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 shaft and prop for inboard 
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Joined: Wed Feb 15, 2017 12:14 pm
Posts: 1
Post shaft and prop for inboard
making an inboard flatboat but can't find any aluminum props that are threaded. The only way i found to fix it was to get a stainless prop or find another shaft even though i have put many hours into searching for the right one. If anyone knows what i can do please help. The reason i want aluminum is because i would rather break the prop than the motor or shaft. It is more easily replaceable. The motor is a 18 hp duromax on a 12-15 foot flatboat


Mon Feb 20, 2017 8:06 pm
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MMT Pro Member

Joined: Tue Oct 21, 2014 7:15 pm
Posts: 80
Post Re: shaft and prop for inboard
Had plenty inboard mudboats,here is what I would do and what I have done countless times.

Brass or stainless steel sub surface weedless propeller and a 3/4" or 1" shaft.

You can either use a 3/4" shaft and let that be your week point
Or rely on the coupling key to shear.

I have never broke a crank,coupling or u-joint.
Have lost props,bent rudders,broke shaft and sheared many cheap steel keys.

I'd atleast want a 1" shaft if I was going to ride alot in stumps and unfamiliar territory.

However its very hard to break a 3/4" shaft.
There will be more screw on props avalible for 3/4" shafts.


Thu Mar 16, 2017 4:34 pm
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MMT Pro Member

Joined: Sat Nov 10, 2012 10:52 am
Posts: 237
Post Re: shaft and prop for inboard
I agree with the above post,i used to run 3/4 shaft and 1" .....from 5 hp to 21 hp.
Never broke a crank,coupling,universal.....or even a key.
Tore up plenty brass wheels though,bent 1 shaft.
That was about a 10 year daily use boat in stumps and mud.
Personally id be more worried about the duromax holding up.
Read that its the cheapest of the china clones.


Thu Apr 13, 2017 8:41 pm
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