Vince Frazier
Joined: 10 Jan 2006
Posts: 132
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 Posted: Sun Oct 05, 2008 5:35 am Post subject: tailwheel spring |
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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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Vince Frazier
3965 Caborn Road
Mount Vernon, IN 47620
812-464-1839 work
812-985-7309 home
F-1H Rocket, N540VF
http://vincesrocket.com/ |
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