Hot answers tagged


For the F135 engine in this photo, thrust in hover is only about one per cent less than maximum thrust, if Pratt & Whitney's data sheet is to be believed. Maximum Thrust Class 41,000 lbs ... Hover Thrust 40,650 lbs The Hawker Harrier's maximum thrust was about 20,280 pounds. An approximation of its maximum vertical thrust at low airspeed is given by ...


A 90 degree bend in a pipe where the radius of the bend is of order ~one pipe diameter creates the same pressure drop as a length of that same pipe of order ~ten to fifteen times the pipe diameter.


In this video you can see it better I think: I drew on a screenshot of the video from the side where you can see the air moving under the aircraft. Compare this to the Fig. 1 in the paper linked by "Anonymous Person" here in the comment section of your question:


Draw a line from the leading edge to the trailing edge. This is the chord, and it has a positive angle of attack as the shape is oriented. Therefore your premise that this has zero angle of attack is incorrect. Since you can produce lift with a positive angle of attack using a flat plate, it is reasonable to assume that this shape, as drawn, should produce ...


F35 and Harrier are both single engined. Both had a forward fan providing lift through this fan, and in case of Harrier forward nozzles turn aft for thrust. F35 it provided lift only. Aft nozzles in both types vector to give lift or thrust. In Harrier all nozzles are synchronised, So silence from the engine means it's time for the black and yellow handle....


Would definitely create some lift if flying supersonic ;) Otherwise, sharp edges force the flow to detach and thus destroy any lift capabilities of the shape.


You won't be measuring any static pressures because facing the transducers into the sense direction produces dynamic positive pressure which is not subject to temperature compensation or air density corrections at altitude. A Vertical Speed Indicator works by taking static pressure and a calibrated leak inside the instrument to show your climb rate. You can'...


You’re right. V/STOL and STOVL are one in the same. It would probably be better to consider the term STOVL more of a mission profile than an aircraft capability. All powered lift aircraft eg Harrier, F-35B, etc. are capable of vertical takeoff and landing within certain weight limits. They are not capable of vertical flight outside this. The directed lift ...


V/STOL and STOVL are as much operational modes as types of aircraft. In V/STOL, the aircraft is envisaged as sometimes taking off and/or landing vertically and sometimes using a short runway, adapting its mode of operation to the job in hand. Some hybrid and compound rotorcraft can operate in STOL mode as well as VTOL. In STOVL, the aircraft is envisaged as ...

Only top voted, non community-wiki answers of a minimum length are eligible