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Drones, the Air Littoral, and the Looming Irrelevance of the USAF



The Valkyrie and the targets from which it evolved succeed because they are stripped of everything but the essentials. And they are punted into the air by rockets which are left behind on the ground. That means that the engine doesn't need to be as big as it needs to be if it is trying to get the aircraft to altitude by its own sheer brute force. The engine can be smaller, reducing weight and drag, and the fuel tank can be smaller, reducing weight and drag. Range and endurance are increased as a result. As is cost.

Launching is from a ramp that can be towed behind a pickup truck. Because the rockets are doing all the work there is no need for pneumatics, or rubber bands, steam or electro-magnetic rails. Again, weight, cost and complexity are reduced. And the need for a runway is eliminated as well. So the Valkyrie can be launched from a parking lot, a truck, a train or a ship.

Landing is by means of parachutes and air bags. Assuming a JPAD type capability then the parachute can fly the Valkyrie back to a pre-determined pick-up point for reconditioning, rearming, refuelling and reuse.

The lack of a landing gear also reduces weight, complexity and cost.

I think, in terms of an effective, least-cost solution, Kratos is onto something.

Which leaves me puzzling over these bright ideas...




Why would you waste the effort to develop runway dependent solutions that increase vulnerability, decrease deployability, decrease range and increase cost?

Is the Air Force that wedded to its runways?
 
600 km/h VTOL Quadcopters


In the thread above I wondered about the practicality of VTOL jet powered drones. The complexity of the engine, the need for thrust, the weight, the heat effects on the launch surface - all suggest to me that sled launch with rocket assist is a more efficient method of launching a jet powered system.

But VTOL drones that don't rely on jet engines exist in large numbers. Usually lifted by electrically driven propellers. Unfortunately those aircraft rely on their props turning to keep them in the air. They get little or no assistance in lifting themselves off the ground in the way that their fixed wing brethren do. That is why fixed wing solutions are still popular, they stay in the air longer, and an added benefit is they are quieter.

The same company that is promoting the jet powered XBat VTOL developed the increasingly popular VBat VTOL. It uses a 2-stroke diesel to power a ducted fan to lift the drone off the ground efficiently with no hot wash. And almost immediately after it breaks contact with the ground it can transition to horizontal flight and gain lift from its wings. The ducted fan then can throttle back and become an efficient pusher.

....

In the same vein these new electrically powered high speed drones are incorporating more lift into their body designs, the rotor supports become X-Wings for example. And they seem to be getting faster. 600 km/h is about the maximum speed of a WW2 Spitfire or Mustang. Tactically significant in the drone wars. And the concept minimizes the amount of infrastructure required. It can be launched from just about anywhere.
 
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