Two Thumbs up for the Tower .75 ! I've been running one in a GP Shoestring, mounted horizontal with an APC 12x8, Bisson muffler. Engine fits inside the cowl without cutting it, and does not overheat on 15% nitro. The .75 has been rock solid, transitions great and even shuts off when I ask it to. Pulls the 8 pound Shoe around well, radared at 106 a number of times. If you get one of these, just give it a correct break-in
like the mfr. describes ,seal the carb to the case with RTV , and you will be rewarded with a very reliable and powerfull unit.