Hi Ian, thanks for your thoughts.
The couplings I have see 19mm dia and about 25 mm
Long.
Always take care to align the shafts.
As it is about to rain think can spend an hour or so fitting one.
Will advise experiences next week after my water tests,
Rowen

Hi Rowen and Doug,
Let me shed a little light on this subject for you. As a retired Mining Engineer the Coupling you are looking at is a high torque coupling and doesn't take to misalignment. Putting large drives together we always had the inputs on the winder drives use a pin coupling or hooke coupling where we would get misalignment (due to motors magnetic centres) The output coupling were always similar to the ones you intend to use. They carry a high torque but don't like misalignment.
Just my tuppence worth

"Building a RAF RTT Launch"👍
Looking forward to your blog on that Rowen😊
Cheers, Doug 😎

Not for my Seal but she would be easy to retrofit.
Building a RAF RTT Launch using another MTBHulls hull.
Another winter project, just testing drivetrain

"Babyhood" Wondered about that!😮
Thought maybe you might have got 'em as a freeby with a months supply of Pampers😂🤣
After several such 'curious' substitutions I learned to switch off the Auto Correction of the spell checker. Now it just underlines in red anything it doesn't recognise.
Then I can check it and correct or educate the spell checker by adding to the dictionary.😊
BTW: are these couplings for your Seal or have you got something else on the boil?
Cheers, Doug 😎
PS I also read back through my post before hitting the Post button😉

Banggood ! Damn spellcheck

Thanks Doug. Have already got them. Somewhat different as they clamp directly onto the shaft and there is a thin slit scroll to provide the flexibility. The input & output shafts can be different sizes
Will install during the winter refit.
Look good,got them from Babyhood.

Hi Rowen,
Here's the link to the Krick version that I use.
Only German I'm afraid (despite selecting English🙄), but I think you can see that they are available for a variety of motor and prop shaft sizes👍 They usually deliver to me within 3 days and they quote approx 7 days for overseas👍
Cheers, Doug 😎
https://www.krickshop.de/Accessories-Spare-Parts/Accessories-for-Ship-Models/Shafts-Couplings/Stegkupplung-Verbinder-1-Stck-.htm?shop=krick_e&a=article&ProdNr=63800&p=192

Go for it Rowen👍
Or buy the Krick version. Delivery might be quicker than from our Chinese 'friends'!!
I'm very happy with them and am in the process of swapping all my ancient UJ/Kardan couplings for this type. Had absolutely no problems running my Sea Scout with a Propdrive 2830 brushless, 30mm 3 blade prop on a 3S LiPo. And it's nice and quiet😊
Cheers, Doug 😎

Thanks Doug, that is reassuring. These are in aluminum - do not know what grade and they come from the Orient.
Going to be a struggle to get in but as the alignment is quite good should be worth the effort. The current Hookes joint style couplings
are noisy

Hi Rowen,
No need to excuse the paper clip.
On the contrary, it shows us the scale/size of the part👍
It looks very very similar to the couplings which I now use, albeit made of a thermoplastic not metal. See pic of the coupling I use from Krick here in Germany in my Sea Scout. But the principle seems to be the same.
They can absorb minor discrepancies in alignment of motor and shaft but consequently do force you to take extra care when fitting and aligning the motor(s). No bad thing IMHO😉
So far I am very happy with them😊
Cheers, Doug 😎