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Chester H. Long
New member
Username: rustyherman
Post Number: 2
Registered: 05-2013
| | Posted on Sunday, December 15, 2013 - 08:50 pm: | 
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I am building a 16 FT, flat bottom,wood plank, hard chine boat. I have a Gray ,model U, three HP, two cycle, marine engine I will install in it. I have a clutch to put between the engine and the prop shaft. My three blade 13 x 13 LH prop has a front taper diameter of 1.125 and a rear taper diameter of 1.000. If I put the engine in the center of the boat, the prop may be in the area of six FT or less (not designed yet). What would be a minimum and reasonable shaft diameter? |
J.B. Castagnos
Senior Member
Username: jb_castagnos
Post Number: 854
Registered: 07-2002
| | Posted on Sunday, December 15, 2013 - 09:01 pm: |
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We use 1", usually close to 6' in our boats. You can get a 1 1/8 to 1" bushing from prop shops, the nylon material works fine. The first prop I had for my boat was 1 1/8, I welded the shaft and machined the taper, before I knew the bushings were available. |
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