Bob,
I did'n have to add any weight. However I did move the onboard nicad (8 oz) to beside the fuel tank. I have ordered a Solo adjustable pitch propeller that should be in next week. As it weights 4 oz, I probably will have to move the Onboard nicad back a couple of inches. Plenty of room.
Now to consider addition of smoke........ I had Kelvin at Kelocreations make the exhaust collector and also had him add a smoke coil, just in case :^). Now I've got a blow out in one of the Du-bro inflatable tires and I'm waiting for delivery of it so I can fly again.
Seems like it is always something... By the way, The OS FR300 tachs 7,200 rpm with a 20X8 zinger prop.
Now.......... Tell me about this JET. I been looking but not ready to take the plunge. So tell me about it.

Shep