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Torque tube length

 
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larry(at)macsmachine.com
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PostPosted: Sat Apr 07, 2007 11:28 am    Post subject: Torque tube length Reply with quote

I don't remember if the torque tube was too long, but it's probably
better if you look at my picture links sent
previous, because they offer a better perspective. I think the closer
to the rear bearing, the better.
My diagonal channel was off as I recall and even with added length, it
needed to be elevated on spacers, but
this is not too much a worry because it's all an air fit for the crank
anyway.

Larry

Bill Naumuk wrote:
Quote:
Larry-
Did you find the plans torque tube length too long?
This is driving me nuts. We're talking an INCH too long to make
contact with the front bearing! I'm reluctant to cut the tube down in
order to move the stop ring back, but I can't see being off an inch in
the rest of my measurements.
My c-section uses the most Zenith kit parts of any flying surface.
The spar was prebuilt, so I couldn't screw that up and all the Z
crossmember locations are within ± 2mm of plans (Hell, they couldn't
be otherwise because they're centered on the pre-drilled bottom skin
holes)!
WHAT'S GOING ON?? Is it pure coincidence that the cattycorner
channel was 1" short? Of course, it wouldn't make any difference in
the height of the channel because the contact points are the back of
the seat pan and the rear Z spar. You'd be sitting flat on your back
if the rear of the pan were 1" rearward. Even if I were off the 10mm
on the location of the back of the seat pan that was an earlier
possibility, that would only account for about 1mm additional
clearance for the torque tube bellcrank.
Like I say, I'm about to lose it. My research/build time ratio has
increased to 5:1.
Bill Naumuk
HDS Fuse/Corvair
Townville, Pa
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naumuk(at)alltel.net
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PostPosted: Sat Apr 07, 2007 12:01 pm    Post subject: Torque tube length Reply with quote

Larry-
I see that you shimmed the hell out of the cattycorner brace and agree
that the critical thing is to keep the torque tube bellcrank centered with
the aileron bellcranks. I'll be too far forward if I change the positioning
of the stop ring.
I figure the best thing to do is continue rigging the aileron cables
(I'm now 2 for 4, because I forgot to add the cable turnbuckle ends to one
side) and shim the cattycorner brace to clear the torque tube bellcranl at
it's aft plans position.
I think I'm through the Nico Press learning curve. Hardest and most time
consuming process to date. Can't screw up here.
Don't know how anyone could build one of these things before the
internet. I'm about to buy a voice modem so we can talk realtime!
Thanks, as always.
Bill Naumuk
HDS Fuse/Corvair
Townville, Pa
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