F3A - snap roll query

[Martin X. Moleski, SJ]

--On Wednesday, November 05, 2003 2:10 PM -0600 Don Ramsey <donramsey at cox-internet.com> wrote:

>   1.. Since the maneuver is defined as a stall maneuver (initiated by a
> rapid stall of the wing induced by a change in pitch attitude), the nose of
> the fuselage should show a definite break from the flight path in the
> direction of the snap (positive or negative) while the track closely
> maintains the flight path.

There is what I object to.

"The wing" has got two halves.

In a snap, one wing is in a stalled condition.
The lift still exerted on the other wing causes
the swift gyration associated with the snap.

I believe it is wrong to think that BOTH wings
have to stall first, causing the nose to pitch
down ("definite break from the flight path
in the direction of the snap") as in a classic
stall.

> A snap that does not show a break and stall to initiate the
> snap, but does enter a stalled attitude during the maneuver is severely
> downgraded.

The it is two maneuvers: a classic stall (both wings) followed
by a snap (one wing still lifting).

> As the wing of the model is stalled during this maneuver a significant
> decrease in speed may occur and is not a cause for downgrade.

There's that "the wing" thinking again.  I think
the proper description would be that "one wing
of the model is stalled."

Just my opinion.  I've been wrong before and I
guess I'll be wrong again.

						Marty #2874


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