Gaskurve für Flächenmodell

[FunFlyer]

Ich möchte einem Flächenmodell (Wasserflugzeug) eine Gaskuve zuordnen, damit ich in einer Flugphase eine Kurve erstellen kann, die nur von 0 bis +100%, in einer anderen Flugphase aber von -100 bis +100% geht. Wofür ich das brauche? um in dem Wasserflugzeug Regler einsetzen zu können, die die Motordrehrichtung ändern können. Beim Wassertaxi ist es manchmal notwendig zu bremsen, oder auch z.B. rückwarts aus der Uferbewachsung wieder ´rauszukommen. Bisher konnte ich Gaskurven nur bei Hubschraubervorlagen finden.

[FrankS]

First check you ESC, some aircraft ESCs have the function to reverse the propeller direction by a separate channel, so you don't change throttle curve but use a separate channel on a switch for forward and reverse.

However if you are using a car or boat ESC then the best way would be to create a new mixer, say called Throttle+ assigned to the ESC channel, with two (or more) mixer curves, each with throttle as the input, and make these swtichable either by a switch or flight phases, then adjust each mixer curve to give the desired action.

And yes a reversing ESC on a seaplane is very useful.

One other option, and I haven't tried this, would be to use the flight phase trim settings in the controls menu and just have a very high trim position in the 0 to +100% curve.

In all options you would have to be careful to ensure that throttle cut didn't start the motor in reverse if activated in the wrong throttle mode.

[FunFlyer]

Thanks for Your input, but I originally wanted to use ESCs with a seperate "reversing switch". I wanted to buy them from Hobbyking, but unfortunately they´re not available. You know any other source? I´m definitely not going to use car or boat ESCs.
Having said all that, I still have no solution for using trottle curves with a fixed wing setup on the PTX. Like I said in my original post, gas curves are only available for helicopters.

[FrankS]

If you drive the ESC via a mixer you can define 9 point curves in the mixer definition menu and switch between curves, I can do you an example if you like, but you will still have the issue with the throttle cut switch in that it will move the servo to -100%.

Also as far as I am aware, there are no aircraft ESCs available that allow you to use a throttle curve to get get reverse propeller rotation. Note when programming helicopters you actually program the throttle and pitch curves and the motor always turns in one direction but you can set the motor power so that at low stick you get high power for inverted flight when the pitch of the blades goes -ve.

I did try the trim option on my Profi and it works, if you set the trim steps to the maximum and then full up trim the ESC moves from 0 to +100%, if trim is at minimum it goes from -100 to +100% but this option would only work with a boat/car ESC

[FunFlyer]

I think I found a solution, Unfortunately I cannot upload any pictures to show You. So I´ll try it with words.

I created a mixer with three gas curves (cu1, cu2, cu3). They are activated exclusively via a threeway switch. The screen looks something like this:

Gas --> Curve 1 5> "up arrow"- (switch in upper position)
Gas --> Curve 2 5> "up arrow"- (switch in middle position)
Gas --> Curve 3 5> "down arrow"* (switch in lower position)

Gas curve 1 goes from 0 to +100
Gas curve 2 is 0 all the way across and acts like a "throttle cut", but with a value of 0 instead of -100
Gas curve 3 goes from -100 to +100

for the float planes with 2 engines I added a fourth line, which reads

Rudder --> 35% 5> "down arrow"*

that way, when I´m on the water and switch 5R is in the lower position, I can steer the plane with differential thrust. The second motor has a separate mixer, only difference beeing -35 instead of 35 on the "Rudder" line. Throwing switch 5 to the middle stops any motor rotation. Now I can move the throttle to lower position. Throwing switch 5 to upper position gives me full throttle range for flying.

looks good on the servo monitor, now I´ll have to give it a try for real, which I´ll do with one of my boats.

Thanks for Your hint regarding the curves in a mixer!!

[FrankS]

Looks good, just check it in the servo monitor to make sure it is doing what you want. I'll have to check but I think when you use a 3 position switch as a mixer switch then the switch will operate as ON,ON,OFF or ON,OFF,OFF in the 3 postions, I am pretty sure that you can't have it only on in the middle position. So in your description when the up arrow is shown, both curves 1 and 2 are active But please check and let us know.

If you use flight phases as the mixer switches, e.g. FP1,FP2 etc then you can use a 3 way switch to do this.

What I would do in your case, is make 4 flight phases and then the master phase (on a 2 way switch) would activate the curve with 0 all the way across, so acting like a throttle cut.

[FunFlyer]

I gave it a try on one of my boats. IT WORKS. So You can use a 3-way switch in a mixer.