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Building my SR

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Mike Kimball

Building my SR

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

Someone on the list is interested in hearing how slowly I am progressing on
the fuselage for my Super Rebel. So here goes...The basic tailcone went
together very easily and quickly. Then the hard part. The cabin. The
"torsion box" where the main gear attaches is one of the first things that
gets built. That part was pretty fun. Sure seems stout. Then I got to the
sills. You have to do lots of fitting, cutting, refitting, etc. The only
tool I had that could cut the thick aluminum was a jigsaw. It worked, but
it was difficult. Incidentally, after I had finished riveting the sills on
with 3/16 rivets I had an opportunity to see the demonstrator and noted that
it was riveted on with 1/8 rivets. I couldn't wait to get back and check
the instructions. Sure enough, it says to use 3/16 rivets. The two topmost
rivets are so close together, the heads actually touch each other. Clearly
designed at one time to use 1/8 rivets. They must have changed their minds
later. If you want two rivets in each flange tab the sills attach to, there
is no choice for the topmost flange tab: When using 3/16 rivets they will
be very close. The other part I don't enjoy too much on the fuselage is
that you have to fabricate a lot of little tabs to connect various bulkheads
and channels together. When fitting the cabin roof I was dismayed to see
that when aligning the front of the sheet with the wing carrythrough the
cabin hung over the edge of the fuselage ribs way more on one side than the
other. You can intentionally tweak the entire cabin structure to get the
skin to align, but then it doesn't lay flat on the upper bulkheads and the
cabin would be out of true. I opted to true up the cabin structure,
measuring up, down, left, right, comparing one side to the other, etc., then
I trimmed the cabin top, taking much more material off one side than the
other. It should also be noted that the cabin had to be clamped in place
when true, then parts were drilled and clecoed. It definitely wasn't very
close to true when allowed to take it's own shape.

I just discovered the other day that the plans set you up for a big problem
later on by having you rivet the sills on without installing the bolts that
hold the lower gear attach brackets in place first. Now there is no way to
install the bolts without drilling a hole in the sill. Oh well. Four water
drain holes for the fuselage.

The plans also have you attaching the tailcone to the cabin at the bottom
only, pretty early on. Don't do that. Leave the tailcone unriveted until
everything on the tailcone and cargo area shear webs are final drilled.
There were lots of occasions where it was convenient to be able to separate
the cabin and tailcone.

I have finished about 14 hours of deburring and am now ready to rivet the
corner wraps in place and the tailcone to the fuselage. I was planning on
riveting the corner wraps from the back to the front, then I would rivet the
last four corner wraps at the same time I rivet the tailcone to the cabin.
Sound OK to you folks?

Sure seems funny that the tailcone is attached so well to the cabin at the
bottom, and so minimally at the top and sides. Apparently the greatest
force trying to separate the tailcone from the cabin is the force the
tailwheel exerts on the structure. The downward force of the horizontal
stabilizer and sidewards force from the rudder when deflected in flight must
be much less or there would be a stronger connection between the cabin and
tailcone at the top and sides. I was actually toying with running some
stringers at the top and sides. Anyone else do anything like that?

Mike Kimball
SR #044




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Fred Darnell

Building my SR

Post by Fred Darnell » Fri Feb 17, 2012 9:17 pm

Hi Mike,

Hang in there. I'm a little ahead of you and it gets better. A couple of
answers for you. It's OK to rivet the wraps from the back to the front and
then the forward-most wraps when you rivet the tailcone to the cabin. Check
for true as you go as you did while you were drilling to #30. Just don't
rivet the top rear wrap. You'll need access to the front of the last
bulkhead to attach the vertical stab and elevator pulleys. I don't think you
should worry about the attachment between tailcone and cabin as a few
doublers get added later than span from the side and top skins on the cabin
to the side and top skins of the tailcone. Also, for what it's worth, my top
skin fit perfectly flat with an equal amount trimmed from each side, and I
didn't experience any of the un-evenness you speak of. I think Murphy sent
out a bulletin or note or something regarding the gear bolts, but regardless
you'll have to have holes under the bolts anyway to check for security or to
replace bolts later if needed. The best thing to do is to make the holes
before you rivet the sills in place. I forgot to on one side and had to
drill the access holes while in place, on the other I drilled the holes
prior to riveting the sills.

