Detecting burnout with Moonburners?

[mIcahel]

Has anyone had a problem with staging electronics detecting burnout on long burning HPR motors
Used for booster?

 

[fyrwrxz]

interesting question. Any particular motor? I'm tuned in.

 

[mIcahel]

I'm looking at the taper on the thrustcurves for AT M650, M750, N1000. Similar CTI motors don't seem to have the same "trailing off" in the last couple seconds, thanks.

 

[CarVac]

The Raven detects burnout by measuring a positive change in velocity of 40 ft/s, and then waits for the velocity to drop by 5 ft/s.

This would probably be triggered slightly earlier than actual burnout for moonburners, and possibly much earlier than actual burnout for draggy rockets with dual-thrust motors or very regressive BATES motors.

 

[Eat, sleep, and Fly]

The Raven detects burnout by measuring a positive change in velocity of 40 ft/s, and then waits for the velocity to drop by 5 ft/s.

This would probably be triggered slightly earlier than actual burnout for moonburners, and possibly much earlier than actual burnout for draggy rockets with dual-thrust motors or very regressive BATES motors.

So with precise simulation, there would be a way to determine when the raven senses burnout, and use additional timing settings to set it to the real burnout? Of course, it would be much easier to just use the timer setting with safety parameters.

 

[CarVac]

So with precise simulation, there would be a way to determine when the raven senses burnout, and use additional timing settings to set it to the real burnout? Of course, it would be much easier to just use the timer setting with safety parameters.

You could probably use the delay timer to set it to the real burnout, but it's not like that's so perfectly defined for a moonburner, anyway. What's your objective? The main reason one would time something precisely at burnout is for max velocity staging, but if you're going for max velocity I don't know why you'd use a moonburner...

 

[cerving]

What staging electronics are you using? Why not just use a timer triggered by a G-switch or baro altitude? It's independent of the thrust curve.

 

[mIcahel]

Will use either an ARTS2 or PET2+ along with tiltometer2 for staging. The PET2+ detects MECO when "acceleration falls below the +1G calibration

Point." ARTS2 documentation is not specific about how MECO is detected...