429CV23

Does anyone know if an adapter is available? I read it has a 5mm shaft.
Picked up a Prather S270 which has the same specs as the original prop, but has a 1/4" ID, which is too large.

crapshooter

Yes you can get an adapter that drops the prop inner diameter down from 1/4 inch to 3/16 in [ 5mm ] not sure who sells these as you used to get them from either Prather props or Octura props. if you can,t find any you can make your own with a couple of different size k&s tubing starting with 1/4 inch id down to a 3/16 inch i.d. or find a piece of brass tube 1/4 inch o.d. and 3/16 inch i.d. about 3/4 inch long will be fine.

expresscraft

take your prop to a hardware store, I simple piece of brass tubing is all it is. of course cut to length. A K&S brass tubing rack at most hobby shops have the right size, If you can find a hobby shop anymore.

429CV23

Thanks for the info guys!!!
I contacted Bonzi this morning (where I purchased the prop), and they're sending me several for basically the shipping cost. Great customer service!

expresscraft

Dan is very good for the model Boating world.

429CV23

I found 1/4" brass tubing at the local hobby shop. Wasn't as tight a fit as I thought it would be. I'll see how it works if we head to the lake tomorrow. I should have the reducers from Bonzi mid week, so I'll see if they have a better fit.

crapshooter

just for now until your proper bushes arrive , wrap a slight piece of tape around the shaft where the bush / prop will seat as this will reduce any chance of bad vibrations caused by the prop not being centered correctly on the shaft. you want the bush to be a snug fit on the shaft not sloppy.

expresscraft

some of the wall thickness is different on the brass tubes available. the tape should work but sometimes you can down sleeve the 1/4 rod that OD fits the prop but ID does not fit the shaft. most of the reducer busing will brig your 1/4 prop down to fit a 3/16 shaft, not a 5mm.

429CV23

I see what you mean. Got the reducers today from Dan; ID is too small. The brass tube I got at the hobby shop isn't completely uniform; I found a piece that is very close.

So is it economical to switch the 5mm to a 3/16" or even 1/4"??

expresscraft

3/16 and 1/4" are the 2 most common cables. You can even get a 1/4" cable that the shaft is turned down to a 3/16 for smaller props.. Please give more information on the boat and hardware and engine you have.. Will be able to help you more. I do not want to say you 5mm shaft is bad, but for standard itens like the s270 prop. it could be. You could also give Octura props a call and see what they have that might have a 5mm hole. in a prop very close to the same size.

429CV23

It's a Pro Boat Hypersport 48 with a Zenoah G260PUM.

crapshooter

Is the flex shaft a 1/4 inch diameter with a turned down to 3/16 inch section where the prop slides on ? i find it hard to think the makers of this hull fitted a 3/16 inch shaft with a 26 cc gas engine thats going to swing rather large props like the 270 / 275 etc.

expresscraft

There are not a lot of pictures of the Hypersport out there, But what I did see shows a cable with a square collet and a flex ferral that the prop shaft gets put in place with set screws. It does not show the strut or stinger drive or the back hard ware. But as always it's probably Pro boats typical junk. When I sold pro boats in my hobby shop it was a common up grade. as people almost always had drive problems with there pro boat gas models. (Again pictures would help) I would remove the drive tube with the garbage Liner in it, that will eventually spin and destroy it anyways. Get a good collet and cable (Gizmo motors.com or joe at zippkits.com) along with a new brass tube for the cable to run inside of, 5/16 is what you need. a new strut or stinger. would be able to tell you....IF YOU POSTED A PICTURE. these would have lead Teflon bearings, you would pull your cable out from the back of the boat from time to time and re grease your cable. This is why most RTR places use the Teflon liner, no maintenance needed till it fails. which is always pretty soon, but by then its your boat. To me this upgrade is not that much work and is better then a modified motor..Drive line is a foundation part of the boat, everything else can be great. If the drive line is not then the boat is not. I am just playing, but REALLY help us help you and post some pictures.

429CV23

This should be post #10, so hopefully I can add pics now!

429CV23

If any other pics would be helpful let me know.

429CV23

Looks like they won't link from photobucket.
Here's a link to the album: http://s48.photobucket.com/user/429c...?sort=3&page=1