Prop CUP
 

On 232-252-272 perf. Do you need cup?

Need more stearn lift or bow lift??

Prop will be worked by Darin...

I am making a big jump from a mirage 23 plus to a 25 non-plus

I figure the best bet would be :

Tinning the blades :+300 RPMs

Cutting diameter 1/8" : +150 rpms


On the other side : Adding some cup I figure -150 RPMS

That way, I guess I would still be running 4500 RPMS (same as my stock 23 plus)

Also Darin, I may try that SATTIN FINISH.

I also heard from diffuser ring job???

Any experiences or inputs to help me and Darin make dynamite out of that 25 mirage?

Seems like a lot of changes to me to make all at once. You may think about doing a few of those thing and NOT thin them out. There is a lot of missing info hear that makes it hard to know what to tell ya. For example. What are you running for a engine. What speeds are you seeing now. Does the Plus carry the bow? Do you think you need more bow lift?

Jon

Jon ,Yes you are right but js232 live's in Canda and this is what I was told to do ! Darin

Jon ,Yes you are right but js232 live's in Canda : ??


and this is what I was told to do ! Darin ??

Now you guys got me some worries... I tought it would be a perfect match considering all the inputs I got here on the board...
The Mirage + 23 handles great. All I want is more speed. Even if I have to get those tabs down on take offs... ;-) I am just doing a repeat of some jobs that worked great on other Bajas....Mirage 23 to 25, diameter down 1/8 to 1/4, cup, thining the blades...


J-S

Jean,
You will be in the ball park, I have done this before as well. Your engine has a wide WOT range so you should be ok. Just tell Darin your current WOT RPM with the MP and he can do the rest.

You'd think a frog :frog: would know what he needs for propulsion!:D:D:D

Mind you I had to learn I need gas!