-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Mike Kimball
Sent: Monday, October 08, 2001 2:03 PM
To: murphy-rebel@dcsol.com
Subject: Building my SR


*-------------------------------------------------------------------------*
The list archives are located at:
http://www.dcsol.com:81/public/default.htm
username: rebel password: builder
*-------------------------------------------------------------------------*
Someone on the list is interested in hearing how slowly I am progressing on
the fuselage for my Super Rebel. So here goes...The basic tailcone went
together very easily and quickly. Then the hard part. The cabin. The
"torsion box" where the main gear attaches is one of the first things that
gets built. That part was pretty fun. Sure seems stout. Then I got to the
sills. You have to do lots of fitting, cutting, refitting, etc. The only
tool I had that could cut the thick aluminum was a jigsaw. It worked, but
it was difficult. Incidentally, after I had finished riveting the sills on
with 3/16 rivets I had an opportunity to see the demonstrator and noted that
it was riveted on with 1/8 rivets. I couldn't wait to get back and check
the instructions. Sure enough, it says to use 3/16 rivets. The two topmost
rivets are so close together, the heads actually touch each other. Clearly
designed at one time to use 1/8 rivets. They must have changed their minds
later. If you want two rivets in each flange tab the sills attach to, there
is no choice for the topmost flange tab: When using 3/16 rivets they will
be very close. The other part I don't enjoy too much on the fuselage is
that you have to fabricate a lot of little tabs to connect various bulkheads
and channels together. When fitting the cabin roof I was dismayed to see
that when aligning the front of the sheet with the wing carrythrough the
cabin hung over the edge of the fuselage ribs way more on one side than the
other. You can intentionally tweak the entire cabin structure to get the
skin to align, but then it doesn't lay flat on the upper bulkheads and the
cabin would be out of true. I opted to true up the cabin structure,
measuring up, down, left, right, comparing one side to the other, etc., then
I trimmed the cabin top, taking much more material off one side than the
other. It should also be noted that the cabin had to be clamped in place
when true, then parts were drilled and clecoed. It definitely wasn't very
close to true when allowed to take it's own shape.

I just discovered the other day that the plans set you up for a big problem
later on by having you rivet the sills on without installing the bolts that
hold the lower gear attach brackets in place first. Now there is no way to
install the bolts without drilling a hole in the sill. Oh well. Four water
drain holes for the fuselage.

The plans also have you attaching the tailcone to the cabin at the bottom
only, pretty early on. Don't do that. Leave the tailcone unriveted until
everything on the tailcone and cargo area shear webs are final drilled.
There were lots of occasions where it was convenient to be able to separate
the cabin and tailcone.

I have finished about 14 hours of deburring and am now ready to rivet the
corner wraps in place and the tailcone to the fuselage. I was planning on
riveting the corner wraps from the back to the front, then I would rivet the
last four corner wraps at the same time I rivet the tailcone to the cabin.
Sound OK to you folks?

Sure seems funny that the tailcone is attached so well to the cabin at the
bottom, and so minimally at the top and sides. Apparently the greatest
force trying to separate the tailcone from the cabin is the force the
tailwheel exerts on the structure. The downward force of the horizontal
stabilizer and sidewards force from the rudder when deflected in flight must
be much less or there would be a stronger connection between the cabin and
tailcone at the top and sides. I was actually toying with running some
stringers at the top and sides. Anyone else do anything like that?

Mike Kimball
SR #044

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Tim Saxton

Building my SR

Post by Tim Saxton » Fri Feb 17, 2012 9:17 pm

Mike and othe SR builders,

My SR is about at the same stage. Corner wraps have all be installed and
drilled to #40. Nice to be working on the fuselage - it's starting to look
like an airplane.

