RE: .91 Four Stroke Readings
Engine : OS .91 Surpass
(loooow time, 8-10 tanks)
Fuel : 15% Omega
Glow Plug: OS #F
Prop: 14x6 Zinger
RPM: 10,200
Prop: 14x6 Master Airscrew
RPM: 10,000
Prop: 14x7 Graupner Nylon
RPM: 8,900
Prop: 13x6x10 Zinger
RPM: 9,900
Why all the props? Because the darn thing wasn't running right out of the box - only turning in the mid sixes. Re-plumbed fuel tank and lines AND loosened a way-too-tight intake valve. Tried all the props and am running the master airscrew for now. The 14x6 Zinger was best, but it's a loaner. A 14x6 APC is probably the best.
The engine has easy duty just dragging our big [link=http://aeroplano.home.comcast.net/hangar/telemaster.jpg]senior telemaster[/link] around the patch.