PDA

View Full Version : P-47 Rollrate fixed but good... lol



XyZspineZyX
09-04-2003, 07:58 PM
Salute

Initial tests:


At 400 kph using no cockpit view at 10,000 ft. (3,000 m)


D-10 110 degrees per second (too fast)

D-22 99 degrees per second (slightly too fast)

D-27 68 degrees per second (very slightly too slow)


As far as rest of FM is concerned, seems to be very similar otherwise to 1.1b

As far as the too fast rollrate is concerned:

Before the Luftwhiners set up a howl, they should remember that the early Razorback was tested to 85 degrees per second at 400 kph. That at a stickforce of 50 lbs. However, from the charts it seems that that was not a full aileron deflection. And since pilots said the long throw joystick in the P-47 allowed them to apply their full bodyweight to the stick, it seems likely that a greater stick force could be applied and thus a better rollrate achieved. The NACA tests of the D-30 showed stickforce of up to 60 lbs was applied.

Remember also that the P-47 pilot sat upright in his cockpit, unlike the 109 or 190 pilots who were in a reclining position, and thus unable to exert as much force.

In addition, the rollrate at high speeds of this patch version seems to degrade very quickly, and drops below the historical levels. So all is not nessesarily positive for the P-47 jockeys.


Cheers RAF74 Buzzsaw

XyZspineZyX
09-04-2003, 07:58 PM
Salute

Initial tests:


At 400 kph using no cockpit view at 10,000 ft. (3,000 m)


D-10 110 degrees per second (too fast)

D-22 99 degrees per second (slightly too fast)

D-27 68 degrees per second (very slightly too slow)


As far as rest of FM is concerned, seems to be very similar otherwise to 1.1b

As far as the too fast rollrate is concerned:

Before the Luftwhiners set up a howl, they should remember that the early Razorback was tested to 85 degrees per second at 400 kph. That at a stickforce of 50 lbs. However, from the charts it seems that that was not a full aileron deflection. And since pilots said the long throw joystick in the P-47 allowed them to apply their full bodyweight to the stick, it seems likely that a greater stick force could be applied and thus a better rollrate achieved. The NACA tests of the D-30 showed stickforce of up to 60 lbs was applied.

Remember also that the P-47 pilot sat upright in his cockpit, unlike the 109 or 190 pilots who were in a reclining position, and thus unable to exert as much force.

In addition, the rollrate at high speeds of this patch version seems to degrade very quickly, and drops below the historical levels. So all is not nessesarily positive for the P-47 jockeys.


Cheers RAF74 Buzzsaw

XyZspineZyX
09-04-2003, 08:29 PM
Buzz, is it possible you could check the P47 roll rate at higher speeds? Also, do you know what altitude that NACA did their tests at?

Thanks
fscott

XyZspineZyX
09-04-2003, 08:33 PM
Salute Scott

Here is the chart in question. Altitude 10,000 ft, 3000 meters. Don't have time to do testing now.


http://naca.larc.nasa.gov/reports/1947/naca-report-868/42.gif



RAF74 Buzzsaw