes on the end ribs.
That is the two tooling holes in the outboard elevator rib face and the 2
holes in the outboard tip rib face. Measure for there locations and then
drill the 4 holes in a straight line on your jig "fixture". Then put a 3/16
bolt in each of the holes and peg the ribs in a straight line with each
other. Then drill your tip skin to the ribs and then the overlap splice.

If you have an older kit and also have to upgrade from the internal to the
external trim servo hook up I offer the following. First make sure you get
your new -8A servo from MAM and return the -4A! The upgrade instructions
show to put the two attach horns, that go on the elevator, simply on the
skin of the finished trim tab. I can tell you right now that won't last much
past the first nose up trim application, from experience with the Rebel's
smaller trim tab cracking the spar and skin with the same style horn
attached to it in a similar manner. Can't imagine it holding at all on the
SR tab, that is at least 4 times the area as the Rebels. The newer
instructions for building, although not really mentioned in the
instructions, show a drawing of two ribs under the horns. I opened up the
finished trim tab, removed the eyebolt from the internal linkage setup and
added the two ribs (used the ribs removed from the inboard edges of the
elevator during the 3500 upgrade). I also added a .025" gusset plate that
covers from the outboard ribs first 3 rivets across the new double rib to
pick up the horns and then about 2 rivets past the double rib onto the hinge
spar. I also added a corner gusset on the other ends rib to hinge spar
junction (in a triangle 3 rivets each way), as well as the center rib with
a triangular gusset while I had it opened. Thought it could use the strength
as the ribs were only tied in with the skin and a single rivet at the spar,
as no angle brackets spelled out in OLD instructions. I see they are in the
new instructions with a quick line to make some 90* tabs. All three of these
gussets are installed on top of the ribs, under the skin and slipped under
the spar flange for a smooth skin.

ALSO FOR ALL SR's! The Mac-8A servo has the threaded actuator screw
protruding out the opposite end of the unit from the clevis attachment end.
Not mentioned in the manual but, you will need to drill a clearance hole
through the spar so this can extend out to allow ANY nose up travel of the
unit. The threaded screw extends about an inch from the unit with full up
elevator travel, and the servo itself only sits about 3/8" from the spar! If
you don't drill the hole in the spar you will get full nose down trim, but a
jammed (trying to run) servo rod chewing into the spar for nose up. Not a
good thing :>( !!

I also found, on my previously finished elevator, that the "hinge" spar at
the trim tab cutout is basically held in place by the top/bottom skins and
that there is no call out in the manual for brackets to hold it to the full
length elevator rib at either end of the cut out area (probably assumed to
be done, but obviously that doesn't work!). In this configuration you can
flex the trim cutout area up and down in relation to the full length areas
and as such sooner or later the skin is going to crack at the corners of the
trim tab cut out. If you haven't closed it up yet get some angles at the
junctions to tie it all together. If closed already just put the angles
externally (as I did) to stiffen this area up and tie it all together.

Regards,
Wayne G. O'Shea
www.irishfield.on.ca



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Wayne G. O'Shea

Super Rebel - Elevator Construction thoughts!

Post by Wayne G. O'Shea » Fri Feb 17, 2012 9:59 pm

Yes, been there many times Mike and I always run it both ways fully and then
stop it in it's center of travel, for initial neutral set up of the trim tab
(as a matter of fact many ultralight fliers use a 9volt battery as their
only power source for the mac trim servo!). If you haven't installed yours
into the elevator yet you will find that you need the hole as mentioned,
through the spar, to allow you to use any of the servo movement in the nose
up (clevis pulled towards the unit) direction. This is unless of course MAM
changed something in regards to the location of the servo on newer kits to
move the servo closer to the trim tab. I also found that the supplied
threaded rod was just barely long enough and only allowed about 3/8" of
thread into each clevis.

Cheers,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "Mike Kimball" <mkimball@gci.net>
To: <murphy-rebel@dcsol.com>
Sent: Monday, March 04, 2002 10:28 PM
Subject: RE: Super Rebel - Elevator Construction thoughts!

Regarding the clearances needed for the trim servo rod, an easy way to
check
everything is to just hold the wires from the servo on the terminals of a
regular 9V battery. There's enough juice to run the servo, albeit
probably
a bit slower than the 12V it will eventually get. Just switch the wires
to
run the other way. I tested mine stop to stop in this manner.

