|05-11-2006, 11:07 AM||#11|
RCC Supreme Contributor
I am: Dave Holmes
Join Date: Mar 2004
Location: Prince Edward County, Ontario (no longer Brampton!)
Radio of choice:
Futaba 72 Mhz
# of RCs: 30+
Feedback: 4 / 100%
Total Props: 10
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New needle valve and spray bar (bent the original thunking it in), Carb sealed (spent time making SURE) backplate has never been disturbed.
Running Cool Power Green 5% swinging a MA 12x5, and it HAULS!
I notice very little difference between 2/3 throttle and wide open, but I expect that's because the drag goes up exponentially with speed. In any case, 1/2 throttle is fine for me as it's still quicker (and smaller) than anything else I fly. After about an eight minute flight, I'm ready to land whether it is or not. My attention span is being stretched by that time. (perils of getting older.)
Wayne, I shall try and get those numbers and post them.
The older I get, the better I used to be!
|05-15-2006, 01:45 PM||#12|
RCC Pro Contributor
I am: Claude P.
Join Date: Sep 2002
Location: NorthEast BC
Radio of choice:
Futaba 7C and 9C
# of RCs: 20+
Feedback: 2 / 100%
Total Props: 0
I am coming in late as it appears you have it sorted out. But here are a few after thoughts for you.
IMO, a 12x5 MA is a bit of a heavy prop for this engine. Not the pitch, but the heavy and inefficient MA. My ST45 loves the APC props in the 10x7, 11x6, 12x4, and the 12.25x3.75 - the prop I bolt on depends on the plane I have it installed in at the time. For your supersportster I would plug in the 11x6 APC.
I am sure you have been through the whole rotating the spray bar adjustment on the ST carbs? Sounds to me like your midrange is/was rich - where rotating the spray bar would help fine tune things for you.
Finally, what was the age of this engine when you got it and problems started? Maybe you are just now are getting through the break-in. My ST45 took awhile to break in and it was fairly unreliable as well until a good 3/4 galon was through it. Now it runs like a top and with lots of power. Not the prettiest engine I have but one of best running and stronger ones.
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