stunthanger.com
Engine basics => Engine set up tips => Topic started by: John Rist on October 13, 2014, 03:12:33 PM
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What is the down side of using an RC engine with the carb wired full open? ST NVA are getting harder to find. I have an almost new O.S. 55AX ABL on a RC ugly stick that I would like to put on a stunt ship that used to have a Super G51
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They are heavier than normal stunt engines for one. NVA's can be got from Tom Dixon and several others on this forum.
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John,
I've had pretty good luck wiring the R/C carb open on a couple of different engines. I don't wire them full open, but rather set the mixture while fully open, then reduce the opening to get the RPM to about 10,000 with a medium pitch prop. Typically the carb is then only about 1/2 open. I leave this setting and change props to get the flight performance I want. I only fly for sport, not competition and this has worked well for me. Typically one flip starts and almost never have to change mixture settings.
Paul
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Due to leakage around the rotary barrel (etc.), I would expect less consistency and more frustration. You might clean and seal over all the possible leaks with silicon sealer.
The other problem is that if you crash, the carb will increase the likelyhood of crankcase damage (more leverage), and if you have to repair the carb, it will be more expensive and more specific parts needed. If you change to a venturi and a ST-type NV Assy., you can generally use about any other .156"/4mm spraybar and NV assy, the venturi isn't likely to be damaged, and the crankcase is less likely to be damaged. y1 Steve