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T-Rex 450
Second smallest (after new 250) heli in Align range. The first incarnation of the T-Rex 450 was the 450X, which was comprised mainly of plastic and was available with an "HDE" (mechanically mixed) rotor head. The T-Rex 450X was upgraded to a version 2 (V2) which was largely identical to the original model but included some additional bearings and repackaging. Align released a series of blue anodized aluminum upgrade parts for the V2 and these were the basis for the later (and evolved) SE model - see below. The 450XL model, nearly identical to the 450X mechanically, was equipped with a longer tail boom which would eventually become the standard for future T-Rex 450 models. It also came in two versions, one with HDE (with mechanical mixing) and one with CDE (CCPM-mixing) rotor head. Another difference with the XL models was an apparent change in the plastics used for the frame and mechanical parts - the mixing levers and flybar mechanism. These were now released in a black plastic (rather than the grey plastic used in the initial models) and were apparently more robust and (possibly) more precisely constructed, resulting in better crash resilience and less 'slop' in the control structures. 'Slop' is a term used to describe freedom of play in the levers and control systems of a model helicopter which result in it being difficult or unpredictable to fly. Align later released their flagship model, the 450SE. Based on the Trex XL, the SE was equipped with a carbon fiber frame, along with many blue-anodized aluminum upgrade parts. It also featured direct servo-to-swash CCPM-mixing, eliminating much of the play (slop) from the bellcranks in the older versions. The "kit" comes about 80% assembled. During the life of the SE there were several incremental changes that lead to problems as some people (including dealers) were calling the upgraded kits V2, then Align came out with an official V2. So the updated SE kits were called V1.5 kits. Some of the changes over the SE lifespan included the tail hub, tail pitch pushrod, washout block, seesaw, main and tail drive gears. Later kits came with the 430L (3550 Kv) motor and the 35G, 35 amp electronic speed control. Earlier models came with the 420L and a 25 amp electronic speed control. Align followed with the 450SA model, an ARF (Almost Ready to Fly) version; this model was a cheaper version using the same layout with as the SE, but with aluminum frames and the most of the CNC aluminum parts are replaced by plastic. This model is only sold in North America and is distributed by Horizon Hobby. Align eventually produced the Trex 450S, which is a kit (semi assembled like the SE) based on the SA that was available worldwide. The S was available with an aluminum or carbon fiber frame. Align made a official V2 (Version 2) of the SE featuring several notable improvements. The new frame mounts the gyro underneath the tail boom for added protection, and includes a new, more powerful motor(430XL) and an improved electronic speed control. Additionally, the V2 features several updated parts including the rotor head, tail assembly, and servo mount. They added thrust bearings to the main grips and increased the spindle shaft to 4mm thick. The anodizing is a deeper blue, and the frames are modified. Also came with the 430XL (3700 Kv) higher output motor and the 35X, 35 amp ESC that supplies 6 volts to the electronics. The lastest version is the 450S GF version, which is an S with fiber glass frames instead of carbon fiber or aluminum. The electronics included with the T-Rex kits have also evolved alongside the mechanical characteristics of the model. The initial 400S (short can) and 400L motors have been replaced by increasingly powerful and more efficient motors including the 420L series (XL and early SE), the 430L series (SE models), and the 430 XL (SE V2). Electronic Speed Controllers (ESCs) - the electronic throttle for an electric motor - were also introduced and have evolved thru models that were rated at 25 Amps and 35Amps. Additional functionality such as governor functionality were added to later ESCs. Align started to offer marketing bundles including motors and ESCs with later T-Rex models. The Trex is a "park sized" helicopter that is suitable for flying in baseball fields, soccer, field and other parks. It uses fairly inexpensive 3S 2100 battery packs ($50 - $80 per battery pack). Trex Models: 450X - Original Trex model with grey (soft) plastic frames and short boom. Used mechanical mixing for cyclic and collective. 315mm blades only. 450XL HDE - Upgraded X with longer boom to support 325mm and 335mm blades. Changed plastic to black, better plstic. 450XL CDE - Same as XL HDE but used electronic CCPM mixing for cyclic and collective control. Servos still actuated the swash via bell cranks. 450SE - Major change to direct servo to swash eCCPM mixing. Carbon fiber frames, CNC aluminum for the head parts, tail case, bearing blocks. 450SA - ARF (95% assembled) version specific to Horizon Hobby. Fully assembled, with frames based on SE layout, but made of aluminum. Head parts, tail parts, and bearing blocks were plastic like the XL. 450S - kit version of the SA with choice of carbon fiber or aluminum frames. Plastic head, tail and other parts. And now as the GF version with fiber glass frames. 450SE V2 - the official V2. Changed the SE blue anodizing to a deeper, darker blue. Updated the rotor head to take a 4mm spindle shaft and thrust bearings in the main grips. Changed the frame layout to change the battery tray angle and to mount the gyro under the boom block. The tail servo mount was changed to fit the mini servos that most peope are using versus the older versions assuming micro servos.
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flying my TRex 450 SE V2 in Middelburg
