Well I guess that this is the forum to ask this. I want to know just what the nitro does in the fuel that we use. In a full size engine NO2 is used but it doesn't burn. It displaces the 20% oxygen air with 66% oxygen NO2. This creates a denser charge and the O2 is freed during combustion. This makes the mixture go very lean and is why you must add fuel at the same time when using NO2.
Now in model engine usage, little or no nitro is actually needed to run. We really burn the alcohol. But it is "nitromethane", so I believe that it does burn. In an article I found on the internet, it states that the glow plug ignites the mixture by a catalytic action between the methanol in the fuel and the platinum on the coil of the plug. If this is true then I then believe that the nitro is just a combustion enhancer.
Stepping up in nitro means that you need to richen your mixture. To me this mean that we do not depend upon it to run. Now i'm back to it being a combustion enhancer.
Can someone shed some light on this for me?