By Tommy H. Thomason

Sunday, April 1, 2018

Kneeled Deck Parking

Kneeling - it seemed like a good idea at the time. The U.S. Navy's first carrier-based jet, the McDonnell F2D-1/F2H-1 Phantom, had conventional folding wings to maximize the number that could be parked on deck or in the carrier's hangar.
At some point (and this is not an April Fools joke), possibly suggested by Grumman as shown in one of their brochures, the concept of kneeling gained favor:

A "parking dolly" would be inserted under the nose and the nose landing gear retracted so the tail was raised.
Once the pilot had taxied out of the pack while kneeled, the nose gear would be lowered and the parking dolly removed.
The primary benefit was to direct the hot and powerful jet exhaust above airplanes and deck crew. According to the Grumman brochure, there were other benefits as well.
It also made deck parking compact enough that wing folding was not absolutely necessary, reducing structure and system complexity and eliminating the weight, cost, and maintenance burden of that feature.

The Bureau of Aeronautics liked the idea so much that it was a requirement for the next round of Navy carrier-based jets. Ironically, Grumman didn't receive a contract.

The North American FJ-1 Fury's approach was to stick the "kneeling dolly" into a socket in upper strut of the nose landing gear after opening an access door in the forward-facing nose gear door.

 Don Hinton Photos

 I'm not sure what the "guard" was for. It is too flimsy for protection from the arresting gear cables. My guess is that it was to keep the nose wheel from hanging up on something in the wheel well as it pivoted and unpivoted to lay flat. In any event, it appears to have been added after the surviving FJ-1s were assigned to the reserves.

The nose gear was then retracted using a hand pump.
 The Vought F6U Pirate's "Nose Parking Wheel" was inserted into a socket on the bottom of the nose just forward of the nose wheel well.
 Indicative that the primary purpose of kneeling was the redirection of the jet exhaust, kneeling was also required on the McDonnell F2H Banshee procured in the second group of carrier-based jets even though its wings folded, unlike those of the FJ-1 Fury and the F6U Pirate.

Vought considered partially retracting the nose gear to kneel its Model 346A, which became the F7U-1 Cutlass, but decided that since it was tailless, overlapping its nose over the wing of the airplane in front was adequate.

The Banshee's kneeling capability continued in production for a while, as evidenced by this F2H-2N photo.

However, kneeling appears to have rarely, if ever, been utilized operationally and was not required of the next generation of carrier-based jets, including the Grumman F9F Panther.

No comments: