engine surges when holding airplane vertical - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-11-2004, 11:16 AM   #1
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engine surges when holding airplane vertical

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Before each flight, I hold the airplane vertical (to ensure the engine won't quit) - you guys know the routine I am sure. Anyway, sometimes when doing this, the engine surges (drops and then gains rpms repeatedly). The engine does not die, it just keeps on surging. If the needle valve is set correctly, and the needle valve does not have any dirt in it, and the fuel is good, what would are other things I should look for? This is a VMAX .46 (made by VMAR). Thanks.
Colin Jensen
Regina Windy Flyers
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Old 07-11-2004, 06:05 PM   #2
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Replace the glow plug, check for kinks or holes on your fuel line. If you run fuel filter, make sure the filter is clean. Clunk line is where it supposed to be..
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Old 07-12-2004, 04:45 PM   #3
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you can also make sure that your carb is in good and tight , check the O-ring on the base on the base of the carb aswell it should be a good snug fit.

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Old 08-08-2007, 10:08 AM   #4
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Go a couple clicks richer. Worked for me.
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Old 08-08-2007, 02:47 PM   #5
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When mine surged like that (os 1.08 ) , it was because it was too lean. Richened it up about 1/2 turn. No more surges.

Easy to lean it out too much I found when trying to maximize rpms. Don't be stingy, give it some more juice. It'll run like it's supposed to.
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Old 08-08-2007, 02:59 PM   #6
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Agree. Too lean. If it won't richen up properly with the needle, then you have an air-leak as mentioned above.
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