After putting in an SAITO 80 4cy and getting the plumbing sorted out, it was tested in flight successfully and only a little problem was had with the landings and takeoffs - LIKE THEY WERE squirrelly !!! Since it has only a tail skid like the real DR -1 it also flys the same - all over the place with the pilot chasing the tail all over !! EASY fix - just install an extra wire up thru the tail skid into the bottom of the rudder - bend it to shape and epoxy it into a slot cut into the bottom of the rudder 1/2 ". The skid will steer with the rudder and you'll have to tell people what a good pilot you are since your DR -1 goes straight down the runway !!