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Forum: Pattern aircraft

12-10-2014, 07:33 AM

Replies: 32

power system for 1978 duallist opinions?

Views: 8,890

Posted By fhhuber

For most of the reed valve gasoline engines all...

For most of the reed valve gasoline engines all you have to do is change the ignition timing. Relocate the Hall sensor and it will work. The reed valve is operated on the vacuum in the crankcase...

Forum: Pattern aircraft

12-10-2014, 06:06 AM

Replies: 32

power system for 1978 duallist opinions?

Views: 8,890

Posted By fhhuber

Reversing many (all that I know of) K& B engines...

Reversing many (all that I know of) K& B engines was accomplished by pulling the front of the case and turning it 180 deg to reverse the crank port timing. Works for any engine using the crankshaft...

Forum: Pattern aircraft

12-07-2014, 11:07 PM

Replies: 32

power system for 1978 duallist opinions?

Views: 8,890

Posted By fhhuber

A plane will fly on 30 to 50 watts/lb.... if you...

A plane will fly on 30 to 50 watts/lb.... if you have the right prop. It has to provide the thrust and pitch speed needed. The Piper J3 Cub OEM version of appx 1936 had about 35 watts/lb at rated...

Forum: Pattern aircraft

12-07-2014, 07:16 PM

Replies: 32

power system for 1978 duallist opinions?

Views: 8,890

Posted By fhhuber

You can compensate for both of the negative...

You can compensate for both of the negative issues with the thrust line. If the kit specifies normal rotation on both props and the thrust lines are set by the kit specs then you can expect that the...

Forum: Pattern aircraft

12-07-2014, 07:25 AM

Replies: 32

power system for 1978 duallist opinions?

Views: 8,890

Posted By fhhuber

2 issues with not counter-rotating: 1)...

2 issues with not counter-rotating:

1) torque turn effect, especially if applying high power at low speed.
Can be dealt with by good throttle management.

2) single engine out one side will be...

Forum: Pattern aircraft

12-06-2014, 05:12 AM

Replies: 32

power system for 1978 duallist opinions?

Views: 8,890

Posted By fhhuber

The 160 watt props sound in keeping with the...

The 160 watt props sound in keeping with the change from 2 blade to 3 blade when compared to the props expected when the plane is flown using glow. should do fine.

Forum: Pattern aircraft

12-06-2014, 01:10 AM

Replies: 32

power system for 1978 duallist opinions?

Views: 8,890

Posted By fhhuber

110 watts/lb will almost do the current AMA...

110 watts/lb will almost do the current AMA Sportsman sequence. 150 watts/lb will do intermediate and maybe advanced.

That is if the props are correct for the plane. You can put excessively...

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