Say goodbye to tail kicks and blowouts on your T-REX 470L. With a larger 67T front tail pulley and a longer belt, this upgrade increases your tail ratio from 3.7:1 to a much more reasonable 4.5:1, greatly increasing your tail power and authority. It’s easy to install and will greatly improve your flying experience, especially at lower RPMs.
This setup is best suited to 69-71mm tail blades, and running larger tail blades than that is not recommended.
Included in the kit:
1 x 3D Printed 67T Pulley (Carbon Fiber Nylon Plastic)
1 x Extended Belt
4 x M2 Washer
Be sure to go through tail setup again to ensure proper endpoints for the tail servo after installing this upgrade.
The included M2 washers are optional. They are only needed if you have issues with the pulley touching/rubbing on the main gear. Whether or not you need them varies on a case by case basis. We suspect there might be different versions of the ALIGN main gear hub resulting in slight changes in clearance.
1. Remove the main gear/pulley and tail boom assemblies from your helicopter. The standard ALIGN manual can be used for this process.
2. Install the 3D Printed pulley in place of the original. The flat side of the pulley goes upwards when installed in the helicopter.
3. Fully loosen the belt tensioners. To do this, screw the tensioning screws all the way in.
4. Replace the stock belt with the longer one included with this upgrade, then reinsert the boom The standard ALIGN manual can again be used for this process.
5. Once the helicopter is reassembled, pull hard on the tail boom while tightening the boom clamp screws.
6. If necessary, further increase belt tension by loosening the tensioner screws a little at a time. Because of the extra load on the tail rotor and ALIGN’s unfortunate choice of using MXL belts on this helicopter, tension must be quite high to prevent slipping.
7. Go through the tail setup on your flybarless unit to ensure proper tail servo endpoints.
If you want a spare/replacement belt or pulley, please contact us directly.