Mike Kimball
SR#044

-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Monday, March 04, 2002 5:28 PM
To: murphy-rebel@dcsol.com
Subject: Super Rebel - Elevator Construction thoughts!


Been waiting almost a month now for my forward float fittings (and some
other parts for other projects) so I can complete the gear box mods, so in
the mean time I have been working on the 3500 upgrades to the Stab and
Elevator to keep me going. Boy I'll tell you a 90* angle drill and a
threaded bit about 1/2" long is the cats meow to back drill the "strap"
area
instead of doing the plastic transfer system!

Just finishing up the upgrades on the Elevator and then today I was
working
on straightening out the balance tips, that were constructed previously a
little twisted, and also the trim tab "upgrade" (from the old -4A and
internal linkage to the -8A servo and external linkage and horns) and have
a
few thoughts to offer to those that are (or will be) doing the same. Like
I
say I'm offering the "thoughts"! MAM has last authority on everything and
if
you chose to follow my suggestions you do so at your own risk!

When it comes time to do the elevator tips do yourself an favour and build
a
simple jig to hold things straight. DO NOT proceed as spelled out in the
manual as this is how Rob got them built twisted. I found I had to uncleco
the outboard rib on one side and the inboard on the other side so I could
twist the assembly back straight and then was able to drill these now
offset
holes to 5/32 to clean up and hold straight. The next thing was that using
the skin holes as punched (that overlap onto the elevator spar and skin)
made the tips locate other than straight and in fact had the tips drooping
about 3/8" from what should have been straight. Therefore I had to adjust
the overlaps location a bit to get thinks straight and ended up with 5/32
on
one side and 3/16 on the other in the outer 4 holes that had already been
drilled. Luckily the other 6 holes per side hadn't been drilled yet.

What I suggest to do when building new is to make a simple jig with a
length
of board or aluminum angle to pick up the 4 tooling holes on the end ribs.
That is the two tooling holes in the outboard elevator rib face and the 2
holes in the outboard tip rib face. Measure for there locations and then
drill the 4 holes in a straight line on your jig "fixture". Then put a
3/16
bolt in each of the holes and peg the ribs in a straight line with each
other. Then drill your tip skin to the ribs and then the overlap splice.

If you have an older kit and also have to upgrade from the internal to the
external trim servo hook up I offer the following. First make sure you get
your new -8A servo from MAM and return the -4A! The upgrade instructions
show to put the two attach horns, that go on the elevator, simply on the
skin of the finished trim tab. I can tell you right now that won't last
much
past the first nose up trim application, from experience with the Rebel's
smaller trim tab cracking the spar and skin with the same style horn
attached to it in a similar manner. Can't imagine it holding at all on the
SR tab, that is at least 4 times the area as the Rebels. The newer
instructions for building, although not really mentioned in the
instructions, show a drawing of two ribs under the horns. I opened up the
finished trim tab, removed the eyebolt from the internal linkage setup and
added the two ribs (used the ribs removed from the inboard edges of the
elevator during the 3500 upgrade). I also added a .025" gusset plate that
covers from the outboard ribs first 3 rivets across the new double rib to
pick up the horns and then about 2 rivets past the double rib onto the
hinge
spar. I also added a corner gusset on the other ends rib to hinge spar
junction (in a triangle 3 rivets each way), as well as the center rib
with
a triangular gusset while I had it opened. Thought it could use the
strength
as the ribs were only tied in with the skin and a single rivet at the
spar,
as no angle brackets spelled out in OLD instructions. I see they are in
the
new instructions with a quick line to make some 90* tabs. All three of
these
gussets are installed on top of the ribs, under the skin and slipped under
the spar flange for a smooth skin.

ALSO FOR ALL SR's! The Mac-8A servo has the threaded actuator screw
protruding out the opposite end of the unit from the clevis attachment
end.
Not mentioned in the manual but, you will need to drill a clearance hole
through the spar so this can extend out to allow ANY nose up travel of the
unit. The threaded screw extends about an inch from the unit with full up
elevator travel, and the servo itself only sits about 3/8" from the spar!
If
you don't drill the hole in the spar you will get full nose down trim, but
a
jammed (trying to run) servo rod chewing into the spar for nose up. Not a
good thing :>( !!

