Editing Model rocket (section)

===Reloadable motors===

[[Image:WikiReloadableMotorCases.jpg|thumb|right|Aerotech Reloadable motor cases. From left: 24/40, 29/40-120, 29/60, 29/100, 29/180, 29/240]]

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 motors use the same designations for their motors.

An Aerotech 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.<ref name="Cesaroni Technology Inc. (CTI) Pro38 rocket motors">{{cite web |url=http://pro38.com/ |title=Pro-X - A better way to fly |access-date=5 July 2012}}</ref> After this, there is a new string of characters such that the [[impulse (physics)|impulse]] in [[newton-second]]s is first, followed by the motor classification, the average [[thrust]] in [[newton (unit)|newton]]s, 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.<ref>{{cite web |url=http://pro38.com/products/pro29/motor.php |title=Pro29® high power rocket motor reload kits |access-date=5 July 2012}}</ref>