I did rivet the tailcone to the cabin botton as per instructions. Did not
have a problem. There were a few things that I did that made installing the
1/8" angles to the cargo area shear webs easier (using some hints from
previous posts):

* when building the cabin don't rivet the angles for the middle shear webs
to the cabin, just cleco
* for the angles that can be removed, I positioned the angles then
backdrilled a #40 hole at the front and back, then removed and used an extra
shear web as template to drill all holes to #40. This was easier than
drilling all holes in place
* I purchased a right angle attachment for my Dremel tool, worked well in
tight spaces, just make sure you use sharp drill bits.
* for bottom middle two shear webs (which are riveted to cabin) you can
pivot one of the angle pairs up which will give you access to the other,
backdrill to #40. Restore pivoted angle into place, then backdrill it to
#40. Easy now to drill to #30 using the original pilot holes in shear web.
Last few holes nearest cabin can't be accessed angle is pivoted, so I had to
drilled between the shear web pilot holes.

One problem I'm having is the sill to bottom corner wrap transition. I have
a gap. I used a metal shrinker on the corner wrap but this still leaves a
gap. Can't see how to shrink or bend the sill unless this is done before the
cabin is built, too late for me now. MAM suggests trimming the sill
extremely short and filling with Proseal fillet. That's probably what I'll
do.

As I see the fuselage taking shape I'm thinking more about engine choices. I
would like to use a "modern" engine but there don't seem to be a lot of good
choices, and I'm not enough of an experimenter to entertain doing my own
auto conversion. Are there any SR builders planning on using the Crossflow
engines? As far as I know there are none flying in SRs. I wished some of the
planned 2 stroke diesels were available, but this appears to be only a dream
as who knows if/when these engine choices will arrive.

Tim Saxton
SR 060

-----Original Message-----
From: Mike Kimball [mailto:agt@mosquitonet.com]
Sent: Monday, October 08, 2001 11:03 AM
To: murphy-rebel@dcsol.com
Subject: Building my SR


*-------------------------------------------------------------------------*
The list archives are located at:
http://www.dcsol.com:81/public/default.htm
username: rebel password: builder
*-------------------------------------------------------------------------*
Someone on the list is interested in hearing how slowly I am progressing on
the fuselage for my Super Rebel. So here goes...The basic tailcone went
together very easily and quickly. Then the hard part. The cabin. The
"torsion box" where the main gear attaches is one of the first things that
gets built. That part was pretty fun. Sure seems stout. Then I got to the
sills. You have to do lots of fitting, cutting, refitting, etc. The only
tool I had that could cut the thick aluminum was a jigsaw. It worked, but
it was difficult. Incidentally, after I had finished riveting the sills on
with 3/16 rivets I had an opportunity to see the demonstrator and noted that
it was riveted on with 1/8 rivets. I couldn't wait to get back and check
the instructions. Sure enough, it says to use 3/16 rivets. The two topmost
rivets are so close together, the heads actually touch each other. Clearly
designed at one time to use 1/8 rivets. They must have changed their minds
later. If you want two rivets in each flange tab the sills attach to, there
is no choice for the topmost flange tab: When using 3/16 rivets they will
be very close. The other part I don't enjoy too much on the fuselage is
that you have to fabricate a lot of little tabs to connect various bulkheads
and channels together. When fitting the cabin roof I was dismayed to see
that when aligning the front of the sheet with the wing carrythrough the
cabin hung over the edge of the fuselage ribs way more on one side than the
other. You can intentionally tweak the entire cabin structure to get the
skin to align, but then it doesn't lay flat on the upper bulkheads and the
cabin would be out of true. I opted to true up the cabin structure,
measuring up, down, left, right, comparing one side to the other, etc., then
I trimmed the cabin top, taking much more material off one side than the
other. It should also be noted that the cabin had to be clamped in place
when true, then parts were drilled and clecoed. It definitely wasn't very
close to true when allowed to take it's own shape.

I just discovered the other day that the plans set you up for a big problem
later on by having you rivet the sills on without installing the bolts that
hold the lower gear attach brackets in place first. Now there is no way to
install the bolts without drilling a hole in the sill. Oh well. Four water
drain holes for the fuselage.

