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1. 06:35 AM - tailwheel spring (Frazier, Vincent A)
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| Subject: | tailwheel spring |
SNIP What about the bolt that goes through the fuse weldment and holds
the
tailwheel spring on? I dont know about the F-1 but my HR II just has one
AN bolt.
This bolt gets the same twisting forces as the bolt(s) securing the
tailwheel.
I think I will put a high strength bolt in there too.
Kevin Shannon SNIP
Kevin and others,
Here's a snippet from one of my webpages
http://www.vincesrocket.com/landing%20gear%20and%20related%20stuff.htm
that details the tapered pin approach to use to retain the spring in the
fuselage weldment. It's from Bob Japundza originally.
Vince
I want to pass on a little tidbit here about the bolt that holds the
tailwheel spring to the tailwheel weldment. I drilled mine per Mark's
instructions and found that the bolt went in too easily--this should be
an interference fit (once again, my savior the "big-ass" hammer should
be used to put the bolt in). I wrapped a piece of scrap aluminum around
the tailwheel spring and could twist it with a pair of vise-grips. Not
good! If there's any play here, the bolt can eventually fail or the hole
will become elongated. I have heard of failures in these bolts on RV's .
Rather than taking my chances with a larger bolt and it too not being
correct, I decided to fix it with a taper pin which worked out very
well. Here's the recipe:
AN386-2-9A taper pin (aircraft spruce)
AN975-3 taper pin washer (aircraft spruce)
B&S #2 taper pin reamer
(http://www.mscdirect.com/MSCCatLookup2.process?MSCProdID=02054021)
(1/2 the price of AC$)
12" long tap handle
(http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=45206
)
The taper pin has the advantage that if the pin ever loosens up, you can
just tighten up the nut and things should be snug again. The taper pin
is an odd-sized Browne & Sharpe #2 taper, so don't confuse it with other
-2 tapers.
I highly advise that the final hole size should be reamed with a
hand-reamer .001-.002 under-size even if you don't use a taper-pin.
There are too many variables with drilling to final size with a hand
drill. Bob Japundza
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