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Pilot shaft for a boat?

Old 03-30-2006, 04:39 PM
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330T
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Default Pilot shaft for a boat?

If i cut the Pilot shaft will it work for a boat? Enough room for the flywheel and collet? Its an OS motor with the pilot shaft
Old 03-30-2006, 04:45 PM
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Default RE: Pilot shaft for a boat?

If you're talking about a .12-.18 engine there have been problems with them not having enough threads to really get a good grip for the flex cable collets because of the thickness of the flywheels.
Old 03-31-2006, 08:14 AM
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Default RE: Pilot shaft for a boat?

I am talking about them...

hmm... wonder if i could trim the face of the fly wheel...
Old 03-31-2006, 09:58 AM
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Default RE: Pilot shaft for a boat?

If you have a lathe.
We ran into this problem a on buddiesw boat. The flex cable collet came loose and he lost the flywheel plus the cable and everything attached. I loaned him the parts to get his boat back on the water then I guess that you could imagine what happened to those. He was going to end up by replacing the SG crank with the long threaded version from another OS .12 .
Old 03-31-2006, 10:21 AM
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Default RE: Pilot shaft for a boat?

i have access to a lathe, how much needs to come off the face? also will the amount that needs to come off affect the weight of the flywheel enough to affect its ability to keep the motor running smooth?

[&o]
Old 03-31-2006, 10:29 AM
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Default RE: Pilot shaft for a boat?

I don't know, it's something that you might be able to figure out better than me. I've messed with a few different flywheels on my boats, the OS is my favorite but have tried the one that somes with the Miss Bud and another that ABC Hobby used to make.
If you could make or modify some flywheels that would work, you could make a lot of people happy and yourself a few bucks in the process.
Old 03-31-2006, 10:57 AM
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Default RE: Pilot shaft for a boat?

having eked by college physics, i'll look at this logically…

As long as the rotating mass is roughly the same the depth of the flywheel does not really matter that much. But the diameter and how much weight is on the outside of that diameter probably has a large affect on performance..

With that in mind, I’ll start by trying to back cut the end leaving most of the mass on the outside of the flywheel..

Maybe if all goes well I’ll spin my own out of solid bar stainless
Old 03-31-2006, 11:34 AM
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Default RE: Pilot shaft for a boat?

Stainless would be cool. ProBoat uses brass that might be easier to machine as I modified one one to make it fit low in a boat. That was easy to work with using my primitive machining, a drill and a file.
Old 03-31-2006, 11:40 AM
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Default RE: Pilot shaft for a boat?

drill and a file... and it was balanced?

I have an extra proboat flywheel that will be my starting point
Old 03-31-2006, 11:59 AM
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Default RE: Pilot shaft for a boat?

I don't know, I never checked it. It was something that endedc up by not working out, an engine that didn't run well in a boat. I found out that some do and some don't because of intake and exhaust timing numbers. What may be killer in a car or truck might be a slug in a boat.

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