Yak, it is SuperSonic I think. I got the engine with the muffler and the seller on RCU told me he got it from RCShowcase as an option so I assume that is what it is. However he told me it was a Slimline muffler and RCshowcase does not offer slimline for the ROTO 25. So which it is I am not sure. To me it looks like a Slimline as I have Slimline mufflers on other nitro engines. Still he said he got it from RCShowcase......
RCShowcase does not show a picture but the URL is here for the muffler they offer:
[link=http://www.rcshowcase.com/html/accessories/mufflers.html]http://www.rcshowcase.com/html/accessories/mufflers.html[/link]
Scroll to the bottom for ROTO 25 and it lists a SuperSonic.
When I check the Slimline web site I do not find the ROTO 25 listed but if it is a slimline then it must be the same bolt pattern as another engine they list.......
Slimline is here:
[link=http://www.slimlineproducts.com/]http://www.slimlineproducts.com/[/link]
Sorry I could not answer you properly but I am just unsure.
Bob
ORIGINAL: Yak18
Finless. your installation looks terrific. I think the Roto 25 is just what I need for my GP Ryan STM. Is that a bisson muffler you have installed? I need the narrowest engine/muffler package I can get.
Thanks, Yak