Hawker P.1121 Question

So the exhaust gasses, exiting partilally in all directons, will try and accelerate the fuselage, and with it the complete aircraft.
Yeah, that's kinda how I read it. That the upper fuselage helped to direct the thrust down and aft. Kind of like a primitive, unmoving form of thrust vectoring.

With rockets I think they call it 'bloom', where at high altitude the gases expand outwards after they exit the nozzle bell. With the Phantom tail configuration about 1/4 of that bloom would be directed aft and downward after it leaves the engine, helping rather than being wasted.

iu
 

Zen9

Banned
If the thrust line from the engines was driving the nose up, then to counter it you'd need to slightly turn the tail to produce a countering pitch down force.
But if the tail was a 'flying tail' then the 'lift' it generates would naturally counter this tendency in the thrust.
So if you could 'pick up' energetic flow from the engines exhaust gases this would further strengthen the matter.

That would help explain the engines nozzles being angled down.

And frankly that makes a long runway TO a nice simple process. Lot's of power get's you up without having to induce drag from tail increasing drag by being angled to pitch the plane up.

Something missing from the Lightning and I suspect the P1121 to turn this back onto topic.
 

SsgtC

Banned
If the thrust line from the engines was driving the nose up, then to counter it you'd need to slightly turn the tail to produce a countering pitch down force.
But if the tail was a 'flying tail' then the 'lift' it generates would naturally counter this tendency in the thrust.
So if you could 'pick up' energetic flow from the engines exhaust gases this would further strengthen the matter.

That would help explain the engines nozzles being angled down.

And frankly that makes a long runway TO a nice simple process. Lot's of power get's you up without having to induce drag from tail increasing drag by being angled to pitch the plane up.

Something missing from the Lightning and I suspect the P1121 to turn this back onto topic.
Not really. It wasn't pitched enough to actually make the nose is the aircraft rise. At least not once it was airborne.
 
It would appear that whilst the wing has a positive angle of attack the tail plane is actually set at neutral so as to have no pitch effect on the aircraft as it leaves the catapult.
 
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