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0. 12:41 AM - The Value of a Forum... (Matt Dralle)
1. 11:37 PM - Allegro stall speeds (aerosiam)
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| Subject: | The Value of a Forum... |
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| Subject: | Allegro stall speeds |
During a biennial with a CFI, the stall characteristics were tested. The plane
is a 2006 Allegro 100 hp fitted with full span vortex generators plus VGs on the
bottom trailing edge of the horizontal stabilizer. Weight was 500 kg or 1,100
lb. OAT 30 degrees C. The VGs are from stolspeed.com and were inexpensive and
easy to install
The plane has a Dynon plus 2 ASIs fitted to 2 pitots. Both ASIs were poorly calibrated
at the factory. There were carefully re-calibrated right thru the speed
range with a manometer and are exactly in sync with the Dynon so IAS is also
CAS.
Minimum speed
42 kts at half flap. With a little power, the plane maintained altitude and could
perform gentle 10 degree turns. Aileron control was slow but positive.
Stall speeds power off (indicated and calibrated)
Zero flap - 42 kts
Half flap 15 degrees 38 kts
Full flap 48 degrees 36 kts
This confirms an approach speed with flaps at 50 kts. Touchdown speed in ground
effect is about 34 kts
Stall behaviour
At all 3 flaps settings, the behaviour was the same.
The stick is back against the stop and the plane simply parachutes at about 400
ft/min pitched about 5 degrees nose up. There is no break or wing drop.
Deliberately moving the aileron sometimes provoked a mild wing drop, sometimes
not.
Recovery is immediate as soon as back pressure is released and power applied. Height
loss is negligible.
The stall warning worked correctly. There is almost no buffet presumably because
the VGs prevent the usual separation at high angles of attack.
Difference with VGs fitted.
The slow speed and stall behaviour is very mild. There is more elevator and aileron
control bite especially for take off, flare and landing. The nose wheel can
be held off noticeably longer.
Without the VGs, typically there was a wing drop to the right.
The Allegro manual states the CAS stall speeds as 43 / 39 / 35 @ 520 kg or 1,144
lb.
Before the VGs were fitted, I noted the stall speeds as 45 / 40 / 36.
I suspect Fantasys figures are a little optimistic. What results have other owners
obtained when practising stalls?
Paul
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=358568#358568
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