Hi Kenny,
I never owned a Cosmos 60 (though I have a kit in my collection), but I did put 6 flights on a friend's Cosmos at a pattern contest in 1985 (the frequency I was flying on had serious interference issues - I know, I tried to fly and was LUCKY to get my Joker back on the ground intact after some VERY scary moments). The Cosmos I flew was powered with a YS 60FR turning an Asano 11x9 prop. The airplane flew great and I almost beat the owner with his own plane. The Cosmos is the immediate predecessor to the Aurora also designed by NAruke who is a 2 time FAI F3A world champ (won twice in the '90s). The Japanese design beautiful airplanes and are terrific builders.
Enjoy your Cosmos!!
-Will B.