RC Kowal..a name from Michigan which intrigues me!!!My flight instructor at Grosse Ile in 1943 was Ensign Kowal..originally from Iowa, I believe.!
All 5 of my Ascents use 6/3 CAM folding props & Nimh or Lipos . With 8 Nimh I can get 60 minutes of LOW throttle flying. Li-pos are as good or better.
I modify mine with all-flying horiz stabs..and Rudder placement ahead of stab.
I think this is best sailplane for the money. All wings, tail, stabs MUST be free of twists & warps or you have a wild ride!!!
Pix of my mods available if U wish.
Norman