I also found, on my previously finished elevator, that the "hinge" spar at
the trim tab cutout is basically held in place by the top/bottom skins and
that there is no call out in the manual for brackets to hold it to the
full
length elevator rib at either end of the cut out area (probably assumed to
be done, but obviously that doesn't work!). In this configuration you can
flex the trim cutout area up and down in relation to the full length areas
and as such sooner or later the skin is going to crack at the corners of
the
trim tab cut out. If you haven't closed it up yet get some angles at the
junctions to tie it all together. If closed already just put the angles
externally (as I did) to stiffen this area up and tie it all together.

Regards,
Wayne G. O'Shea
www.irishfield.on.ca



** To unsubscribe, send e-mail to list-server@dcsol.com with
**
** UNSUBSCRIBE MURPHY-REBEL in the message body on a line by itself
**
**
** To contact the list admin, e-mail mike.davis@dcsol.com
**

** To unsubscribe, send e-mail to list-server@dcsol.com with
**
** UNSUBSCRIBE MURPHY-REBEL in the message body on a line by itself
**
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Wayne G. O'Shea

Super Rebel - Elevator Construction thoughts!

Post by Wayne G. O'Shea » Fri Feb 17, 2012 9:59 pm

I guess I should also add that I am presuming that the supplied plate for
the servo motor, that has all prepunched holes for ribs/spar/inspection hole
etc, also had the holes prepunched for the motor location (mine had already
been drilled to #18 for the bolts as Rob had previously fitted the -4A servo
motor). If it didn't I guess you could move the motor forward about 5/8",
but I'm not going out to the shop in a blizzard to see if that's even
possible with the skin hole/plate coverage. Will look at it tomorrow for
future work, but this one will stay where it is with a clearance hole
through the spar for the actuator screw!

Wayne

----- Original Message -----
From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
To: <murphy-rebel@dcsol.com>
Sent: Monday, March 04, 2002 10:32 PM
Subject: Re: Super Rebel - Elevator Construction thoughts!

Yes, been there many times Mike and I always run it both ways fully and
then
stop it in it's center of travel, for initial neutral set up of the trim
tab
(as a matter of fact many ultralight fliers use a 9volt battery as their
only power source for the mac trim servo!). If you haven't installed yours
into the elevator yet you will find that you need the hole as mentioned,
through the spar, to allow you to use any of the servo movement in the
nose
up (clevis pulled towards the unit) direction. This is unless of course
MAM
changed something in regards to the location of the servo on newer kits to
move the servo closer to the trim tab. I also found that the supplied
threaded rod was just barely long enough and only allowed about 3/8" of
thread into each clevis.

Cheers,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "Mike Kimball" <mkimball@gci.net>
To: <murphy-rebel@dcsol.com>
Sent: Monday, March 04, 2002 10:28 PM
Subject: RE: Super Rebel - Elevator Construction thoughts!

Regarding the clearances needed for the trim servo rod, an easy way to
check
everything is to just hold the wires from the servo on the terminals of
a
regular 9V battery. There's enough juice to run the servo, albeit
probably
a bit slower than the 12V it will eventually get. Just switch the wires
to
run the other way. I tested mine stop to stop in this manner.

Mike Kimball
SR#044

-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Monday, March 04, 2002 5:28 PM
To: murphy-rebel@dcsol.com
Subject: Super Rebel - Elevator Construction thoughts!


Been waiting almost a month now for my forward float fittings (and some
other parts for other projects) so I can complete the gear box mods, so
in
the mean time I have been working on the 3500 upgrades to the Stab and
Elevator to keep me going. Boy I'll tell you a 90* angle drill and a
threaded bit about 1/2" long is the cats meow to back drill the "strap"
area
instead of doing the plastic transfer system!

Just finishing up the upgrades on the Elevator and then today I was
working
on straightening out the balance tips, that were constructed previously
a
little twisted, and also the trim tab "upgrade" (from the old -4A and
internal linkage to the -8A servo and external linkage and horns) and
have
a
few thoughts to offer to those that are (or will be) doing the same.
Like
I
say I'm offering the "thoughts"! MAM has last authority on everything
and
if
you chose to follow my suggestions you do so at your own risk!

