No joke: 248mph Hurricane dh5-20, 230mph Spit... what on earth is going on??

[NZtyphoon]

Originally Posted by ATAG_Dutch

Thanks Momod. I've done a lot of testing recently, and quite honestly I'm glad other people have 'taken up the baton' as it were!

This is as it should be, the 100oct should only have improved performance up to a certain altitude, which I forget at the mo.

The 100 Octane improves performance up to c. 10,000 feet, after which the boost drops off rapidly. The constant-speed props (de H and Rotol) provided the best overall improvements in T/O and landing distances, climb rate and ceiling.