George Lendich wrote:

Lynn,
I found TDC as you suggested and marked it, put in the rotor and had a play around ( no degree wheel yet).

Had a guess-da -mate on your IO ( looks similar to the Leeman) and your IC which (looks to be a good 5 degrees after the Leeman)  - 5 degrees before 90
degrees ABDC.

Question !!
As 90 degrees ABDC is the max volume have you elected to have the 5 degree safety margin so as to not have a problem with compressing the mixture and having
some forced back into the intake tube???

Another question!!
The overlap with a PP is much greater - with a greater volume of  exhaust gas mixing with the intake, there is a greater chance of decreased volume efficiency
( rough idle etc.)

OR

does the greater volume of intake compensate for the mixture of intake and exhaust ( maintaining volume efficiency) ? with the nearby butterfly giving only a
better degree of control at low RPM?

Now given all this wouldn't it be better to have a late IC ( such as yours) and a later IO ( even later than Jerry's) to minimize mixing and have a better
volume efficiency.

The more I read the more I'm confused!
George (down under))

"Lemings, Bob" wrote:

The more I think about engines and props, it becomes more apparent that the prop is just a big fan that keeps the pilot cool--- If it stops, you can actually see the pilot start to sweat.

Bob

 
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