Hi John
I,m using the Graupner Booster in my F104 ,flies it with great strenght and the throttle responce is very quick fuel enconomy is also very good with 8 9 mins on 3 L of fuel. I,m in Florida at moment flying a Booster 160 at a local feild in a big Boomerang XL pushes this very easly. Mine in the starfighter makes 17.4 kg of thrust thats 38.36Lbs at 123,000 rpm this was tested at the GTBA testday in England in November 2006. any questions phone me +447976281655 they are priced at 3350 euros inc tax