Recent content by ddwhitney

TO 00-25-4, November 13, 1943

Attached is a copy of a page from wartime USAAF Tech Order 00-25-4, Engine Time Between Overhaul. The V-1710 was approved for 500 hours, with one extension. Certainly, environmental and operational factors would affect the lifetime of any specific engine. Dan

Attached are the pages from the P-51J NAA Specification detailing design loads. Please heed: Dan

Regarding the XP-51J: North American Engineering Report No. NA-8033, Model Specification for the Model XP-51J Airplane, dated1-1-1944, on page19 says the following about "Structures." Criteria for Design/Flight Maneuver Factors: Design Gross Weight 7,550 lbs, +7.33 g, -3.67 g. Diving speed...

There is a cross-section drawing of the XP-51J on page 187 of Vee's For Victory, I have attached a colorized version. It shows the air intake, taken from the ram air prior to the radiator core. It does not appear that this would have had any adverse effect on the radiator's performance. The...

HP = (Torque * RPM)/5252. At 5,252 RPM Torque and HP values are the same. QUESTION: For Automobile engines the peak torque is usually higher than the torque at HP peak, and at a lower RPM. How is it for Aircraft Engines? ANSWER: Aircraft engines have to deliver Torque to the propeller. It...

There are a lot of erroneous posting in this thread. First, the US Air Corps wanted a double V-1710 to power the XB-15 back in 1934. Concurrent development of the X-3420 and V-1710 meant slow progress on both. When Bob Hazen took over as Chief Engineer in 1936 he got the Air Corps to back off...

TO No. 01-110F-4, P-39 Parts Manual, is available at aircorpslibrary.com, for viewing and/or downloading. Membership is very reasonable.

Go to enginehistory.org for information on X-250.

Hello All, Sorry to disappoint, but ALL P-39s were built with the 34'-0" wing, beginning with the prototype XP-39. The only exceptions were the three XP-39E's, which were highly modified to test the new two-stage Allison V-1710-47 for the P-63. See attached. This information comes from copies...

I'm attaching a drawing from Graham White's masterpiece, R-4360-Pratt & Whitney's Major Miracle, page 474. It gives the ducting layout and shows each engine with a single turbosupercharger, type not given. A couple of pages later he shows the lubrication system for the XF-12, which shows...

I've seen very little to "document" my theory, but by 1942 the Eastern Front was a concern for every man living and working in Germany. A real personal threat! Meanwhile, opposing the Nazi regime was exceptionally dangerous. What better personal strategy could there be than to support the...

To put some fact to fiction and stories I am attaching T.O. 00-25-4, Aircraft Maintenance Procedure and Overhaul of Engines. It specifies the approved TBO for each engine being used within the Army Air Forces in 1942 and 1943. It also identifies the requirements before exceeding the...

I have scanned the 25 pages of GE Type Designations into a pdf. It's a little large. If you have problems contact me and I can send it direct.

Gentlemen, Referring to Turbosupercharger Type Designation Sheets: The Type D was for 1401-1800 HP Engines. The D-1 was the basic unit and rated for 1500 HP engines. The D-2 was the same with the exception that a flange is provided 180 degrees from nozzle box inlet for attaching a waste gate...