[Kurfürst]

Originally Posted by Kwiatek

Sry but i dont see any conection with these both raports.

Hmm, both reports are made by NACA, both reports are authored by William H. Philips. The first (Spitfire MkV metal ailerons) report dates January 1942. On page 13 it says that at 6000 ft altitude, 30 lbs stickforce, 59 degrees/sec was obtained.

The second (P-40 Hurri, Spit P-36) dates November 1942. Again made by NACA, both authored by the same William H. Philips.The roll chart of P-36, Hurricane, P-40, Spitfire shows ca. 65 deg/sec at 10000 ft altitude (as opposed to 6000 ft in the first report), 30 lbs stickforce. The report also references to NACA 868, the well known lateral control characteristics summary report, which notes that roll rate increases with altitude, and gives the neccessary conversion methods.

Quite simply the second report uses the figures obtained on the Spitfire Mark V with metal ailerons, tested by NACA earlier, and converted it to 10 000 feet.



First raport is about Spitifire, Hurrciane, P36 and P40 - with not detail about types and no detail about type of airleons - if it was fabric or metal ones.

Second raport is clearly about Spitfire MVA with metal ailerons - but as i said i dont see conection between both raports.

Very poor roll rates of Spitfire from first raport suggest that it was with fabric covered ailerons.

Its an assumption, but no, both reports show the same Spitfire with metal ailerons. In fact both reports show the same roll rates obtained.

These confirm second roll rate chart which i posted with Spitfire MK V with metal airleons where roll rate is clearly improved over fabric covered ( from first test).

Indeed the roll chart you posted for another Spitfire Mark V tested in the UK shows far higher roll rate than any other test result or source, UK or US. Its a pity we do not know anything about this Spitfire, but it seems this aircraft was either extraordinary good in this regard, or it had some non-standard aileron setup. We can only guess.