Here's the curve of the H13 from thrustcurve.org
The spike at the start would be great for aerodynamically stable rockets, not so much for something like a TVC gimbaled rocket. The 29 mm gimbal from BPS isn't that strong. Did you see the video from BPS Space's flight using this motor? Didn't go too well.
I'm curious what experiences others will have with these motors.
It can also produce lower gain the plant section of the control loop so if the flyer has set the gains too high, inadvertently, so it will be less inclined to suffer less from oscillatory or unstable behaviour.
Sorry, since I don't program for TVC gimbals, I don't see what you mean here. Perhaps it's the wording?
I wanted to get good video of one of the BPS Space gimbals on a static test stand using the CTI G33 motor. However, the motor failed almost immediately and destroyed the GoPro camera. I wanted to see the movement with the servos on but not moving (stalled). Hopefully, I'll see this someday. Anyway, I think something should be done about the play I'm seeing in these gimbals. I still think Z bends in push rods even with added glue are not good for this. And, choose your servos carefully. Plastic gears might be OK if they are strong enough for the application.
I wasn't too clear about what I meant for a modified delay grain. What I meant was a delay grain lighting really what would be a small low thrust motor. If this is even possible it would take some development. Just talking here, because I'm not going to pursue that.
I think that TVC gimbal rockets have a very limited potential for HPR solid motors. TVC vanes would have a lot more potential because you could use a lot more motors, and larger motors.
Can you imagine the size of the gimbal and rocket airframe for a 54 mm long burn gimbaled rocket? I've witnessed a 38 mm J impulse motor gimbaled rocket. It was a fairly long burn commercial motor, and it was a lot of sky writing. And, I believe the 3D printed gimbal ended up failing from the heat.
TVC gimbaled rockets are cool and I appreciate the thought and work necessary to get one to work well. But, the question was "what do you MPR and HPR people think of Thrust vector control" and this is what I think. Also, I'm assuming this was about TVC gimbaled mounts and not others. I don't think I've seen a thrust vane system on this forum and wonder how different the control system would be.