Pratt Hobbies, Inc.
Rocketry Catalog
 Innovative Launch Systems and Accessories
for Model Hobbyists
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Contrail Rockets L369 Reload Kit
Contrail Rockets L369 Reload Kit

Details 
One fuel grain and parts for the CR-75-3200 Contrail motor casing set with Slow nozzle and Medium combustion chamber. Tripoli certified as L369. Sparky fuel composition.
Price: $95.00
Out of Stock
Contrail Rockets J800 3-Pack Reload Kit
Contrail Rockets J800 3-Pack Reload Kit

Details 
Three-pack of J800 reloads for the Contrail 38mm motor system. Requires 48 inch casing and XXF Upgrade Kit.
Price: $80.00
Out of Stock
Contrail Rockets G234 3-Pack Reload Kit
Contrail Rockets G234 3-Pack Reload Kit

Details 
Three-pack of G234 reloads for Contrail 38mm motor system. Requires 28 inch casing and Fast nozzle.
Price: $60.00
Out of Stock
Contrail Rockets G300 3-Pack Reload Kit
Contrail Rockets G300 3-Pack Reload Kit

Details 
Three-pack of H248 reloads for the Contrail 38mm motor system. Requires 16 inch casing and Fast nozzle.
Price: $50.00
Out of Stock
 
Contrail 98mm 5300cc Hardware Set

Details 
Contrail 98mm (4 inch) diameter Motor Casing Set, with all required hardware for currently certified M1575 and M2800 loads.
Price: $1,000.00
Out of Stock
 
Contrail 98mm M1575 Black Gold Reload

Details 
Single use reload kit for the Contrail Rockets 98mm hybrid motor system.
Price: $200.00
Out of Stock
 
Contrail Rockets 98mm M2800 Reload Kit

Details 
Single use reload kit for the Contrail Rockets 98mm hybrid motor system.
Price: $225.00
Out of Stock
Contrail Rockets K300 Reload Kit
Contrail Rockets K300 Reload Kit

Details 
One fuel grain and parts for the CR-75-2050 Contrail motor casing set with Slow nozzle and Short combustion chamber. Tripoli certified as K300. Black Smoke fuel composition.
Price: $85.00
Out of Stock
Contrail Rockets K404 Reload Kit
Contrail Rockets K404 Reload Kit

Details 
One fuel grain and parts for the CR-75-2050 Contrail motor casing set with Slow nozzle and Short combustion chamber. Tripoli certified as K404. Sparky fuel composition.
Price: $85.00
Out of Stock
Contrail Rockets K630 Reload Kit
Contrail Rockets K630 Reload Kit

Details 
One fuel grain and parts for the CR-75-1400 Contrail motor casing set with Medium nozzle and Mini combustion chamber. Tripoli certified as K630. Sparky fuel composition.
Price: $75.00
Out of Stock
Contrail Rockets K707 Reload Kit
Contrail Rockets K707 Reload Kit

Details 
One fuel grain and parts for the CR-75-1400 Contrail motor casing set with Medium nozzle and Mini combustion chamber. Tripoli certified as K707. Black Gold fuel composition.
Price: $75.00
Out of Stock
Contrail Rockets L800 Reload Kit
Contrail Rockets L800 Reload Kit

Details 
One fuel grain and parts for the CR-75-3200 Contrail motor casing set with Medium nozzle and Medium combustion chamber. Tripoli certified as L800. Sparky fuel composition.
Price: $95.00
Out of Stock
Contrail Rockets 54mm 28 inch Motor Hardware Set
Contrail Rockets 54mm 28 inch Motor Hardware Set

Details 
Contrail 54mm 28 inch long hybrid motor hardware set, with one nozzle speed. Select the nozzle speed required by the load you want to fire when you order the hardware set.
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Price: $215.00
Out of Stock
Contrail 54mm J234 Reload Kit
Contrail 54mm J234 Reload Kit

