ORIGINAL: Barry Cazier
Bubbagates or ?...
I'm mildly disappointed in the RPM of my new DA and also the EVO 45. I want to change props down one size to increase RPM and thereby hopefully a little bit of thrust. Because these propellers are so expensive I don't have the luxury of buying 4 or 5 and just trying them.
Here's my situation:
DA50= NX22x8. If I want to drop one size do I go 21x8 or 21x10? Which is just one step down?
EVO45= NX21x8. Is it 20x8 or 20x10 that is just one step down.
Thanks for your opinion.
Barry
Depends on your definition of "step"
. Going down an inch in diameter while going up two inches in pitch like your suggesting with the DA will probably not net you much of a change. There are a lot of formulas around for determining "equivalent" prop sizes, but I have always found that diameter change makes a lot more difference than pitch changes. I ran a 22x8 on my Brison 3.2 for awhile, then changed to a 21x8, both NX props. Engine was much happier; it's a big change in load. Same with your Evo, I would suppose. I'd try the 20x8 rather than the 20x10 if you are trying to pick up some RPM and get better response. My opinion, your mileage may vary....