Model Rocketry and Siege Engine Glossary Letter H


Model Rocketry and Siege Engine Glossary Letter H

Glossary
#´s |A |B |C |D |E |F |G |H |I |J |K |L |M |N |O |P |Q |R |S |T |U |V |W |X |Y |Z |

Hand-Launch-Glider
A small robust glider designed to be launched by hand
Hardware
Finished pieces of equipment or component parts that constitute or go to make up an operating machine or device such as a missile or vehicle
Hatch
A door in the side of a spacecraft or aircraft
HD
Helicopter Duration; a competitive event in NAR-sanctioned launches, using rockets with helicopter recovery
Heads-up
An alert called by the Launch Control Officer if one of three conditions prevail:
  • A model using an advanced technique such as a cluster is about to be launched
  • An untried rocket design is about to launch and the results are uncertain
  • A recovery system has failed, and it is possible that the rocket will crash in an area containing people
Headwind
Wind blowing generally into the front of an aircraft, thereby slowing its ground speed
Helicopter Recovery
A method of model rocket recovery in which long blades are deployed at apogee so that the rocket descends gently through auto-rotation
Hershey Bar Wing
A rectangular wing, with no taper on either the leading or trailing edge
HLG
See Hand-Launch-Glider
HPR
see High Power Rocketry
High Power Rocketry
High power rockets are defined as having: a single motor with more than 160 Newton-seconds total impulse or an installed impulse of 320 Newton-seconds and no more than 40,960 Newton-seconds, and an average thrust in excess of 80 Newtons. (H through N range)
Hybrid
A type of reusable rocket motor in which the fuel and oxidizer are kept separate and in different material states (such as a compressed liquid and a solid) until combustion occurs. A typical hybrid motor currently uses hydrogen peroxide gas as an oxidizer, and cardboard or plastic as fuel
Hypergolic
An arrangement of liquid fuel and oxidizer which ignites spontaneously when combined
Hypersonic
Term used to describe a vehicle exceeding Mach 5


Have something to add? Just send it along.