Stability and Control characteristics of the Early Mark Spitfires

[Crumpp]

NOT ONCE does the author refer to the ARC papers from 1937 through to 1939-48, nor does he have any references concerning British research during the war years, instead concentrating almost exclusively on American aeronautical research - he had no idea of what sort of development the British had put in after 1913: this one is busted.

Why don't you post the ARC standards.

Here is the NACA standards adopted during WWII. The USAAF and USN used these as the basis to define their own standards by 1944.

Until those individual service standards were adopted, they used the NACA's.

One impor-tant contribution made by the NACA in this area was its famous technical report, No. 755, "Requirements for Satisfactory Flying Qualities of Airplanes." Representing a decade of work, the NACA introduced to the industry a new set of quantitative measures to characterize the stability, control and handling qualities of an airplane. The military readily adopted the NACA findings and for the first time issued specific design standards to its aircraft manufacturers. It is a classic example of the partnership between the military, air-craft industry and the NACA.

http://www.nasa.gov/centers/langley/...s/WWII_prt.htm

End the speculation and just post the standards during the war for the ARC.

Thanks!!

[Crumpp]

Here is the USAAF and USN standards adopted in 1944.

During October 1944, the National Advisory Committee conducted a series of conferences with the”Army, Navy, and representatives of the aircraft industry for the purpose of discussing the flight-test procedures used in measuring the stability and control characteristics of airplanes. The conferences were initiated by the Army Air Forces, Air Technical Service Command, to acquaint the flight organizations of the industry with the flight
test methods employed by the NACA and to standardize the techniques insofar as possible as they are employed by the various manufacturers and agencies engaged in determining the flying qualities of airplanes

NzTyphoon will share the ARC standards with us shortly!

[Crumpp]

I have Spinning was permitted if pilots were authorised by the CO or CFI at the OTU level.

What is the date on your Operating Notes that reference the spinning permission thru special training?

[IvanK]

Not special training just authorisation.

Issue Date July 1940 Revised Dec 1941 and Amended up to Al No 25K which was added according to the AL sign off sheet as Aug 1942.

[Crumpp]

Aug 1942

Ok, that is after the inertial elevator was added to the design.

[IvanK]

Inertial elevator ??

Are you referring to the bob weight in the pitch circuit or increased balance area on the elevator as fitted to MKV's ???

[DC338]

Can I ask for your analysis of figure 16 17 & 18 of the NACA report? It seems figure 15 was an anomaly when compared to the next 3 which where doing similar test?

Someone (whiny?) earlier quoted a report from the morgan book on the Spitfire about inertia weights being not required for the MK I & II as long as the rear oxygen bottle was removed. Would be interesting to see the full report.