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Genesis of LMR & HPR.


Definition of Terms
Skill 0=Ready to fly

1=Beginner

2=May require some prior building or flight skill

3=Requires prior experience and either flight or construction has steps not suited to beginners

4=Complex construction or flight experience requiring substantial prior experience and/or mentoring

5=Expert construction or flight issues, but with a concept that is very exciting!
Motors Primary or Host Mount-tm size which typically can accept Interchange Mounts-tm or conversion mounts to smaller motors or clusters of smaller motors.
Recovery Typically can include parachute, streamer, parastreamer, tumble, glide or autorotation. For consumer rockets we shy away from "shovel recovery".
Diameter The main or maximum diameter of the airframe in inches. 25.4mm per inch.
Length The overall length of the rocket in inches.
Weight Typical constructed weight without motors, Interchange Mounts-tm, parachutes, payload, paint. But typically includes glue for middle power flights and sufficient laquer sealer for a smooth surface to accept paint.
Drag (CD) This is a "coefficient" or dimensionless number representing the relative smoothness of the shape of the airframe. A typical very low number is 0.25 such as a rocket with a boattail, and a typical high number is 0.85 if the rocket has protrusions, changes in diameter, a flat base, etc. Multiplying the CD times the frontal area in square inches provides the CDA (sqin) which is a meaningful number of the overall rocket drag, factoring in rocket size. CD applies ONLY to the shape and is independent of size. It applies to all scales of the same shape rocket. Also referred to as CDr for representative drag at "Reynolds numbers" at the flat spot in the CD vs. velocity curve at Reynolds numbers between 10^6 and 10^7. Aerodynamics terms used.
CP(") The Center of Pressure (CP) is typically measured in inches (25.4mm/in) from the tip of the nose cone to a point on the tube a distance up from the fin. This is also referred to as the center of area. This is one of two relevent values when determining rocket stability. The rule for stability is the CG (Center of Gravity) is ahead of the CP by at least one body diameter (caliber). CG is the loaded balance point of the rocket.
SKU# This is our stock number also used by dealers to reorder.
Price This is the manufacturer's suggested retail price. Some locations charge higher prices due to import duties, shipping charges or minimum order charges. We prefer our dealers do not substantially discount from this price to provide market parity between dealers of different types, some with high overhead costs to support the associated service structure consumers apperciate: local retail, mass merchandise, mail order, internet, or launch dealers. When we sell direct we sell at MSRP.


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