Thanks again. Strangely enough the prop shaft is threaded on both ends. The same thread on each end.

Cheers.

Many thanks gents (I'm assuming gents, sorry if not), all very useful information for the novice!
Next question if I may - my prop shaft was bought about 20 years ago and when I use my digital calipers the plain bit of the shaft is 3.94mm dia. How do I know what the thread is to order the correct threaded insert for the coupling? Can I somehow convert the number of threads per mm? 13 revolutions of the nut on the prop shaft moves the nut 10mm so i'm assuming that 10/13=0.76 means that it should be an M4. Is this correct?

Thanks again in anticipation.

Just noticed my typo in the subject - coupling

Hi, Having been supplied with the plans for the Perkasa a few months ago by Doug and now having a bit of time on my hands, I have just received my brushless outrunner motor. My question is do i use the plain motor shaft that comes out of one end of the motor or what I guess is the alloy device for mounting a prop on an aircraft? The latter fastens on the opposite end of the motor to the shaft, mounts on the outrunning element. Actual mounting of the motor will vary depending on the answer. Photo attached showing the plain shaft and alloy thingy.

My follow on question is what are recommendations for couplings these day? I have read the blog from 3 years ago but as things move i wondered what the current suggestions are? And possible suppliers in the UK.

The plain motor shaft is 4mm dia
The alloy thingy is 6mm dia (the unthreaded portion)
My propshaft is 4mm dia (the unthreaded portion)

Thanks for any advice offered.

Thanks everyone for the help in getting hold of these documents. Thanks to a member I am now sorted and hope to building again soon.

Thanks for replying. I now have several lines of enquiry so hopefully building will recommence very soon.

Steve

Hi, a fellow member may be making PDF documents available to me but if that doesn't work out I will pursue your offer with you. If that's ok? Many thanks for replying.

Steve👍

Ok thanks for the suggestion and I will bookmark for the future.

Thanks for the suggestion but yes tried that but no longer in business.

Nearly 25 years ago I was bought the kit for the KD Perkasa MTB and the plans for the Vosper Fire Tender (34" version). Having a young family at the time construction didn't very far until now. Having more time on my hands I am returning to where I left off but have found both sets of plans are missing and the construction booklet for the Perkasa. Can anyone help advise where I might get the missing items? In anticipation...