John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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 Posted: Mon Apr 09, 2007 6:23 am Post subject: Attachment Bolts/ Not BRS |
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| That one Does have a lot of stress on it.
| Lar.
Larry:
Hardware on Kolb aircraft is well "overbuilt", as are most other
components.
Biggest problem is not failure of the hardware but wear and hole
enlargement from vibration. If you put hours on one, it is going to
elongate the holes and wear the cadmium plating off the bolts or
clevis pins, if you are still using clevis pins.
Even with enlarging holes, there is still no danger of failure, if you
can live with the clunk, clunk feel and sound when the aircraft goes
from positive to negative and back to positive G's.
I learned this very early on with the Ultrastar. Our fix on the
Firestar and mkIII was to drill out the lift strut fittings and weld
bushing stock cut to fit the slots between the attachment tangs. This
puts an end to wear from vibration and movement on the bolts.
Now, as far as bolts breaking and shearing, don't think anyone can
load one up with a Kolb to do that. The bolt is going to bend before
it breaks or shears. There is no way of loading it up that much.
The only bolts I have ever sheared on my airplanes were two 3/16"
bolts I had securing the 3/4" axles to the axle sockets. This
happened during testing after I installed upgraded MATCO brakes.
First time I got down on the brakes to the point of locking them up, I
sheared two of the little 3/16" bolts on one axle. Fix was to go to
the next size, 1/4". No more problem. The test indicated I was
getting a lot more braking with the new brakes than with the old ones.
Take care,
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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