Rocketry Planet

CEDAR CITY, Utah USA — The Tripoli Motor Testing (TMT) committee of the Tripoli Rocketry Association (TRA) has tested and approved a number of new AeroTech products.

The 38mm AeroTech RMS™ reload adapter system (P/N 38RAS) is now TMT-approved.

MORE ON THIS STORY:
• AeroTech 54/852 & J99N Assembly Drawing

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• AeroTech 54/852 J99N Thrust Curve

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• AeroTech 38/1320 J510W Thrust Curve

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• AeroTech 75/5120 M1780NT Thrust Curve

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• AeroTech 98/7680 M1845NT Thrust Curve

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• AeroTech 98/15360 N3300R Thrust Curve

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38mm RMS Reload Adapter System
The previously-announced 38mm AeroTech RMS™ reload adapter system (P/N 38RAS) is now TMT-approved and allows the use of shorter (lower power) RMS reload kits within a specific motor casing, reducing the number of cases necessary to fly a wide range of AeroTech reloads. Customers will save money and expand the versatility of their existing 38mm RMS hardware at the same time. The reload adapter system includes the "floating" forward closure, a standard retaining ring and two case spacers. MSRP is $29.99.

N3300R-PS Reload Kit For 98/15360 Hardware
The largest of the newly-certified reload kits is the eagerly-anticipated N3300R-PS (P/N 14330P). This Redline™ propellant reload delivers a total impulse of 14,041 newton seconds during a burn time of 4.4 seconds, with a peak thrust of over 950 pounds. Propellant weight is 7,338 grams and the loaded weight is 12,054 grams. The N3300R generates Redline's signature intense laser-red exhaust plume with highly visible "mach diamonds". It fits AeroTech, Dr. Rocket™ or Rouse-Tech™ RMS-98/15360 hardware and is offered at an MSRP of $798.99.

75/5120 and 98/7680 KEB Signature Line New Blue Thunder Reloads
TMT also certified two core-burning Karl E. Baumann (KEB™) Signature Line™ reloads, the 75/5120 M1780NT-PS (P/N 13178P) and the 98/7680 M1845NT-PS (P/N 13184P). Both reloads use AeroTech's high-performance New Blue Thunder™ formulation which delivers a specific impulse in the 220-224 second range, and produce a beautiful lavender-blue exhaust jet with distinct mach diamonds. The M1780NT-PS generates 5,783 N-sec of total impulse over a burn time of 3.1 seconds with a peak thrust of nearly 600 pounds. The M1845NT-PS produces 8,308 newton-seconds total impulse with a burn time of 4.4 seconds and a peak thrust of about 550 pounds. Propellant weights are 2,480 grams for the M1780NT-PS and 3,718 grams for the M1845NT-PS. Loaded weights are 4,715 grams and 6,682 grams respectively. MSRPs are $239.99 for the M1780NT-PS and $428.99 for the M1845NT-PS.

J99N-P Endburning Reload for 54/852 Hardware
A new end-burning KEB Signature Line reload was approved, the 54/852 J99N-P (P/N 10099P). This Warp-9™ propellant motor delivers 945 newton-seconds total impulse with a burn time of 10.2 seconds. The initial (peak) thrust is 32 pounds gradually tapering to approximately 17 lbs just before burnout. Propellant weight is 480 grams and the loaded weight is 899 grams. This reload requires the use of a new 54mm aft closure that accepts the smaller 29 & 38mm molded nozzle inserts, P/N 54ACCSN, and a 54mm forward closure bulkhead plug, P/N 54FCBP. The new 54mm aft closure will also be used on a number of new and redesigned 54mm reload kits to be released in the near future. MSRP for the J99N-P is $79.99, the small nozzle aft closure is $39.99 and the bulkhead plug is $19.99.

New 38/1320 Motor Case and J510W-L Reload
Finally, TMT tested a totally new 38mm RMS motor configuration, a 38/1320 motor case (P/N 3813CA) loaded with a J510W-L reload kit (P/N 10510L). The 38/1320 motor is essentially an "11-grain" design and is 23.0" in length. However, the J510W-L reload actually uses six (6) longer White Lightning™ grains and produces over 1,162 newton-seconds of total impulse with a burn time of 2.2 seconds and a peak thrust of 250 pounds. Propellant weight is 640 grams and total weight is 1080 grams. The new 38/1320 motor case includes a forward seal disk and will retail for $89.99. The MSRP of the J510W-L reload kit is $79.99.

AeroTech anticipates that shipments of the new products to its dealers will begin within 2-6 weeks.

Motor instructions, assembly drawings and the official TRA certification documents for the five new reloads will soon be available for download in PDF format from the AeroTech Resource Library at http://www.aerotech-rocketry.com/.

AeroTech Consumer Aerospace is a division of RCS Rocket Motor Components, Inc., Cedar City, UT.

Reader comments:

#1 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

Nice - a certified large J in 38mm is something that has been out of circulation for a long time. This will shatter some records in J altitude I suspect.

UncleVanya on 10-26-2009 01:51 PM

#2 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

Quote:

Nice - a certified large J in 38mm is something that has been out of circulation for a long time. This will shatter some records in J altitude I suspect.

