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bob27s -> RE: got a jett 90 LX with alleycat..need exhaust ext? (11/14/2007 3:18:08 PM)
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Hi Jeff...
Fuel : regular 15% fuel....... just your usual castor/syth blended sport fuel is fine.
Prop: APC 11x8 on that engine/aircraft. Everyone flying the LX on a toni or alleycat came down to that same prop for best performance. An 11x9 works ok too, and a 12x6 works great as well if you want to give up a bit of top end speed for better take off and climb performance.. or if you fly at higher altitudes. Any prop of your choosing that will permit the engine to turn "over" 14,000 peak ground rpm is fair game. Find peak rpm briefly, back off 600-700 rpm from that for flight.
A few things on that engine install though.....
1) make sure the fuel tank is 100% padded... not touching anything.... or it WILL foam the fuel. Quite a few alleycat owners went with bubble-jett or tetra bubbless fuel systems to avoid any potential problem.
2) mount the remote needle valve on the airframe. Remove it from the engine, bolt it to the firewall. Makes for a nice installation, and it also avoids a potential fuel decavitation and micro-bubble issue when using regular fuel tanks.
3) Hot glow plug - Rossi 3, MC56, K&B1-L are good starters. The OS-F plug has also proven to be VERY good in this engine.
Bob
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