Details 
One J234 reload for Contrail 54mm hybrid motor. Includes injector orifice, fill line, igniter. Requires 36 in. 54mm casing with Slow nozzle and single port injector.
Price: $44.00
Out of Stock
Contrail 54mm K234 Reload Kit
Contrail 54mm K234 Reload Kit

Details 
One K234 reload for Contrail 54mm hybrid motor. Includes injector orifice, fill line, igniter. Requires 48 in. 54mm casing with Slow nozzle and single port injector.
Price: $44.00
Out of Stock
Contrail Rockets 152mm Hybrid Motor Hardware
Contrail Rockets 152mm Hybrid Motor Hardware

Details 
Complete 152mm(6 inch) diamater, 15000 cc Motor Hardware System.
Price: $2,495.00
Out of Stock
 
Contrail 54mm Single Port Injector Assembly

Details 
Single port injector for Contrail 54mm hybrid motors. Fits all casing lengths. Used with Slow, Med/Fast, and XFast nozzles.
Price: $45.00
Out of Stock
Contrail Rockets I155 3-pack Reload Kit
Contrail Rockets I155 3-pack Reload Kit

Details 
Three-pack of I155 reloads for the Contrail 38mm motor system. Requires 28 inch casing and Slow nozzle.
Price: $60.00
Out of Stock
Contrail Rockets K678 Reload Kit
Contrail Rockets K678 Reload Kit

Details 
One fuel grain and parts for the CR-75-2050 Contrail motor casing set with Medium nozzle and Short combustion chamber. Tripoli certified as K678. Black Gold fuel composition.
Price: $85.00
Out of Stock
Contrail 54mm K321 Reload Kit
Contrail 54mm K321 Reload Kit

Details 
One K321 reload for Contrail 54mm hybrid motor. Includes injector orifice, fill line, igniter. Requires 48 in. 54mm casing with Medium nozzle and single port injector.
Price: $44.00
Out of Stock
Contrail 54mm 36 inch Motor System
Contrail 54mm 36 inch Motor System

Details 
Contrail 54mm 36 inch long hybrid motor hardware system. Includes all four nozzles (slow, med/fast, XFast, XXFast), forward bulkhead and two injector assemblies (standard and XXFast).
Price: $360.00
Out of Stock
Contrail 54mm J416 Sparky reload kit
Contrail 54mm J416 Sparky reload kit

Details 
One J416 Sparky reload for Contrail 54mm hybrid motor. Includes injector orifice, fill line, igniter. Requires 36 in. 54mm casing with Medium nozzle and single port injector.
Price: $44.00
Out of Stock
 
Contrail 54mm 36 inch Motor Casing Only

Details 
54mm, 36 inch long motor casing for Contrail hybrid motors. No internal parts or nozzles are included.
Price: $115.00
Out of Stock
Contrail 54mm K265 Reload Kit
Contrail 54mm K265 Reload Kit

Details 
One K265 Sparky reload for Contrail 54mm hybrid motor. Includes injector orifice, fill line, igniter. Requires 48 in. 54mm casing with Slow nozzle and single port injector.
Price: $44.00
Out of Stock
Contrail 54mm J272 Reload Kit
Contrail 54mm J272 Reload Kit

Details 
One J272 reload for Contrail 54mm hybrid motor. Includes injector orifice, fill line, igniter. Requires 36 in. 54mm casing with Slow nozzle and single port injector.
Price: $44.00
Out of Stock
Contrail 54mm J292 Reload Kit
Contrail 54mm J292 Reload Kit

Details 
One J292 Sparky reload for Contrail 54mm hybrid motor. Includes injector orifice, fill line, igniter. Requires 28 in. 54mm casing with Slow nozzle and single port injector.
Price: $44.00
Out of Stock
Contrail 54mm K555 Reload Kit
Contrail 54mm K555 Reload Kit

Details 
One K555 reload for Contrail 54mm hybrid motor. Includes injector orifices, fill lines, igniter. Requires 48 in. 54mm casing with X-Fast nozzle and three port injector.
Price: $54.00
Out of Stock
Contrail 54mm 28in Motor System
Contrail 54mm 28in Motor System

