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Old Dec 02, 2012, 11:22 PM
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Hitec Aurora 9 Motor control question

I have an A9 that I've recently put into an XL3200.

I have butterfly/crow activated, and functional on the throttle stick, but I need to find a way to disable the throttle via a switch to make the crow feature fully proportional.

I know that I can set up the throttle as an on/off control on a switch, and that I can use the "motor" feature to have the throttle slowly ramp up to full throttle on a switch, but neither of these are what I want.

What I want is fully proportional throttle available controlled by the throttle stick with a switch that will drop the throttle completely to zero, regardless of the stick position. This would allow me to then activate crow and use the throttle stick as a fully proportional control of the crow for precision landings.

Any ideas on how to do that?

Thanks for your input!

-- Mark
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Old Dec 03, 2012, 09:19 AM
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Mark,

This may help but, as always, dependent on your preferences:

I have most of my sailplanes set up for spoilerons so I like fully proportional control on them as well. I fly with an A9. I kept my throttle on the left stick and assigned my left slider to handle the spoilerons. Gives me proportional control on both.

Dave
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Old Dec 03, 2012, 10:53 AM
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Originally Posted by Highride View Post
Mark,

This may help but, as always, dependent on your preferences:

I have most of my sailplanes set up for spoilerons so I like fully proportional control on them as well. I fly with an A9. I kept my throttle on the left stick and assigned my left slider to handle the spoilerons. Gives me proportional control on both.

Dave
Dave, I've done that before, and found it somewhat useful. However, for me, I find it to be much more precise if I have the spoilers/flaps/crow on the throttle stick, allowing me to make instantaneous adjustments, while still maintaining attitude control through ailerons, rudder, and elevator.

Thank you for your input though!

-- Mark
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Old Dec 03, 2012, 11:32 AM
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Problem solved:

A phone call into Hitec's support center, and a chat with a great guy named Mike has resolved my question.

Under the sailplane menu, there is a throttle lock feature. I had activated this and played with it, but couldn't make it work. Mike and I were a little puzzled on this, until he mentioned that I had to be transmitting in order for the function to be active.

A quick change to transmit allowed for a quick check of the throttle lock function -- and all is good.

So I can use the throttle as a proportional control, managed by the stick, and after climbing to altitude, return the stick to full idle, and activate the throttle lock.

After that I can then activate crow and use the throttle stick as a fully proportional control over the flaps and ailerons.

True, the throttle lock feature isn't as simple or fool-proof as an idle-down switch, but it will work for me.

Yea!!
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Old Dec 03, 2012, 02:24 PM
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Guess I'd better put that in my notebook! Third season on my A9 and always learning some new approach.
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Old Dec 03, 2012, 02:52 PM
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Just two awkward things arise though with that approach:

1. If you have stick "up" for no crow / braking, and "down" for maximum braking, then you will have to move the stick from one extreme to the other after you lock the throttle...

2. Flowing out from the above, it could get awkward if you decide you need suddenly to apply power to get out of a sticky land-out situation...

I didn't know about that slow throttle ramp-up feature: where do I find that?
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Old Dec 03, 2012, 11:20 PM
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Originally Posted by Woodstock 1 View Post
Just two awkward things arise though with that approach:

1. If you have stick "up" for no crow / braking, and "down" for maximum braking, then you will have to move the stick from one extreme to the other after you lock the throttle...

2. Flowing out from the above, it could get awkward if you decide you need suddenly to apply power to get out of a sticky land-out situation...

I didn't know about that slow throttle ramp-up feature: where do I find that?
regarding the two awkward things... Yeah, I know. It's crossed my mind a couple of times. On the other hand, I've found myself with a similar set of switch protocols in flying helis, especially in doing aerobatic autorotations -- one has to keep stick movements, and switch positions in mind all of the time. I would prefer something simpler and more fool-proof, but unless I go to the acro or heli menu, that's just not going to happen. (I haven't really looked at what it would take to reprogram crow in acro or heli, but I'm under the belief that the effort isn't worthwhile).

About the slow ramp-up feature --- if you have your sailplane programmed as having a motor then you should have a "motor" button in your sailplane programming menu. You can activate this and slave it to a switch that will transition the throttle from idle to full at your preselected rate.

