Bf 109E rate of roll

[Juha]

Thanks a lot, Graham, greatly appreciated!
I have the formula somewhere but where? Now I'll print a couple copies of Your answer and archive them relevant but different places plus I'll take a couple copies of it on my harddisk. So I probably will be able to find it when the need arise next time.

Thanks again
Juha

[Juha]

So, thanks to the conversion formula given by Graham it seems that around 300mph (480kmh)IAS/350mph(560kmh)TAS the rollrate at 10000ft of the Bf 109F-4 used in the DVL's test dropped lower than that of almost all of the fighters used in the NACA’s test shown in the 3rd graph posted by O. Menu. That if I got all right. So not so impressive result after all.

Juha

[George Hopp]

So 310 kts IAS at 10000ft is 361 mph
375 mph at 10000ft is 436 mph

A small point, but I assume you mean mph on both lines, rather than the "310 kts."

[Juha]

I refined my rough calculations a bit. The earlier was based only for the time of a full roll of the Bf 109F-4 used in DVL's test but if we suppose that the Bf's rollrate accelerates to full rate during the first 45deg (this is made only because I have info only for time to first 45 deg ,unfortunately for a 109E as shown in the first graph posted by O. Menu but according to Raunio, op. cit, also G-6 took the same time (4sec) at a little over 600kmh to achieve 45deg , (Raunio doesn't give his source) and the time for a full roll for the 109F-4. And also to keep the maths simple). So the according to this refined but still rough calculation it was around 325mph/523kmh(IAS) / 378mph/608kmh(TAS) when the rollrate at 10000ft of the Bf 109F-4 dropped lower than that of almost all of the fighters used in the NACA test and at appr. 375mph/603kmh(IAS) its rollrate is the same as that of Typhoon which had the clearly worst rollrate over 330mph(IAS) among those fighters used in the NACA test (Zero's measurements seemed to stop at 330mph(IAS)).
OK this is my last calculation for a while!!!