You had a full carbon Pike. Phil had one of the ligther ones. The
problem is the layup on the really light ones just isn't suited to a
zoom in the wind.
Marta Zavala wrote:
Ive hit my F3J full carbon Pike very hard in a breeze during launch and
have yet to experience any control surface flutter. I dont go really deep
"into the bucket" on zoom though, especially in wind. Not because of
the wing flutter issue Phil experienced, but because it seems to me a
short quick zoom/ping off the line always results in higher launches for
me. Ride that zoom deep into the bucket and perhaps youve lost much of
that stored line energy? Plus you may just flutter your wing off. Just
my stupid opinion.
Walter
----- Original Message ----- From: "Phil Barnes"
<[EMAIL PROTECTED]>
To: "Soaring Exchange" <soaring@airage.com>
Sent: Wednesday, December 28, 2005 6:03 AM
Subject: Re: [RCSE] What are you doing to kill 5125/168 servos?
----- Original Message ----- From: "Tom Watson" <[EMAIL PROTECTED]>
what are you guys doing to kill the flat wing servos?
Ford Long shaft winch, strong winch battery, short (<600ft?) 240 lb
test braided winch line, no retriever, bit of a breeze. All of that in
combination with an agressive (even abusive), unpracticed launch style
that generally involved diving too deeply on the zoom and most
importantly a model with very heavy ailerons that had a strong
tendency to flutter.
Just ask anybody that attended last June's LISF (Long Island Silent
Flyers) contest. They will tell you what a Pike Superior SL sounds
like when the ailerons are fluttering so violently that the entire
wing is twisting to very odd angles. This happened repeatedly even
after switching to DS368 servos. The HS5125s stripped on the first
launch. The DS368s survived a few of those launches although the
lighter servo arms did not survive, the servo mounts did not survive
and finally, after going beefy on the servo arms and on the servo
mountings, the control horns in the ailerons ripped out. I kept trying
to beef up the aileron servos and mountings because I was stuck on
Long island with only the Pike to fly and it was my mind-set that
molded models were "buy and fly" and the Pike was an F3J model that
should be able to handle any launch you can give it.
It isn't pulling hard on launch that strips the gears. With the Pike
Superior SL it is the going really fast that does the trick. The
biggest problem on that particular model seamed to be that the
ailerons were really heavy which is bad from a flutter perspective.
David Hobby (current F3J world champion and Pike flyer) suggested
using longer horns on the ailerons. I never tried that since I sold
the model first.
Phil
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