[NSRCA-discussion] Snap (lesson learned)

[John Pavlick]

Yes, further examination revealed that not all of the fuel in the tank was
evenly displaced throughout it's interior at the moment that the auto
rotation occured. This was most likely due to the fact that the airplane
suddenly decelerated while achieving the perfect pitch-break. Therefore,
there was a slight bias to one side of the tank. Even though the auto
rotation occurred precisely around the C.G., the tank was torn loose due to
the asymmetrical forces invloved. In fact, if you're not ripping the tank
out of your airplane, you're probably not performing a "real" snap. <LOL>
(I'm kidding of course) I wish I could have seen that one Mike!

John Pavlick
http://www.idseng.com


> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Mike Hester
> Sent: Tuesday, July 04, 2006 12:16 PM
> To: NSRCA Mailing List
> Subject: Re: [NSRCA-discussion] Snap (lesson learned)
>
>
> Just because it's located around the lateral CG, doesn't mean
> it's centered
> on every other axis. You'd be suprised what that many Gs will do.
> You would
> have to have been there....LOL
>
> -Mike
>
> ----- Original Message -----
> From: "Jay Marshall" <lightfoot at sc.rr.com>
> To: "'NSRCA Mailing List'" <nsrca-discussion at lists.nsrca.org>
> Sent: Tuesday, July 04, 2006 12:06 PM
> Subject: Re: [NSRCA-discussion] Snap (lesson learned)
>
>
> > But if the tank is on the CG, and the snap is around the CG..........?
> >
> > -----Original Message-----
> > From: nsrca-discussion-bounces at lists.nsrca.org
> > [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
> Mike Hester
> > Sent: Tuesday, July 04, 2006 11:00 AM
> > To: NSRCA Mailing List
> > Subject: Re: [NSRCA-discussion] Snap (lesson learned)
> >
> >
> >> 4. "Burying the Snap" by over controlling will eventually put you in a
> >> situation that will score poorly.
> >>
> >
> > And if it's a negative snap, as I found out the hard way, you may break
> > something loose.
> >
> > I had my plane snapping hard...and I mean HARD. I kept shaking my head,
> > but
> > everyone around me kept saying "NO don't tone it down, it looks awesome
> > and
> > you won't zero it, leave it alone!" LOL (It did always come out
> on heading
> > and wings level, it was just evil looking).
> >
> > So, I had a really good round going, and "went for it".....as
> in, went in
> > too fast, and buried the controls. I'll say this: there was no
> denying it
> > was a snap. But that loud "crack" could be heard in the next
> county. That
> > plane went from about 70 mph to oh.....3 or 4....LOL....almost
> instantly.
> > Like a 45 degree down warp speed blender. If some snaps have
> been checked
> > at
> >
> > 14 Gs, this one was over 20. EASY.
> >
> > Needless to say it over rotated, and as I came out of it, I
> wondered what
> > was going to fall off. It felt wierd and the next couple manuevers went
> > fine. Then I dead sticked and had to abort the flight.
> >
> > Tank broke loose, cutting both lines and filling the nose of the plane
> > with
> > at LEAST 8 ounces of fuel. Nothing structural except a couple
> of very tiny
> > cracks in the canopy (love those carbon canopies!) So I drained
> my plane,
> > set it in the sun, put it all back together and flew the rest of the
> > rounds.....with a far more tame version of the snap.
> >
> > So, I learned my lesson. I'll satisfy the judges to an extent,
> and beyond
> > that, a snap is a snap and every judge should know what one looks like,
> > you
> > shouldn't have to break your plane to do it. Luckily all I lost was some
> > rubber bands and few ounces of fuel. At least I got more than a
> few jokes
> > about it =)
> >
> > -Mike
> >
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> >
> >
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