#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: Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle In paint: Canaroc - Starfighter Scorpion Centuri - Mini Dactyl Estes - F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II, Xarconian Cruiser Semroc - Cyber III Ready to fly: Estes - Solar Sailer II Semroc - Earmark |
#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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Why would a core burning D need a new igniter? I use standard estes igniters to ignite ex core burning bp motors. Just need to get the head touching the bp just beyond the nozzle. The method of installing the igniter would be different.
I do agree these E12's look awesome. Can't wait top get my hands on some. |
#9
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Just ran a quick Rocksim of an Estes CC-Express with the booster lengthened to 107 mm (95 mm motor + 8 mm aft engine block). Loaded the sim with an imaginary E9-0 to E9-8. Mass is the same as it would be with an E12 to E9 combination, and the revised version ("EE-Express") is still stable.
Rocksim predicts 947 meters (3,107 feet). I imagine an E12 to E9 altitude would be slightly lower, but not much. Very impressive. The CC-Express sustainer is also stable with an E motor in a 3 fin version. Rocksim of a 3 fin sustainer and 3 fin booster (same fins as used on the CC-Express) is also still stable with an E to E combination. Rocksim predicts 1004 meters (3,294 feet). Very cool. |
#10
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Great news indeed. This is what the E9 should have been to start with.
Now that it is done, I hope that Estes will continue to make E9s so that we have that choice. Saturn Vs and 1Bs should now be built with 95mm long motor mounts. Bill
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It is well past time to Drill, Baby, Drill! If your June, July, August and September was like this, you might just hate summer too... Please unload your question before you ask it unless you have a concealed harry permit. : countdown begin cr dup . 1- ?dup 0= until cr ." Launch!" cr ; Give a man a rocket and he will fly for a day; teach him to build and he will spend the rest of his days sanding... |
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