TMoore
rrProfessor
Location: Cookeville, TN
| For those of you that are trying to figure out how to set pitch and throttle curves with an ESC here is something that you may find useful.
It's really straightforward. Make your base line pitch curves go from -10 to +10 with ZERO pitch at half or 50% stick position. You may actually have to make a little top and bottom adjustment but this is a good place to start. If you use a 5 point radio set the pitch points at their nominal values of 0, 25, 50, 75, 100. If you are using a JR 9303 you will have to fudge the two extra points to approximate the 5 point values. At this point you should have -10 to +10 as the bottom and top pitch settings. In the normal mode set the 50 and 75 points to hold a nominal rotor speed. I make this whatever I feel comfortable with. On a Rex I fly in normal mode at around 2300 rpm. In the flight mode (FM) or idle up, set stick positions as follows:
Stick Pos. Value
0 100
25 75
50 70
75 75
100 100
This sets up a shallow V shaped throttle curve and the 25 and 75 stick positions will allow you to set the inverted and upright rpm settings. The 50 stick position can be adjusted to prevent overspeed. Some ESC's will just let you flat line the throttle curves between 25 and 75 so keep that in mind.
Go out and fly the heli. When you flip in to FM1 fly the heli to adust the rpm (75 stick position) to maintain a high enough headspeed to keep the motor in the powerband. On a Rex this is 2700-3000 rpm. To get 3000 rpm on a Rex you might be at 100% flat lined on the throttle settings. Once this is done, flip the heli to inverted and if you have everything working in your favor the rpm and the inverted stick position should be the same or close on the back side versus the front side. IOW, the upright hover and climbout should be mirred on the back side as well so that when you fly inverted it is mirrored from 0 pitch down to -10.
I then do inverted and upright climbouts and adjust the bottom and top pitch so that the rotor speed doesn't decay too much. I usually run just a touch more pitch than the machine can handle but I don't use it all. On the CC you can use the Helicopter fixed endpoint setting for this approach.
If you have seen some of the pros fly electrics or nitros and are wondering how they get some of the moves that they do, there are subtle things that they do in the radio to help them out. One of these tricks is the S curve trick on pitch. If you do inverted and upright hover in FM1 or Idle up at the 25 and 75 stick positions, on let's say a 9C that uses full stick motion on the throttle/collective stick, it's a long way to go from upright to inverted on the stick travelwise. By moving the upright and inverted pitch points a little closer together, it is quicker to make vector changes in motion with less stick movement from upright to inverted. On the Stylus I just move the 25% and 75% point to 30 and 70 respectively and this shortens the distance that the throttle collective stick has to travel from upright to inverted. This doesn't help with stick resolution just with the apparent speed that you can shift from upright to inverted. The maneuvers that this will help you with are snakes, piroflips and any other maneuvers where you are having to rapidly move the T/C stick to change from upright to inverted.
TM |
i just downloaded 1.51 and i just want to go fly my rex but i dont think its going to happen? i want to just plug the damn thing in and give it some throttle and then idle up and fly...why is this so complicated?? i dont have a tach i just use to set my idle up for 100,90,85,90,100 and rip it up!
