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Swash leveling (DX7 ?) - 11/25/2007 12:45:35 AM   
zaboaa


 

Posts: 191
Joined: 8/26/2007
From: Rockwall, TX, USA
Status: offline 		OK. Uses a swash leveling tool (trueblood?). Use the Finless videos for my set-up. Here is my delema. I'm a newbie so I level the swash to -1 and +10 in the normal mode. The swash is perfect. If I go to ST 1 the swash is level at mid stick, but at full negative and full positive, the pitch servo is raised (up) a good distance (I think it doesn't have evough range of motion), = the swash is no longer level. I probably won't use ST 1 or 2 anytime soon, but for the life of me I cannot figure out why the difference between Norm and the ST modes. I use the DX7 set up in the finless videos. Although I have toned down the throws a little. To fine tune the swash in the full throttle Norm mode I adjusted the Aileron and Pitch ranges on the DX 7, If I try this in ST 1 or 2 it goes back and messes up the NORM swash (read not level anymore). Is there a way to adjust the swash in ST 1 or 2 and not effect NORM? Any other suggestions help/ appreciated. Also if I need to post my DX7 settings I can do that too. I hope I make some sense, I am very new to this. thanx Mark

< Message edited by zaboaa -- 11/25/2007 7:19:43 AM >
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RE: Swash leveling (DX7 ?) - 11/25/2007 1:39:39 PM   
BarracudaHockey



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From: Orange Park, FL, USA
Status: offline 		Alter the end points on the effected servo

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RE: Swash leveling (DX7 ?) - 11/25/2007 1:50:24 PM   
hennesseylord


 

Posts: 485
Joined: 9/27/2007
From: Mulberry, FL, USA
Status: offline 		the servo that is making it not level, go into the dx7 menu and find travel adjust, try lowering the % on that servo and see if that helps. if i read your post right, it sounds like the same issue i had when i was installing my dx7/ar6100 on my V2. the rear servo was pushing up way to fast making the heli go forward when you increased throttle and go backwards when you go negitive pitch....i had to adjust that servo all the way down to 65% travel i think it was. hope this helps.


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RE: Swash leveling (DX7 ?) - 11/25/2007 8:26:59 PM   
zaboaa


 

Posts: 191
Joined: 8/26/2007
From: Rockwall, TX, USA
Status: offline 		The problem is the servo is good in NORM, but for some reason in ST 1 or 2 (on the high and low ends) it is about 5 degrees on the high side. Let me try to explain it better. Using the swash leveler all 3 points touch through the full range in NORM mode. In ST 1 and 2, at mid stick all 3 points touch, but at full aft and full fwd cyclic (left stick) the pitch side touches the leveler, the elevator and aileron have an equal gap ( about the size of a small BB). If I adjust the range in ST 1 or 2 I think it will through off my balance in the NORM mode won't it? Is there any other way to adjust just the pitch servo in the ST 1 or 2 mode? Appreciate the help...

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RE: Swash leveling (DX7 ?) - 11/25/2007 8:33:44 PM   
zaboaa


 

Posts: 191
Joined: 8/26/2007
From: Rockwall, TX, USA
Status: offline 		Another ? When you use the balancer (for that matter in the Finless videos also) should you level the squash in Norm or a stunt mode. In the video he starts at the mid stick posit, so I assume that is zero pitch, so he seem to be leveling the swash in a stunt mode. Is that correct?

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RE: Swash leveling (DX7 ?) - 12/5/2007 2:58:19 AM   
n3m3515


 

Posts: 31
Joined: 8/9/2007
From: , FL, USA
Status: offline 		Zabooa, does your radio have a hover pitch trim?? May old JR x347 has 2 knobs, hover pitch and hover throttle trim.
Both are ONLY active in normal mode. I am unfamiliar with the DX7, but didn't see any knobs in pictures of it.
Is there a setting on the screen menus for this??

N3M3515

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RE: Swash leveling (DX7 ?) - 12/5/2007 3:48:49 AM   
Druss


 

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From: Edmonton, AB, CANADA
Status: offline 		no the dx7 does not use knobs for those functions, it's a full computer radio so it uses menus on the lcd screen and lets you adjust a lot more. hov pitch and pitch trim which are typically seen on RTF 6ch heli radios now adays.

zaboaa, I typically set up my heli in stunt (idle up) mode to ensure that at mid stick I have 0 pitch, but in normal mode I usually have 3-4 deg pitch at mid stick.

