previous YS 91 user (of infamous overpowered warbird squadron) I'm currently building a new plane, when we used the 91's we proped with 12x9, 13x8, or 12x10. motor over ran factory recommended rpm 11,500 on the ground, never had problem with any of my 91 motors my oldest one is 2 years old and still running like i bought it yesterday, it's never been in for service.Great motor don't know why they dropped it.
But on to my question will the 110 allow me this same service with prop change due to increase in power say 12x10, 13x10 or some where along those lines.
By the way the 91 with 12x9 prop in 40 size warbird , over 130 mph.

You can probably go up a couple of pitch and be right where you want to be. The 110 will work just like the 91, although you might notice some increased vibration at the higher rpm levels.

I am having a YS1.10 turning an APC 13x11 on a WM Dago Red with a 3 1/4" Dave Brown Spinner. Fuel used in Cool Power 25%. Current HS position is about 2 clicks richer than the "300 rpm lower than max rpm" position. The current setup allows the plane to perform "unlimited" vertical. Tach reading on ground is 9,900 rpm with approx 2200 on idling. Will be looking forward to lean out to the max healthy HS position.

Question needing your advice ... assuming objective is to trade climb for higher speed
1) Should I try to find a prop that will keep the rpm to within 9,000 ~ 9,500 range?
2) If so, what size prop would you suggest me trying?
3) What is the consequence of going for a prop that gives higher than 9,500 rpm (of cource keeping it under 13,000 as per specification)?

Thanking you in advance.

cheers,

You can run the engine faster if you like, but avoid any rapid descent at full throttle as it might float the valves.
Prop accordingly, more pitch at a given rpm = more level flight airspeed and less vertical.

Hi Dave,

Could you please advise the advantages of keeping it within 9,000 ~ 9,500 rpm?

cheers,

That's where it makes the most HP.

Got the idea. Thanks!

Good flying!