The plans also have you attaching the tailcone to the cabin at the bottom
only, pretty early on. Don't do that. Leave the tailcone unriveted until
everything on the tailcone and cargo area shear webs are final drilled.
There were lots of occasions where it was convenient to be able to separate
the cabin and tailcone.

I have finished about 14 hours of deburring and am now ready to rivet the
corner wraps in place and the tailcone to the fuselage. I was planning on
riveting the corner wraps from the back to the front, then I would rivet the
last four corner wraps at the same time I rivet the tailcone to the cabin.
Sound OK to you folks?

Sure seems funny that the tailcone is attached so well to the cabin at the
bottom, and so minimally at the top and sides. Apparently the greatest
force trying to separate the tailcone from the cabin is the force the
tailwheel exerts on the structure. The downward force of the horizontal
stabilizer and sidewards force from the rudder when deflected in flight must
be much less or there would be a stronger connection between the cabin and
tailcone at the top and sides. I was actually toying with running some
stringers at the top and sides. Anyone else do anything like that?

Mike Kimball
SR #044

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Bob Patterson

Building my SR

Post by Bob Patterson » Fri Feb 17, 2012 9:17 pm

Hi Tim !

There are several Crossflow engines flying - I've flown at least
one of them in a Rebel. They tell me there's one SR flying with a
six cylinder Subaru, and another almost ready to go.....

Looks like a good choice - 250 hp to about 320 hp., good fuel
economy, and reliability, with cheap parts readily available.

Several of the new diesel engines are flying already, but only
prototypes, for the most part. Lots of promising stuff coming - might
be available in 2 or 3 years ...
....bobp

------------------------------orig.--------------------------------------
At 06:00 PM 10/9/01 -0700, you wrote:
*-------------------------------------------------------------------------*
The list archives are located at:
http://www.dcsol.com:81/public/default.htm
username: rebel password: builder
*-------------------------------------------------------------------------*

Mike and othe SR builders,

My SR is about at the same stage. Corner wraps have all be installed and
drilled to #40. Nice to be working on the fuselage - it's starting to look
like an airplane.

I did rivet the tailcone to the cabin botton as per instructions. Did not
have a problem. There were a few things that I did that made installing the
1/8" angles to the cargo area shear webs easier (using some hints from
previous posts):

* when building the cabin don't rivet the angles for the middle shear webs
to the cabin, just cleco
* for the angles that can be removed, I positioned the angles then
backdrilled a #40 hole at the front and back, then removed and used an extra
shear web as template to drill all holes to #40. This was easier than
drilling all holes in place
* I purchased a right angle attachment for my Dremel tool, worked well in
tight spaces, just make sure you use sharp drill bits.
* for bottom middle two shear webs (which are riveted to cabin) you can
pivot one of the angle pairs up which will give you access to the other,
backdrill to #40. Restore pivoted angle into place, then backdrill it to
#40. Easy now to drill to #30 using the original pilot holes in shear web.
Last few holes nearest cabin can't be accessed angle is pivoted, so I had to
drilled between the shear web pilot holes.

One problem I'm having is the sill to bottom corner wrap transition. I have
a gap. I used a metal shrinker on the corner wrap but this still leaves a
gap. Can't see how to shrink or bend the sill unless this is done before the
cabin is built, too late for me now. MAM suggests trimming the sill
extremely short and filling with Proseal fillet. That's probably what I'll
do.

As I see the fuselage taking shape I'm thinking more about engine choices. I
would like to use a "modern" engine but there don't seem to be a lot of good
choices, and I'm not enough of an experimenter to entertain doing my own
auto conversion. Are there any SR builders planning on using the Crossflow
engines? As far as I know there are none flying in SRs. I wished some of the
planned 2 stroke diesels were available, but this appears to be only a dream
as who knows if/when these engine choices will arrive.

