Rocketry Planet

The following motors have been certified by NAR Standards & Testing for general use as High Power Rocket Motors effective May 22, 2009.

Aerotech:
I49N-P
38mm x 184mm
383  Newton-seconds total impulse
63.7  Newtons Peak Thrust
49.4  Newtons Average Thrust

Propellant mass: 190.8 grams

Warp 9 Propellant

For use in Aerotech 38/360 hardware with 38EBFCPT forward closure only.

Aerotech:
I59WN-P
38mm x 232mm
486  Newton-seconds total impulse
172.9  Newtons Peak Thrust
60.8  Newtons Average Thrust

Propellant mass: 251.7 grams

White Lightning/Warp 9 Propellant

For use in Aerotech 38/480 hardware with 38EBFCPT forward closure only.

Bill Spadafora, Secretary
NAR Standards & Testing
Email: This email address is being protected from spam bots, you need Javascript enabled to view it  

Documents:

• NAR S&T AeroTech I49 certification document (108KB Adobe PDF)
• NAR S&T AeroTech I59 certification document (106KB Adobe PDF)

Reader comments:

#1 Re: Article: R128: NAR S&T New Motor Certifications

Feeling foolish he asks... what is this:

Quote:

...38EBFCPT forward closure...

EDIT: Never mind, I found the answer in another thread.

UncleVanya on 05-28-2009 09:37 PM

#2 Re: Article: R128: NAR S&T New Motor Certifications

I am starting to lose my mind with these new motors...

That warp 9 N motor sounds like a beast.

New Ocean on 05-28-2009 10:23 PM

#3 Re: Article: R128: NAR S&T New Motor Certifications

These new motors are truly unique and I look forward to seeing them in action. Some things just strike my curiosity... if these are "high performance" motors, then why is their Total Impulse so much lower than the maximum in their class? Sure, who doesn't like a good 8 second burn? That is awesome if you ask me, but is it really a performance motor? To side the other way... it will keep the velocities of the rocket down and therefore keeping the drag much lower than the 1.5-2.2 second burning "I" motors.

Just my evaluation if it means anything.

chicagonative17 on 05-29-2009 12:28 AM

#4 Re: Article: R128: NAR S&T New Motor Certifications

To make a Full 'I' for the 38/600 case would likely be a struggle since the burn time would be so long...its an endburner so the propellant burns from one end to the other leaving exposed liner behind the flame front as it progresses up the grain. Not like a BATES grain where the liner is insulated by the propellant for the duration of the burn time. I doubt that we'll see any endburners with a higher L/D ratio than the I59 for this reason.


So I guess what they mean by performance is that they have a lot of impulse for their casing size, since they have a 100% volumetric loading.

Regardless they are very cool motors, thanks Gary!

Ethan

Ethan on 05-29-2009 01:58 AM

#5 Re: Article: R128: NAR S&T New Motor Certifications

A Warp 9 burning for over 7 seconds? I thought W9 was supposed to be some ridiculously fast burning stuff. Oh well, these motors sound way cool and even though they are not a maximum "I" wouldn't they make for good altitude record attempts?

-Dave

DAllen on 05-29-2009 05:55 AM

#6 Re: Article: R128: NAR S&T New Motor Certifications

Quote:

A Warp 9 burning for over 7 seconds? I thought W9 was supposed to be some ridiculously fast burning stuff. Oh well, these motors sound way cool and even though they are not a maximum "I" wouldn't they make for good altitude record attempts?

-Dave

these are burning in endburning configuration where as the other warp nine motors are bates style. That means that there is less surface area burning, ie: the casing dia, thus a longer burn time. Though the chamber pressure and Kn would still be the same (smaller nozzle)

it still has the same propellant burn rate, just different configuration. The high burn rate is actually what allows it to endburn

Avachovy on 05-29-2009 07:07 AM

#7 Re: Article: R128: NAR S&T New Motor Certifications

Quote:

To make a Full 'I' for the 38/600 case would likely be a struggle since the burn time would be so long...its an endburner so the propellant burns from one end to the other leaving exposed liner behind the flame front as it progresses up the grain. Not like a BATES grain where the liner is insulated by the propellant for the duration of the burn time. I doubt that we'll see any endburners with a higher L/D ratio than the I59 for this reason.

Higher L/D endburners will require a thicker liner.

Quote:

So I guess what they mean by performance is that they have a lot of impulse for their casing size, since they have a 100% volumetric loading.

That, and the benefit of the extended burn time.

Garoq on 05-29-2009 12:20 PM

#8 Re: Article: R128: NAR S&T New Motor Certifications

Awesome! Makes me wonder what altitudes you could get with a really really short MD rocket set to optimal weight with an 8 second I motor in her Might not be record setting but sure as heck will be cool.

chicagonative17 on 05-29-2009 12:25 PM

#9 Re: Article: R128: NAR S&T New Motor Certifications

Quote:

Awesome! Makes me wonder what altitudes you could get with a really really short MD rocket set to optimal weight with an 8 second I motor in her Might not be record setting but sure as heck will be cool.

It's all good.

Garoq on 05-29-2009 12:44 PM

#10 Re: Article: R128: NAR S&T New Motor Certifications

Longer burning motors are good for clusters, especially with mixed high and low thrust motors.

Jerry

Just Jerry on 05-29-2009 12:48 PM

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