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Guidelines for 9 inch-229mm, 12 inch-304mm,
18 inch-456mm, 24 inch-608mm, 36 inch-912mm
Solid and Hybrid Rocket Motors

Burning time and thrust level depends on grain geometry and propellant speed, or hybrid oxidizer flow rate. Motor nozzle length varies with launch altitude, generally add 1.5x diameter to grain length for sea level, 2.5x for >80k feet. Add 20% to overall length for hybrids. Case weights are overestimated assuming aluminum case. Steel or carbon fiber lower.
229mm or 9" OD Rocket Motor Sizing Guidelines
Grain
Length
Propellant
Mass LB
Casing
Mass LB
Total Impulse LB-SEC
48"144.72134,021
96"289.54268,042
144"418.863105,468
192"558.484140,623
304mm or 12" OD Rocket Motor Sizing Guidelines
Grain
Length
Propellant
Mass LB
Casing
Mass LB
Total Impulse LB-SEC
48"2694063,215
96"53880126,430
144"807120189,645
192"1,038156243,930
240"1,298195305,030
456mm or 18" OD Rocket Motor Sizing Guidelines
Grain
Length
Propellant
Mass LB
Casing
Mass LB
Total Impulse LB-SEC
48"59689140,060
96"1,193178280,120
144"1,790268420,180
192"2,386357560,225
608mm or 24" OD Rocket Motor Sizing Guidelines
Grain
Length
Propellant
Mass LB
Casing
Mass LB
Total Impulse LB-SEC
48"1,076161252,860
96"2,153322505,720
144"3,230484758,580
192"4,3076451,011,414
912mm or 36" OD Rocket Motor Sizing Guidelines
Grain
Length
Propellant
Mass LB
Casing
Mass LB
Total Impulse LB-SEC
48"2,532379595,020
144"7,5961,1371,785.060
192"10,1271,1562,380,079
240"12,6601,8952,975,100
288"15,1922,2743,570,120
432"22,7883,4115,355,180
Flight clearances, launch pad, launch site, logistics, casing fixtures, and on-board systems available.


carbon rocket
12" diameter airframe with CF tube, FG nose cone,
CF fins and AL center section. Hmmm.


| 54mm (2.125") | 75mm (3") | 98mm (3.875") |
| 152mm (6") | 229mm (9") | 304mm (12") |

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