Minimono Upgrade Drive Shaft DIY

[MAMBA2200]

I will send you one pm me your address

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[MiniMorris]

I'm going to post pics of the whole project. If anybody wants a particular shot, LMK (even though everybody on this thread has already done it.)

[MiniMorris]

I have some slop with the prop. Like the prop nut is on a silver shaft that wiggles in the stuffing tube is this normal.?

[MiniMorris]

ImageUploadedByTapatalk1357687072.443487.jpg
Like this gap.

[MAMBA2200]

I used a smaller brass tube for a bushing mine was the same way till i got one size smaller and made the bushing

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[MiniMorris]

Well I just tested my boat and the pointed end prop nut was vibrating because the last inch of the flex shaft is loose, because I'm using the Teflon tube stretched over that part.

Sound right?

[MiniMorris]

What is the outside diameter of the bushing exactly. And does your prop move at all when running dry and is it bad if it moves?

[MiniMorris]

Is it bad if the prop wobbles. What damage can it cause

[tlandauer]

Accelerated wear and tear. Particularly on bigger and more powerful boats. Usually it is the other way around: out of balanced prop and/or drive train components enlarging the bushing in the stinger or strut, the looseness in turn allows more wobbles, and so on... I had a Proboat Fast Tech that had one of those steel prop from PB, it was heavy and out of balance, took only two runs to wear out the bushing, luckily I caught it before it could do more damage. It puts stress on the bracket and the transom.
Can you correct that? How bad is it? The picture doesn't tell the whole story, does the vibration get worse as you speed up the motor. Water should dampen the wobble somewhat, plastic prop is light and doesn't have that much mass as with steel prop.

[MiniMorris]

Accelerated wear and tear. Particularly on bigger and more powerful boats. Usually it is the other way around: out of balanced prop and/or drive train components enlarging the bushing in the stinger or strut, the looseness in turn allows more wobbles, and so on... I had a Proboat Fast Tech that had one of those steel prop from PB, it was heavy and out of balance, took only two runs to wear out the bushing, luckily I caught it before it could do more damage. It puts stress on the bracket and the transom.
Can you correct that? How bad is it? The picture doesn't tell the whole story, does the vibration get worse as you speed up the motor. Water should dampen the wobble somewhat, plastic prop is light and doesn't have that much mass as with steel prop.

Thank you for replying. I stretched the Teflon coating over the last inch or so where the the prop shaft leaves the stuffing tube. The tip of the prop nut moves 1/16" to 1/8" side to side. It doesn't seem to bad I will see I if it has more side to side play when it's moving or if get worse the faster I go.

[MiniMorris]

It moves side to side a little more at speed. Can I still run it?

[czegard]

I had the same problem with vibration of the shaft with my Minimono. I solved it with a smaller brass tube of 5/31 x inside the 3/16 x 0.014 (just half and inch at the end). Now I have cero vibration. Use Loctite 603.
My specs are the following and I don´t have temp problems:
stock motor + octura .098 flex wire + Octura collet + 3/16 K&S tube + Teflon + Balanced Octura prop 432+seaking 35amp+aluminum rudder (shorter)+ larger stabilizer +sharpened turn fins + prop nut

Cheers

Well I just tested my boat and the pointed end prop nut was vibrating because the last inch of the flex shaft is loose, because I'm using the Teflon tube stretched over that part.

Sound right?

[MiniMorris]

I had the same problem with vibration of the shaft with my Minimono. I solved it with a smaller brass tube of 5/31 x inside the 3/16 x 0.014 (just half and inch at the end). Now I have cero vibration. Use Loctite 603.
My specs are the following and I don´t have temp problems:
stock motor + octura .098 flex wire + Octura collet + 3/16 K&S tube + Teflon + Balanced Octura prop 432+seaking 35amp+aluminum rudder (shorter)+ larger stabilizer +sharpened turn fins + prop nut

Cheers

I used a piece of 5/32 x .014. Is this right because I still have slop between prop shaft and inside of stuffing tube

[czegard]

I used a piece of 5/32 x .014. Is this right because I still have slop between prop shaft and inside of stuffing tube

Are you using the Octura 0.098 flex wire?

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[MiniMorris]

Yes, the tip moves about 1/16 to 1/8 side-side/up-down