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Date: Fri, 31 May 2013 13:26:45 -0400
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From: Jack Morgan <jmorgan1023@comcast.net>
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Subject: IV P flying
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This will probably stir some controversy but I think it is important to =
stay safer in a IV.

There is recent discussion about AOA and vortex generators with the IV =
and I will leave that to owners preferences. I believe the real issue =
with the IV is the rapidly increasing sink rate below 95 knots. Like all =
really high performance aircraft, slowing results in very significant =
power off sink rates well above stall. The high wing loading inherent in =
these aircraft is the reason for the speed/efficiency and the trade off =
is the sink. For pilots not used to this class of aircraft when slow, =
pulling back hoping to climb results in a very unfamiliar rapid loss of =
speed with no change in descent rate. Unless back pressure is relaxed =
quickly the remaining speed above stall dissipates very quickly. Once =
the departure comes, adding power just aggravates the spin.

The main thought is to stay above 100 knots so as to stay high enough on =
the speed curve to give a normal feel/result to the controls. The =
recommended 120 knots in the pattern and 100 knots over the fence meets =
this demand. If you have an AOA in your IV and can get it to blow the =
whistle at 95 knots I suggest you do so.

Those who would add vortex generators or an AOA so they can purposely =
operate the IV near stall are venturing into a potentially very dark =
place with little to be gained. Most aircraft in this class are =
turbines/jets and the operating manuals don't allow stalls or very slow =
flight.

Jack Morgan=