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Prop question

Old 01-01-2007, 10:01 PM
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cotman
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Default Prop question

Have a 75 engine and it calls for a 12x6 or 13x6 prop. Is there a difference if I use a 3 bladed prop..... mostly for looks more then anything. Thanks
Old 01-01-2007, 10:26 PM
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masonman
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Default RE: Prop question

Depends on what kinda plane its going to go on.
Old 01-01-2007, 10:35 PM
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cotman
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Default RE: Prop question

going on a Seamaster ....60 size
Old 01-01-2007, 10:36 PM
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LANNYBOB
 
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Default RE: Prop question

the difference will be that a much smaller prop is required because of the three blades and speed will be issue. nothing too drastic. i like the looks of a three prop. decide on what size you need and get one.
Old 01-01-2007, 11:18 PM
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masonman
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Default RE: Prop question

Not sure what a seamaster is, but if it floats , you will like the added toruqe of the three blade prop, not going to be a speedster, an it looks great
Old 01-02-2007, 01:35 AM
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bkrfrmhell
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Default RE: Prop question

Soo...how do you decide on the size? I have never seen a 3 blade prop chart. Some say 1 inch less pitch or diameter than the 2 blade you would use....do apc's and graupners act the same?? A bit of direction would be nice...spending $100 on a bunch of props for testing is a little expensive and time consuming...
Old 01-02-2007, 03:23 AM
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2slow2matter
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Default RE: Prop question

On the back of MAS three blade packages, they recommend down one inch in diameter, and up one inch in pitch. Seems contrary to popular recommendation, but it usually works out pretty good for me.
APC are good props. I haven't used graupner, but I have one sitting around waiting to be used. Guess I should put it on something and see what it's all about.

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