#21
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John Cato has posted a few times on TRF, maybe he will post here. The RMR mess was awful but impossible to ignore. It's ironic but TMT still does not publish thrust curves, they just make announcements as far as I can tell. |
#22
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Half of my TMT motor approvals were made without even any data. When Kelly and Rogers unilaterally decertified them, they could not find a reliable date to report.
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#23
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They don't but I've talked to Paul at TMT and I have no doubt he actually fires the motors and collects data. TMT is pretty much a one man show so if no one asks for the curves I can see where creating them wouldn't be a priority. NAR S & T has plenty of members so the work load gets spread out.
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Bill Spadafora http://www.billsplumbing.com billspad@comcast.net bill@billsplumbing.com |
#24
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Lol here we go again, where's Kaplow?
So without publishing the data or curves, then you just have to go on trust, right? Why wouldn't creating them be a priority? Wouldn't they want to compare them to the manufacturer's published curves? Don't you? Quote:
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#25
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cite: http://www.thrustcurve.org/motorsearch.jsp?id=145 |
#26
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He registered here about a year ago, FYI. Don't know offhand the last time he logged in though.
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Scott D. Hansen Ye Olde Rocket Shoppe - Your One Stop BAR Shoppe! Ye Olde Rocket Plans - OOP Rocket Plans From 38 Companies! Ye Olde Rocket Forum WOOSH NAR Section #558 |
#27
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Good point.
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#28
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It's always a matter of trust. I can't answer for TMT but, unless the members ask for the curves, I can see where it wouldn't be high on the list. You really don't need to compare the curve to the manufacturers published curve. You just need to check what NFPA 1125 calls for. That said, it's easier to do the job with the curve in front of you. I've seen an energetic ejection charge create a false peak thrust. Since the burn time and delay time are computed starting and ending at 5% of peak, that has to be cleaned up to get accurate numbers. The data acquisition that S & T uses (and I assume TMT) displays the curve but it takes time to make it look good enough to be useful. And to answer Jerry's question, I'm almost positive TMT is providing data to thrustcurve.org so the job is getting done.
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Bill Spadafora http://www.billsplumbing.com billspad@comcast.net bill@billsplumbing.com |
#29
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I only remember the awfulness of it, and not much of its substance. I remember forming an opinion that I would probably never join TRA. I started the ContestRoc YahooGroup in 2002 and moved on.
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-Wolfram v. Kiparski NAR 28643 - TRA 15520 MTMA Section #606 President |
#30
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Thanks for the reply. After I posted those questions I started to suspect that the curve isn't part of the requirement.
OK thanks. Quote:
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