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Three Bladed Props on IC Engines


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I just wondered if there was anything different about the "11x7" thing on 3 bladed props as they put more load on the engine.
 
I am getting a 52 four stroke for the pick a plane lysander Tony Nijhuis is designing and a lysander wouldn't look right without a three bladed prop.
 
 I have never used a prop with more than two blades so it is a first for me.
 Is there anything i need to know about it?
 
Peter
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Hi Peter,
 
You are going to get a few people saying that three-bladed props are inefficient and go on about "dirty air" and other such stuff. But as a rule, if your enging uses say, a 14x6 two-bladed prop then you should drop a size for a three-blader. I've used a few and never had any problems with them.
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