Propeller speeds
Posted: Fri Nov 03, 2006 9:19 am
I have just assembled a model MM-5 engine, coffee cup type, and I
want to know what some of the prop speeds other people have obtained
with the same or similar S. engines. In it's intial run, it seemed
the prop speed was abt 400 rpms, but two subsequent runs (all with
boiling hot water in a mug) seemed to get up to abt 300 rpms for a
few mins. After that, the prop slowed down slightly, abt 200 opr so,
and would run for another 15 mins until I removed it from the mug.
Is 300 rpm a decent speed? Can one go much faster with the MM5? The
initail temp on the indicator was 72F. It works pretty slick.
want to know what some of the prop speeds other people have obtained
with the same or similar S. engines. In it's intial run, it seemed
the prop speed was abt 400 rpms, but two subsequent runs (all with
boiling hot water in a mug) seemed to get up to abt 300 rpms for a
few mins. After that, the prop slowed down slightly, abt 200 opr so,
and would run for another 15 mins until I removed it from the mug.
Is 300 rpm a decent speed? Can one go much faster with the MM5? The
initail temp on the indicator was 72F. It works pretty slick.