#31
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I have put together a crude simulation in OpenRocket - modeled the shroud/camera as a thick plastic fin attached to a zero length, zero mass body tube, which causes warnings in Open Rocket. Still the altitudes seem reasonable.
File attached.
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#32
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Altitudes are a little optimistic based on my flights from yesterday. I got 292 on B6-4 and 654, 616, 667 and 665 on Cs. The low flight pitched into the wind noticeably more than the others.
The simmed model is ~0.2 ounce light. Mine weighed 2.16 ounces without a motor before the first flight.
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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE Last edited by BEC : 07-31-2020 at 09:33 PM. |
#33
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Quote:
I went back and rewatched all six videos from yesterday. One of the C6-5 flights (the one that weathercocked the most) actually got all the way over the top before ejecting. All the others were early, with the model still vertical on the way up on the C5-3 flight (not surprisingly). So yes, some longer delays will be worth a try. I figured out that a 'chute shroud line got caught on the plastic shock cord mount inside the model which kept the 'chute from getting out on its last flight last night. That's why it got crunched falling from 660 feet up. Added: See picture attached. I will replace the body tube with some BT-50 (or maybe ST-9) from parts on hand and it will fly again soon.
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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE Last edited by BEC : 08-01-2020 at 01:30 AM. Reason: adding picture of hung parachute shroud |
#34
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If you use ST-9 you might want to stick with the delays you have already used, it might end up almost perfect. I love that you use the altimeter every time. |
#35
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Yeah, it'll pick up a tenth of an ounce or so, I'd guess, if I use ST-9. I do have some BT-50, but none in white, and I'd like to attempt to pull the sticker off the crunched pearly white body tube and transfer it to the repaired bird.
added: after weighing tubes, it'll pick up just short of two tenths of an ounce if I use ST-9 to rebuild it.
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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE Last edited by BEC : 08-01-2020 at 01:28 AM. |
#36
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That's what you get when you re-use names. People downstream think they can re-use other materials! That listing is for the old film Astrocam. And who knows? Maybe AC Supply still has a few of those.
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Roy nar12605 |
#37
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Also don't forget they are counting in Estes Seconds, which equal between 0.8 and 0.9 real seconds. That flight ejected pretty much right at 4 seconds after liftoff, so the actual delay was probably 3.2 seconds!
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Roy nar12605 |
#38
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Thanks for noticing that. I've also noticed that it shuts off when you plug it in for charging.
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Roy nar12605 |
#39
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All in all, I was originally disappointed in the video quality, but upon thinking about it, with the tiny mass, the size, the form factor being so compact and uncluttered (compared to, say, an 808 key fob camera), and mainly the price point they were able to make after including a kit, a launcher, controller, and two motors,
.... and especially compared to the two previous efforts (Oracle and Astrovision).... this is quite a good value.
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Roy nar12605 |
#40
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