Hi Mark,
Sorry for late respons I'm being at the meeting all week. Had all sort of minor problems then big problems with wether. 90 degree wind 8-10 meter per second, so there where no flight with my Mustang. However my good friend Idar from Norway did flights with his C-arf mustang. Same weight( 16,5 kg) as mine but with 3w75 singlespark and german Haboretracts. Flys as on rails, first landing without flaps rather slowly but no tendencies to stall. About the reductiondrive, I have only seen pictures of it on these sites. I don't think he has a site. I'll put in some pics later this evening.
Regards Tobbe