The
original successor to Lichann's T-Rex. A most popular choice for the novice
and advanced pilots. After more than one year in production it is still the
best value and performer in its class. The ARK X-400 is the lowest maintenance
cost helicopter in its class.
View showing lower main shaft and main 138T gear with auto rotation bearing and secondary drive transfer gear. The rigid aluminium airframe provides a near damage proof solution to replacement.
 | Adjustable pitch system |
| High efficiency wooden main rotor blade |
| Auto rotation system |
| Black anodised CNC aluminium alloy side frames |
| High efficiency tail rotor |
| High rigidity CNC aluminium tail boom |
| High strength carbon fibre tail boom brace |
| Length: 630 mm. |
| Height: 225 mm. |
| Main rotor: 588 mm. |
| Weight: 300 g. (bare weight)/ 580-620 g. (with power components) |
| Gear drive ratio: 1:9.85:5 |
Please observe, the battery as shown provides the best position and approximate dimensions for optimum longitudinal balance. The motor is standard ARK-125 and ARK 122 ESC which provides much power giving performance as shown in the video. The modified position of ESC is either on top or underneath the battery (x). The gyro is now placed in the new gyro position (y). The micro receiver will now be positioned in position (z)
No slop fits ie. very close tolerances within the linkages provide the X-400 with unparalleled accuracy of control.
Ensure all linkages are to dimensions as shown on page 16 of the official manual.
In the event of stiff rod end fit squeeze the large exterior diameter gently to give a smooth operating link.