Work in progress on a 1 hp outboard for a kayak. I'm wanting reliability and hull speed only. This is really only at the "proof of concept" stage with most of the bits and pieces being scrounged. If it works out I will lash out on stainless steel shafts etc
32cc McCulloch (clutched version) $13.00
2.1 gearbox... output shaft at 90 degrees to input. $5.00
Suprised? It's so crazy!... but it works!
Meaty cogs! Whether it lasts is still to be seen... at $5.00 NZD who cares!
Youngs T-10 prop. $ 24.00 ($16.50 plus shipping/imported from USA)
The drive shaft is aluminum tube with the standard square shaft crushed inside with a vice. The end that fits in the drills chuck is an old bit that has been hammered into the tube.
I've had this running in a barrel. It seems to be fine, clutch engages and doesn't seem to be slipping. There appears to be easily enough thrust to get me along in the kayak at least as quick as padding.
I need to sort out the controls/steering and get it out on the water.
Problems? Oddly enough, the drill's housing is not waterproof... go figure? I shudder to think what salt water will do to it.
Other thoughts... these old drills have two ratios 2.1 and 6.1, I have an 8 inch prop that I might give a whirl at 6.1 and see if that generates much thrust at 500 - 700 rpm at the prop.