Please bear with me as I develop the sections and feel free to reply with your ideas. I was just posting something and I caught myself constantly using acronyms for various RC terms that I found obvious, but I knew straight away, that some months or years ago, I'd be completely clueless as to what was being written! Therefore, I searched the forum for a glossary/dictionary/acronym translator or anything similar, but failed to find anything of the sort. I figured - I must make one - an OPEN one, where everyone can throw in their TLAs (three-letter acronyms), slang, definitions and other inside terms that we all share in the RC hobby. I will take care of this thread as often as I can and push everything into the OP (original post) in several categories, to make it legible. Please note that all technical explanations are laid out in lay-man's terms and are not text-book definitions. You can find those on Wikipedia or anywhere else! This glossary's purpose is to explain it equally 'well-enough' to the young RC enthusiast as any non-technical adult, wanting to work out what innards to put into their RC vehicle! Please use your browser's search function (usually Ctrl+F) on this page if you're looking for anything in particular. Forum/chat slang & acronyms Some of these may seem obvious to the majority, but I thought it's worth adding for those, who are new to online forums. AFAIK - As far as I know AKA - Also known as BA - Bad-Ass! BBL - Be back later BRB - Be right back BS - Bulls$$t (use in jest only, plz) G2G - Good 2 go, gotta go GTG - Group Trail Gathering (thx Medic), Good to go, gotta go, get-together, gas-turbine generator IC - Internal combustion / I see / In-character IIRC - If I recall correctly IMHO - In My Humble Opinion ITT - In This Thread Mod - Moderator ofc - Of course OMG - Oh My God OP - Original Post TTYL - Talk to you later TYVM - Thank you very much General Terms ARF - Almost ready to fly (not: 'All ready to fly'!) ARR - Almost ready to run BNF - Bind and fly (requires a compatible Tx only) FPV - First Person Video/View. Usually refering to controling an RC craft remotely with the aid of a live video down-link lbf·ft - pound-foot, unit of torque. Equivalent to a pound of force acting at a lever 1 ft away from the pivot point. 1 lbf·ft = 1.3558180 Nm km/h - kilometres per hour, unit of speed MPH - miles per hour, approximately 1.6 km/h, an Imperial unit of speed Nm - newton metre, unit of torque. 1 newton metre = 0.7375621 lbf·ft PnP - Plug'n'Play (requires TX, Rx and battery) PSU - Power Supply Unit RC - Radio-controlled, remote-controlled Rx-Ready - receiver ready kit (requires Tx, Rx and often battery) RTF - Ready to fly (everything in the box) RTR - ready to run (everything in the box) RPM - Revolutions Per Minute - how quickly it rotates Servo - a mechanism used to actuate a moving part in a machine. Consists of a small electronically controlled electric motor, surrounded by a set of gears terminated with a pivoting actuating arm. In RC, most commonly used for various forms of steering the vehicle torque - AKA moment - tendency of a force to rotate an object around its axis. Commonly found as a servo or engine parameter. The more torque, the stronger the servo. Tx - transmitter WOT - wide-open throttle Electric RC A - Amp/ampere - a measure of electrical current. 1A = 1W / 1V Ah - ampere-hour - a unit of energy, commonly used as the capacity of a battery. 1Ah = 1,000 mAh. C - battery charging rate. 1C corresponds to a complete charge/discharge of the whole battery capacity in 1 hour. Therefore, in theory, you can discharge a 60C battery completely in 1 minute, by drawing 60 times more amps than required to discharge it in 1 hour. ESC - Electronic Speed Controller - one of four key systems in any electric RC. It controls the motor's RPM (see General Terms) Kv - Voltage constant K - defines the number of RPM per Volt, that the motor will try to achieve at full throttle with no load on it. In practice, this means that the motor will be turning faster, the more voltage (battery cells in series) you apply to it. With motors of comparable sizes, the one with higher Kv will give you more top speed, whereas the lower Kv one will give you more torque for those rough mud patches. Similarly, in planes, the lower Kv motor will allow a larger prop to be swung, giving more static thrust and higher Kv will allow for super-fast short props or EDFs. Note that, contrary to IC engines, one cannot under-prop / under-gear an electric motor - it will never explode from too little-load causing too much RPM, because of this Kv constant. LiFe - LiFePO4 - Lithium Ferrite (Lithium Iron Phosphate) battery. LiPo - Lithium Polymer battery: a high energy concentration, rechargeable battery. NiCd - Nickel-cadmium rechargeable battery. NiMH - Nickel-Metal Hydride rechargeable battery. V - Volt - unit of electromotive force (voltage). 1V = 1W / 1A W - Watt - unit of power (energy conversion). 1W = 1V * 1A Wh - Watt-hour - unit of energy, sometimes used to define the amount of energy stored in batteries, in place of mAh or Ah. Internal combustion RC Glow fuel - usually a mixture of methanol and nitroethane, suspended in castor or synthetic oil; used to power some internal combustion engines Glow plug - a device similar to a spark plug, used to ignite glow fuel at each stroke of the engine piston Nitro - nitromethane, used as high performance engine and RC engine fuel Kerosene/kerosine/paraffin - highly-flammable hydrocarbon liquid, often used to power jet and some rocket engines.