AS for the diesal and the best he could get was almost 3 hrs he used a os 40 with a brown head on it he had the crank break at 2hrs. then the next flight at 2 1/2 hrs it just quit no reason at all the 3rd try broke the crank . he has the fuel economy but reliability is the down fall of this combo maybe a engine made for diesal. he had to order fuel in and boy did it smell the place up. as for a group to work on this it me my self and all of you who send any input I already have the names on a list to but on the plan