Just had a speed test in the Rotol Hurricane. Couldn't get more than 230mph ASi out of it, trimmed, level flight, at various RPm (best 2650). According to this:
http://www.wwiiaircraftperformance.o...rricane-I.html
I should get 261mph with the Rotol which is 290mph TAS. So, only missing 30mph, and that is WITHOUT the further 20-30mph I should be getting with the tit pulled for 100 octane.
50mph too slow @10kft