aircraft are similar to Ready to fly aircraft, except they do not come with a transmitter. Because they do not come with a transmitter, they must be bound to one instead. This is desirable for flyers that already own a transmitter. Like RTF aircraft, Bind-N-Fly models require minimal assembly. There are several incompatible radio standards often found with Bind-N-Fly models. Most commonly seen are the BNF and Tx-R designations. BNF models work with transmitters using the DSM2/DSMX standard, and Tx-R models use the Tactic/AnyLink standard. A programmable transmitter which can store custom parameters for multiple models is desirable so that trim and other advanced functions do not need to be altered when switching models. Receiver Ready (Rx-R) models are similar to BNF models in that they are mostly assembled but let the user add their own receiver and battery, avoiding the need to deal with transmitter incompatibilities. Plug-N-Play (PNP) A Plug-N-Play (PNP) electric RC airplane has the motor, ESC and servos installed but is missing the transmitter, receiver, and motor battery pack (& charger). In other words, the airplane comes 99% assembled just like an RTF one does, but you need to supply your own transmitter, receiver, and battery pack. Plug-N-Play radio control planes are the perfect answer for aeromodellers who want to buy and fly more than one RTF RC plane, but don't want to have a separate transmitter for each one. Wood Kit Wood kits come in many sizes and skill levels. The wood, typically balsa and light ply, may either be cut with a die-cut or laser. Laser cut kits have a much more precise construction and much tighter tolerances, but tend to cost more than die-cut kits. Wood kits include the raw material needed to assemble the airframe, a construction manual, and full-size plans. Assembling a model from plans or a kit can be very labor-intensive. In order to complete the construction of a model, the builder typically spends many hours assembling the airframe, installing the engine and radio equipment, covering it, sometimes painting it, installing the control surfaces and pushrods, and adjusting the control surfaces travels. The kit does not include necessary tools, so they must be purchased separately. Care must be taken when building models from wood kits since construction flaws may affect the model's flying characteristics or even result in structural failure. Smaller balsa kits will often come complete with the necessary parts