If you can't beat them, join them, was the motto when we ordered our Trex 600 EFL with a Mikado Vbar unit. We still firmly believe that large electrics are a pain, however we have to concede that the 600 EFL is turning out to be a lot more fun than we anticipated! The build was extremely simple in typical Align fashion. We used the stock equipment from Align (610 and 650 servos, Align BEC and Castle Creations ICE 2 ESC) with no issues so far. There are plenty of nice details, like the sliding battery tray mechanism and the servo placement. Using two, admittedly heavy, Hacker 6s 3800 mah lipos, this heli weighed in at a pretty hefty 4,4 kg ready to fly. When it comes to flying, the secret to having fun with this kind of helicopter is to set the flybarless settings to insane and to use the available power, which is a lot, for all kinds of crazy maneuvers. You can of course just fly it around in circuits since it tracks perfectly due to the relatively high weight, but the real fun begins when you go to a 100% flat throttle curve (about 2400 main rotor rpm) and slap it, smack it, bang it and abuse it as much as you can. In conclusion, still heavy, still a pain to charge those big lipos, but a lot of fun nonetheless.
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Installing the new DFC head on both the Trex 450 and the Trex 700 was very straightforward. What's also very nice is the fact that the overall pitch and cyclic geometry isn't modified, because the shorter main shaft makes up for the length of the driver arms, meaning that you just have to check 0 pitch with no other changes necessary in your flybarless controller setup. After a weekend of flights, we were quite happy with DFC heads. The perceived changes in flight characteristics are quite subtle, the heli seems faster and a bit crisper during rolls. We didn't boom strike the 700 even during severe bogging with almost 15 degrees of pitch, so that doesn't seem to be an issue anymore. All in all a very nice upgrade with a big cool factor.