Very cheap in the UK: 69 pounds
http://www.sussex-model-centre.co.uk...Engine-940.htm

Swill,

Your engines RPM number indicate the optimum prop to be an APC 16.5x11 (APC 16.5x12 -> repitched to 11). Another consideration would be an APC 17x10N, the prop chart shows it to be at the high end of the load, but still capable of 8400 rpm.

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Schpankme

Got verry verry broad needle.

Seems to be my problem as well.

How much should i cut off the header..,

got mine for 155 pounds. thats for engine, header and tune pipe

Runing it with a 15 -12 at the moment doing 8400 rpm but it can do more because it was not on idle verry well [&o]

Thunder Tiger PRO-120-RP

Thunder Tiger 'original" Tuned Pipe + 40mm (1.6")

Nitro 10%
Synth Oil 15%

APC 17x12N @ 7900rpm

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Schpankme

Thanks for all the good info. How long is your total assembly length, measured from your glow plug to the end of your pipe?

Thanks,

DWH

Test ran my new engine with a MA 16x10 with straight header, no pipe and was turning 9030 rpm. Plan to be using an APC 16x11. Had some problems with middle range being rich, but will wait till I have the pipe on before I start tweaking the pump.

I will be using mufler tuned pipe for os 90.. will it be enough? that's the only pipe I have, and I like to start the engine in two days.. need to run it -in before practicing f3A leo 110

thanks in advance for your answers guys

nubli