Hi Nick
following on and also asking a question at the same time - Are you building the Swordsman from this plan build?
The reason I ask this is - if you have the plans - the prop shaft length that you require should be illustrated in the plans and also the same with the coupling.
Setting up of the prop shaft should be straightforward, if you are following this build in the Masterclass.
You make up a little template from scrap plywood which gives you the angle and the position of the prop tube on the hull and it is temporarily glued into place whilst you epoxy the tube into place permanently.
http://www.modelboatmayhem.co.uk/forum/index.php/topic,7668.msg74050.html#msg74050The model, which was built for this topic, has had 2 types of speed controllers. :-
- The first one was an Electronize with a BEC which is a bit heavier than a small pack of batteries.
- The second speed controller is my mate Dave's pet hate - its the blue aluminium type from Yongggg Konnng which tend to go poof with some blue smoke

As to date I have had no problem with it. This also has a BEC - needless to say it is lighter than the Electronize one. Neither of these speed controllers' weights made any difference to the performance - it is still a nippy little model.
No need to go over what Dave says about the spray rails on this model - as they are needed to enhance the performance. Unless of course you wish to make the model into a submarine

Aye
John