Basically my question is as simple as that. How do you avoid flooding the engine in the first place. And what should I do when the temperature outside is cooler. Does the amount of nitro make a difference?
-Eric

The engines are all different, you need to become familiar with what you have.

What would be slobbering and flooded on an OS 46 is just nicely wet on a Saito, and the Saito starts fine. The OS would probably want the plug pulled to clear the engine after the same prime.

It all comes with experience and familiarity.

Bill.

Do not mount the tank too high. The centerline should be level with or just a little higher than the spray bar in the carb. When refueling, (depending on your tank configuration) if any pressure tends to build that sends fuel to the carb, make sure that the throttle is all the way closed. This will slow down any siphoning into the carb.

Yes, engines tend to need a little more nitro in the cold months..... if it is so cold that they do not want to start or to idle right.

Best of luck!

Ernie

For engines to run the methanol in fuel has to vapourise to mix properly with the air so that it can burn explosively.

At cooler temperatures it does not vapourise as well. I think the point for the is about freezing point or just above. Sure someone knows this better on here.

The idea of adding nitro in cold weather is that the methanol can burn with the nitro instead, so therefore does not need to vapourise. Apparently petrol can do the trick as well, but never tried that or seen it done.

Once the engine is started of course it heats up so there is no longer a problem. The problem only exists for the first few revolutions, the temp only has to go up by a few degrees.

I've never had a problem running in cold weather with only 5% nitro, so would say no need to increase unless you run on straight fuel.