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Need some mechanical help in UK or Oz to prepare for electric - anyone recommended?

 

We are planning the parallel hybrid on our powercat.
At the moment, the thought is to attach a plate to the existing shaft-gearbox coupler (which I assume is there for some flexibility, like a more modern flexible coupling?) - see photo below at centre.
It has 4 bolts, and I think it could take a machined circular disc with width enough for a serpentine belt (to take the power of 10kW or so!) and cutout centre for the prop shaft.

So some questions for the world :)...
- can we add in the plate and use longer bolts against that coupler?
- how big a serpentine do we need to run 10kW through it?
- if we bolt onto the shaft side of the coupler, where there is space, can we sit the electric motor on the hull rather than the engine, since the coupler should have taken all the engine movement out of the equation?
- can we use a split plate with 2 bolts each instead of a single? If so, maintenance could be a lot easier!
- would steel be right for the plate?


Given all that ¡°thinking¡±, I need some mechanical genius to tell me I¡¯m wrong and work with me on making it right - does anyone know someone like that in the Solent area (boat) or Australia (us right now)?

Rob
 

A 1¡± clogged belt is OK for 10 kW. That¡¯s what I have. Perhaps you¡¯ll need the shaft pulley aft of the coupling - you¡¯ll need to pull the shafts and have them machined for the pulley key way. I¡¯d buy several extra belts and store them in place around the shaft so if you need to replace a belt, you won¡¯t need to undo the coupling.?


ive seen some companies that sell an aftermarket add on for a parallel system. Includes everything you need.?
 

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Hi Reuben,
Thank you! That helps a lot.

I was trying to get away from machining a keyway by bolting onto the coupling - the keyway would be much more costly and time consuming.?

I totally agree with the multi-belt idea too. If I can have a split pulley, then maintenance of it is easy and having a few spare belts makes the installation considerably more robust. If I can¡¯t split the pulley, it¡¯s probably ok as I don¡¯t expect it to go too wrong regularly (eek!).

Could you find the companies who sell the packs? Thunderstruck do so for reduction ¡°box¡± but don¡¯t assume it¡¯s a parallel Installation, instead it¡¯s for direct connection to the prop shaft it seems.

Thanks
Rob?


On 12 Jun 2020, at 12:10 am, Reuben Trane via groups.io <rjtrane@...> wrote:

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A 1¡± clogged belt is OK for 10 kW. That¡¯s what I have. Perhaps you¡¯ll need the shaft pulley aft of the coupling - you¡¯ll need to pull the shafts and have them machined for the pulley key way. I¡¯d buy several extra belts and store them in place around the shaft so if you need to replace a belt, you won¡¯t need to undo the coupling.?


ive seen some companies that sell an aftermarket add on for a parallel system. Includes everything you need.?
 

Not sure where you¡¯ll find a split cogged pulley. Not sure what you mean by ¡°pack?¡± The Thunderstruck motor mount will not work for you, as is. But you may be able to remove the stub shaft and coupling so that it could work? Or You¡¯ll have to make an aluminum plate on which to mount the motor - I found one last year already machined for most motors. You can use a jig saw to shape a 1/2¡± plate. You¡¯ll need a method to tighten the belt.?

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