I have a friend who tried one of these with a FPE 2.4...sure sounded neat, but the YS 1.40 he had on the plane before made it fly a bunch better. And the gasser liked to shake things loose. He's building another one (gravity stinks...), and is putting the YS on the nose...and his old FPE is now on the nose of my 25% Cermark Sukhoi...Balanced perfectly without any weight added...gotta love planes with a short nose...

Mark