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Specifications for 38mm casings pre-June 2015. Later models have the thrust ring placed .320" from the end of the case.

Specifications for the original style 38mm bulkheads.

NOZZLE NUMBERS:  Every nozzle is engraved with a number indicating the throat size in 64ths of an inch.  For example, a #24 nozzle has a 24/64" = 0.375" throat diameter.  Isn`t that nice?  No more guessing what that nozzle in the bottom of your range box is.

Suggested EX Nozzle throats are based on the use of typical packable EX propopellant formulations and are meant as a starting point.

The best throat sizes for each hardware size are based off of the desired operating chamber pressure, which is dependant upon the specific propellant formulation, processing methods and grain geometry used.

Motor
Diameter
Case
Length
Case Wall  Aprox. Total
Impulse
Liner
length
Max Propellant
Length
ID of
casting
tube
Commercial Nozzle throat Suggested EX Nozzle
throat
Typical Bates Grain Geometry
29 mm 5.5" 0.058" 120 3.5" 3.25"     #13 Two 1-5/8" long grains with 3/8" cores
29 mm 7" 0.058" 180 5.12" 4.88"     #15 Three 1-5/8" long grains with 3/8" cores
29 mm 8.6" 0.058" 240 6.75" 6.35"     #18 Four 1-5/8" long grains with 3/8" cores
29 mm 11.8" 0.058" 360 10" 9.75"     #22 Six 1-5/8" long grains, four with 3/8" cores and two with 7/16" cores
29 mm 15.1" 0.058" 460 13.25" 13"     #25 Six 1-5/8" long grains, four with 3/8" cores and two with 7/16" cores, plus one 3-1/4" grain with a 7/16" core
                   
38 mm 7" 0.083" 240 5.063" 4.6" 1.212" #16 #16 Two 2" long grains with 1/2" cores
38 mm 11.5" 0.083" 480 9.56" 8.6" 1.212" #19 #22 Four 2" long grains with 1/2" cores
38 mm 16" 0.083" 740 14.063" 13.6" 1.212" #22 #28 Two 2" long grains with 9/16" cores and four 2" long grains with 1/2" cores
38 mm 24.625" 0.083" 1200 22.625" 21.75" 1.212" #28 #28 Six 3.625" long grains with 1/2" cores. (Hold on tight)
                   
54 mm NA 0.094" NA 7.25" 6.75" 1.755"   #24 Two 3.25" long grains with 5/8" cores
54 mm 12.875" 0.094" 1200 10.375" 9.813" 1.755" #24 #29 Three 3.25" long grains with 5/8" cores
54 mm  15.875" 0.094" 1600 13.4" 12.84" 1.755"   #33 Four 3.25" long grains with 5/8" cores
54 mm 19.375" 0.094" 2000 16.9" 16.25" 1.755" #29 #36 Four 3.25" long grains with 5/8" cores and one 3.25" long grain with 3/4" core

54mm

Gen2

28.625

28.525"

0.094" 2800 26.05"-27.13" 25.48- 26.68" 1.755" #42 or Single Use #44 Six 4" long grains with 13/16" cores.

54mm

Gen2

43.85

43.75"

0.094" 4000 42.375" 41.92" 1.755"  Single Use  

Gen2 - End margins are 0.200" - Distance from front of thrust ring to back of case is now 0.425".  This is now the same as all other current 54mm Loki Research cases.

                   
76 mm 14.5" 0.116" 2400 11.43" 10.75" 2.551"  #32 #32 Two 5" long grains with 5/8" cores
76 mm 19-5/8" 0.116" 3600 16.875" 15.75" 2.551" #40 #40 Three 5" long grains with 3/4" cores
76 mm 25" 0.116" 4800 21.5" 20.75" 2.551"   #48 Four 5" long grains with 7/8" cores
76 mm 30-7/8" 0.116" 6000 27.188" 26.05" 2.551" #52 #52 Four 5" long grains with 7/8" cores and one 5" long grain with a 1" core
76 mm 40-7/8" 0.116" 8000 37.188" 36.05" 2.551" #56 #60 Five 6" long grains with 1" cores and one 6" long grain with a 1-1/8" core
 Historical Information Only  Below   Not In Production    
98 mm 18" 0.188" 5000 13.75" 12" 3.225"   #44 Two 6" long grains with 1.25" cores
98 mm 24" 0.188" 7500 19.75" 18" 3.225"   #52 Three 6" long grains with 1.25" cores
98 mm 30" 0.188" 10000 25.75" 24" 3.225"   #60 Four 6" long grains with 1.25" cores
98 mm 40" 0.188" 13000 36.125" 35.5" 3.225" #64 #76 Six 5-5/8" long grains with 1.5" cores
98 mm 47-7/8" 0.188" 16000 44.063" 42.5" 3.225"   #80  
                   
114 mm 18" 0.237" 6000 13.75" 12" 3.8"   #48 Two 6" long grains with 1.5" cores
114 mm 24" 0.237" 9000 19.75" 18" 3.8"   #60 Three 6" long grains with 1.5" cores
114 mm 30" 0.237" 12000 25.75" 24" 3.8"   #64 Four 6" long grains with 1.5" cores
114 mm 52" 0.237" 22000 45.75" 44" 3.8"   #90  

O-ring Info

Motor Size ID OD Width Dash number
29 mm 7/8" 1" 1/16" 020
38 mm 1-1/8" 1-3/8" 1/8" 215 or 216*
54 mm 1-5/8" 1-7/8" 1/8" 223
76 mm 2-1/2" 2-3/4" 1/8" 230
98 mm Nozzle (carrier insert) 2-3/4" 3" 1/8" 232
98 mm 3-1/4" 3-1/2" 1/8" 236
114 mm Nozzle (carrier insert) 2-3/4" 3" 1/8" 232
114 mm  3-3/4" 4" 1/8" 240
152 mm 5" 5.5" 1/4" 429

* In 38mm -215 or -216 can be used.  The smaller -215 rings are a tight fit and can be difficult to remove from the nozzle.  The larger -216 rings are a loose fit and can be harder to push into the case.  I use -215 for both Buna-N and Silicone ring material for use in Loki Research reloads.

38mm Delay o-rings are -113

54mm Standard Smoke o-rings are -120

54mm Extended Bulkhead smoke and 76mm smoke grain o-rings are -121

54mm Extened Bulkhead Liner Shoulder o-ring is -130

76mm Standard Bulkhead Liner Shoulder o-ring is -143





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