Rattworks H70 I80 I90 Hybrid Rocket Reload Kit

Rattworks H70 I80 I90 Hybrid Rocket Reload Kit
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Manufacturer: RATTWorks Motors
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Rattworks hybrid reload kit for H70, I80 and I90 hybrid rocket motors

Each kit contains:
3 fuel grains
3 graphite nozzles and sleeves
3 Paper sheath for nylon fill hose
olives for compression fittings (brass items in picture) (yes, they are called olives)

You supply:
Igniter grain
Electric Match
Assembly grease

Components of a RATTWorks motor are:

Motor casing and oxidizer tank, one piece

Floating Injector

Forward Bulkhead

Rear nozzle enclosure


Expendable components of the RATTWorks motor (reload kit) are:

Polypropylene fuel grain
Graphite nozzle
Fill hose (type H 1/8" nylon) 

1/16" compression fitting

Each reload kit includes 3 each of these expendables.

H70 and I80 use the same reload kit, the I90 uses a different reload available by choosing the correct product above

H70 and I80 reload kit shown at top of page, I90 reload kit shown below


See how this motor works here, a graphic tutorial by Andrew MacMillen


Get the full instruction sheet for this motor here:

Download instructions 960 k pdf


Take a look at a Ratt Reload tutorial here

H70 Motor Specifications:

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)

Thrust Curve


I80 Motor Specifications:

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)

Thrust Curve

I90 Motor Specifications:

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)

Thrust Curve

If you are interested in making your own nozzle, here are the dimensions of the H70 nozzle courtesy of Dan Winter:

Total length of the nozzle stock is.964", total OD for stock piece is.745".  Forward turned down step is .155" long with an OD of.585 "diam., the aft step down is .325" long at .615" OD.  
The forward ID of nozzle throat is.285" at.155" in length approx.45degree taper inward to the throat, with the aft taper ID out to .485" for .814" in length.   Both ends of the nozzle throats have unmachined lips of .065" aft, and  .055 for the forward lip.

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