Real World M7 Cruise Speeds

Trigear? Taildragger? Fixed pitch prop? Which Engine? ...anything related with model selection considerations and questions about buying a Maule
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Isaac
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Post by Isaac »

I run at 130mph on 35 inch tires and 15 gph fuel burn. 120 at 12.8 gph. M7-235 IO-540 and MT 2 blade prop. I am 10 mph faster on 31 inch tires at high power settings- less of a difference at low power settings.

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Mog
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Post by Mog »

Guessing your airframe is pretty tight and clean on the outside? I know I loose a lot of airspeed from my doors being poorly fitted (read worn out). I also suspect if I put some fairings back on etc I would gain a reasonable amount of airspeed back.

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Undaunted
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Post by Undaunted »

Andy Young wrote:
Undaunted wrote:M7-235C on 31" cruise at 118 kts
118 knots, not mph!?

That’s quite impressive on 31â€￾s! What are your power settings at that speed?
24 squared. Burning 12.6 gph

With 850s usually 130kts same power setting.
Trading fuel for speed when traveling.
It is VERY sensitive to trim. Takes a little bit to get it trimmed perfect but is definitely reflected with speed.
1999 M7-235C

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Andy Young
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Post by Andy Young »

Undaunted wrote:
Andy Young wrote:
Undaunted wrote:M7-235C on 31" cruise at 118 kts
118 knots, not mph!?

That’s quite impressive on 31â€￾s! What are your power settings at that speed?
24 squared. Burning 12.6 gph

With 850s usually 130kts same power setting.
Trading fuel for speed when traveling.
It is VERY sensitive to trim. Takes a little bit to get it trimmed perfect but is definitely reflected with speed.
Ah, I see. 24 squared vs. my 22 squared.

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beaver
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Post by beaver »

M7-260C, 31" bushwheels, babybush tailwheel, 24", 2400-2450 RPM, 13.1 GPH, 118-120 knots true up to about 3000ft, might get 3-4 knots more 5000-7000ft.

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TxAgfisher
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Post by TxAgfisher »

beaver wrote:M7-260C, 31" bushwheels, babybush tailwheel, 24", 2400-2450 RPM, 13.1 GPH, 118-120 knots true up to about 3000ft, might get 3-4 knots more 5000-7000ft.
That's pretty good. It looks like the spring gear models are quite a bit faster just don't think I could do it.
TJ Van Matre

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Andy Young
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Post by Andy Young »

Oh right; spring gear. I missed that it was aâ€￾Câ€￾.

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