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- Oct 3, 2016
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I'm glad you have your priorities straight.Fins sanded.
Centering rings glued.
Blackberry Sour Poured.
With the diametric rods running across the rings, I wouldn't be too surprised if that's the one that whistles.I finished two rockets today. One is an attempt to make a whistling rocket... The other one is a ring fin.
Congratulations. It must be a relief to have that done.The hardware integration is completed for the Vertical Trajectory System with the new version two hardware.
You could just reduce your gains, couldn't you? More authority than you wanted is sometimes a good thing; it lets you make smaller movements of the fins, which happen quicker, making the system more responsive. (Unless you're having to deal with lash, in which case the movement needs to be a good few times bigger than the lash.) It also means you can make larger corrections than you anticipated needing.Next on the list is to get some smaller fins printed on the SLA resin printer. Those ones shown worked ok but gave me far more control authority than I wanted.
Is that apogee detection? A pretty sizable angle? Otherwise I figure you wouldn't want to shut down just when things are getting bad. Especially if you've got control authority to spare.Stabilisation ceases when tilt exceeds a preset angle...
!There are around 500 parameters...
Nice. And I guess once you have that you could also use low airspeed as an additional method of apogee detection.The new hardware has provision for a pitot-static tube to measure airspeed, and this is used in the PID control loops to modulate control surface excursions based on actual velocity. I guess making a pitot-static tube is in my future as well.
It had a couple of "I'm just not going to light this igniter" snits, and the continuity light started coming on even when the safety pin was out. It looks like there was a stray connection made in there somewhere, and possibly resulted in low battery power. But then it started lighting igniters later, so who knows? I think I need to rebuild the pin switch and maybe put some of the components on to a fiberglass board. Or maybe just give up and buy a PS2 controller. I've only got about 3x the cost of a PS2 into this one, with similar functionality. But the sunk cost fallacy is hard to resist.Do tell.
So far, I've only done the basic field check of opening it up, looking for any gross issues, and closing it back up again. I will do the basic check as well once I have time to get it on the bench. Thanks!I assume you've done the very things I would suggest if you haven't. Check all the connections, looking especially for stray strands out of stranded wire. Then reflow any the soldered connections. Then give a little tug on any crimp connections. There's only low to medium probability of finding the problem, but it's a small investment of time, so it's worth it.
It was all Mr. Pommert. I was just kibitzing...I got out to fly a little bit with the TARC team on Saturday. Flew my L1 cert (Cheeto Dust) on an AT G78 (Thanks @BEC and Jim for the loan of your launch pad and controller!), plus Spruce Goose on a CTI G83 and Harry Bourland on both CTI F36's (BS and SS). Overall, a great day flying in nearly perfect weather. I do need to troubleshoot the flight controller I built over the winter. Weird gremlins all around in there.
I definitely tested a couple of igniters for serious gremlins before putting anything into a motor!It was all Mr. Pommert. I was just kibitzing...
Gremlins and igniters are not a happy combination
It was about as good a day as we get in February. I got back up there Sunday as well and did a bunch of two-altimeter flights test flying some new firmware for Russ Parrish. Fewer people, but a bit more chilly breeze at times.
I am only going for relatively small excursions, limited to about 7deg mechanically. At small numbers the PWM stream starts to become quantised so by using a larger excursion but with smaller fins I get the authority I want with a more contiguous movement (smaller steps). I have flown with those fins and it makes for a surprisingly agile flight path. I want nice, calm correctionsYou could just reduce your gains, couldn't you?
I could, but apogee detection is done by the TeleMega in the NC. That keeps the rest of the rocket a standard HPR flight.Nice. And I guess once you have that you could also use low airspeed as an additional method of apogee detection.
Ah, resolution, or course. Foolish of me to be thinking analog.I am only going for relatively small excursions, limited to about 7deg mechanically. At small numbers the PWM stream starts to become quantised so by using a larger excursion but with smaller fins I get the authority I want with a more contiguous movement (smaller steps).