RCU Forums - Engine rpms

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dany_maia

07-20-2003 09:47 PM

Engine rpms

Hello to all.
I have a new OS 120 Surpass 3 with about 1/2 gallon of fuel through it. Fuel is 18% Klotz Super Techniplate and 10% nitro and I have OS type F glow plug.
I can get 2200 rpm idle and 8800 rpm full throttle with a Graupner 15-8 prop. Does this rpm are OK or should it get some more? (the transition is excelent)

Thanks in advance.

Dogz	07-20-2003 10:12 PM

Engine rpms

I have a freind down at the field with one, He runs 20% nitro and run a 16/8 apc prop and run 17/6... you prop seems a little small.

you should pull 8500 - 9000 with a 16/7

dany_maia

07-21-2003 08:54 AM

Engine rpms

Hi.
First thanks for your reply.
I don´t have enough ground clearence for a 16 prop so I use a 15-8. The OS manual says that this is one of the recomended props.

Sprink

07-21-2003 09:05 AM

Engine rpms

Graupner props load up a lot more that APC, so it sounds OK to me.

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