When it comes time to do the elevator tips do yourself an favour and
build
a
simple jig to hold things straight. DO NOT proceed as spelled out in the
manual as this is how Rob got them built twisted. I found I had to
uncleco
the outboard rib on one side and the inboard on the other side so I
could
twist the assembly back straight and then was able to drill these now
offset
holes to 5/32 to clean up and hold straight. The next thing was that
using
the skin holes as punched (that overlap onto the elevator spar and skin)
made the tips locate other than straight and in fact had the tips
drooping
about 3/8" from what should have been straight. Therefore I had to
adjust
the overlaps location a bit to get thinks straight and ended up with
5/32
on
one side and 3/16 on the other in the outer 4 holes that had already
been
drilled. Luckily the other 6 holes per side hadn't been drilled yet.

What I suggest to do when building new is to make a simple jig with a
length
of board or aluminum angle to pick up the 4 tooling holes on the end
ribs.
That is the two tooling holes in the outboard elevator rib face and the
2
holes in the outboard tip rib face. Measure for there locations and then
drill the 4 holes in a straight line on your jig "fixture". Then put a
3/16
bolt in each of the holes and peg the ribs in a straight line with each
other. Then drill your tip skin to the ribs and then the overlap splice.

If you have an older kit and also have to upgrade from the internal to
the
external trim servo hook up I offer the following. First make sure you
get
your new -8A servo from MAM and return the -4A! The upgrade instructions
show to put the two attach horns, that go on the elevator, simply on the
skin of the finished trim tab. I can tell you right now that won't last
much
past the first nose up trim application, from experience with the
Rebel's
smaller trim tab cracking the spar and skin with the same style horn
attached to it in a similar manner. Can't imagine it holding at all on
the
SR tab, that is at least 4 times the area as the Rebels. The newer
instructions for building, although not really mentioned in the
instructions, show a drawing of two ribs under the horns. I opened up
the
finished trim tab, removed the eyebolt from the internal linkage setup
and
added the two ribs (used the ribs removed from the inboard edges of the
elevator during the 3500 upgrade). I also added a .025" gusset plate
that
covers from the outboard ribs first 3 rivets across the new double rib
to
pick up the horns and then about 2 rivets past the double rib onto the
hinge
spar. I also added a corner gusset on the other ends rib to hinge spar
junction (in a triangle 3 rivets each way), as well as the center rib
with
a triangular gusset while I had it opened. Thought it could use the
strength
as the ribs were only tied in with the skin and a single rivet at the
spar,
as no angle brackets spelled out in OLD instructions. I see they are in
the
new instructions with a quick line to make some 90* tabs. All three of
these
gussets are installed on top of the ribs, under the skin and slipped
under
the spar flange for a smooth skin.

ALSO FOR ALL SR's! The Mac-8A servo has the threaded actuator screw
protruding out the opposite end of the unit from the clevis attachment
end.
Not mentioned in the manual but, you will need to drill a clearance hole
through the spar so this can extend out to allow ANY nose up travel of
the
unit. The threaded screw extends about an inch from the unit with full
up
elevator travel, and the servo itself only sits about 3/8" from the
spar!
If
you don't drill the hole in the spar you will get full nose down trim,
but
a
jammed (trying to run) servo rod chewing into the spar for nose up. Not
a
good thing :>( !!

I also found, on my previously finished elevator, that the "hinge" spar
at
the trim tab cutout is basically held in place by the top/bottom skins
and
that there is no call out in the manual for brackets to hold it to the
full
length elevator rib at either end of the cut out area (probably assumed
to
be done, but obviously that doesn't work!). In this configuration you
can
flex the trim cutout area up and down in relation to the full length
areas
and as such sooner or later the skin is going to crack at the corners of
the
trim tab cut out. If you haven't closed it up yet get some angles at the
junctions to tie it all together. If closed already just put the angles
externally (as I did) to stiffen this area up and tie it all together.

Regards,
Wayne G. O'Shea
www.irishfield.on.ca



** To unsubscribe, send e-mail to list-server@dcsol.com with
**
** UNSUBSCRIBE MURPHY-REBEL in the message body on a line by itself
**
**
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**

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