Morning all, thanks for the comments. Yes Brian, I have the set of films as a guide and often refer back to them for all my details. It's sort of 'my Bible' but a pity my computer doesn't transfer his spoken language over to English. tehe. I'm still fighting paying all that money for the two more required for the bow and hope to make my own. The plan is to only have one up the front end which will I will construct and be a sturdier design made of metal with a larger prop for plenty of pulling power.
Hi Derek. In answer to your kwestions.
1: The motors are special slow running 500 size and were chosen for their quietness and slower than usual rotational speed. These were chosen after reading other folks write up's on the destruction power through the plastic bevel gear system.
They are both wired in series on the 12 volt line to make them run even slower. If it proves 'too slow' then I can easily wire them back in parallel.
2: You may be right about the reduction gears. I will count the teeth and let you know. As far as I'm concerned, it's a welcome feature.
3: I have no way of knowing the rotation, but the 'props' do hum around at a modest speed. My original intention was to 'dance around' the lake in graceful pirouettes and tight circles, just to prove it could turn on a sixpence. All nice and sedately when compared to the gut pulling tug under strain, or the captain wanting to go water surfing.
4: The 'Z' arm is only there because the threads on the adjusting arm cannot be drawn in any closer. It will eventually be a straight bar with just one thread for adjustment, but at the moment it's 'lashed up' quickly, as I wanted to test it working.
As an addenda, you may notice the neoplastic tubes fitted in the drive shafts for quieter and vibration free running. I shall soon be ready to float test her.
Cheers for now. back down the shed.
ken