Pratt Hobbies, Inc.
Rocketry Catalog
 Innovative Launch Systems and Accessories
for Model Hobbyists

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Home » Hybrid Rocket Motors » Hybrid Accessories


MARSA54L Flight Computer


The MARSA54L is a true flight computer, one of the most programmable and versatile flight controllers available. It has both an accelerometer and an air pressure sensor, and is completely programmable with the onboard display and joystick. A USB port and MarsaConnect software allows easy download and graphing of flight data. Compatible with future MarsaNET wireless products. For detailed information and the users manual, see our Info Pages.

We include an untrabright status LED and cable that can be mounted on the outside of your rocket and allows you to verify flight ready status from 100 feet away (a $6 value). 

Price: $179.00

Fill Hose Extension


If you need more fill hose to connect to your hybrid motor, this 5-foot extension kit will do the job. One end connects to the Module 2 Valve Manifold or similar fill system with 1/8 NPT female connector. The other end accepts the different sized push-to-connect connectors supplied with the ULS-M2 to fit different fill hoses.
Price: $28.95

KRYTOX grease for hybrid motors


KRYTOX grease is specified for most hybrid motors, for lubricating o-rings and any components that come in contact with the oxidizer. Will not react with liquid nitrous oxide. 0.5 ounce tube.
Price: $25.00

Nitrous Oxide Supply Tank, 20 pounds


This 20 pound NOX tank is suitable for all hybrid motors. Supplied with a CGA326 valve thread to match our ULS-M2 and most other hybrid launch systems. Siphon tube installed for upright operation.
Price: $259.00
Out of Stock



Complete set of push-to-connect pressure fittings, as included with the ULS-M2 Valve Manifold.
Price: $45.00

Pressure Gauge Upgrade for Valve Manifold Module


The Pressure Gauge is available separately or as an upgrade to the ULS-M2 Valve Manifold. Tee-fitting with 1/4NPT threads included.
Price: $40.00

Standard Fill Valve


For do-it-yourselfers, our Standard Solenoid Valve is your best choice for hybrid motor fill systems.
Price: $120.00

BFV Oversize Fill Valve


For people who want to build their own fill system, the BFV Oversize Fill Valve has twice the flow capacity of the "standard" fill valve. It draws 2.9 amps of current and does not require "solenoid saver" circuitry.
Price: $190.00



The Econo Valve is a less expensive option for building your own hybrid GSE. It should be used ONLY for smaller (G-H) motors.
Price: $90.00


Guy Help!
Are you clueless when it comes to finding gifts for your Significant Other? Welcome to the club. We found professional help, from a rocket wife who offers Avon products!


For the best in rocketry simulation software and excellent kits, we recommend Apogee Components!

Pratt Hobbies
11556 Platten Rd
Lyndonville, NY 14098