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Old 08-29-2022, 04:56 PM
RV7A Flyer's Avatar
RV7A Flyer RV7A Flyer is offline
Join Date: Jul 2013
Location: US
Posts: 2,877

RV-7A, IO-360-M1B, injected, Hartzell BA prop. 170 KTAS in the 7000-9000 MSL range, leaned to best power.

OP needs to make sure his ASI is accurate before doing anything else.
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Old 08-29-2022, 07:04 PM
cef737 cef737 is offline
Join Date: Feb 2022
Location: Logandale, NV
Posts: 5

The engine is new and still being broke in. I have no wheel pants or gear fairings yet. The ASI seems to be accurate as I have checked the GPS ground speed
to my TAS. The engine is making good power MP 28Ē but RPM on takeoff is only 2650. I need to adjust that. Fuel burn is around 15gph at WOT and 2600rpm full rich at 3000-4000msl. Probably 7000DA The airplane also rolls to the right significantly. Iíve double checked A of I and sweep and they check good. My right wing had been painted but nothing else. I took this project over at 90%.
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Old 08-29-2022, 07:14 PM
BobTurner BobTurner is offline
Join Date: Dec 2011
Location: Livermore, CA
Posts: 8,696

Gear and wheel fairings really work. Without them youíll lose of order 10 knots.
Search for Ďheavy wingí. Check the vertical height of the two ailerons, they need to be exactly the same. Then move on to slight adjustments (Ďpinchingí) of the trailing edge.
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Old 08-29-2022, 07:19 PM
agent4573 agent4573 is offline
Join Date: Aug 2019
Location: Mountain view
Posts: 685

That's doesn't seem too far off if you don't have any fairings installed. The wheel pants and fairings should be good for around 10 knots, and 145 indicated at 3000 ft is equivalent to 170 true at 9k.
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Old 08-29-2022, 11:19 PM
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Untainted123 Untainted123 is offline
Join Date: Jan 2021
Location: Azle, TX
Posts: 216

I went and did speed runs this afternoon, plugged them into the kitplanes spreadsheet, I have a calculated IAS correction of +3.9, so thatís part of the answer.

But I discovered something else doing research on MAP gauge calibration. Reading this thread here, I calculated that my MAP gauge should be reading 28.95 with the engine off. Turns out itís reading a hair past 30.00 with the engine off, so I have been thinking I have been flying around at ~65% power, instead it been closer to 58-60%.

So OP, double check your manifold pressure is reading correctly, and from several other posts, just cause itís electronic sensor or EFIS doesnít mean itís any more accurate or calibrated than a mechanical one.
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