MNATION:

With the OS61 the plane is nose heavy. I had to add 2oz to the tail to make it balance and had to use a plastic spinner. The wing load is already high the way I have it, so I would guess that using a tune pipe will make heavier. ABout having enough space on the belly pan I could not say because I have never use one. I have 15 flights on it and it is really good. The vertical performance with a 13x6 is good but is not unlimited. I will continue using other props to use how the engine performs.