If you need more details, let me know, and I'll take some pics of the menus on my tx.

-- Mark
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Old Dec 04, 2012, 07:38 AM
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Thanks fior that Mark, I'm very pleased to hear about such a feature as I find even the "soft start" function on most ESC's a bit harsh when using a switch as throttle. I'll have a look this evening !

Chris
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Old Dec 04, 2012, 10:49 AM
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Just remember...Throttle lock locks the throttle in what ever position the throttle stick is in when the lock is activated.

I had an experience where the throttle lock switch got bumped on while the throttle stick was not in down position, this was during a battery swap so the plane was off, but the radio was still on and transmitting. My plane had a separate arming switch for the motor, which is why I didn't know I was broadcasting a partial throttle position.
Lets just say that when I armed the motor all broke loose. Thank god no one was in front of the plane and that I still have all my fingers! The airplane suffered a lot of damage because it was flailing on the ground trying to spin the prop...smoked the esc too. It took me what felt like forever to figure out how to shut the plane down because I was so fixated trying to turn off the motor with the throttle stick.... Which of course was not even active!!

Now my motor is on the spring switch so it can't get left on, and I use the radios motor timer to delay motor start by half a second before my two second ramp-up to full power even begins. The motor delay timer starts to beep when you first trigger the switch, so there is warning that the prop is about to spin....
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Old Dec 04, 2012, 08:08 PM
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Nathan,

thanks for the advice.

The use of the throttle lock has identifiable concerns, and I've debated the pros and cons of reprogramming the entire setup in a mode other than sailplane.

At this point, I'm going to experiment with the throttle lock, as well as a few other options.

Is with any electric airplane, especially one with has much available power as this, I think it is critical to establish a routine for activating the throttle, both on launch and while in flight.

... and the more simple the routine, the less likely an error to occur.

Lots to think about on this!

-- Mark
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Old Dec 05, 2012, 02:38 AM
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Quote:
Originally Posted by buzzfly View Post
About the slow ramp-up feature --- if you have your sailplane programmed as having a motor then you should have a "motor" button in your sailplane programming menu. You can activate this and slave it to a switch that will transition the throttle from idle to full at your preselected rate.
-- Mark
Right on, I found that function, great ! I think I need to get the manual out in order to find out what the "speed" and "delay" mean...

Chris
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Old Dec 05, 2012, 06:11 AM
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Right on, I found that function, great ! I think I need to get the manual out in order to find out what the "speed" and "delay" mean...

Chris
Chris,

I have to admit that all I did was to scan the table of contents, but I didn't find any reference there to the motor function, nor to the throttle lock. I learned about it by activating it, assigning it to a switch, playing with the parameters, and then viewing the result on through the monitor feature.

If you find more complete descriptions in the manual, I'd like to read them!

-- Mark
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Old Dec 05, 2012, 07:40 AM
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Thanks Mark, I'll have to dig deeper - I may even have to haul the plane out of the garage and fire her up!

Chris
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Old Dec 05, 2012, 09:48 AM
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Its in the manual somewhere, but like most of whats in that booklet it really doesnt tell you a heck of a lot. so I'll give it a go....

The delay setting is basically a count down timer. When the motor switch is activated the delay timer starts. The radio will beep several times per second during the countdown and at the end of the delay time the motor will begin to turn.

The speed timer is the power ramp feature. The setting is used to delay reaching full power.

Function flows like this:
Motor switch ON....
delay timer starts ( beeping)
Delay ends
motor starts turning AND the speed timer starts.
The motor will reach full throttle position gradually based on the start timer setting.
(more time, slower application of power)
When the speed timer reaches zero the motor will be at full power.

Toggling the motor switch off will stop the motor, AND all timer functions reset themselves.

Keep in mind that while a long delay and ramp up time is nice for launch and flight line safety; the delay times must be reasonable for restarting the motor in flight. A two second delay is a heck of a long time to wait for a shot of power in an emergency situation.


hope that clarifies the function for you guys
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Old Dec 05, 2012, 10:03 AM
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Perfect! Thanks for that explanation!

Chris
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