Tim Saxton
SR 060

-----Original Message-----
From: Mike Kimball [mailto:agt@mosquitonet.com]
Sent: Monday, October 08, 2001 11:03 AM
To: murphy-rebel@dcsol.com
Subject: Building my SR


*-------------------------------------------------------------------------*
The list archives are located at:
http://www.dcsol.com:81/public/default.htm
username: rebel password: builder
*-------------------------------------------------------------------------*
Someone on the list is interested in hearing how slowly I am progressing on
the fuselage for my Super Rebel. So here goes...The basic tailcone went
together very easily and quickly. Then the hard part. The cabin. The
"torsion box" where the main gear attaches is one of the first things that
gets built. That part was pretty fun. Sure seems stout. Then I got to the
sills. You have to do lots of fitting, cutting, refitting, etc. The only
tool I had that could cut the thick aluminum was a jigsaw. It worked, but
it was difficult. Incidentally, after I had finished riveting the sills on
with 3/16 rivets I had an opportunity to see the demonstrator and noted that
it was riveted on with 1/8 rivets. I couldn't wait to get back and check
the instructions. Sure enough, it says to use 3/16 rivets. The two topmost
rivets are so close together, the heads actually touch each other. Clearly
designed at one time to use 1/8 rivets. They must have changed their minds
later. If you want two rivets in each flange tab the sills attach to, there
is no choice for the topmost flange tab: When using 3/16 rivets they will
be very close. The other part I don't enjoy too much on the fuselage is
that you have to fabricate a lot of little tabs to connect various bulkheads
and channels together. When fitting the cabin roof I was dismayed to see
that when aligning the front of the sheet with the wing carrythrough the
cabin hung over the edge of the fuselage ribs way more on one side than the
other. You can intentionally tweak the entire cabin structure to get the
skin to align, but then it doesn't lay flat on the upper bulkheads and the
cabin would be out of true. I opted to true up the cabin structure,
measuring up, down, left, right, comparing one side to the other, etc., then
I trimmed the cabin top, taking much more material off one side than the
other. It should also be noted that the cabin had to be clamped in place
when true, then parts were drilled and clecoed. It definitely wasn't very
close to true when allowed to take it's own shape.

I just discovered the other day that the plans set you up for a big problem
later on by having you rivet the sills on without installing the bolts that
hold the lower gear attach brackets in place first. Now there is no way to
install the bolts without drilling a hole in the sill. Oh well. Four water
drain holes for the fuselage.

The plans also have you attaching the tailcone to the cabin at the bottom
only, pretty early on. Don't do that. Leave the tailcone unriveted until
everything on the tailcone and cargo area shear webs are final drilled.
There were lots of occasions where it was convenient to be able to separate
the cabin and tailcone.

I have finished about 14 hours of deburring and am now ready to rivet the
corner wraps in place and the tailcone to the fuselage. I was planning on
riveting the corner wraps from the back to the front, then I would rivet the
last four corner wraps at the same time I rivet the tailcone to the cabin.
Sound OK to you folks?

Sure seems funny that the tailcone is attached so well to the cabin at the
bottom, and so minimally at the top and sides. Apparently the greatest
force trying to separate the tailcone from the cabin is the force the
tailwheel exerts on the structure. The downward force of the horizontal
stabilizer and sidewards force from the rudder when deflected in flight must
be much less or there would be a stronger connection between the cabin and
tailcone at the top and sides. I was actually toying with running some
stringers at the top and sides. Anyone else do anything like that?

Mike Kimball
SR #044

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Jason Beall

Building my SR

Post by Jason Beall » Fri Feb 17, 2012 9:17 pm

Thanks Mike.

Although a LONG way away from building my fuselage
(just starting wings), posts like that are invaluable.
I have printed it out and am going to stick it in the
builders manual at the front of the fuselage section
to remind me to read it before I start building.

