The Glow plug is a OS type and it's a number 8.
The fuel is 16% Nitro with a 10% synthetic oil and 8% castor Oil.
I have found out the reason why the Helli shook and came down to earth, it was due to the motor slowing down and it then had a slow rotor speed.

I took the motor out and flushed the carby and motor in Metho. I assembled it and still it would not lift off... Grrrrr.
I did exactly what the manual said and had the needle 3 turns out and it was blowing smoke and running fine for a week. It will start but when it comes time to lift off tye blades just slow down and it starts to shake again... Maybe I have gotten a bad motor.?

Tony