I had a D-A .15 diesel back in the 1950's. It went onto a first release Goldberg Shoestring profile. I was 'just a kid' back then, so it flew on TopFlite 10-6 wooden props, and about 60' of 0.018 cable lines. ...On a black U-Reely... Fuel? Two commercial fuels were available: OK Cub and McCoy - since they both sold small diesels then, too. Later, found some tech ether and brewed my own, pretty much 1:1:1 blend. Worked great!

The Shoestring Profile is about the size of the TF Flite Streak - fairly large and draggy for a 2.5 diesel, more so on such a prop and such heavy lines. Never pulled real hard, but never fell into the circle, either. Did the stunt pattern as well as I could then, anyway. Laptimes were leisurely, possibly 6.5 to 7 seconds. Wingovers, in particular, were a trip.

Nice purring steady sounding level flight...Pulled up to vertical and the engine "pooted" once then settled back to usual. About 4 seconds later, turned from vertical back to horizontal (eiher way!) and it again "pooted" once. Didn't seem to change its 'tone' on smoother maneuvers, but I don't recall whether it did anything odd on square-figure corners. But, again, it hung out there very dependably througout the flights...

(Translator's Note: For anyone unfamiliar with the term "poot" it is a way to describe a clearly audible flatulence. Oh, well, call it what is was - a loud fart.)

You should have a good time with the Blue Pants and a better combination of lines, prop and fuel!