RE: MVVS 2.5 (.15)
OK, I tried the 6.5 - 5" APC. I got 19,900 to maybe 20,000 once in a while. (burned the plug too) Put on an Ucktampipe, and it got to 21,500. It still wasn't really steady enough to run in a plane. Maybe with some pipe pressure and some fiddling. Then I took an OS .15 LA to compare because all my other tests were with the 7 - 5" prop. It does 19,900 to 20,000. What is my conclusion? The MVVS likes higher revs, but is back to the disappointment shelf, The LA is lighter and easier to use/set. I guess a new Turbo head may help things out, but it would on the LA too. Edit- your plane looks real good!