Hi there,

What kind of RPM numbers should I expect to get on a 1cc engine like this with a 7/4 prop? I just want to make sure mine is running OK when I get it going later.

Thanks
Warren

Hello again,

I ran it a bit earlier (after about 4 years of sitting) and I had forgotten how much fun these little open exhaust engines are. I doubt the neighbours are too pleased, but I had fun!!! I couldn't find a 7/4 prop, so I used a Graupner 6/4 instead and was getting around 13600 RPM.

Does this seem about right?

Thanks
Warren

Hello again,

I ran it a bit earlier (after about 4 years of sitting) and I had forgotten how much fun these little open exhaust engines are. I doubt the neighbours are too pleased, but I had fun!!! I couldn't find a 7/4 prop, so I used a Graupner 6/4 instead and was getting around 13600 RPM.

Does this seem about right?

Thanks
Warren

13,600 on a 6*4 sounds about right. I usually run my 100 on an 8*4 and get 8-9,000 rpm. Is yours a ball-raced engine?