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Newbies: Tips and Information Section of HF, specifically for Passing along info to newcomers to the hobby. Setup, tweaking, orientation practice, etc. |
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01-06-2014, 05:29 PM | #1 (permalink) |
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Join Date: Jan 2014
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How to set Pitch Curve - Doh
Ok, I might sound like a fool, but how do I stop my blades from spinning in order to check my Rotor Pitch. I own a flybarless Trex 450 v2 pro. On my old blade 450 I just use to disconnect 2 of the 3 wires to the motor. However on my new (well 2nd hand) Trex, these wires seem nigh on impossible to get to!
I (foolishly) thought that hitting Throttle off on my DX7s would solve the problem, but this obviously(!) changes the pitch massively (and any alts I make to the pitch curve don't seem to be having any effect. Many thanks for any help. |
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01-06-2014, 06:07 PM | #2 (permalink) |
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Join Date: Apr 2011
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How to set Pitch Curve - Doh
Throttle hold. Or you can unplug your motor.
If you are trying to check positive max and negative max pitch set your throttle hold pitch curve linear. 0-25-50-75-100 Most folks fly normal mode with minimal neg pitch due to mostly not flying inverted. You can check that by setting your hold pitch curve to the same as normal and checking the amount of neg pitch you get. Your throttle hold throttle curve should be all zeros unless you have done kind of auto bail out set. Sent from my iPhone using Tapatalk
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Heli's I have: Goblin 500 (Vbar Neo), Gaui X5(Vbar Neo), X7(Vbar Neo), Innova 600 Night heli (Vbar Neo Vbar Vcontrol I'm the not so newbheliusr as I have been here a while. But I like this name. |
01-07-2014, 05:14 AM | #3 (permalink) |
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Join Date: May 2012
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These are the steps I'd follow,
1) Decide on what you want your max. pitch to be, 10, 11, 12 degrees etc 2) Adjust the mechanical linkage (servo ball position, link lengths etc) to give you that figure at nought and 100% pitch (using a linear pitch curve) with the swash centred straight and level at midstick, moving square up and down. Once you have done that you can set the pitch curves for different flight modes using the settings in your transmitter and be reasonably confident you're near the values you need. Once full negative and full positive pitch are correct I've never personally felt the need to check the pitch again to see if I'm getting what I've programmed. |
01-07-2014, 05:53 AM | #4 (permalink) | |
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01-07-2014, 08:04 AM | #5 (permalink) |
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Join Date: Sep 2011
Location: Paradise Lost
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Take a good look at your THROTTLE Curves, there should be one for Hold. This curve should be a flat line at the zero mark (0,0,0,0,0). I all due respect, do you know where the TH switch is located, mapped to and how to activate and de-activate the throttle hold? If so, then:
Like others point out: set your hold throttle curve on flat zeros all across set your hold pitch curve linear DIAGONAL 0,25,50,75,100 You should be able to engage throttle hold and move the swash up and down without the motor spooling. Now you adjust your MECHANICAL pitch curve to whatever you want -12 at low, 0 mid stick, and +12 high stick or whatever you like. IMHO, anything over -13 to +13 can sometimes stress the motor/ESC too much (given I'm not much of a stick banger) Once you've done this you set the idle-up PITCH curve the same as the hold PITCH curve. You can then set the normal curves anywhere in between. But it is imperative that you set your mechanical correctly, later on you'll most likely have all pitch curves flat diagonal. BTW mechanical is what you do with the links and (hardware) to achieve the corresponding / desired pitch once the radio (software) has the previously mentioned values programmed into. Hope this helps.
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01-07-2014, 08:36 AM | #6 (permalink) |
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Join Date: Feb 2012
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When you select the "throttle curve" or "pitch curve" screens you will see 3 boxes with a letter in each one,
N = normal flight mode I = flight mode 1 H = throttle hold Scroll to to desired box and the display will show the curve. Select the one you want to change and then you can scroll to the 5 points and adjust. Use the "monitor" screen to verify the channels are acting as expected. It is good practice to have the heli in a way that: won't cause injury or damage if it spooled up on the bench, for example motor disengaged from main gear, OR no possibility of spool up, for example motor leads disconnected. I had the same heli and routed the motor leads for easy access to disconnect, in fact I set up all my helis this way. Brad G
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01-07-2014, 08:38 AM | #7 (permalink) | |
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01-07-2014, 09:58 AM | #8 (permalink) |
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Join Date: May 2012
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You need to take a look at and understand flight modes. You need one in which the throttle is zero whatever the collective position.
In my view, throttle hold mode (or throttle cut, same thing) does not give you sufficient protection to set up the heli on the bench. For non-whirly things taking the blades off is a good idea, for blade adjustments disconnecting the motor or using a separate 4xAA battery pack for the receiver and servos (not using the flight battery) is recommended. This doesn't necessarily mean it is foolish to check pitch in throttle cut, just more risky than one would like. |
01-08-2014, 07:58 AM | #9 (permalink) | |
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