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US 10,731,604 B2Granted
Rocket motor with concentric propellant structures for shock mitigation
AssigneeAerojet Rocketdyne, Inc.
InventorPeter J. Cahill, Jr.
Life of this patent
Estimating the term…
Abstract
A solid rocket motor includes a first solid propellant and a second solid propellant at least partially surrounding the first solid propellant. The second solid propellant is resistant to fragment impact and the first solid propellant has a higher impulse than the second solid propellant.
Claims8
A solid rocket motor comprising:
- a first solid propellant and a second solid propellant at least partially surrounding the first solid propellant, wherein the second solid propellant is resistant to fragment impact and the first solid propellant has a higher impulse than the second solid propellant, wherein the rocket motor has a diameter, and the second solid propellant has a total diametric thickness, as a percentage of the diameter, of 5% to 20%, and the first solid propellant includes nitramine solid oxidizer and the second solid propellant excludes any nitramine solid oxidizer, wherein the first solid propellant has a composition:
- Constituent
- Trade Name
- Function
- Nominal wt %
- Flake Aluminum
- Aluminum
- Ballistic
- ≤0.5%
- Modifier
- Lead Citrate
- Lead Citrate
- Burn Rate
- 2-5%
- Modifier
- Cyclotetramethyl-
- HMX, <3
- Solid energetic/
- 45%-65%
- enetetranitramine
- micron
- gas generator
- Nitrocellulose
- NC
- Energetic
- 0-2%
- Binder
- Trimethylolethane
- TMETN
- Energetic
- 10-20%
- trinitrate
- Plasticizer
- Butanetriol
- BTTN
- Energetic
- 10-20%
- trinitrate
- Plasticizer
- R-18 Polyester
- R-18
- Binder
- 4-6%
- Polycaprolactone
- PCL
- Binder
- 2-4%
- Nitrodiphenylamine
- 2-NDPA
- Stabilizer
- 0.5%-1.0%
- N-Methyl-P-Nitroaniline
- MNA
- Stabilizer
- 0.5%-1.0%
- Hexamethylene diisocyanate
- HMDI
- Curative
- .5-2.0%
- and the second solid propellant has a composition:
- Constituent
- Trade Name
- Function
- Nominal wt %
- Flake Aluminum
- Aluminum
- Ballistic
- ≤0.5%
- Modifier
- Lead Citrate
- Lead Citrate
- Burn Rate
- 2-5%
- Modifier
- Nitrotriazolone
- NTO
- Solid energetic/
- 45%-65%
- gas generator
- Nitrocellulose
- NC
- Energetic
- 0-2%
- Binder
- Trimethylolethane
- TMETN
- Energetic
- 10-20%
- trinitrate
- Plasticizer
- Butanetriol trinitrate
- BTTN
- Energetic
- 10-20%
- Plasticizer
- R-18 Polyester
- R-18
- Binder
- 4-6%
- Polycaprolactone
- PCL
- Binder
- 2-4%
- Nitrodiphenylamine
- 2-NDPA
- Stabilizer
- 0.5%-1.0%
- N-Methyl-P-
- MNA
- Stabilizer
- 0.5%-1.0%
- Nitroaniline
- Hexamethylene
- HMDI
- Curative
- .5-2.0%.
- diisocyanate
114 more elements
Dependencies are inferred from the claim text.