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These "rocket societies" especially flourished in Russia, Germany, and the United States. of space travel but convinced many adults that the idea was absurd.
Table of contents
- 90 Years Ago Goddard’s Liquid-Fuelled Rocket Launched Spaceflight
- AV Bay Electronics Absurdity with the RRC3 Altimeter | The Rocketry Forum
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Similar to Specific Impulse, it is defined as the Total Impulse q. It is determined by taking the Total Impulse q. This carries the potentially confusing units of "seconds" as if it had something to do with the burn duration but is due to weight and thrust both being force parameters hence canceling out e.
This is actually very handy since it makes the term independent of the units system metric or English since they both use "seconds" for time. Impulse Total : A measure of the total momentum imparted to the rocket by the motor. It is defined for those who know calculus as the integrated area under the thrust-time curve.
For the rest of us, it can be thought of as the motor's average thrust times the duration of the burn. Measured in N-sec or Lb-sec. Kicked : A term used to describe a motor which is ejected from the rocket while in flight. This often results in the failure of the recovery system. It is usually caused by not fitting the motor into the motor mount properly. See also "Prang". Kitbash : Taking two or more kits and combining "bashing" them into a new design. Often used as a contest event Team Kitbash, where teams compete, Kitbash Duration, Scale Kitbash, etc where the idea is to be creative in a limited amount of time.
Origin: The term appears to have come from the model railroading hobby where kits for buildings and other diorama items have, for decades, been modified from their original intent to suit the needs of a particular layout.
Krushnic Effect : A very dramatic phenomenon where your rocket makes a tremendous amount of noise and smoke but doesn't go anywhere! This happens when the motor is recessed into the body tube by more than one tube diameter. If so recessed, the cylindrical volume below the motor forms a secondary expansion chamber which allows the exhaust gasses to expand below atmospheric pressure before leaving the rocket.
Surrounding air aspirated into the exhaust stream causes turbulence which negates much of the thrust, along with creating the characteristic roar. A multi-stage model that ejects its booster motor, but not the airframe, is a perfect example. Very damaging; it almost always destroys the lower body tube beyond use.
Named for Richard Krushnic, the rocketeer who characterized the effect in the late '60s. Not to be confused with "Suction Lock" q.
90 Years Ago Goddard’s Liquid-Fuelled Rocket Launched Spaceflight
Upper stages of unstable multi-stage rockets often end up like this, as do some too heavy HPR rockets with long-burning, low thrust motors. Landis Loop : A ring used in a tower launcher to keep the back end of a egglofter centered during launch. Invented by Geoff Landis and named for him by Bob Kaplow.
Lovelace Effect : A phenomenon where the nose cone is apparently "sucked" out of the body right at motor burnout. It is more prevalent on parabola, ogive and other low drag nose shapes. Another possible contributing factor could be the denser air trapped in the body tube from ground level exerting pressure on the nose cone once the rocket reaches a higher altitude. Magnelite TM ; : An ignitor made by Rocketflite used mainly to start composite motors.
A medium power device amps at 12 volts , it requires significantly more than an electric match q. They come both single and double dipped, depending on how much "oomph" you need. The head is quite large so they work best in 29mm and larger motors. Midwest Qualified : During the 's, NAR contest flyers circulated a persistent rumor that meets held on the East Coast were held to a much higher standard of flight qualification than those flown in the Midwest. The Contest Board steadfastly maintained that contest rules were uniformly enforced.
If an RSO qualified a flight that many people felt should not have been, his or the flyer's geographical location came under scrutiny. While no rule changes or procedures were modified, flyers continue to refer to those marginal flights squeak through as "Midwest Qualified. A collection of wreckage of NARAM's prangs, large and small, were attached to a large sheet of cardboard, along with local flora, fauna, tourist brochures, food wrappers, etc. Nomination was cause for pain enough, but winning made one a legend in his own time.
AV Bay Electronics Absurdity with the RRC3 Altimeter | The Rocketry Forum
A rocket that disappears with no sign of the recovery system deployment, and no other obvious failure mode e. Prang or CATO. Sometimes called "into orbit. Minimum Diameter : A rocket built with the smallest possible diameter body tube for the size of motor casing. Usually done to reduce drag in sport or competition models even though it can increase the difficulty of attaching fins and recovery systems. See also "Boosted Dart". Model Rocket : An aero-vehicle that ascends into the air by means of a reaction motor, but without the use of aerodynamic lifting surfaces.
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The restrictions, as defined in NFPA , are as follows:. The gross launch weight, including motor s , will not exceed grams. All components of said vehicle will be of wood, paper, rubber, breakable plastic or similar material and without substantial metal parts.
Published as an insert to MRM q. After MRM folded, it was again published stand-alone and gradually expanded to a magazine style format. Modroc : Model Rocket. Also seen as 'modrocer', or similar spelling, to mean 'model rocketry enthusiast'. Motor : Something that imparts or produces motion, such as a machine or engine.
Notable on the staff was a young Jay Apt, who went on to join the astronaut corps and has made several Space Shuttle flights. Despite the crude graphics and generally marginal production values, the magazine was treasured by its small band of followers and copies are in great demand today. Photocopies are circulated by an "old boy network" at meetings and swaps.
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Thus we now have TWO rocket hobby magazines on the newsracks today! Started by Vern Estes and his small crew in , it is still sent to all of Estes's active mail order customers. Somewhat sophomoric in style, it contains a great deal of practical information, especially for beginners.
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It has survived a bewildering array of changes in format over the years, but is still published three or four times annually. Current editor: Mike Hellmund. A national hobby organization promoting model and high power rocketry in the United States. The NAR promotes rocketry related sport flying, competitions, and education. The NAR national championships competition, held in August of each year. An annual event sanctioned by the NAR oriented towards non-competitive i.
A service provided by the NAR for both members and non-members. NARTS stocks rocket plans, technical reports, and other items of interest to rocketry enthusiasts. NARTS may be reached at:. An annual, national sport fly sanctioned by the NAR. A private for-profit organization responsible for crafting rules and regulations dealing with fire safety issues which are beyond the expertise of local agencies.
It gathers experts in various fields to write safety regulations for adoption by local fire agencies at the discretion of the Fire Marshal. This document defines a model rocket as having less than 1, grams total launch weight, containing less than grams of fuel no more than The draft provisions of not yet ratified defines HPR as follows:.
High power rockets have no total weight limits, but do have a single motor limit of no more than O power 40, NS total impulse and have a total limitation of 81, NS total impulse.