J-15 carrier fighter thread

[Air Force Brat]

I suppose it depends on how advanced the FBW and autopilot systems are and how much control you want to give over to it.

I think it should be perfectly possible to design the FBW and have an autopilot setting where the plane automatically aligns its wings to be level with the carrier deck if it doesn't receive overriding direct pilot input.

In order for this to work, you first need a stick with force feedback, which can be partially disabled and set on the fly.

That means you need the ability to de-couple the stick from the position of the plane, so that you can leave the stick in the neutral position in the roll axes while retaining full pitch control so that the stick doesn't move in the roll axes even if the plane itself does.

That will allow the pilot to only need to focus on pitch, yaw and airspeed, taking the most difficult, roll control, out of his hands.

Its easy enough to set it so that moving the stick in the roll axis, out of the neutral zone will override the autopilot, at which point the pilot will again have full control authority without having to take his hands off of the stick or throttle or even push a button.

For quick movement inputs from the pilot at and after this point, the FBW would retain full responsiveness of the stick to give the pilot maximum control. Once pilot input speed falls below a certain degree/second threshold, the FBW could introduce some slack into the stick responsiveness to seamlessly re-allign the stick position with the plane attitude again.

Or at least that's how I would design the system as the best compromise between automation and responsiveness.

You're both right of course, it all passes through the FCS, all the flight instrumentation feeds into the FCS roll, yaw, angle of attack and I would say the antennae are actually feeding that data back and forth to a radio transmitter on each side of the ship. The aircraft in fact follows the roll of the ship with a rate of roll and feedback, once the roll of the ship proceeds to reverse as the natural righting of the hull, the aircraft FCS is instantly aware of same. So the important aspect is that the aircraft/ship are interfacing with one another, the pilot can relax and monitor adjust pitch or roll in minutitae knowing that the auto-land has things well in hand.

In the F-35 the flaperons are added and taken away for glide path control, and I'm sure the J-15 has a very intuitive system as well. Good call Wolfie, and good comments Quickie, each of you would make a fine pilot! you are ahead of the game. Come on over and we'll let you fly that little red Ercoupe, you would love it.

 

[Intrepid]

Antennas for approach normaly placed below but not on top of wings or fuselage, in particular when they are small and for very short wavelengths.

 

[Quickie]

Antennas for approach normaly placed below but not on top of wings or fuselage, in particular when they are small and for very short wavelengths.

The antennas (if they are indeed antennas) may still be within the line-of-sight considering the height of them and the drooping leading slats during the approach and landing.

 

[delft]

Antennas for approach normaly placed below but not on top of wings or fuselage, in particular when they are small and for very short wavelengths.

Indeed. What do these presumed antennae do to the flow over the wing under all flight conditions and why would the price paid compared with putting them under the wing be acceptable. All engineering is making compromises.

 

[Intrepid]

The antennas (if they are indeed antennas) may still be within the line-of-sight considering the height of them and the drooping leading slats during the approach and landing.

Not allways. A SU-33/J-15 airframe can have an amazing pitch angle:

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.

 

[delft]

Not allways. A SU-33/J-15 airframe can have an amazing pitch angle:

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.

But that happened when the approach went wrong. This system should make the approach and landing easier and of course when the the system looses its contact with the carrier it is certainly time to go around again.

 

[Quickie]

Not allways. A SU-33/J-15 airframe can have an amazing pitch angle:

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.

The SU-33 only began to have the higher pitch angle when it decided to abort the landing and start pulling up. As can be seen in this video, the SU-33, when in a successful landing, was only at about a 15 degree pitch angle.

 

[GreenestGDP]

Thank God ~ PRC is blessed to have more and more Engineers + Scientists like J-15 Chief Designer < SUN Cong > who is unorthodox, Think--Outside--the--Box, and willing to always push the envelope.

BTW, at one time Mr. < SUN Cong > had threatened to quit
this J-15 project, and asked ShenFei to find some other Engineer + Scientist, when the orthodox ShenFei top level management insist on developing J-15 by cloning Su-33 as much as possible, just to be safe ( basic Su-27 Air Frame + Su-33 Inner hardwares ).

( Just--to--be--Safe ) is very inferior attitude. One will be forever behind.

===

Mr. < SUN Cong > insisted on self--innovating and self--developing every other naval aircraft hardwares and softwares, and only use the basic Su-27 Air Frame Aerodynamic additively manufactured platform.

Mr. < SUN Cong > has his 2nd office on board of Liaoning CV-16.
Probably, he is presently living on Liaoning, not in Shenyang.

I hope he can quickly develop the system to make J-15s auto adjust its Rolling Angle and matching the Aircraft Carrier landing deck rolling angle while landing. This tech will be very critical to land J-15 under violent weather environment.

This Auto-Adjust-Rolling angle tech is applicable to other bigger and much less nimble platform like the upcoming AWACS & ECM Jammer naval aircraft as well.

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Just curious ... ...does any of you know any other US / UK / France aircraft that already has the ability to Auto adjust its Rolling angle and matching the Aircraft Carrier landing deck rolling angle while landing ??

 

[Intrepid]

Just curious ... ...does any of you know any other US / UK / France aircraft that already has the ability to Auto adjust its Rolling angle and matching the Aircraft Carrier landing deck rolling angle while landing?

I have no idea, what the problem with the rolling angle is. A landing aircraft has to be adjusted with the drifting centerline by several times roll a little to the right. But that has nothing to do with the pitching and rolling of the ship.

 

[GreenestGDP]

@Intrepid

I imagine ... ... Under sufficiently violent weather environment, ... ...It is critical to land with both Rear Landing Gear touching the AC landing deck at the same time and in the vicinity of the AC center line sailing direction. ... Right ?

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BTW, circumnavigate does not work if the Violent weather is suddenly developing in the vicinity and approaching fast.

Thus, one try to minimize and prioritize the number of Aircrafts on the top deck and store as many aircraft as possible below deck to protect them from Salty seawater. ... ...Right ?