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Go Back   SailNet Community > On Board > Gear & Maintenance > 1 inch prop on 25mm prop shaft?
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Thread: 1 inch prop on 25mm prop shaft? Reply to Thread
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Topic Review (Newest First)
07-12-2014 07:50 PM
ReefMagnet
Re: 1 inch prop on 25mm prop shaft?

Not saying I would recommend this, but if super desperate you *might* get away with using thickened epoxy between prop and shaft. Just make sure it's a low temperature softening type so it can be removed in the future.
07-12-2014 01:56 PM
hellosailor
Re: 1 inch prop on 25mm prop shaft?

Lawson, there should be plenty of machine shops in the Tampa area that can make it work. They shouldn't have to move a lot of metal to make such a slight change.

But for the past 20 years or so, "Metric" has been spoken in most of the US, even in places like Tampa. You should be able to get the right prop and save a fast hundred bucks in machine shop work. And if no one local has what you want?

I'm afraid to joke that you can buy the prop on Amazon.com after all, they have everything else there. (sigh) But I'd still bet that buying the right prop and having it shipped in via Priority Mail or UPS is going to be the fastest, cheapest, AND most reliable solution. If not from Tampa, there may be a prop shop in Jax, FLL, or Miami and those are all overnight shipments via UPS ground, no big deal. They habla lots of metric in Miami.
07-12-2014 12:42 PM
Ferretchaser
Re: 1 inch prop on 25mm prop shaft?

as long as both pitches are the same ( I mean the pitches of shaft and hub, not the prop pitch ) you are fine. To find out, blue print them. If it matches up you are good to go, if not go shopping again.

ATB

michael
07-12-2014 12:32 PM
SloopJonB
Re: 1 inch prop on 25mm prop shaft?

Mixing SAE & Metric is a mugs game. It's bad enough when you have both types on the same boat or car but to mix them on the same piece is asking for it - they are NOT the same, even though they get close some times.
07-11-2014 05:16 PM
pcmm
Re: 1 inch prop on 25mm prop shaft?

Quote:
Originally Posted by sailorbill1 View Post
I fitted a 1'' prop to 25mm shaft and dually lost it,though I did stop the motor twice running over heavy kelp at night coming into harbour, I was lucky in that because I hadn't put her into reverse to clear the kelp I managed to motor into the marina and lost her when I put her into reverse or neutral inside the marina, no damage, dived for hours-never found it.on the good side I replaced with a kiwi prop,briliant.
You shouldn't be able to lose the prop if its installed correctly with the castle nut and cotterpin.
07-11-2014 02:27 PM
sony2000
Re: 1 inch prop on 25mm prop shaft?

Yes anyone running a loose prop would be out of their mind.
Buy a used one. You could be 11X7 RH X 25mm.
07-11-2014 12:10 PM
TQA
Re: 1 inch prop on 25mm prop shaft?

Quote:
Originally Posted by sony2000 View Post
The difference is .4mm. Not too much of a difference. The taper has a greater significance, but the keyway takes a lot of the force. The nut should be metric though. I would use a readily available cheap 1'' prop until I could find a better overall prop, during haul out.
The taper is the problem, you will not get the prop to seat.

Running with a loose and or out of balance prop will cause damage, possibly very considerable damage to the shaft, the cutlass bearing, shaft seal, maybe the P bracket and maybe even the gearbox. Please don't do it.

Especially as the price for a new prop WILL BE THE SAME regardless of the shaft size and taper.
07-10-2014 10:44 PM
sony2000
Re: 1 inch prop on 25mm prop shaft?

The difference is .4mm. Not too much of a difference. The taper has a greater significance, but the keyway takes a lot of the force. The nut should be metric though. I would use a readily available cheap 1'' prop until I could find a better overall prop, during haul out.
07-10-2014 10:06 PM
TQA
Re: 1 inch prop on 25mm prop shaft?

Can a prop bored for a 1" or 25.4 mm shaft ay 12/1 taper be machined to fit a 25mm shaft at 10/1 taper.

Nope don't think so.

Pony up for a new one and be thankful it was not a Max Prop you lost.
07-10-2014 09:40 PM
sailorbill1
Re: 1 inch prop on 25mm prop shaft?

I fitted a 1'' prop to 25mm shaft and dually lost it,though I did stop the motor twice running over heavy kelp at night coming into harbour, I was lucky in that because I hadn't put her into reverse to clear the kelp I managed to motor into the marina and lost her when I put her into reverse or neutral inside the marina, no damage, dived for hours-never found it.on the good side I replaced with a kiwi prop,briliant.
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