View Full Version : 48" Prop on 72HP MAC?
10-03-2006, 01:23 AM
I purchased my B8M with a 72HP MAC with a Motorcraft Carb and it has a 48" wooden Prop is this enough blade to haul my 215lb ass around using 23'DW blades.
John in the 'Burgh
10-03-2006, 01:32 AM
My instructor weight the same and he use 50-30 . 50 inches 30 pitch and he fly at 60mph. 48 is too short. Now some people is the state like 50-28. more RPM for take off. but run a bit high on crussing.
bottom line need new prop.
10-03-2006, 01:41 AM
Any suggestions on the MAX size prop for a 72MAC so I can get an idea on how much raise the motor mount. Which unfortunately is going to raise the thrust line.
10-03-2006, 03:46 AM
max size on standard b8m is 52inch most used 50 inch prop. dragon wings give u more clearance between blades and prop.be careful not to let blades flap if u go with 52inch
10-03-2006, 05:07 AM
John, The motor mount that you have was the latest design that Bensen sold. Do not change it`s location or height. You should be able to use a 52" prop . I use a 52 X 26 Tennessee on my 90 HP machine with the same mount. Tennessee will recommend a 52 X 24 for the 72 HP.
10-03-2006, 06:42 AM
I agree with Rick.
52 x 24 Tennessee Prop for a 72 Mac.
10-03-2006, 04:33 PM
My KB-2 has a 46x30 with a 72 hp mac. I don't have enough flying experience with it yet to give any performance numbers.
10-03-2006, 08:32 PM
Mine is 50 / 24 Tenn.
I have no complaints but I would like my cruise a bit lower rpm. It runs about 3000 and 42 to 45 mph. Climbs well at 3300. I weight 230 , empty.
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