ORIGINAL: switch26
dont mention it,now another question for the board,what prop should i get for my pitts?the prop in the picture was mounted only to take the picture and will not work on the DL 50,it is a 20x10 and i wont use it,it was given to me,i think i want to stay with wood props but im not sure what brand to get or what size,seems most everyone is using diferent ones but i would like to get the ideal one for the application,also do i need one for break in and another for flying?
Hi Switch26
Opinions on prop selection and manufacture vary a lot, and you will get 5 different answers from 5 different pilots.
You can break your engine in with a 22x8 and then fly with it or you can replace it with a 22X10 or a 23X8.
I like Xoar props, as they are very good value for the money. But
Vess, Menz, Mejzlik, Bolly, NX, JXF, are all good as well, you will get higher RPM with Vess and Mejzlik, but I'm not sure how the thrust is. I can tell you that Xoar pulls like a bat out of hell. Even with the added drag of a bi-plane. I clocked my Pitts with a radar gun in straight and level flight at 95 MPH with a Xoar 22X8 .
I cannot tell you where to buy all the different props, but I can give you a web site for Xoar, they ship fast and have good prices, you can also pick up a couple of spare spark pugs for $7 bucks a piece as they are hard to find.
http://www.thunderboltrc.com/
Here is what I got with Xoar on the DL 50. The thrust readings may or may not be accurate, as I'm using a 50 lbs digital fish scale and did not verify its accuracy with dead weights. Also the digital fish scale bounces around within a ¾ lbs range ( it's not a steady number) I post the reading in the middle of the range.
The two readings can be compared to each other, as I measured both props the same way.
With Xoar 22x8 was turning 7200 and pulling 25 lbs of thrust @ 1200 ASL and 74 F
With Xoar 23x8 it's turning 6700 and pulling 26¼ lbs of thrust @ 1200 ASL and 74 F
My RC Guys Pitts with the DL50 and 22x8 Xoar combo is faster, but the 23x8 Xoar has better up lines.
With the 22x8 the DL50 engine accelerates a bit faster, but the 23X8 idles better.
Another thing I notice is that what I thought to be engine exhaust noise with the 22x8 turned out to be prop noise. The plane is noticeably quieter with the 23x8.
All in all I like the 23x8 better on the DL50 Pitts combo.
Bound_4_Hell
Life should
NOT be a trip to the grave with the idea of arriving safely in a well preserved body,
but rather to skid in sideways,
a joint in one hand, and another joint in the other,
body thoroughly used up, totally worn out and screaming
"WOO HOO what a ride".