RE: OS.15 CV-A or OS.25LA ???
This week-end I will try two different setup.. 25% nitro, 8X5APC and 7X6APC... and retune the pipe.
Maybe there is something wrong with my settings for this engine. Yesterday I was looking and old video and I can see me adjusting an OS.15 LA on a 7X6 APC prop. On the video I can read the TAC at 17450rpm on .15LA!!! The only mod I made on this engine is modification on the stock muffler. I just enlarge the exhaust hole to the maximum and double the size of the baffle hole. Great sound.
The best I can do with my .15CVA is 17000 with a tune pipe!