The 6-channel DX6i uses the same full-range DSM2™ technology found in
the Spektrum DX7 and includes an impressive list of programming features for helicopters that are simple to access and use. The DX6i is also compatible with all existing Spektrum aircraft receivers. Whatever kind of flying you do, the DX6i can be used for any existing Helicopter that requires 6-channels or less. This is perfect for the Trex 450 RC Helicopter and about half the price of a DX7. Special Features Governor Mode Cont/Max Amp 15/20A Cells NiMH/NiCD 6-10 cells Cells Li-poly 2-3 cells Type/Max BEC (A) Linear/3A Max #Servos/V 2-4/6V Dimensions 42mm x 24mm x 9.3mm 3 X Main Servo -Digital -HITEC HS-5065MG <SPAN style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: #51515
(WxLxH), the AR6100E is the ultimate 2.4GHz receiver for most any small electric model from mini profile foamies to 400 class helis. Because it uses advanced DSM2™ technology, it is only compatible with DSM2 aircraft radio and module systems. It also boasts a wide input range that allows it to operate with 3.5- to 9.6-volt electrical systems. The range would be further than you would ever fly safely.
from Futaba. This is a High Performance, Compact and Lightweight (AVCS) Angular Vector Control System gyro developed for model helicopters. Because the sensor and control circuit are integrated, it is simple to install. This is spot on the money, as close to plug and play as you will get. This is now seen as an "older" type of Gyro although still readily available. It is a simple and robust winner and will be around for some time.
The outrunner high efficiency blushless motor 
was invented for T-Rex 250. Not only the superior torque and the explosive force, the 250 motor armature had a special balance adjust to improve the serious shaking problem that other tiny motors have. Maintenance free, high torque, high efficiency, stable and quiet. Japanese made high-speed ball bearings, powerful magnetic outrunner rotor.
Max continuous current:13A/16A(30sec)
Max output power:Approx. 140W/170W(30sec)
KV value:3400KV
Dimension:spindle 2.5x24.8x22mm
Weight:Approx. 30g
controllers is an excellent choice for small helicopters. You can use them with virtually any brushless out-runner or in-runner motor.
Small and compact PCB design for ease of installation
Large heat-sink for great thermal performance
Ultra smooth motor start design to run with all kinds of brushless motors
This is the S3153 Digital High Speed Micro 
Mini Servo, Designed for use with Futaba Radio Control Systems. This Servo is the Digital High Speed version of the S3103 Servo. This is more than enough for the Trex 450, small but punchy.
Speed: .11 sec/60° @ 4.8V .09 sec/60° @ 6V
This is the Hitec HS-5065MG Mighty Feather 
Metal Gear Micro Digital Servo with Universal Futaba J, Hitec S, JR and Airtronics Z Connector. Best choise, robust and accurate.
Very simple to use, the Astro 'Blinky' is 
PACKED with features to allow SAFE: balancing, charging, and discharging of each cell within your Lithium pack, also use to check voltages of each cell. Use the Astro 'Blinky' to check for low voltages in your pack, checks each cell. Can be used to balance pack while charging (use with any dedicated Lithium Charger). Can also be used to balance the pack after charging to ensure correct voltage of EACH cell within the pack!
Charges, Discharges and Cycles NiCd, NiMH and Lithium-based 
battery packs. Perfect for radio batteries, Lithium Park Flyer batteries, plus single cell glow starter cells.
