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Feb 10, 2020, 12:15 PM
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What size gas engine?


I have a Lanier Ultimate Pitts that needs finishing. The specs have an engine range of .91 - 2.2 two stroke. Weight 10 - 14 lbs. What would be the correct size gas motor for this plane?
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Feb 10, 2020, 07:41 PM
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exf3bguy's Avatar
10lbs, 30cc, 14lbs 40cc.
Feb 10, 2020, 08:52 PM
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Originally Posted by exf3bguy
10lbs, 30cc, 14lbs 40cc.
Thanks
Feb 11, 2020, 07:47 AM
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If you like your planes really light, a good 20cc engine will do a nice job up to 10lbs. Should have unlimited vertical. Any heavier though, and the 30cc plan might work out better.

Point being, at 10lbs, there's is no "correct" engine. It's way more about what your expectations are for the plane.
Feb 11, 2020, 09:17 PM
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If a 20cc will give it unlimited vertical then that will be plenty. Thanks
Feb 11, 2020, 09:25 PM
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Keep in mind that a bipe has considerable more drag then a monoplane. A 10lb mono with 20cc would indeed be a good performer, a bipe may be questionable. The reality is that most guys will build the Ultimate Pitts at 12lbs, Lanier kits build heavy without considerable mods. Size wise, it compares to my 9lb Reed Falcon which is powered with a YS 140DZ spinning a 16x10 three blade. The YS is on even playing field with a 30cc gasser.
Feb 12, 2020, 07:06 AM
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Don’t forget about a twin engine if you can fit it and provide cooling.
My twin doesn’t shake as much and sounds different than my singles.
A 30 or 40cc twin could be an option depending on fit,cooling and CG.
Feb 12, 2020, 07:41 AM
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Quote:
Originally Posted by exf3bguy
Keep in mind that a bipe has considerable more drag then a monoplane. A 10lb mono with 20cc would indeed be a good performer, a bipe may be questionable.
That's a good point. Not having much bipe experience, I wasn't considering the extra drag, especially when equipped with flying wires. Still likely a good combo, but unlimited vertical may be just out of touch. So it's still about your expectations. -Al
Feb 12, 2020, 06:12 PM
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All good info, thanks
Feb 16, 2020, 03:03 PM
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Quote:
Originally Posted by JPBIII
I have a Lanier Ultimate Pitts that needs finishing. The specs have an engine range of .91 - 2.2 two stroke. Weight 10 - 14 lbs. What would be the correct size gas motor for this plane?


for a 10lbs plane and 91. 2s the equivalent gas is 20cc.

and 1.8 nitro 2s upper range approx. 30cc


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