Written by Ashley Davis Wednesday, 20 July 2005 00:00
initially let's take a look at the tail shaft :
As can be seen from the pictures above the tail shaft has an aluminium pulley, is made of titanium and is slightly longer than the stock shaft supplied with the T-Rex. The idea being that this extra shaft length will give you more throw on the tail rotor. The tail pulley is made of aluminium and should wear less than stock plastic part, it is also narrower than the stock part and so the belt will run more true. These improvement is are designed to allow the tail to run a higher speed with less problems than the stock unit. I'll investigate performance improvements later but for the moment here are some pictures of the shaft being installed into the MicroHeli CNC tail case.
Having installed the shaft the following pictures show the fitting of the MicroHeli tail pitch slider (SE) and the MicroHeli CNC tail rotor. Take careful note that the ball links are leading the blades, this is important if you are to get maximum throws from your new tail shaft.
The shaft installs just like the stock shaft and there are no different installation steps required. The ball links must lead the blades otherwise you lose the advantage of having a longer tail shaft. The reason for having a longer shaft is to get more throw for right rudder, if you have ball links trailing the blades then you can get no more throw than if you were using a stock tail shaft. This is because the pitch slider hits the tail rotor hub and can go no further. With ball links leading the blades the pitch slider moves towards the gearbox for right rudder and in fact you hit the limit of tail rotor travel before the pitch slider hits the gearbox. So the big question is whether this actually makes any difference?
Well the answer to this is a resounding yes! With this longer tail shaft, setup in this way, the machine has much more right rudder authority. A having watched the pulley run on my machine tethered, the belt does run very true with no left to right movement on the pulley. Based on this outcome and for those of you lacking in tail power and wanting to explore manoeuvres like backwards flight, I would recommend this upgrade.
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