RATTworks: Precision Hybrid & Tribrid Rocket Motors

29mm Hybrid Motors

(interactive tutorial)

The H70, I80, and I90 hybrids are certified by the Tripoli Rocketry Association

Click here to download the 29mm Hybrid Instructions (960KB PDF)

Components of a RATTworks 29mm hybrid motor:

1. Motor casing and oxidizer tank (Monotube)
2. Polypropylene fuel grain
3. Floating injector
4. Graphite nozzle
5. Forward bulkhead
6. Rear nozzle enclosure
7. Fill hose (type H 1/8" nylon)
8. 1/16" compression fitting
9. O-rings

Fully assembled 29mm hybrid motor.

Compression fitting to HyperTEK N₂O hose adapter.

Close up of the aft section of the motor.

Filling of the H70 hybrid motor. Venting indicates that the tank is full and the motor is ready for firing.

Static firing of the RATTworks H70 29mm Hybrid Motor. (Note: Mach diamonds are clearly visible.)

H70 and I80 hybrid motors, beautifully anodized and laser etched. Not pictured: I90 hybrid motor.

Videos of H70 hybrid motor flights - courtesy of Pratt Hobbies.
1,513KB 352 x 240 00:31 MPEG	709KB 352 x 240 00:16 MPEG

H70 Hybrid Motor	$59.95
I80 Hybrid Motor	$79.95
I90 Hybrid Motor	$99.95
Three (3) H70/I80 reloads	$24.95
Three (3) I90 reloads	$34.95

H70

Thrust curve - click to enlarge

Diameter: 29mm
Length: 18" (457mm)
Average Thrust: 15.4 lbs. (68.5 N)
Peak Thrust: 34.5 lbs. (153.5 N)
ISP: 167.3 sec.
Burn Time: 2.57 sec.
Weight (Empty): 207.5 g
Weight (Loaded w/o N2O): 251.5 g
Weight (Loaded w/ N2O): 352.7 g
N2O Weight (750 PSI): 0.223 lbs. (101.2 g)
Tank Volume: 8.29ci (135.8cc)

I80

Thrust curve - click to enlarge

Diameter: 29mm
Length: 28.75" (730mm)
Average Thrust: 17.4 lbs. (77.4 N)
Peak Thrust: 36.6 lbs. (162.7 N)
ISP: 168.7 sec.
Burn Time: 4.73 sec.
Weight (Empty): 303 g
Weight (Loaded w/o N2O): 347 g
Weight (Loaded w/ N2O): 553.1 g
N2O Weight (750 PSI): 0.454 lbs. (206.1 g)
Tank Volume: 16.87ci (276.4cc)

I90

Thrust curve - click to enlarge

Diameter: 29mm
Length: 36.25" (921mm)
Average Thrust: 17.0 lbs. (75.8 N)
Peak Thrust: 39.1 lbs. (174.1 N)
ISP: 170.7 sec.
Burn Time: 6.43 sec.
Weight (Empty): 366 g
Weight (Loaded w/o N2O): 425 g
Weight (Loaded w/ N2O): 694.2 g
N2O Weight (750 PSI): 0.593 lbs. (269.2 g)
Tank Volume: 22.05ci (361.3cc)

All Ratt motors (ThrustCurve.org)