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Real World M7 Cruise Speeds
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Isaac



Joined: 20 Mar 2010
Posts: 59
Location: Bethel, Ak

PostPosted: Sat Oct 12, 2019 7:17 am    Post subject: Reply with quote

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
100+ Posts


Joined: 26 Nov 2010
Posts: 675
Location: Dallas, TX

PostPosted: Sat Oct 12, 2019 9:41 am    Post subject: Reply with quote

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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Joined: 12 Feb 2014
Posts: 106
Location: Wisconsin

PostPosted: Sun Oct 13, 2019 6:19 pm    Post subject: Reply with quote

Andy Young wrote:
Undaunted wrote:
M7-235C on 31" cruise at 118 kts


118 knots, not mph!?

That’s quite impressive on 31”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.
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Andy Young
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Joined: 05 Oct 2011
Posts: 1096
Location: Alaska, Antarctica, Colorado, and Others

PostPosted: Mon Oct 14, 2019 5:10 am    Post subject: Reply with quote

Undaunted wrote:
Andy Young wrote:
Undaunted wrote:
M7-235C on 31" cruise at 118 kts


118 knots, not mph!?

That’s quite impressive on 31”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



Joined: 26 Sep 2006
Posts: 56
Location: Spring, Texas

PostPosted: Mon Oct 14, 2019 11:12 am    Post subject: Reply with quote

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
100+ Posts


Joined: 23 Sep 2015
Posts: 280
Location: New Mexico

PostPosted: Mon Oct 14, 2019 12:26 pm    Post subject: Reply with quote

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.
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Previous and future Maule owner slumming it in a 180!
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Andy Young
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Joined: 05 Oct 2011
Posts: 1096
Location: Alaska, Antarctica, Colorado, and Others

PostPosted: Mon Oct 14, 2019 1:18 pm    Post subject: Reply with quote

Oh right; spring gear. I missed that it was a”C”.
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