Curtiss XP-40Q (Warhawk)
United States (1943)
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The Curtiss XP-40Q became the fastest of the Warhawk fighter line but still could not match the capabilities of competitors during World War 2.
Detailing the development and operational history of the Curtiss XP-40Q (Warhawk) Single-Seat Monoplane Fighter Prototype Aircraft. Entry last updated on 7/13/2018. Authored by Staff Writer. Content ©www.MilitaryFactory.com
The XP-40Q began in offshoot projects like the Model 87X and the XP-40N of 1943 and each incorporated several modern changes to keep the machine a viable gunnery platform for the foreseeable future. The Model 87X evolved to become the XP-40Q and this endeavor involved a pair of P-40K airframes and a single P-40N.
The first P-40K aircraft was outfitted with an Allison V-1710-121 rated at 1,425 horsepower output and held its cooling intakes at the wings. The engine cowling was redesigned as a much closer-fitting cover to encourage aerodynamic efficiency. All other qualities of the fighter were still rooted in the original P-40 which only worked against the design. This prototype was designated simply as "XP-40Q".
The second P-40K had the cooling intakes replaced by a more traditional, small-area chin scoop and was completed with a more useful bubble-style canopy. The bubble canopy allowed the rear dorsal section of the fuselage to be cut-down for streamlining and as a weight-savings measure. A section of bulletproof glass was mounted inside the curved windscreen for pilot protection. The supercharged engine featured water injection for additional war power output and drove a four-bladed propeller unit over the original's three-bladed unit. This prototype became "XP-40Q-1" in the lineup.
Then followed the third prototype - "XP-40Q-2" - whose only major feature was clipped wing tips to add a slight bump in speed. This quality was also later added to the first prototype.
With the changes in place, the Q-series became the fastest Warhawks of the Curtiss family of fighters, netting speeds over 420 miles per hour (422 mph officially). Earlier marks did not even exceed 400mph. However, this was not enough to compete with the numbers of P-47 and P-51 fighters coming off production lines and were more than ready to tackle a variety of over-battlefield roles. This inevitably led the Q-series to find its end before 1945.
In the post-war period, two prototypes were scrapped. XP-40Q-1 found a slightly extended life as it was purchased for competition flying in the Cleveland Air Races. During the 1947 Thompson Trophy Race, its engine caught fire and the pilot baled - the aircraft becoming a total loss as it crashed in flames.
As finalized, the XP-40Q showcased a wingspan of 35.2 feet and a length of 35.3 feet. It's loaded weight was 9,000lb. Maximum speed was 422 miles per hour with a service ceiling of 39,000 feet. Power stemmed from a single Allison V-1710-121 outputting 1,425 horsepower. The design was never outfitted with armament - its suite proposed as 4 x 0.50 caliber Browning heavy machine guns. This was another limiting weight-savings measure that ultimately would have lacked the punch of its competitors.
Any available statistics for the Curtiss XP-40Q (Warhawk) Single-Seat Monoplane Fighter Prototype Aircraft are showcased in the areas immediately below. Categories include basic specifications covering country-of-origin, operational status, manufacture(s) and total quantitative production. Other qualities showcased are related to structural values (namely dimensions), installed power and standard day performance figures, installed or proposed armament and mission equipment (if any), global users (from A-to-Z) and series model variants (if any).
Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.
Relative Maximum Speed Rating
This entry's maximum listed speed (423mph).
Graph average of 375 miles-per-hour.
Graph showcases the Curtiss XP-40Q's operational range (on internal fuel) when compared to distances between major cities.