Propeller 1956 30 hp

[billy-t]

hey fellows

Quick question, i just picked up a 1956 30 johnson that is missing the prop, otherwise pretty complete. i believe i have a prop off a 1957 35 hp would that work? if not what should i be looking for?

Thanks

[garry-in-michigan]

The 25 & 30 horse motors (1951 through 1956) used a 10-3/8" diameter by 12-½" pitch propeller. The 35 horse motors (1957 – 1959) used a 10-⅜" by 13-¼" prop. You might got away with the higher pitch on a small hydroplane, but not on fiberglass runabout. The 30 horse thrives on high RPM. The higher pitch would not let it turn up to it’s full horse power.

. . . . . . 😉

[beerman57]

3/4" pitch difference isn’t going to make much difference if the motor is on a light boat, more pitch better on a light boat. On a heavy boat, less pitch.

[chinewalker]

Of course, this is all guesswork, as none of us know what prop you have. Just because the 35 may have been shipped with such and such prop 60 years ago doesn’t mean that’s what is there now. Numbers from the prop hub would help, but in a word, it will fit. Is it correct? Depends on what you’re running it on.

[Randy in Tampa]

I would just put it on and try it, I’m constantly changing props on motors to see which one works best and that one might work best for you, I would put it on and see and if it lugs it’s too much pitch…. 😉

[olcah]

Interesting question! I plan to run a 1956 Johnson 30 HP on a 12 ft. Crestliner Commander aluminum boat with front steering. Boat weight is about 160 lb. + motor, tank, and me. Will a standard propeller over rev the motor? Would a 13 or 14 pitch be better? Thank you.

[billy-t]

Thanks for all the thoughts. good point on part number on the propeller I have, will dig it out and have a look.

Thinking that I would be running it on a deep 14 mirrocraft, or a heavier 16 starcraft.

I appreciate the comments, will dig out the prop and have a look and advise what I find.

Thanks again fellows.

woke up to 3 inches of new snow in southern Ontario, might be a few days before i hit the water, still too hard!

[chinewalker]

OLCAH – honestly, you won’t know until you try it. It’s a small boat, lightweight. The higher pitch may be better. The BEST way is get as many props as you can get your hands on, buy/borrow an inductive tachometer and TEST, TEST, TEST! The downside of that is you might have to spend a day on the water, running around at high speed. Tough duty, I know, but, hey, it’s gotta be done!

[olcah]

Thanks Chinewalker. Somebody has to do it. Might as well be me.

[billy-t]

Hi well i dug up the propeller from the shed, bit of an adventure that i am sure most have experienced.

The only number i can find on it anywhere is R106 on the side, does that help anyone?

Thanks

Billy T

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