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How Low of an Idle?

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Old 08-04-2014, 10:44 AM
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gregoryshock
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Default How Low of an Idle?

I realize that there are various factors that effect reliable idle speeds. Prop sizes etc. I'm curious in general how low of an idle in RPMs does a typical .60 size two stroke glow engine get?

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Old 08-04-2014, 03:32 PM
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jetmech05
 
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Low enough that it doesn't roll
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Old 08-04-2014, 04:25 PM
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Originally Posted by gregoryshock View Post
I realize that there are various factors that effect reliable idle speeds. Prop sizes etc. I'm curious in general how low of an idle in RPMs does a typical .60 size two stroke glow engine get?

Typically 2,500 to 3,000 is about as low as you can get reliably.
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Old 08-04-2014, 08:04 PM
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Originally Posted by jetmech05 View Post
Low enough that it doesn't roll
So all this time I have been fiddling with my idle when instead I should have been messing with my wheels.

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Old 08-05-2014, 04:18 AM
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Seriously you can have a low enough idle that you'll dead stick in flight as the prop unloads and loads. My rule of thumb is low enough not to roll. On grass I let my wheels pretty much free spin. On asphalt I set my wheels to drag some
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Old 08-05-2014, 06:22 AM
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Depends on the engine too. OS engines can get down around 2200 reliably, while the cheaper Chinese engines like Magnum generally won't. That may not be a matter of quality though, since Magnums have more compression than OS's do and therefore it's harder for the momentum to push the piston past the top reliably.
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Old 08-05-2014, 11:40 AM
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I have always flown from a grass field, so rolling has never been a problem. I set my idle for maximum reliability. I cannot recall the last time my engine stopped because the idle was to low. I do see a lot of people making dead stick landings, with plenty of fuel in the tank. A lot of people seem to believe a very low idle is a good thing. I'm not one of them.
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