I pickup about 8 kts when running ROP. I pickup about 3 kts per thousand feet increase in altitude. The "air" can change the TAS 10-15 kts pretty easy, so getting good test data is difficult. I ran some tests back to back ROP and then LOP at a variety of altitudes. 8 kts is a decent rule of thumb.
Craig

Sent from my iPad

On Apr 3, 2013, at 8:24 AM, "Colyn Case" <colyncase@earthlink.net> wrote:

> 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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