It will be interesting to compare Cesaroni's J530 and J420 against the new Aerotech J. Based on the total impulse and total length, it should be close. I would expect that Kurt Von Delius could break 20kft with any of those 3 motors. I'll probably take a shot at it myself next spring.

Adrian A on 10-26-2009 02:33 PM

#3 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

Quote:

It will be interesting to compare Cesaroni's J530 and J420 against the new Aerotech J. Based on the total impulse and total length, it should be close. I would expect that Kurt Von Delius could break 20kft with any of those 3 motors. I'll probably take a shot at it myself next spring.

Is this an oddball new case? 1320? One load, right?

This is pretty close to the CTI J530 Imax. Within 20ns certified (nothing) and the CTI case must have about 5 loads for it. So for people who are real AT junkies I presume this is a welcome offering. For records geeks they probably have a wide variety of options anyway in this range. For sport whatever floats your boat, but 5 choices vs. 1.

So AT got the casing spacer thing certified. That's good for users. CTI really was first with that and actually has more choices (38, 54, 75, and 98) already certified by CAR.

So many choices so few members.

Jerry

Just Jerry on 10-26-2009 03:02 PM

#4 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

Quote:

Is this an oddball new case? 1320? One load, right?

This is pretty close to the CTI J530 Imax. Within 20ns certified (nothing) and the CTI case must have about 5 loads for it. So for people who are real AT junkies I presume this is a welcome offering. For records geeks they probably have a wide variety of options anyway in this range. For sport whatever floats your boat, but 5 choices vs. 1.
Jerry

For this record geek, it's basically the 4th motor in the large end of 38mm J motors. The other ones are the Loki J1000, Cesaroni J530, and the Cesaroni J420. This one about the same length as the Loki, and has 38 Ns less impulse, but a better burn profile. The CTI loads are significantly shorter with about 19.7" to the front of the motor, vs. about 24.75" to the front end of the forward closure for the new AT case. The J530 has 47 Ns less impulse than this new AT J510.

Adrian A on 10-26-2009 03:27 PM

#5 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

J99?

Oh lord, my 54mm Stealth is gonna be quite happy.

H_rocket on 10-26-2009 03:36 PM

#6 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

Quote:

For this record geek, it's basically the 4th motor in the large end of 38mm J motors. The other ones are the Loki J1000, Cesaroni J530, and the Cesaroni J420. This one about the same length as the Loki, and has 38 Ns less impulse, but a better burn profile. The CTI loads are significantly shorter with about 19.7" to the front of the motor, vs. about 24.75" to the front end of the forward closure for the new AT case. The J530 has 47 Ns less impulse than this new AT J510.

Does the length difference matter? I suppose it is more mass and fits fewer rockets, but anybody who uses thrust rings or builds to limit motor length should be punished anyway.

Jerry

The J99 is cool. I'll be curious to see the thrust curve. It is RAT or something else?

Just Jerry on 10-26-2009 03:47 PM

#7 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

Quote:

Does the length difference matter? I suppose it is more mass and fits fewer rockets, but anybody who uses thrust rings or builds to limit motor length should be punished anyway.

Jerry

The J99 is cool. I'll be curious to see the thrust curve. It is RAT or something else?

The extra 4" of length is relevant for the drag. If you click on the links you can see the thrust curve for the J99. That is a cool motor, with almost a 10 second burn. The total impulse is enough lower than the biggest 38mm Js that it's probably not a record contender, even if the burn duration offsets the frontal area. But it will still be interesting to sim.

Adrian A on 10-26-2009 03:58 PM

#8 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

Well I built my L2 rocket to allow what I thought was the biggest 38mm APCP motor I could get from my local vendor. Now this comes out and my booster is 5" to short to fit it. I whish I had known about this 2 weeks ago. I would have redesigned to allow it to fit. Oh well. I guess I can always build another booster for it next year after AT releases more motors for this case. Endburning W-9 maybe?

KI6HNB on 10-26-2009 04:02 PM

#9 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

Quote:

If you click on the links you can see the thrust curve for the J99.

But it will still be interesting to sim.

Thanks for the advise. I did simply click on the link now. I noticed the nozzle insert is a near direct clone of the USR system out for years. I also note the grain geometry is a pure endburner even though the thrust curve is a gently dropping slope. Nice thrust curve BTW.

I think this is caused not by any grain geometry trick, but by nozzle throat erosion! USR nozzles in 29mm and 38mm motors are good for 2-10 firings where AT nozzles in the same systems with the same propellant are typically only good for 1-2 firings. That interesting tidbit in my brain makes it clear why the thrust curve drops. The throat is eroding!

Just Jerry

I didn't have to wait long to see the first victim of motor length construction limits! 15 minutes.

Just Jerry on 10-26-2009 04:42 PM

#10 Re: Article: TMT certifies 38mm RMS adapter system, 5 new RMS reloads

The J99N is a great motor. I've flown it twice once to 5K and the second time to 6K.

C.O.B.H.C. on 10-26-2009 04:49 PM

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