AJS: Make the Rb05A guidance based on pilot input instead of calculated flight path

NikolaiVChr / flightgear-saab-ja-37-viggen

Saab 37 Viggen for Flightgear flight simulator

http://wiki.flightgear.org/Saab_37_Viggen

GNU General Public License v2.0

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AJS: Make the Rb05A guidance based on pilot input instead of calculated flight path #113

Closed vanosten closed 4 years ago

vanosten commented 4 years ago

Currently you need to lock a target with the radar and then shoot fire and forget. However, that is not how it is guided in real life.

https://www.aef.se/Flygvapnet/Tidskrifter/FV_Nytt/Flygvapennytt_1972-4.pdf has an article on page 24 about it.
Fpl AJS 37 speciell förarinstruktion (SFI) del 1.pdf, page 440 ff.
Fpl AJS 37 speciell förarinstruktion (SFI) del 3.pdf, page 210 ff.

NikolaiVChr commented 4 years ago

Yes but is not trivial to make, and will be next to impossible to get it to hit anything with pilot input in FG.

vanosten commented 4 years ago

Fpl AJS 37 .. del 2.pdf, page 86: with right hand use the mini-joystick to guide the weapon, with left left hand take the stick and fly the airplane.

Fpl AJS37 .. del 3.pdf, page 210: if missile guidance is done during the aircraft flying horisontal, then use autopilot for altitude. If it is done during a light dive, use autopilot for attitude.

vanosten commented 4 years ago

At around 14:02:14:12 in https://www.youtube.com/watch?v=RHVzkVwI68w a pilot can be seen firing a Rb05A and guiding it. also visible is the collimated light at the missile's back

NikolaiVChr commented 4 years ago

I checked this branch, its very neatly done.

However this: m.remote_yaw_path m.remote_pitch_path

Is not needed, right?

colingeniet commented 4 years ago

Merged, and slightly improved the performance to better match the graph in the Rb05 description in the AJ37 SFI part 2. Initial acceleration is much higher, for a launch at M0.75, maximum speed of M1.5 is reached after 5s. I made it a false 2-stage engine to simulate decrease in thrust.