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Old 04-15-2011, 01:46 PM   #1
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Newbie prop question

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Can anyone tell me what the difference between 2,3, and 4 blade props? Facts other than: because it looks scale and fast, medium, slow
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Old 04-15-2011, 02:59 PM   #2
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Re: Newbie prop question

1 - more ground clearance - ie: given the same pitch & RPM 3/4 blades can generate a certain amount of thrust in a smaller diameter than 2.

2 - can a bit quieter - prop tips not moving as fast ( see #1 )

3 - supposedly better performance - at least thats the claim for full scale - as for models - ?????

I'm sure there will be more opinion's ...
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Old 04-15-2011, 04:31 PM   #3
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Re: Newbie prop question

For most apps a 2-blade prop is the most efficient.

If you opt for a 3-blade that extra blade adds quite a bit of drag and you need to decrease diameter or pitch by one number to compensate. Can't say I have seen anyone run a 4-blade prop.

NOTE: I have had no luck with 3-blade props on 2-strokes as in most cases, even reducing as I mentioned, the extra drag prevents the motor from getting up to the peak power band. No problems with 4-strokes and I have one on my Saito 91 in the Skybolt.
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Old 04-16-2011, 10:09 AM   #4
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Re: Newbie prop question

For efficiency the 2 blade prop is best but a 3 blade prop can be useful for reducing noise (with a smaller diameter the prop tips are less likely to go supersonic - this is the 'ripping' sound that you will sometimes hear from the big gassers). In IMAC competition you get extra points for a quieter aircraft so three blade props are quite common. The three blade prop can also be really useful for getting added ground clearance. My Dynaflight Decathlon is slightly overpowered with a DA50 and the only way that I could get enough prop with the available ground clearance was to go to a 3 blade
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