Dave Hinz wrote:

On Sun, 23 Jan 2005 21:00:53 -0800, Tim Wescott wrote:

Why is it that reed valves are so successful in high-performance
motorcycle two strokes yet are only used in teeny 'sport' class model
airplane engines? Is it just because you can't get suitable reed
material in such small sizes?


Nope, not that reason. Reeds give the greatest benefit in low-RPM torque,
in a 2-stroke engine. Since a model airplane engine never runs at that
low RPM, there's no need for them.


Inquiring minds want to know.


There ya go.

Dave Hinz

Well, they _do_ run at that low RPM, but they don't have to deliver
torque down there.

Makes sense -- thanks.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com