Spirit of Hope wrote:The idea of VTOL jet transports has been played with before but not adopted.
A number of issues exist that aren't addressed by your proposal.
First the V-22 only has 6,000kg of fuel storage, which is similar to the fuel storage for the F-35B. However you would be running two engines off of that fuel storage instead of one. Your range would probably still be better than a helicopter, but it wouldn't be 800 miles vs 200. Increasing fuel storage increases range, but decreases payload.
Second although you will have the engines of a supersonic aircraft that doesn't guarantee your transport will be supersonic. The shape of the aircraft plays an important part in aircraft speed, and it is hard to design a transport while keeping the shaping required for high speeds. Again you will be faster than a helicopter but not jet fighter faster.
Third the total load an aircraft can internally load is separate from the load it can lift. The hull has to be designed to hold that load as well, carrying an APC is going to require additional reinforcements that increase the weight of the aircraft, and decreases the usable load.
Forth VTOL in a jet does not mean land in any clear field, you would likely be limited to operating on improved runways. This is an obvious draw back vs a helicopter, and limits the viability of using such a design for casualty evacuation or air mobile operations.
I feel like I pretty much addressed all this. I even mentioned the part about needing twice as much fuel. None of these are major obstacles or a reason why it can’t work. Further when you consider something like this could be far better but comparable in cost to the CH53k, it starts to make more sense. The particular role could be fulfilled by something faster and with a bigger payload, without much obvious drawback.