PreferenceMotorBrowserGroupingOption PreferenceUseInternalFileBrowserOpion PreferenceFileBrowserBaseDirectory PreferenceShowOnlyOrkFiles PreferenceAutoSaveOption 0 1 2 3 PreferenceUnitLengthOption mm cm m in ft PreferenceUnitMassOption g kg oz lb PreferenceUnitVelocityOption m/s km/h ft/s mph PreferenceUnitDistanceOption m km ft yd mi nmi AeroTech Alpha Hybrids Animal Motor Works Apogee Components Cesaroni Technology Contrail Rockets Ellis Mountain Estes Industries Gorilla Rocket Motors Hypertek Kosdon by AeroTech Kosdon TRM Loki Research Propulsion Polymers Public Missiles, Ltd. Quest Aerospace R.A.T.T. Works Roadrunner Rocketry Rocketvision Flight-Star Sky Ripper Systems West Coast Hybrids A B C D E F G H I J K L M N O 6 10.5 13 18 20 24 29 32 38 54 64 69 75 76 81 98 152 161