I have what I consider to be good data on the speed reduction related to
Therm-X

Mine was the first Legacy installation and the plane was flown both before
and after installation of Therm-X.

Speed trials were done at 8500 ft over Central Oregon.  I flew a 360, 90,
180 and 270 heading for long enough for the GPS ground speed to stabilize.
Don't remember OAT. I flew it "balls to the wall" at 2700 RPM, full
throttle, ram air open, and about 100 deg ROP (max power mixture)

No de-ice 247 ktas
Wing and h-stab de-ice 244 ktas
Wing, h-stab and prop 241 ktas

So in essence, at top speed airframe de-ice costs you 3 knots and prop
de-ice another 3 knots for a total of 6 knots.  At lower speeds it probably
cost less.

D. Brunner
N241DB

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Pierre
Sent: Sunday, October 03, 2010 7:46 PM
To: lml@lancaironline.net
Subject: [LML] Re: Therma-X Deicing system

I understand that there are three Legacys using the Therm-X de-ice system.
Is there any good data on any speed reduction that this equipment causes?
Any of the three have a supercharger from  FAT or Aero Superchargers?
thanks,
-pierre

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