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#1
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New Estes E-12 Motors!
The following motor has been certified by NAR Standards & Testing for general use as a Model Rocket Motor effective September 29, 2011.
************************************* Estes: E12-0,4,6,8 24mm x 95mm 27.24 Newton-seconds Total Impulse 33.29 Newtons Peak Thrust 11.17 Newtons Average Thrust Propellant mass: 35.9 grams Last edited by Gus : 10-29-2011 at 10:37 PM. |
#2
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Excellent news! Some of you thrust curve gurus chime in on this.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper |
#3
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Quote:
I just compared it to the E9. Same length case. E12 has 2.5s burn time vs 3s for E9. Both have sustainer portion of curve at ~10N. Both are ~36g of propellant (ie, no mailing). The key diff is that the E12 has a 33N initial thrust spike vs 20N for the E9. So the E12 is very much like a longer burning D12 with a similar initial kick. I'm really looking forward to getting my hands on some of these! This is really exciting news. Doug
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YORF member #11 |
#4
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I was kind of hoping for something like a D24 or E20, but this is still great news.
I assume that the E12 uses the same nozzle as the D12, so that means the same igniter plug. This makes it an "economical" choice for a new BP motor. I recall that one of the reasons Estes didn't release the core-burning D was that it would have required new igniter. Hmmm, this means that if I ever build a "Bigger Beth X-2" there will be more choices for the booster. |
#5
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That'll go nice in my Megatron!
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Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
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#6
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Most interesting thing is that the increased peak thrust actually allows for an E booster motor.
Although E9-0s were listed in some places I don't believe they were ever produced (just E9-Ps). So E12-0 to E9-8 ought to make for some interesting flights. Think we'll see an Estes EE-Express? |
#7
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Very exciting news! And completely out of the blue as well. I really like that fact that it has a booster version as well - That will make it fun and really useful. For those who are more up on the regs than I am, do three of these remain legal to fly without level one cert, or is there enough propellant that three of them push over the threshold? If they are under the line, these babies will really rock in my 3x24mm Tube Daddy!
Greg |
#8
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Quote:
I don't quite follow this... The D12 burn duration is 2.7 seconds, is it not?? The E9 is 3 seconds, correct?? So the E12 is now 2.5 seconds, with the same peak thrust as a D12?? How is this a higher performing motor (IOW an "E" motor) if it has the same DURATION as a D12 and the same peak and average thrust as D12?? I get it that it's a LOW END "E" motor, so it's not going to be double the duration of a D12 at the D12's average and peak thrust levels to be a "full E", or that it has DOUBLE the peak and average thrust for the same duration as a D12, (or some combination thereof) but I don't follow how this is an "E" motor if it has the same burn characteristics as a D12... and the D12 at 17N/s isn't a FULL "D" motor either... I must be missing something... Last I heard though, thrust times duration = total impulse (motor letter class) later! OL JR
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The X-87B Cruise Basselope-- THE Ultimate Weapon in the arsenal of Homeland Security and only $52 million per round! |
#9
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Quote:
Yep, you're missing something. The D12 is 1.6 seconds. The E12 burns 50% longer.
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Roy nar12605 |
#10
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The thrust curve is similar to the D12, except it burns for another second.
Remove the ".txt" from the file "Estes.E12.eng.txt" and you will have a working .eng file. Greg Quote:
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