48" Prop on 72HP MAC?

[B8MFlorida]

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

[Caribean_gyro]

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.
chuckP

[B8MFlorida]

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.

[GYRO J]

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

[Rick Whittridge]

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.

[gyromike]

John,

I agree with Rick.
52 x 24 Tennessee Prop for a 72 Mac.

[Timchick]

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.

[Friendly]

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.