[rebel-builders] Landing Gear: was Empty weights
Posted: Sun Feb 19, 2012 6:30 pm
I really appreciate the gear discussion. More about what really took place
and type of failure helps the potential for refinements immensely.
One thing I thought I'd throw in is that I believe wing VGs could help prevent
the type of problems discussed, such as high density altitude drop outs, or
just mild sheer related drop outs.
I'm still waiting for my main springs. I gave him my final spec two weeks
ago. Will pester him bit next week I think. My spec was for 4.25" spring
travel, but preloaded 1" to leave 3.25" operational, fully used up at just over
3G. This much travel yields quite a range of wheel angle between min and
max load. I mocked up with some min and max length dummy sticks in place
of the spring members to be able to eyeball what I thought looked like the
limits of maintaining control when fully squashed, or barely touching down
with just me and a few gallons gas.
As far as my drag strut, I used 4130 for that because I felt more confident of
being able to get the bend with 4130 than with the standard MAM dual
aluminum tubes. I used a wall thickness on my 4130 that results in just a
touch over the tensile strength of standard MAM. The bends came out great.
I'm also choosing not to drill that faring hole center span of the drag strut,
although I've not completely thought out how to fare without that faring
brace.
In all of this, I won't be able to report how well it works for awhile. :/
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and type of failure helps the potential for refinements immensely.
One thing I thought I'd throw in is that I believe wing VGs could help prevent
the type of problems discussed, such as high density altitude drop outs, or
just mild sheer related drop outs.
I'm still waiting for my main springs. I gave him my final spec two weeks
ago. Will pester him bit next week I think. My spec was for 4.25" spring
travel, but preloaded 1" to leave 3.25" operational, fully used up at just over
3G. This much travel yields quite a range of wheel angle between min and
max load. I mocked up with some min and max length dummy sticks in place
of the spring members to be able to eyeball what I thought looked like the
limits of maintaining control when fully squashed, or barely touching down
with just me and a few gallons gas.
As far as my drag strut, I used 4130 for that because I felt more confident of
being able to get the bend with 4130 than with the standard MAM dual
aluminum tubes. I used a wall thickness on my 4130 that results in just a
touch over the tensile strength of standard MAM. The bends came out great.
I'm also choosing not to drill that faring hole center span of the drag strut,
although I've not completely thought out how to fare without that faring
brace.
In all of this, I won't be able to report how well it works for awhile. :/
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username "rebel" password "builder"
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List administrator: mike.davis@dcsol.com
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