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singleberry(at)hotmail.co
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 Posted: Fri Aug 18, 2006 12:05 pm Post subject: Tailwheel issues |
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Attn Scott, (et al)
I noticed you had a mention of a tailwheel issue, please forgive me if I am
telling you something you already know. (I probably learned it off of a
link on your site, lol)
Quote:
I had a tail issue from a severe shimmy on my second landing. I
then put a "real"
(i.e. real expensive) tail wheel on and went back to the original
MAM stinger with a steel rod inside and have had no issues since. Of
course many variables so don't know the exact cause but I believe a
combination of too flexible stinger and a poorly machined tail wheel (it
was the "large" tail wheel from MAM that is really an Elite nose
wheel).
End Quote
I do know that the castor angle of the tailwheel pivot must be positive (ie
leading with the lower side of the tailwheel spindle, at least I think this
is considered positive) This seems counter-intuitive from a static
standpoint, but for dynamic stability it is very important.
A Murphy Moose builder had a wonderful write-up on this issue of which I now
can not locate but could re-create if anyone wanted.
Cheers all
Jake
(Wishing I had a moose to build)
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singleberry(at)hotmail.co
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| Posted: Fri Aug 18, 2006 12:15 pm Post subject: Tailwheel issues |
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Of course the second I send that I find the link I was looking for, it is
off of Ted Waltman's web site, and redirects you to the following article
http://www.pierceaero.net/tws.php
cheers
Jake
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ScottA
Joined: 05 Jan 2006
Posts: 100
Location: Park City, UT
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| Posted: Fri Aug 18, 2006 7:45 pm Post subject: Re: Tailwheel issues |
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Thanks Jake,
I do agree with that article on tail wheel angles. It gets confusing because everybody has a different idea of what is "positive" and what is "negative" castor angle. There is a link at the bottom of that article showing "good" and "bad" geometry. I agree with it as do all the high time TW guys I talked too - but you find just as many that don't agree.
Flat is ideal but you don't want to start flat because as you load you will go negative angle (which many think is "good" - I do not). Also the angle is only part of the shimmy story the tightness ("preload" is what XP calls it) of the tail wheel swivel makes a big difference - especially on the large tail wheels and needs to be tightened periodically.
FWIW
Scott
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