[NSRCA-discussion] Snap (lesson learned)

[Ken Thompson]

You and me both John.


----- Original Message ----- 
From: "John Pavlick" <jpavlick at idseng.com>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, July 04, 2006 1:27 PM
Subject: Re: [NSRCA-discussion] Snap (lesson learned)


> 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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