jtg13
Heliman
Location: So Cal
| Michael,
I setup this gyro on another TRex 500 (with a DX7 radio) today and it was awesome. Here is what we did, depending on your radio you may have some differences.
1)Used Gear travel adjust instead of gyro (personal preference but gyro works fine too). Final travel adjust was 21 (this would equate to about 62% if you use the gyro feature..same thing though)
2)Set rudder channel travel adjust to 100/100. I know the instructions say use 150/150, and that will work fine, but you will use a lower dual rate number to get the desired piro rate if you do. Peraonal preference, use whatever you like.
3)set rudder dual rate to 88% (lower if you used 150/150 travel adjust). I like a piro rate of around 900deg/sec which is 2 1/2 piro per sec... adjust to your taste.
4)set rudder expo to 60%. THIS IS IMPORTANT. As in the instructions, 40% expo is actually linear. This is equivalent to 0% expo on other gyros. At 40% expo the tail will stop like a rock and is generally way to hard a stop for most people. If you use 0% expo you can easily strip belt teeth or crown gears in torque tube drives since you are in essence running negative expo. I find 50% to 60% will give a firm but smooth stop with this gyro. Once again personal preference will dictate this number. Try 60% expo and work from there for a safe starting point for setup. I have found less than 50% expo will give a bit of a bounce on hard stops, and less than 40% will give severe stops and bounce.
5)adjust the end stops with the pot on the gyro
6)put the bird in a hover in rate mode and adjust your linkage or slide your tail servo mount on the boom until you have no left/right drift in a hover at the headspeed you will be flying at. This means you are NOT using a linear throttle curve in normal mode for an electric heli like the TRex 500. It will be more like 0,85,90,95,100 or however you like your normal mode throttle curve... or use governor mode if you prefer that. The important thing is to have your headspeed at the desired flying speed in a hover to mechanically set the rudder linkage. If you set the linkage at a low headspeed it will probably not be no drift at the flying headspeed because of the change in torque at higher headspeed and the efficiency of the tail blades at a higher headspeed. This is important.
7)re-adjust the end stops with the pot on the gyro since you have probably changed the neutral position in step 6 and you don't want to bind your linkage.
8)if you are using Spekrum or JR 2.4GHz radios re-bind to store the new rudder neutral point
9)go fly and fine tune the gain, expo, and piro rate (use rudder dual rate for piro rate) to your taste
Hopefully this will get you on the right track and let you enjoy this awesome gyro. Hope this makes sense. |