< Message edited by Druss -- 12/5/2007 3:50:07 AM >

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RE: Swash leveling (DX7 ?) - 12/5/2007 5:47:20 AM   
zaboaa


 

Posts: 191
Joined: 8/26/2007
From: Rockwall, TX, USA
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Seems a lot of people have zero pitch at mid stick in all modes. Why do you use 3-4 degrees? I haven't messed with idle up yet but I'm worried about a big pitch change (read TREX shots straight up to the moon) when I select it.

Mark


quote:

ORIGINAL: Druss

no the dx7 does not use knobs for those functions, it's a full computer radio so it uses menus on the lcd screen and lets you adjust a lot more. hov pitch and pitch trim which are typically seen on RTF 6ch heli radios now adays.

zaboaa, I typically set up my heli in stunt (idle up) mode to ensure that at mid stick I have 0 pitch, but in normal mode I usually have 3-4 deg pitch at mid stick.

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RE: Swash leveling (DX7 ?) - 12/5/2007 4:35:28 PM   
soop7667



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From: Cape Coral, FL, USA
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quote:

no the dx7 does not use knobs for those functions, it's a full computer radio so it uses menus on the lcd screen


The DX7 DOES have Hover Throttle and Pitch Trims, in Normal Mode only...not to say that that's the problem, but they're located at the top of the radio in the form of rocker switches.

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RE: Swash leveling (DX7 ?) - 12/5/2007 8:12:01 PM   
BryFlyGuy67



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From: Grand Rapids, MI, USA
Status: offline 		...and I still don't understand what they are really for. How is this different than, say, using the throttle trim next to the stick?

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RE: Swash leveling (DX7 ?) - 12/5/2007 8:20:51 PM   
gnd2


 

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From: San Diego, CA, USA
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quote:

ORIGINAL: BryFlyGuy67

...and I still don't understand what they are really for. How is this different than, say, using the throttle trim next to the stick?

The throttle trim next to the stick is going to affect both the throttle and collective pitch together. The hover trims affect throttle and pitch individually.

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RE: Swash leveling (DX7 ?) - 12/5/2007 8:28:04 PM   
gnd2


 

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quote:

ORIGINAL: zaboaa

Another ? When you use the balancer (for that matter in the Finless videos also) should you level the squash in Norm or a stunt mode. In the video he starts at the mid stick posit, so I assume that is zero pitch, so he seem to be leveling the swash in a stunt mode. Is that correct?

If I recall correctly, Finless sets up normal mode so that it is zero pitch at mid stick and -2 degrees at 0 stick. Basically above mid stick the normal pitch curve is the same as idle up, they're only different below mid stick. It kinda looks like this __/ but the horizontal line isn't quite horizontal.

Other people just have a straight line in normal mode from -2 degrees to +6 degrees (or whatever their max pitch is). This provides a little positive pitch at mid stick and results in a much "gentler" hover, while the curve used by Finless gives a snappier response similar to idle up but without the ability to go inverted.

Either type of curve is ok and a matter of preference. But when you're in idle up, you definitely want mid-stick to be 0 degrees pitch. If you're doing the straight line in normal mode then you should set the swash level in idle up at mid stick. Then in normal mode you just set your end points to whatever pitches you want and then let the mid-point fall wherever it needs to be for a straight line. If you're doing the __/ pitch curve like finless, you can set the swash plate level at mid-stick in either normal or idle up mode since both modes will have the center point of the pitch curve (mid-stick) at 0 degrees.

< Message edited by gnd2 -- 12/5/2007 8:35:10 PM >

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RE: Swash leveling (DX7 ?) - 12/5/2007 8:48:22 PM   
BryFlyGuy67



Posts: 1578
Joined: 8/27/2007
From: Grand Rapids, MI, USA
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quote:

ORIGINAL: gnd2


quote:

ORIGINAL: BryFlyGuy67

...and I still don't understand what they are really for. How is this different than, say, using the throttle trim next to the stick?

The throttle trim next to the stick is going to affect both the throttle and collective pitch together. The hover trims affect throttle and pitch individually.

I see. And if I make small up or down adjustments to these hover and pitch sliders, is this a permanent effect to either thr throttle or pitch curve, or does the effect only last as long as you have your radio on?

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