Thanks for the info Jimcasy. I'm using an O.S. 70x4 stroke. I know odd choice for power but it will give me enough thrust untill I know that the thing fly's then I will buy an easyer to conceal engine. Unfortunately I designed my B-2 with the engine in the nose. Like some fighters with the engine in the nose. I thought that having thrust on the nose and drag at the split rudders there would be stability but I can see what you mean by saying it would be best to have the power on the tail. I couldn't get it to balance out any other way and I couldn't afford a $4,000 turbine.