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54mm DMS™ J450DM & K535DM Case Winding Advisory

It has come to our attention that there may be an issue with some of the current production run of 54mm J450DM and K535W Disposable Motor System™ (DMS) single-use motors. AeroTech’s casing supplier apparently mixed some out-of-specification cases in with their latest shipment. It appears to only affect the 4-grain 54mm case, and it appears that about 35% of the cases have a winding angle significantly steeper (about 75 degrees) than the 55 degree specification. The steeper winding angle significantly reduces the strength of the case. This was not discovered during the receiving inspection, as a sample percentage of the cases are measured.

The motors and lot numbers that are affected are:

J450DM, lot number 092818 (22 produced)

K535W, lot numbers 092418 (13 produced) and 101718 (20 produced)

Two J450DMs failed at Midwest Power last weekend, the first failure resulted in separation of the case just forward of the nozzle, and the second failed just aft of the forward bulkhead. There were no K535W failures and a number of current production K535Ws were flown without incident.

We are advising our customers and dealers of this issue at our earliest opportunity, and asking them to check their stock and notify us (and the dealer’s customers) if there is a discrepancy. A quick check with a protractor can determine if the wind angle is correct on the case.

On our end, production is being directed to inspect 100% of all fiberglass cases upon receiving. The vendor has been advised of the issue, and directed to scrap all out-of-specification material to prevent this from happening in the future.

Your understanding and patience is appreciated, and we thank you for your continued support.

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AeroTech Announces F67W Economax™ Motors
AeroTech is very excited to announce the arrival of the F67W Economax™ rocket motor. The F67W is the 3rd addition to the Economax line of motors, which use AeroTech’s Super White Lightning™ propellant. With a propellant weight of only 30 grams, the F67W becomes the highest total impulse single-use motor that can be shipped via the U.S. Postal Service with no hazmat fee.

“Composite Performance at Black Powder Prices” is the slogan for the Economax line of model rocket motors from AeroTech, and the F67W delivers on that by providing over 61 N-sec of total impulse. The F67W is available in time delays of 4, 6 and 9 seconds. AeroTech’s Economax composite motors have significantly more power than similar size Estes® black powder motor, have higher average thrust, and are up to 43% lighter. The result: it’s like putting a “Bolt of Lightning in Your Rocket!”

As with the other motors in the Economax line of rocket motors, the F67W is being offered in packs of two and at a revolutionary price point. The retail price of a pack of two Economax F67W motors is $28.99, just slightly above the retail price of a pack of two Estes® F15 motors.

Some of the features and benefits of the F67W Economax motor:

  • Easy and quick ignition for fast and stable liftoffs

  • Able to fly all model rockets with up to 3.3 lbs total weight (using the 4 second delay)

  • “High-solids” propellant with higher specific impulse (Isp), high density and higher burn rate

  • Relatively flat thrust curve to increase average operating pressure

NAR certified motor specifications:


Time Delays:
4, 6 & 9 seconds

29mm x 83mm

Total Impulse:
61.12 newton-seconds (vs. 49.61 for an Estes® F15)

Peak Thrust:
86 Newtons

Average Thrust:
69 Newtons

Propellant mass:
30 grams

Loaded Mass:
80 grams (vs. 104 grams for an Estes® F15)

Retail Price:
$28.99 (pack of two)

U.S. Mailable:
Yes (vs. no for an Estes® F15)

No user certification is necessary to purchase the F67W. All Economax motors include FirstFire Mini™ igniters. The F67W is in stock and ready to ship.

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New to High Performance Rocketry?
Visit the Rocket Central website ( for information about how to build and launch rockets thousands of feet in the air. This site includes information about high performance composite rocket motors, reloadable motor systems, and contact information for local rocket clubs in your area. Also visit the NAR & Tripoli websites.
Click here to link to the National Association of Rocketry's (NAR) Launch Calendar
We encourage our customers to purchase full-line AeroTech products direct from the authorized dealers listed here.
or go to Dealers Page