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Craig,
I am sure that others can tell you the difference between ROP and LOP in
their planes. I almost never fly ROP but would guess it is about 6 knots in
my plane.
I have pretty good data about the speed losses with de-ice though having
done test flights before and after. Test flight was done at 9,000 ft., 2700
RPM, with Ram Air. Don't remember air temp but it was in the winter over
Redmond so it was fairly cold. Speed was computed by 4 way GPS ground speed
averaged.
No Deice: 247 kts
Airframe only: 244 kts
Airframe and Prop: 241 kts
Therefore I would expect about 6 kts loss of speed with the Therm-X deice
D. Brunner
N241DB 600 hours
-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Colyn
Case
Sent: Wednesday, April 03, 2013 11:23 AM
To: Lancair Mailing List
Subject: [LML] LIVP Power and Flight parameters from today's flight test.
Craig,
just noodling about my de-ice again. trying to figure out how slow I'm
going to be.
I only have ROP numbers on my plane at fl250. Trying to convert those into
LOP speed.
Do you have ROP numbers for your plane up there? In other words do you know
your ROP to LOP speed penalty?
Colyn
On Jul 24, 2012, at 7:57 AM, Craig Berland wrote:
Flight to OSH from Sedona, AZ...actually to Yankton, ND for lunch and fuel.
Sunday
ISA +35
FL 250
MP 31.9
RPM 2500
FF 17.1 gph
TAS 277 (Chelton)
Craig Berland
N7VG
Sent from my iPad
On Jul 23, 2012, at 7:31 AM, "jeffrey liegner" <liegner@ptd.net> wrote:
> Power and Flight parameters from today's flight test.
>
> Level FL240 west bound: 15*F (IAS+41F)
>
> MAP 31.5
> RPM 2400
> Fuel 17.1 gph (LOP) FP 30
> TAS 257
> LIAS 174
> High CHT 394 (#2, of course)
> Cabin Altitude 10,000' (PSID 5.0)
>
> If Fuel 18.1 gph, speed increases TAS 264 but CHT increase.
>
> http://flightaware.com/live/flight/N334P
>
> Comments? Analysis?
>
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