Viper .049 kit and Cox fuel

Just found a kit called "Viper" which is a .049 built up fuselage and bought it for my younger son to build and fly. I have never seen it advertised anywhere-has anyone ever built this kit or flown it? Also I have been using the same fuel from my larger engines in the .049 engines which is 20% Lubricant blend and 10% Nitro. Is this okay or should I be using the regular Cox fuel?

The ball socket on the Cox connecting rod needs castor oil, and the nitro should be 15%-25% for general use. I think Cox still uses all castor lube and 15% nitro in their sport fuel.
Don't think I've heard of the "Viper" but it sounds interesting.
Good luck,
George

Is that a Sterling (ESTES) kit? If thats the one it flys ok. Good luck with the quality of wood and thier cut outs. My 2 cents worth. Steve D.

The Viper is a fairly common Sterling 1/2A kit, and should fly just fine. Currell

I have one of the Sterling Vipers and it does in fact go like a bat out of H*** with a Black Widow. As mentioned above the wood was pretty poor and the hardware cheap. A little judicious replacing of stuff would make it a pretty cool little ship.

Mike.. Cox regular 1/2a fuel is(or was) Powermaster 15%..
powermaster simply provided it to Cox in Cox labeled
cans... Tony

BTW, I have been running our Black Widows and Babe Bees on Sig Championship 25% half and half for two seasons now with perfect success. It's readily available locally.