JayS wrote:Its more efficient to produce lift by using thrust to increase speed. Thrust vectoring is rather inefficient way of getting lift. None of the VTOL aircrafts have TV merely to assist it in STO. On contrary, STO is used to increase TOW when VTO is not a necessity. Basically Ramp is to help reduce need/extent of TV, and not the other way round.
The video shows an F-35 using thrust vectoring to do a short take off from a ramp. Would it be taking off any sooner if it had no TV?
The answer is surely a function of the load it carries, drag, angle of whatever..etc.
I am aware the redirection of some momentum from forward to downward entails a loss due to the conversion.
JayS wrote:And you cant just TV at the fag end of the jet. It will pitch up the jet violently.
We are in the age of self-attuning PID controls my man.
This isn't the case of a pilot cranking a hydraulic stick in the cockpit to vector the nozzle like he's flying a WWII plane.
What I'm thinking of is adaptive TV where the computer continuously calculates & adjusts the optimum vector angle as the aircraft moves down the runway.
The nozzle is not going to be stuck at angle theta all throughout the takeoff.
Rather the computer adapts the TV to the change - which i believe is what the F-35 does at all times.
The objective is to maximize both speed & lift by trading one for the other as needed.
JayS wrote:Plate deflectors are very inefficient. You will see high loss in thrust.
This would be just a proof of concept.
But before all this, someone needs to calculate whether this idea is even practical.