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Posted

Quote: fantom

At 100 ROP and 2500 PRM, maybe 22 MP, and 8000 ft, I easily see at least 162 KTAS.

At 20 LOP, with the same set up, I'm at about 154 KTAS.

Posted

My 66 C model with literally every speed mod reliably does 150kt at ~5000ft, 2500rpm, full throttle, 100 rich of peak, and 145kt at the 10k I prefer to fly. Wish I could fly it LOP, at 5k I'm sucking down 11 or so gallons an hour.

  • 4 months later...
Posted

Thats what ours does on a cool day at sea level WFO.  187 MPH IAS

Quote: Immelman

Another E model data point: If I want to run it fast, full throttle, 100 ROP, 2500RPM (yes, that is turned down a bit) at 7000-10,000 density altitude I can squeak out 150kts. No doubt the hangar rash my ailerons have, the little extra bit the LMG hangs down (versus where it should be), antennas, etc rob precious speed.

I have found that 145kt is a more honest number for my airplane and use that for planning. If I am flying higher up, in the low to mid teens, that will drop off to 140kt or so (but the gas mileage is better)

Flat-out speed is something else entirely. Just for kicks I've leveled off on a cold day near sea level at about 1,000' and kept the throttle wide open... the airspeed slowly built to close to redline (185mph indicated). Does this mean the E is a 160-knot cruising machine? Not mine... that's just something to make me feel good; pushing the engine that hard and burning 17-18gph is only fun for a few minutes :)

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