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  #1  
Old 10-29-2011, 11:20 PM
Gus's Avatar
Gus Gus is offline
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Default 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
Attached Files
File Type: pdf EstesE12.pdf (207.4 KB, 194 views)

Last edited by Gus : 10-29-2011 at 11:37 PM.
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  #2  
Old 10-29-2011, 11:58 PM
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A Fish Named Wallyum A Fish Named Wallyum is offline
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Excellent news! Some of you thrust curve gurus chime in on this.
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  #3  
Old 10-30-2011, 12:04 AM
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Quote:
Originally Posted by A Fish Named Wallyum
Excellent news! Some of you thrust curve gurus chime in on this.
Yes, indeed, this is great news! WFK!

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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Old 10-30-2011, 12:13 AM
stefanj stefanj is offline
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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.
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Old 10-30-2011, 12:24 AM
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That'll go nice in my Megatron!
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  #6  
Old 10-30-2011, 12:38 AM
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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?
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  #7  
Old 10-30-2011, 12:40 AM
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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
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Old 10-30-2011, 01:24 AM
Gardei Gardei is offline
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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.
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Old 10-30-2011, 01:29 AM
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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.
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Old 10-30-2011, 01:38 AM
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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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