[NSRCA-discussion] SNAPS ! AGAIN !

[Keith Hoard]

Why would you let something as trivial as mathematics (or physics) get in
your way?

On Sat, Feb 27, 2010 at 8:21 PM, Ron Van Putte <vanputte at cox.net> wrote:

> Oh my!  I hope John realizes what he's stepped in here.
>
> Ron
>
> On Feb 27, 2010, at 9:36 AM, John Fuqua wrote:
>
>  A full scale friend lent me a book by Alan Cassidy entitled “Better
>> Aerobatics” which had a formula for determining how many Gs to pull to enter
>> a snap.    It is very enlightening.
>>
>>
>>
>> Formula is  =  Recommended entry speed to enter snap divided by the Power
>> ON stall speed  - Squared.
>>
>>
>>
>> His example (Pits S2A) was  105/55 =1.909  (1.909)2  =3.64 Gs.    This
>> means you would try to have an  instantaneous 3.64 G loading if entering the
>> “flick roll” at 105 mph.
>>
>>
>>
>> What I find fascinating about the formula is the “power on stall” part of
>> the formula.   Now translate that into our models which have NO power ON
>> stall speed.   I think this means that mathematically we cannot do a snap.
>> Or the instantaneous Gs required are impossible to obtain.
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>>
>
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-- 

Keith Hoard
Collierville, TN
khoard at gmail.com
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