Details 
Contrail 54mm 28 inch long hybrid motor hardware system. Includes all four nozzles (slow, med/fast, XFast, XXFast), forward bulkhead and two injector assemblies (standard and XXFast).
Price: $340.00
Out of Stock
GO BOX Launch System
GO BOX Launch System

Details 
The GO BOX is a simple, inexpensive system that will fire any igniter. It uses any 12 volt battery (or your car battery with the optional cigar lighter plug) to provide plenty of power. The system comes with a 25 foot cable that plugs into the control box. Extensions are available.
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Price: $49.95
Out of Stock
Arduino Experimenter's Kit
Arduino Experimenter's Kit

Details 

The Arduino Experimenter's Kit will get you started building devices with the Arduino operating system. Complete instructions are included, along with:

  • solderless breadboard
  • jumpers
  • USB cable
  • ultrasonic range sensor
  • 3 LEDs
  • speaker
  • IR receiver
  • photocell 
Price: $80.00
Out of Stock
ULS Module 2: Valve Manifold
ULS Module 2: Valve Manifold

Details 
The ULS-M2 Valve Manifold attaches to a nitrous oxide supply tank and connects to control circuitry in the ULS-M1 Base Module. It allows you to fill and fire floating-injector hybrid motors. Adapters are included for all common hybrid motor fill tubes. Options include a pressure gauge and the BFV oversize fill valve.
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Price: $275.00
Out of Stock
SIXPACK Multiple Launch Controller
SIXPACK Multiple Launch Controller

Details 
The SIXPACK is perfect for clubs and large groups. It controls up to six launch pads from a central Launch Control box. Any 12 volt battery may be used to power the system. Any launch pads may be used.
Price: $149.95
Out of Stock
GO Box 25 Foot Extension Cable
GO Box 25 Foot Extension Cable

Details 
The GO Box Extension Cable adds 25 feet to the distance between you GO Box controller and the launch pad. Extension Cables can be connected together for any length you want. Also works for the FullBoost launch system.
Price: $11.00
Out of Stock
Pad Relay Module
Pad Relay Module

Details 
The Pad Relay Module converts your conventional 12 volt launcher into a high power relay ignition system. The PRM connects a 12 volt battery at the pad directly to your igniters through a 40-amp relay. Any launch system capable of supplying 12 volts can be used to activate the PRM. Perfect for clusters and high-current igniters!
Price: $24.00
Out of Stock
SL1 Kevlar Thread
SL1 Kevlar Thread

Details 
SL1 Kevlar Thread is suitable for parachute shroud lines or shock cords on lightweight contest models. Pre-cut 20 foot package.
Price: $2.00
Out of Stock
SL1 Kevlar Thread, Custom length
SL1 Kevlar Thread, Custom length

Details 
SL1 Kevlar Thread is suitable for parachute shroud lines or shock cords on lightweight contest models. We will cut any length you need at the same price as the pre-cut package. Simply order the number of feet you need.
Price: $0.10
Out of Stock
Pressure Gauge Upgrade for Valve Manifold Module
Pressure Gauge Upgrade for Valve Manifold Module

Details 
The Pressure Gauge is available separately or as an upgrade to the ULS-M2 Valve Manifold. Tee-fitting with 1/4NPT threads included.
Price: $45.00
Out of Stock
SL2 Kevlar Yarn
SL2 Kevlar Yarn

Details 
SL2 Kevlar Yarn is suitable for shock cords on lightweight models. This is what we use in our kits. Flameproof Kevlar will not burn through like elastic shock cord. 20 foot length.
Price: $3.00
Out of Stock
Standard Fill Valve
Standard Fill Valve

Details 
For do-it-yourselfers, our Standard Solenoid Valve is your best choice for hybrid motor fill systems.
Price: $150.00
Out of Stock
BFV Oversize Fill Valve
BFV Oversize Fill Valve

Details 
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: $245.00
Out of Stock

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Pratt Hobbies
11556 Platten Rd
Lyndonville, NY 14098
571-221-5820

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