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I do have the same number between ROP/LOP. But for me taking off the
de-ice had a larger effect. I got at least 12 kts or better extra speed. I
used to cruise 240 (full fuel, 2 250lbs persons and luggage) and 247 (with
1/3 tanks) @ 17500 LOP.
Now I am cruising LOP 254-256kts with the same configuration. Making me
very happy as my plane is called 'a heavy IV-p bird lol
And if you can count 2-3kts/1000ft that would make it flying
270kts/level250 :)~ (MP 31.5, FF=19, 2500rpm, >80 degrees LOP)
-- Ronald (>260hours and counting)
On 4/3/13 7:47 PM, "Craig Berland" <cberland@systems3.net> wrote:
>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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