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Date: Wed, 29 Jun 2011 13:14:44 -0400
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Subject: Re: [LML] Fin
From: John Hafen <j.hafen@comcast.net>
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Giff:

Good moves all.

Additionally, I think in the early days, guys didn't consciously realize =
how much AOA increases with bank angle.  Flying square corners in a =
pattern, especially in the base to final turn, can stall the plane way =
too close to the ground to do anything about it.

That is why HPAT recommends flying a 1500 foot pattern, and a roundish =
arc from down wind to final, rather than square corners from down wind =
to base, then base to final.

John Hafen


On Jun 29, 2011, at 8:26 AM, Giffen Marr wrote:

Before I started to build my IV-P, I reviewed the accident history of =
the IV.What I found was a significant number of stall spin accidents in =
the IV. Why a higher rate then other aircraft? =46rom my analysis, I =
felt there were two reasons, one,the aircraft tended to have an aft CG, =
and two, the tail became blanketed in the spin, causing difficulty in =
recovery. My un-flown solution was to move as much weight forward as I =
could, add stall strips, add the ventral fin and add about 48 square =
inches of area to the rudder trailing edge. You must also remember that =
when you retract the gear, the cg moves aft about 2 inches. With an aft =
CG, the aircraft will tend to go flat in the spin, which makes recovery =
difficult.

Giff Marr
N229GM
1st engine run before AirVenture.
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