My dad and I have a Bull Ring Tigre 46 we are getting back up in the air and looking for some advice. We have always had to run this engine a touch on the lean side, or maybe not lean but a lot higher RPM than a standard Tigre 46. Consequently we have to go down on the pitch of the prop to slow the airspeed down to be able to do the pattern at a more reasonable speed. We turn our other standard Tigre 46's anywhere from 7100-8100RPM depending on the plane and prop. Usually a 12 x 6 prop. This engine will almost not fly the plane at those RPM's. It acts like a Fox 35 with the burp when running slow and it doesn't want to 4 cycle at all. We are turning this motor 9100-9500 RPM on a 13 x 5 Zinger prop. Curious if we should look into a 3 bladed prop. We are just experimenting with ideas here and not sure if I even really have a question haha but maybe if someone has more experience with this motor or higher revving motors could let me know what has worked well for them. This motor is on a blown up original Stiletto design 59" wingspan. Dave Trible if your out there would one of those 3 blade props you were telling me about be a good fit for this motor?
I had one but it had, unfortunately, been modified to run at low RPM.
Sounds like you are on the right track with the pitch. I would suggest a 12-4 and maybe 10000 rpm. You want it spinning just enough off of peak to still gain power in the maneuvers at a reasonable level flight speed, at least to start with. As you gain experience and get a workable baseline setup, then you can considered more pitch and a smaller venturi.