-Jason


--- Mike Kimball <agt@mosquitonet.com> wrote:
*-------------------------------------------------------------------------*
The list archives are located at:
http://www.dcsol.com:81/public/default.htm
username: rebel password: builder
*-------------------------------------------------------------------------*
Someone on the list is interested in hearing how
slowly I am progressing on
the fuselage for my Super Rebel. So here goes...The
basic tailcone went
together very easily and quickly. Then the hard
part. The cabin. The
"torsion box" where the main gear attaches is one of
the first things that
gets built. That part was pretty fun. Sure seems
stout. Then I got to the
sills. You have to do lots of fitting, cutting,
refitting, etc. The only
tool I had that could cut the thick aluminum was a
jigsaw. It worked, but
it was difficult. Incidentally, after I had
finished riveting the sills on
with 3/16 rivets I had an opportunity to see the
demonstrator and noted that
it was riveted on with 1/8 rivets. I couldn't wait
to get back and check
the instructions. Sure enough, it says to use 3/16
rivets. The two topmost
rivets are so close together, the heads actually
touch each other. Clearly
designed at one time to use 1/8 rivets. They must
have changed their minds
later. If you want two rivets in each flange tab
the sills attach to, there
is no choice for the topmost flange tab: When using
3/16 rivets they will
be very close. The other part I don't enjoy too
much on the fuselage is
that you have to fabricate a lot of little tabs to
connect various bulkheads
and channels together. When fitting the cabin roof
I was dismayed to see
that when aligning the front of the sheet with the
wing carrythrough the
cabin hung over the edge of the fuselage ribs way
more on one side than the
other. You can intentionally tweak the entire cabin
structure to get the
skin to align, but then it doesn't lay flat on the
upper bulkheads and the
cabin would be out of true. I opted to true up the
cabin structure,
measuring up, down, left, right, comparing one side
to the other, etc., then
I trimmed the cabin top, taking much more material
off one side than the
other. It should also be noted that the cabin had
to be clamped in place
when true, then parts were drilled and clecoed. It
definitely wasn't very
close to true when allowed to take it's own shape.

I just discovered the other day that the plans set
you up for a big problem
later on by having you rivet the sills on without
installing the bolts that
hold the lower gear attach brackets in place first.
Now there is no way to
install the bolts without drilling a hole in the
sill. Oh well. Four water
drain holes for the fuselage.

The plans also have you attaching the tailcone to
the cabin at the bottom
only, pretty early on. Don't do that. Leave the
tailcone unriveted until
everything on the tailcone and cargo area shear webs
are final drilled.
There were lots of occasions where it was convenient
to be able to separate
the cabin and tailcone.

I have finished about 14 hours of deburring and am
now ready to rivet the
corner wraps in place and the tailcone to the
fuselage. I was planning on
riveting the corner wraps from the back to the
front, then I would rivet the
last four corner wraps at the same time I rivet the
tailcone to the cabin.
Sound OK to you folks?

Sure seems funny that the tailcone is attached so
well to the cabin at the
bottom, and so minimally at the top and sides.
Apparently the greatest
force trying to separate the tailcone from the cabin
is the force the
tailwheel exerts on the structure. The downward
force of the horizontal
stabilizer and sidewards force from the rudder when
deflected in flight must
be much less or there would be a stronger connection
between the cabin and
tailcone at the top and sides. I was actually
toying with running some
stringers at the top and sides. Anyone else do
anything like that?

Mike Kimball
SR #044

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=====
________________________________________________

Jason Beall
Super Rebel No. 131
Aberdeen, Scotland, UK
super_rebel131@yahoo.com

__________________________________________________
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Mike Davis

Building my SR

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

Hi Tim,

I have asked a lot of questions about this myself since I am leaning toward
the Crossflow engine. In May of this year Crossflow reported that they had
1 SR flying with their 6 cylinder conversion, and another about 1 month out.
You might try contacting them directly and ask for a reference. What ever
you find out, I'd love to hear about it too.

Mike

----- Original Message -----
From: "Tim Saxton" <Tim_Saxton@CreoScitex.com>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, October 09, 2001 5:00 PM
Subject: RE: Building my SR
Mike and othe SR builders,

As I see the fuselage taking shape I'm thinking more about engine choices.
I
would like to use a "modern" engine but there don't seem to be a lot of
good
choices, and I'm not enough of an experimenter to entertain doing my own
auto conversion. Are there any SR builders planning on using the Crossflow
engines? As far as I know there are none flying in SRs. I wished some of
the
planned 2 stroke diesels were available, but this appears to be only a
dream
as who knows if/when these engine choices will arrive.

Tim Saxton
SR 060



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