JimJarvis50
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Well, since lots of data is being posted, here is my ground video of the flight. Was an honor to witness it first-hand.
Jim
Jim
Do you have the date and time of launch and the lat and long of the launch point? I'd like to enter this into the catalog of suborbital space launches.
- Jonathan McDowell
All I can say is wow! Nice job. Thanks for sharing.Amazing flight, Kip! Tremendous accomplishment!
Telemetry data was received on the ground during the flight. The Kate-3 system narrated the entire flight in real time using the telemetry data. Additional data was also processed post flight by downloading it from the flight hardware.Were you able telemeter data back or was that data all done post recovery?
Kip is still working to finish the onboard video. He said he will post it as soon as he can. He already posted a couple of still images from the video in his original post that started this thread.Was any video taken from inside the rocket? Has it been posted yet?
Well, since lots of data is being posted, here is my ground video of the flight. Was an honor to witness it first-hand.
Jim
There is one at the top of the page.....Incredible! Will there be a video posted of the launch?
Okay, my bad? There wasn’t any in the original post and I didn’t see that comment.There is one at the top of the page.....
Calibrated load cell and weighing each casting tube before casting the propellant. In the picture below that’s ~1,500 lbs if I remember correctly. Each plate was individually weighed on a calibrated scale and recorded. Then stacked all of them multiple times to ensure a reliable measurement on the test stand base with the load cell mounted.I've never seen a static test filmed from so many angles - cool.
Do you really think you achieved an ISP of 233s? How did you come up with that number?
Calibrated load cell and weighing each casting tube before casting the propellant. In the picture below that’s ~1,500 lbs if I remember correctly. Each plate was individually weighed on a calibrated scale and recorded. Then stacked all of them multiple times to ensure a reliable measurement on the test stand base with the load cell mounted.
233s is an accurate performance spec and I clipped the ISP measurement once thrust dropped below 10% of peak. If I went with the hobby standard of 5%, ISP would be a bit higher.
Thanks! Yes, I doubled the expansion ratio from what I tested on the ground for the sustainer flight motor. Beyond that was diminishing returns because the nozzle was getting quite long.That is awesome. I used weights like that on a thrust stand I built in the past. Did you use a higher expansion ratio on the sustainer motor to get a little more performance?
I am calculating around 240s+ for the Aerotech Propellant X so 233s is not suspiciously high. It is excellent though. All around this project is excellent. When I first saw it on facebook I was impressed, but as I dug deeper, I am realizing this was a very well thought-out and tested effort. I hope Kip documents the effort and publishes it.The specific impulse 233s + sounds impressive. I think shuttle SRB specific impulse was around 240s at sea level (vacuum Isp was nearly 270s). That must be some propellant and grain design. You have constant thrust for many seconds. I am wondering how you arrived at the delay time from first stage burn-out to second stage ignition.
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