Introduction to Lithium Polymer (Li Poly) Batteries

Lithium Batteries are found in many modern electronic devices, such as laptops and cell phones. They are significantly lighter than NiMH or NiCD batteries, and have higher capacity for the same size. Over the last five years they have worked their way into the hobby market, for use in electric RC helicopters, boats, cars, and particularly rc model airplanes. Their light weight and high capacity make them ideal for long flight times, while also providing more power. Voltage, Cell Count And C Rating: The nominal voltage of each cell is 3.7V, but can go down to 3.3V during discharge, and up to 4.2V when fully charged. A battery pack is usually composed of two or more cells put together in series for increased voltage, or in parallel for increased capacity. The C rating denotes how quickly a battery can be discharged (a rating of 1C continuous would mean that a 2000mAh battery should not be discharged any faster than 2000mA or 2A, which would take one hour). A 2000mAh pack rated at 12C continuous would be able to discharge at 12 times its capacity (12 x 2000mA = 24000mA or 24A) at which rate it would discharge in 1/12th of an hour. If you know how much continuous current you will be drawing and the capacity of the pack you want to use, you can easily determince what C rating you require. If you are drawing 5A from a 1320mAh pack, just take the current and divide by the capacity: 5A = 5000mA, 5000mA / 1320mAh = 3.8C. Using a pack with a higher C rating than you require will leave some headroom, and extend the life of your battery. Batteries are also given a C rating in terms of burst, which is how quickly the battery is able to discharge for a short period. A burst rating of 20C would mean a 2000mAh battery could supply 20 x 2000mA = 40000mA or 40A for a few seconds at a time. Naming Conventions: Lithium Batteries are also know as LiPo, Li-Po, LiPoly, or Li-Poly. The pack configuration is denoted by the number of cells in series and the number of cells in parallel. A 3s2p pack would have three cells in series, and 2 cells in parallel, using a total of 3×2=6 cells. A 4000mAh 3s2p pack would have a capacity of 4000mAh, and a voltage of 11.1V (3 x 3.7V). It would internally consist of six 3.7V 2000mAh cells. The cells would be doubled up (the 2p part of 3s2p) to get 4000mAh, and there would be three in series (the 3s part of 3s2p) to get 3 x 3.7V = 11.1V. Which Battery Is Best For Me?: To select a battery, you first need to know what voltage you require and how much current you will be drawing continuously. If you have a motor that works with 11.1V, you would need a 3 cell battery. If you need to draw 20A, and you would like to have a 10 minute (1/6th of an hour = 6C) flight, you would need a battery with 20A / 6 = 3.3A = 3300mAh. This means you would need a 3s 3300mAh battery with a C rating of 6 or higher. Safety Precautions: Never charge a lithium battery if it is below 3.0V per cell, puffed up, or damaged. Always place on a fire-proof surface when charging. Only use chargers designed to work with Lithium Polymer batteries. Never leave your battery unattended while charging.

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SAKURA D3 READY KIT WITH C.S

Weight Distribution True Front Motor design – using a triple belt drive system this allows the motor to be positioned in front of the front differential and in the centerline of the chassis giving it the forward weight bias needed in contemporary high powered RC drift cars. The belt drive system gives it the advantages of smooth and stable power delivery when compared to shaft drive cars which tends to be affected by motor torque action under acceleration

Steering The front arms of the Sakura D3 has been completely redesigned and is unlike anything else currently available. The steering lock angle will be by far the largest available allowing for maximum counter steer actions and higher corner entry speeds. The caster angle on the C Hubs will feature a massive 10 degrees adding more aggressive steering on high speed entries and more closely resembling real life FR drift cars.

Drivetrain Utilizing a belt drive system, overdriving the front or rear wheels can easily be done by changing the size of the belt pulleys , the 3 Racing Drift Car will come standard with a front wheel drive ratio of 38/13 (2.92) and overdrived rear wheel drive ratio of 30/22 (1.36). The triple belt system allows for flexibility of the positioning of the spur gear shaft allowing it to accommodate a wide variety of spur gear sizes up to a 64P 118T when used with a 40T pinion gears. Front and rear solid axles will come standard for the easiest of drift action control with the option of ball and one way differentials available as optional parts.

Suspension Suspension components have been completely redesigned to accommodate the largest chamber angle possible with the front and rear both allowing up to 10 degrees chamber whenever you need more side grip and also ensuring those large offset blind wheels stay within the side panels.

Oil Filled Coil Spring Shocks Lengthen 54mm coiled spring oil filled shocks with threaded shock bodies allows a more progressive chassis roll action and easy tuning."

Wide Angle Driveshafts The universal driveshafts of the Sakura D3 has been given a redesign to minimize chattering vibrations of the front inside wheel when using a front solid axleand steering is near maximum lock, which is crucial to maintain the front inside wheel will stay on the ground and provide a more consistent drift action.

Molded Rear Diffuser For an added touch of realism, a molded composite rear diffuser comes standard to give the Sakura D3 the extra attention to detail.

80T 48P Spur A 80 tooth 48 pitch spur gear will come standard with the Sakura D3 kit.

-3 Degrees Rear Toe-In Rear toe-in is adjustable via the change of suspension mounts, the Sakura D3 kit will come standard with -3 degrees rear toe-in mount.

Composite Molded Chassis The Sakura D3 will be outfitted with a FRP upper chassis and a molded composite main chassis featuring a motor cooling air inlet and designed with the rigidity to ensure efficient side to side weight transfer to easily initiate high speed drifting.

Yokomo Drift Machine

CS'd Yokomo MR4TC BD

CS'd Yokomo MR4TC BD

Tamiya TA06 PRO Chassis Kit - TA06 (PRO VERSION)

Specs and Features Oil filled Dampers 4WD, independent double wishbone suspension system Re-buildable Universal Drive Shafts (Pro Kit only) Low-Friction Drive Belts (174mm, 453mm) Aluminum Motor Plate Full Ball Bearings Aluminum Turnbuckle Shafts (Blue) included in Pro kit only Aluminum Ball Connectors (Blue) included in Pro kit only Hi-Torque Servo Saver (Black) included in Pro kit only The motor is installed at the mid-rear position which helps improve traction for the rear wheels. Comes equipped with aluminum motor plate and aluminum spur gear holder from the TA-05 chassis platform. Compatible with TA05 and TA06 touring car and sports car body sets Suspension parts from the previous TA-05 platform are used on the new TA-06. (short reversible suspension, steering blocks, castor blocks and optional aluminum suspension mounts) are all transferable Molded plastic parts are made of durable FRP (Fiberglass Reinforced Plastic) Chassis battery compartment is compatible with NiCd, NiMh, LiFe and LiPo battery technologies. The battery pack can be accessed from the underside of the chassis by removing the battery cover. Two front suspension configurations: IFS (Inboard Front Suspension using rocker arms) and Standard outboard suspension is possible with the kit-included damper stay parts. Body, wheels, tires, motor, battery/charger and R/C radio gear/ESC (electronic speed Control) sold separately and required to complete the kit Needed to Complete:

Tokyo Street Drifting RTC Style

Source : http://www.speedhunters.com