Manufactured from thin-wall 6061-T6 aluminum tubing with a clear anodized coating for corrosion protection, Pro38^® motor cases are lightweight but strong, capable of holding well over 3000 psi of internal pressure. The forward closure is retained by a formed rim at the head end of the casing. The rear of the casing has precision-machined internal threads.

Pro38^® motor casings are available in seven sizes. Please refer to the motor specifications page to see which casing is required for each Pro38^® reload.

Don't forget that you'll need a delay adjustment tool for your Pro38^® reloads, unless you use electronic ejection exclusively. The ProDAT-38^® tool allows you to choose from 5 preset delay times with every reload

Step 1: Pick the diameter of the engine. Clicking on the diameter will take you to more information about each diameter motor so you can select the correct casing.

• 24mm Dia. Motors (power: E - F ) - Coming Soon
• 29mm Dia. Motors (power: F - H )
• 38mm Dia. Motors (power: G - J ) - You're On the Right Page Now!
• 54mm Dia. Motors (power: I - K ) - Call to Special Order
• 75mm Dia. Motors (power: K - M ) - Call to Special Order
• 98mm Dia. Motors (power: K - N ) - Call to Special Order

Step 2: Pick the Cesaroni Propellant kit that you want to fly in your rocket. To be honest, this is the most time-consuming step. Contact us if you need help. We'll direct you to the RockSim software that we use to help pick the right rocket engines for your vehicle. Technical Publication #28 gives you a step-by-step procedure for picking the motors that might work in your rocket.

Step 3: Match the propellant kit that you just selected in step 2 to the appropriate Cesaroni Case.

Q. How do I adjust the ejection charge delay on the Cesaroni motors.

A. You need a special drill tool, called the "Pro-DAT" that allows you to put a hole into the delay grain that makes the coasting time shorter. One delay tool can be used on all 29mm and 38mm motors. Click Here for more information.

Q. Can I use Aerotech propellant in the Cesaroni cases?

A. No. the sizes of the propellant are different and therefore the Pro29^® motor cases are not compatible with any other brand of reload except Cesaroni.

Q. Are there any special tools that are needed to assemble these motors?

A. No. Assembly is simple.

Q. Don't I need to be high-power certified to buy these motor casings?

A. No. You can buy the aluminum casings without being certified. However, you do need to be high-power certified to buy the propellant kits (H size and larger).

Q. Where do I go to get High Power Certified so I can buy the propellant kits?

A. In the United States, there are two organizations that can certify you to fly high power motors. They are the National Association of Rocketry, and Tripoli Rocketry Association. If you are outside of the USA, please click here.

Q. Why isn't there a "one-size-fits" all reloadable-case?

A. Great Question! It has to do with the physics of rocket motors. To make such an motor case, you would have to design it to fit the largest engine. Then smaller motors would have a lot of empty space in them. First of all, this would be inefficient because you're carrying excess weight into the air. The extra space that should be filled with propellant causes problems with the rest of the propellant burning. There are vibrations and acoustics that resonate in the empty chamber that make sustaining thrust difficult. It is a delicate balancing act to design efficient motors. That is why it is called "rocket science" after all. Fortunately, the hard part is done for us by the manufacturers, and we get to enjoy the smooth operation of each well designed motor.

Q. How easy is it to assemble a reloadable rocket motor?

A. It will take you about 5 minutes to put one together. If you want to see how easy it is, watch our YouTube video where we put one together (click here).

Q. What kind of hook should I use to hold the 29mm reloadable engines in my rocket? I noticed that the Apogee web site doesn't have long engine hooks.

A. Aero Pack Engine Retainers. These are useful on rockets that use the 29mm diameter reloadable motors.

I'm glad someone knows what's going on. I had forgotten that I had upgraded to the latest version of RockSim. Not only did you catch my upgrade, but you resolved everything overnight. You did everything but bring me coffee, and I don't drink it anyway." -- Mike Binkley