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1. 11:04 PM - Re: winglets (BillLeff1@aol.com)
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Just to set the record straight. The AeroDyne winglets were not developed by
the Air Force engineers. However, the deign was evaluated by Air Force
engineers, visually not in wind tunnels, and they felt that they could probably
not be improved on in their present form. They felt that there would not be a
reasonable return on investment if additional evaluation was done.
The originals were Commander factory winglets for the 695 Jet Props. A set
of those were installed on Av Fuel's 500S (N66AV). Basically those that
followed were copies of the factory winglets. They were then modified (stretched)
to
fit the 690 wing. No flight test were conducted to certify any performance
improvement because it was too expensive.
I conducted some of the original flight test for Dick Wartinger. Most of the
flight test for certification were to make sure that there were no adverse
effects like vibration. My findings about performance were subjective but I
found that they made a significant improvement in the following areas:
Low Speed , high angle of attack operations.
The aircraft lifts off easier
Stalls are much cleaner and normally break straight ahead (stall speed my be
lower but we never certified that.
Aileron control at low speed is significantly improved so cross winds are
easier to handle especially in short wing aircraft (520 560 680s and Turbos).
Approach speeds can be lowered 5-10 kts because of better low speed
characteristics.
Single engine climb appears to be improved
It is hard to ell about normal climb
I have never noticed any increase in cruse speed.
And Oh Yea... they look way cool!!!!!!
I did buy one of the first sets to put on a 681. My employer also had a 695A
(1000) as well and it came with factory winglets.
Anyway, that is the story on the winglets.
Bill Leff
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