I'M BUILDING AN 11 HP HONDA MAD MUD MOTOR, ANY SUGGESTIONS ON A GOOD ALL-AROUND SIZE PROP? 14X36 SEMI-V GRUMMAN BOAT WITH PODS ALMOST COMPLETE.

Well tell you after you turn off the caps lock

Alright, the caps lock is off.

7X4 or 8X4 for 11 hp

Have any idea which is faster?

I'm assuming the 8x4.

The motor was given to me so that's what I have to go with. I'm also building pods for the back. Just have to finish welding them up.

Are you building a long tail or a surface drive? That will determine what size prop you use.

Longtail. Almost complete. I'm hoping the pods I designed and cut out will help. I based them off of Beavertails' pods. Well just see. I know longtails aren't fast, but here in Arkansas we dont deal with mud much. Mainly stumps, debris under the surface and logs in the flooded timber.

8x4 will be mint for that setup

X2 the 8x4 will work great.

sftull, what makes you think my boat won't plane out. Just curious. Ive delt with outboards for as long as I can remember. Still a little green with the mud motors, but loving it. My project has rubbed off on my father in law. Now were talking about building him one.

11 hp in mudmotor isn't equal to 11 hp in outboard.

I had a 13 with a 1442 and it was a great one man rig, but add a second man and some decoys and it fell on it's face

Ill have to remember that. What hp engine would you recommend?

If you want speed, then build a surface drive.

How wide is your hull?

A 13 hp is the biggest single cylinder, after that there is a 14 hp briggs v-twin but if you decide to go with a v-twin get the 23 Briggs (same weight as 14)

My hull is 36". Maybe ill finish this one and build a bigger one. Thanks for the info.

Modern outboards rate hp at prop - your engine is rated at the shaft
outboards are in-line thrust with the hull - longtails are angled thrust
Johnson 9.9 may run a 10in. pitch prop - you are looking at a 4in. pitch prop.
Every revolution would theoretically move the prop 10 inches forward versus the 4 inches - that gives the outboard more than twice the distance covered for the same rpms
Outboards = fast in clean water
Longtails = torque advantage in soup

Your hull will have to achieve a certain speed under different loads to "plane". You can only go so fast with a 4in prop, but you will go with confidence.