cox24711
Well-Known Member
- Joined
- Sep 6, 2016
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Recently in a daydream during assembly at school I had the idea of bringing British Seagull back, with new model, a single cylinder 102cc ohv 4 stroke using mostly the same parts as the original as possible. like the gearbox, props, mounts, flywheel, water pump, carburettor and fuel tank just to name a few. Oh and it will certainly be rope start with no recoil! 
(they have certainly proven themselves reliable) due to their outstanding reputation, and knowing that many people are fed up with the maintenance of new small outboards from the regular scumbags (Mercury Yamaha Evinrude etc) with the stupid cowlings getting in the way, the recoil starters watch spring snapping, the annoying impellers that wear out or go hard and their unnecessary complexity. They certainly aren't built to last.
The one trait that you want in an outboard is for it to be reliable and that is what british seagulls nail. Also the ease to work on and accessibility. The idea is to make maintenance of it as simple and easy as possible, so it isn't a chore.
Because of making new 2 strokes is now outlawed the only option I am left with is a 4 stroke. My aim is to make the simplest design possible, with as many off the shelf components as possible, too keep the costs down.
I am not sure yet what the bore and stroke should be to keep it in 4hp-5hp range possibly the same as the original 57mmX40mm. I know that with the original gearbox the RPMs need to be quite high ~4,000 so we are looking for peak power at High Rpms.
Thanks Greg
(they have certainly proven themselves reliable) due to their outstanding reputation, and knowing that many people are fed up with the maintenance of new small outboards from the regular scumbags (Mercury Yamaha Evinrude etc) with the stupid cowlings getting in the way, the recoil starters watch spring snapping, the annoying impellers that wear out or go hard and their unnecessary complexity. They certainly aren't built to last.
The one trait that you want in an outboard is for it to be reliable and that is what british seagulls nail. Also the ease to work on and accessibility. The idea is to make maintenance of it as simple and easy as possible, so it isn't a chore.
Because of making new 2 strokes is now outlawed the only option I am left with is a 4 stroke. My aim is to make the simplest design possible, with as many off the shelf components as possible, too keep the costs down.
I am not sure yet what the bore and stroke should be to keep it in 4hp-5hp range possibly the same as the original 57mmX40mm. I know that with the original gearbox the RPMs need to be quite high ~4,000 so we are looking for peak power at High Rpms.
Thanks Greg
