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3 blade vs 2 blade prop

Old 02-23-2009, 07:06 PM
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ekim1940
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Default 3 blade vs 2 blade prop

CAN SOME ADVISE ME ABOUT A 3 BLADE PROP I AM TURNING A 10/6 2 BLADE PROP ON MY MOTOR AND WOULD LIKE TO GO TO A 3 BLADE DO I GO SMALLER IN SIZE ??
Old 02-23-2009, 11:30 PM
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DaveFlynn
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Default RE: 3 blade vs 2 blade prop

Have you tried the Master Airscrew 9x7 3-blade?
Old 02-24-2009, 11:49 AM
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onewasp
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Default RE: 3 blade vs 2 blade prop


ORIGINAL: DaveFlynn

Have you tried the Master Airscrew 9x7 3-blade?
Dropping an inch in diameter and raising it an inch in pitch seems to mean that the load has increased___right? The times 3 factor.
Old 02-24-2009, 12:57 PM
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ekim1940
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Default RE: 3 blade vs 2 blade prop

thank you for the info i will try it
Old 02-25-2009, 09:26 AM
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Default RE: 3 blade vs 2 blade prop

Roughly speaking, the 3-blade prop should either be 1 inch less in diameter OR 1 inch less in pitch to be equivalent to a 2-blade. Bear in mind that a 3-blade prop will always put more 'load' on the engine than a 2-blade....simply because there's more mass. In the real world though, that doesn't necessarily mean anything. Sometimes a 3-blad will pull better than an equivalent 2-blade, sometimes not. There are so many variables, such as the engine itself, the airframe, etc. etc. etc. Very generally speaking, the more 'torquey' your engine is the better it will respond to a 3-blade and other higher-load props. If your engine is the revver type you'll want to stick with a 2-blade .

As an example, I've always had less thrust with a 3-blade on my 1/2A engines...but my OS 4-stroker (a .91) loves a 3-blade and really pulls with it. In the final analysis, the only real reason to use anything aside from a 2-blade for a flying prop is if you have ground-clearance issues. 3- and 4-blade props definitely look more scale, but that look disappears when your engine is actually running
Old 02-25-2009, 09:30 AM
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ekim1940
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Default RE: 3 blade vs 2 blade prop

thank you this is the answer i was looking for
mike

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