Niels Abildgaard
Well-Known Member
- Joined
- Jun 13, 2010
- Messages
- 563
- Reaction score
- 106
I want a new toy.
Swan 120 SW
Expensive toy
I am not keen on engine that is a hard pressed single cylinder Pollini 303 (38 hp/8000rpm) with a reduction gearing turning a 1.5m prop ca 42 rps.
Can of course make something better but will have to make a model to show all the doubting,wise guys with money.
Scheme is an inverted,four exhaust valved two stroke with first order mass balance shaft.
Prop act as flywheel and reliability is good.
This balance shaft turns opposite direction to crank and make engine as harsh or pleasant as a normal four cylinder four stroke with same total piston and conrod mass.
The underhung camshaft rotates same way as crank and can eliminate the first order part of the torque variation for one load condition (So called 70% power whatever definition is most valid.)
UHC wonder engine.
Swan 120 SW
Expensive toy
I am not keen on engine that is a hard pressed single cylinder Pollini 303 (38 hp/8000rpm) with a reduction gearing turning a 1.5m prop ca 42 rps.
Can of course make something better but will have to make a model to show all the doubting,wise guys with money.
Scheme is an inverted,four exhaust valved two stroke with first order mass balance shaft.
Prop act as flywheel and reliability is good.
This balance shaft turns opposite direction to crank and make engine as harsh or pleasant as a normal four cylinder four stroke with same total piston and conrod mass.
The underhung camshaft rotates same way as crank and can eliminate the first order part of the torque variation for one load condition (So called 70% power whatever definition is most valid.)
UHC wonder engine.