I have a Brison 2.4 on my 28% Ultimate and have been running a Zinger 20x10. I would like to switch to a carbon prop, possibly Mejzlik. Should I go with Mejzlik and should I stick with a 20x10 or should I go with their 20x9 or even 20x8?
Thanks.

My Brison 2.4 turned a Mejzlik 20x10 @ 7100 rpm.
Good prop for aerobatics.

Here's a Prop (Load) Chart based on the information from Diablo-RCU.
It looks like a tuned exhaust system would greatly improve RPM.

"Brison 2.4 @ 7100 RPM"

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Schpankme

What does the 16K stand for?

Joe

Yeah what do all those big numbers in the boxes stand for? I kind of understand everything except the numbers in the boxes. They go up with pitch and diameter.

A 20x8 or 21x8 menz works well for good pulling power. Or a mejzlik 20x10

The number in the cells represent the calculated load of the prop selected.

Prop Load = Diameter^4 x Pitch /100

20x10 prop would be figured as: 20^4x10 = 1,600,000 /100 or 16,000

"Brison 2.4 @ 7100 RPM"

Now all you need to do is following along the chart fiinding like vaules and your engine should turn at the same RPM, utilizing the same Prop Load.

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Schpankme

I'm lost! How does that help in figuring out what prop to use etc???

Joe

I think that he used the 20x10 @7100 RPM that Diablo-RCU mentioned in his post. He took the 20x10, calculated the load (16,000) then found all the different sized props that would load the engine to 16,000. I believe his graph assumes a peak RPM of 7100 for all props shown on that graph. It would be better if it said at the top of his graph "Brison 2.4 @ 7100 RPM". That's what confused me, I didn't know the RPM was constant across the entire graph.

Ahhhhhhhhhhhhhhhhhhhhh hmmmmmmmm! Thanks Joe!!Happy TG!!

Joe

You are correct Joe and your "more gooder" explanation is appreciated >

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Schpankme