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Upcoming new AeroTech motor
AeroTech, through it's Enerjet subsidiary, will soon be releasing an an 'E24' motor.
To quote Gary Rosenfield, "We will soon have Enerjet Classic E24s certified and available". I don't have any more information at this time. One day at NARAM-48 Gary and I were having lunch and I started talking to him about producing Enerjet kits and motors. At the time Gary didn't have much interest but now that he owns the tradename he has produced the three classic Enerjet motors (F67, F52 and now E24). (The D21 is not included as it did not go into production). Hmmmm...
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Bob S.A.M. # 0014 |
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What about the longer 24mm Q-Jet motors?
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#3
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The E24 sounds like a good one. Wonder if it's 29mm like the Centuri original.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
#4
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Quote:
In my past discussions with Gary I have put forth the idea of using the standard 'F' molded case (29mm x 83mm) and just putting a smaller propellant grain in the casing to make an E24. This has the advantage of economies of scale as a new casing won't be required and increase use of the same casing MIGHT help to lower the cost. I could see an 29mm 'E' motor as being useful. I would buy them.
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Bob S.A.M. # 0014 |
#5
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Quote:
Yet, Aerotech doesn't have even one single-use 29mm E motor. Aerotech seems most interested in filling the "Estes D motor" niche with E and baby-F motors. I'd welcome a 29mm E motor as long as the classic E24 "retro-repro" motor could be a full, 40 N-s E motor. A full E would stand out from the 24x70 crowd.
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-Wolfram v. Kiparski NAR 28643 - TRA 15520 MTMA Section #606 President |
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Quote:
A full E would be good. I guess Aerotech is marketing motors where they feel the 'volume' sales might be, and matching those instances where an Estes D (or E) might be used probably represents a decent population. Earl
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#7
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Quote:
We already have the 35 N-s E20W, 28 N-s E26W, 34 N-s E30T... Do we need another mid-E to round out the 24x70 selection? I hope not. On the flip side we have stretch 24mm motors, like the longer E35W -at 39.4 N-s
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-Wolfram v. Kiparski NAR 28643 - TRA 15520 MTMA Section #606 President |
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Here is the original source of the E24 news. Or at least a source with Gary's own words:
On the Estes Model Rockets group on Facebook, someone posted a photo of an old Enerjet, thinking about flying it. Looks like he'll auction it now. https://www.facebook.com/photo/?fbi...078069588922549 Anyway, Gary responded to that with this: "We will soon have Enerjet Classic E24s certified and available." Given that context, I expect it to be a 29mm motor. 24mm would not be "Classic" I checked the thrust curve of the Aerotech Enerjet F67, and am glad to see that it is not like the classic F67 with the progressive thrust curve. That curve had low thrust at liftoff, and reached max thrust at burnout. Which is a terrible thrust curve unless you are aiming for supersonic (which nobody could prove in those days, and is a teeny niche market). The few Enerjets I flew, shredded almost every model I flew them in. Including E24's (I think most of them were E24's). The curves were like that because they had a simple round core drilled into the center of the grain. So the least propellant was exposed at ignition, and the most exposed at burnout. If did have an advantage for the manufacturer, in that it was simple, and the casing was not exposed to the massive heat of the burning propellant, until burnout. So, they did not need liners to protect the casing from heat (I saw some video of SSRS motors, of similar design, being test fired. At burnout there was a VERY bright (and brief) flash inside of the fiberglass casing when the propellant bonded to the casing wall burned. Anyway, the Aerotech Enerjet F67 has a mostly "Flat" curve. No spike at launch, but no significant increase in thrust at the end, either. So this makes me think the E24 won't have that bad progressive thrust curve, either.
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Contest flying, Sport flying, it's all good..... NAR# 18723 NAR.org GeorgesRockets.com Georges'CancerGoFundMe: https://www.gofundme.com/f/help-geo...ay-fight-cancer Last edited by georgegassaway : 08-30-2022 at 04:21 PM. |
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Gary Rosenfield posted on 'that other rocket forum' that the E24 will use the same 29mm case as the F52 and F67 single use motors and be a full 40 n-sec total impulse.
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Bob S.A.M. # 0014 |
#10
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Good news indeed! Mercury Dual Eggloft Forever!
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-Wolfram v. Kiparski NAR 28643 - TRA 15520 MTMA Section #606 President |
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