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[John W E]

hi there,


couple of pictures of Bob Kirtley's Flash steam hydro plane Pisces II  -  have a look at the size of the prop at the back end - it is BIG - .


Changing subject, but back to the couplings - Company in China (which I have dealt with before) and they aren't too bad - I haven't touch wood lost anything from them in the post yet.  They do a steel, bone coupling for model boats. Here is a link for it - this may help you.


Rc Methanol Boat Universal Joint Couplings Motor Shaft M6.35 / M5 To 4mm Hard Shaft For Rc Model Boat - Parts & Accs - AliExpress


john

[SailorGreg]

A dogbone type connector is available closer to home.  I can't vouch for its durability, but as it's metal I imagine it will take a fair amount of power.  It is made for 4mm shafts, but I guess could be drilled out for 5mm.


Greg

[Geoff]

I'm not sure about very high power but I've used the standard red Huco couplings in large models for many years without any problems. However I always use a double coupling., What a lot of people don't necessarily realise is that a single coupling really allows a little misalignment in one plane only so unless the other plane is perfect you will get vibration. A double coupling allows alignment in both planes which makes a huge difference both to vibration and noise.


However with the power you are looking to apply I suspect the Huco won't be strong enough, single or double.



Cheers


Geoff

[Dave_S.]

The question has become academic as the model was sold a week ago. The simple truth is that it was too large for my bench and storage area. I will have to set a limit at 3ft/i metre overall length from now on.

[Subculture]

Prop shop do them. Dumas do a plastic and brass dog bone coupling.

https://www.prop-shop.co.uk/products.php?cat=shafts-and-couplings

https://www.harbormodels.com/dushco.html