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MP and fuel flow

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n395v

Joined: 10 Jan 2006
Posts: 450

Posted: Wed Feb 07, 2007 6:44 am Post subject: MP and fuel flow

I have reviewed Dennis Savarese's power chart and am still getting the feel for the engine.



Just how much oversquare can you run these things.



It just doesn't feel comfortable running 1800 RPM at high power settings. Is this a legitamate concern or just my prejudice from running direct drive opposed engines?

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Milt

dsavarese(at)elmore.rr.co
Guest

Posted: Wed Feb 07, 2007 7:52 am Post subject: MP and fuel flow

Nothing to be concerned about.   Take a look at the original Russian power 

setting chart and it clearly suggests the engine being run "over square".

Dennis



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george(at)gesoco.com
Guest

Posted: Wed Feb 07, 2007 8:43 am Post subject: MP and fuel flow

The only restrictions that I know of are the 5 minute limit on full power.

Radial engines are often run "over square". 

	The basic design allows this as they do not have the same torsionial

stresses on their single throw crank shaft. Multiple throw crankshafts set

up torsional and bending stresses on the long crankshafts on other designs.

The simple single plane cylinder arrangement also sets up different

vibration patterns that are easily counteracted with floating

counterweights. The M14P has primary vibrations in the 4.5 th order and the

ninth order that are way different from the four and six cylinder opposed

designs. The M14P has floating counterweights that effectively dampen the

vibrations. 

	As Dennis pointed out the manuals and log books show operations that

are way over square. 



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n395v

Joined: 10 Jan 2006
Posts: 450

Posted: Thu Apr 26, 2007 4:07 pm Post subject: Re: MP and fuel flow

Went to Sun and Fun last week. Departed Atlanta and flew same route and distance as did the prototype at same altitude 5500' and same power settings as the 360 HP prototype with it's pressure carb.The trip took 2.0 hrs.



Made the trip using 7 gallons less fuel consumption. This I attribute to being able to adjust mixture.



After approx 100 hrs I am able to say that:



At low altitude <10,000' I can get 175-180KTS TAS at 11.7GPH running 23" and 1950 RPM



Above 10,000' at 24" and 2000 RPM I can get 205 KTS TAS burning 14.5GPH



At 12,000' at 28" and 2700 RPM I see 225-230KTS TAS at 28-32GPH

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