page_title: Model rocket
section_title: Reloadable motors
hierarchical_section_title: Model rocket / Motor nomenclature / Reloadable motors
caption_attribution_description: English: Taken by Nicholas Cassavaugh (cassavau) 454645645645664 This is a picture of several reloadable motor casings for the Model Rocket page. Includes ruler in both English and Metric units for scale.
context_page_description: A model rocket is a small rocket designed to reach low altitudes and be recovered by a variety of means.
  According to the United States National Association of Rocketry Safety Code, model rockets are constructed of paper, wood, plastic and other lightweight materials. The code also provides guidelines for motor use, launch site selection, launch methods, launcher placement, recovery system design and deployment and more. Since the early 1960s, a copy of the Model Rocket Safety Code has been provided with most model rocket kits and motors. Despite its inherent association with extremely flammable substances and objects with a pointed tip traveling at high speeds, model rocketry historically has proven to be a very safe hobby and has been credited as a significant source of inspiration for children who eventually become scientists and engineers.
context_section_description: Reloadable rocket motors are specified in the same manner as single-use model rocket motors as described above. However, they have an additional designation that specifies both the diameter and maximum total impulse of the motor casing in the form of diameter/impulse. After that, there is a series of letters indicating the propellant type. However, not all companies that produce reloadable motor systems use the same designations for their motors.
  An Aerotech consumer aerospace reload designed for a 29-millimeter-diameter case with a maximum total impulse of 60 newton-seconds carries the designation 29/60 in addition to its impulse specification.
  However, Cesaroni Technology Incorporated (CTI) motors use a different designation. They first have "Pro" followed by a number representing the diameter of the motor in millimeters, for example, a Pro38 motor is a 38mm diameter motor. After this, there is a new string of characters such that the impulse in newton-seconds is first, followed by the motor classification, the average thrust in newtons, followed by a dash, and the delay time in seconds. For example, a Pro29 110G250-14 is a G-motor with 110 Ns of impulse, 250 N of thrust, and a 14-second delay.
caption: Aerotech Reloadable motor cases. From left: 24/40, 29/40-120, 29/60, 29/100, 29/180, 29/240
exif: {"Image ImageDescription": "", "Image Make": "NIKON", "Image Model": "E995", "Image XResolution": "300", "Image YResolution": "300", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Nero PhotoSnap 1, 2, 0, 18", "Image DateTime": "2006:07:29 15:07:48", "Image ExifOffset": "212", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "300", "Thumbnail YResolution": "300", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail Software": "Nero PhotoSnap 1, 2, 0, 18", "Thumbnail DateTime": "2006:07:29 15:07:49", "Thumbnail JPEGInterchangeFormat": "1810", "Thumbnail JPEGInterchangeFormatLength": "4149", "EXIF ExposureTime": "5/43", "EXIF FNumber": "3", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "100", "EXIF ExifVersion": "0210", "EXIF DateTimeOriginal": "0000:00:00 00:00:00", "EXIF DateTimeDigitized": "0000:00:00 00:00:00", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "14/5", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Unknown", "EXIF Flash": "Flash did not fire", "EXIF FocalLength": "23/2", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "72", "EXIF ExifImageLength": "1282", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed"}