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Shipping regulations require all motors to be shipped via ground transportation. Smaller motors may be shipped using the US Postal Service. eRockets is an authorized shipper of motors via USPS.
Single-Use = SU there are a small number of delay length choices (4/7/10/13 seconds), and they cannot be altered.
EconoJets are SU's, except limited to F impulse. With limited delay choices.
Economax motors are also SU but are all 80Ns or above impulse.
Metalstorm-propellant High Power SU motors require a L1-certification to purchase. With limited delay choices.
"Model Rocket" reloads are specifically for the 29/40-120 Hobby Line casing. With 1 or 2-grain configurations (1-grain motors include cardboard spacers). You can choose the delay, but since this is a motor you have to assemble, the delay grain is separate and so you can modify the delay. This is one of the most popular systems amongst mid-power flyers.
Loadable Motor System(LMS) to get around shipping restrictions. It is a single-use motor that has to assemble.
High-power RMS reloads specify which casing they are used in. Or use the adaptable casing, it lets you use fewer motor grains in a case than the case was designed for.
New high-power Disposable Motor System, use the Delay Adjustment Tool to optimize the delay.