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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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