Rebel - Tail Spring
Posted: Sat Feb 18, 2012 12:01 am
Wayne:
I had to bend my tailspring 14 1/2* in order to make the bolt vertical.I
took it to Alberta Aircraft Overhaul. They said that because the original
radius was a slow bend being no where near the bend radius for this
thickness of aluminum that we could cold bend it. We proceded to put it in a
hydraulic press and bend it.This worked fine. I reviewed this with MAM also
beforehand and they thought that this would be fine. Cold bending because of
the slow bend.
Just a thought
Murray
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Wednesday, November 19, 2003 3:03 PM
To: murphy-rebel@dcsol.com
Subject: Rebel - Tail Spring
Inspect your aluminum tailsprings closely before installation guys and make
sure they are not cracked anywhere.
I stripped the paint off the one I am working on, before a planned
reinstallation. I noticed that there are small cracks on each edge of the
TOP surface, at the bend where it clamps to the fuselage. I put it in my
press to put a little pressure on it and these opened right up and extended
towards the center of the spring on an angle, and extend down in to the
spring about 3/32 and then go in the same direction as the spring length
like delaminated plywood.
Note that these cracks could not be caused by landing loads. These are
tension cracks in the top outside radius of the bend from manufacturing!
Landing load cracks would be in the lower surface.
I discussed bending of aluminum this thick with Chris Heinz this summer, as
to how they fabricated their landing gear leafs for the CH2000/CH601/701/801
etc. He told me if done "cold", at room temperature of the facility, they
would crack immediately with small outer radius cracks. "The alum needs to
be heated and they bend just fine", he said.. Heating for him is laying the
flat raw material out in the sun, on a hot summer day, for a few hours. Says
you can't pick them up bare handed they get so hot and they bring them in
and immediately bend them without any problems. They try to do their full
years spring leaf run this way, but if they have to do it any other time of
year they have to heat the blanks (and I forget the temp he stated). I don't
know how Murphy does it, but I suspect COLD. Does anyone here know...
GRANT!?!
Cheers,
Wayne
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I had to bend my tailspring 14 1/2* in order to make the bolt vertical.I
took it to Alberta Aircraft Overhaul. They said that because the original
radius was a slow bend being no where near the bend radius for this
thickness of aluminum that we could cold bend it. We proceded to put it in a
hydraulic press and bend it.This worked fine. I reviewed this with MAM also
beforehand and they thought that this would be fine. Cold bending because of
the slow bend.
Just a thought
Murray
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Wednesday, November 19, 2003 3:03 PM
To: murphy-rebel@dcsol.com
Subject: Rebel - Tail Spring
Inspect your aluminum tailsprings closely before installation guys and make
sure they are not cracked anywhere.
I stripped the paint off the one I am working on, before a planned
reinstallation. I noticed that there are small cracks on each edge of the
TOP surface, at the bend where it clamps to the fuselage. I put it in my
press to put a little pressure on it and these opened right up and extended
towards the center of the spring on an angle, and extend down in to the
spring about 3/32 and then go in the same direction as the spring length
like delaminated plywood.
Note that these cracks could not be caused by landing loads. These are
tension cracks in the top outside radius of the bend from manufacturing!
Landing load cracks would be in the lower surface.
I discussed bending of aluminum this thick with Chris Heinz this summer, as
to how they fabricated their landing gear leafs for the CH2000/CH601/701/801
etc. He told me if done "cold", at room temperature of the facility, they
would crack immediately with small outer radius cracks. "The alum needs to
be heated and they bend just fine", he said.. Heating for him is laying the
flat raw material out in the sun, on a hot summer day, for a few hours. Says
you can't pick them up bare handed they get so hot and they bring them in
and immediately bend them without any problems. They try to do their full
years spring leaf run this way, but if they have to do it any other time of
year they have to heat the blanks (and I forget the temp he stated). I don't
know how Murphy does it, but I suspect COLD. Does anyone here know...
GRANT!?!
Cheers,
Wayne
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