Jermo's DX7 Setup Video

[bilbil]

You got the point bro. I agree with you but i'm doing this because of my curiosity of using the GEAR switch as the input to be in rate or HH mode :D . After trying this I'll maybe back using the gyro sens option for my heli. Thanks for replying BryMeister:noteworthy

[BryMeister]

I personally don't fly in rate mode, though some do. I use it only when setting up the tail servo position. To me, it is an easier solution for those of us who do not need to change our gains based on the position of the flight mode switch. I also don't have to worry about the 1:4 ratio when using the gyro sens menu.

I think that it is mostly personal preference and what makes the most sense to you as an individual. Certainly it has been proven that you do not necessarily need to setup in rate mode if you're flying in HH mode all of the time, but that's the way I like it.

As we all know with this hobby, there are always more than one way to go about doing something!

[crashgsxr]

hi bob thank u grate help would be lost without u

[Maxime30]

Maybe it's been covered before (don't want to read 31 pages), but with this 1.44 to 1 formula... does it means that the actual maximum gain, when using the gyro menu, is only 72%???


72% divided by 1.44= 50....


50+50= 100.... So I can't adjust my gyro to more than 72%??????????????


My G770 on a raptor is set at 65% gain.... However my 401 was at about 81% on the same helicopter before....

[Finless]

Your not doing the math right. each step ABOVE 50 is equal to 1.44
The equation for figuring out gain is
(X - 50) x 1.44

So if your gaiun value in the gyro menu is 72
(72-50) x 1.44 = 31.68 true gain in a futaba gyro

so whats the max gain? (100 - 50) X 1.44 = 72%
I can tell you NO heli will not wag with REAL 72% gain. 401 / 611 gyros usually run no more than about 40 REAL gain. Running a 611 over 37% usually will cause servo burn out.

Bob

[bilbil]

No. When using GEAR channel travel adjust to set gain, the ratio is 1:1. I have found that a gain of 60 is still a bit high on my TREX SE V2. I get a small bit of tail wag when doing rapid piros. I'm going to experiment with lowering it until the wag goes away as soon as I can get back out in the field - maybe tonight, winds permitting.

I got +30 gain (HH) on 401+HS81 combination if using GEAR travel adjust.No obvious tail hunting. If converted to gyro sens menu it will be 70.833 of gain. Thanks for sharing :thumbup:

[Vmo]

First off, a big thank you to all who have done the videos, the informational posts, and those who made this web site. Without all the information here I would still scratching my head wondering how to put my Trex together. Instead, I'm successfully flying but with an issue I hope someone can shed some light on.

Quick rundown: Trex 450 SE V2, DX7, AR6100, GY401.

I went through all the setup videos including the one on the DX7 and I think I missed something. To get right to the point, why does the upper right switch on top of my DX7 function as throttle hold AND turn the gyro on and off? I have the gear switch set to Gyro but that switch doesn't seem to do anything.

Thanks!

Kurt

[Jermo]

When you use Gyro Sense to control the gyro your flight mode switch (top LEFT switch) controls the Gyro. Throttle Hold is one of the flight modes monitored. It sounds like you have the Gyro Sense menu set for something other than intended. Go back to the video to the gyro sense menu setup and review your settings. :)

[Skarn]

Yep, what Jermo said....you have your TH gain setting at below 50% which puts it in rate mode.

Skarn

[Vmo]

Hmmmm... Ok, here's what I got:

On the [INPUT SELECT] screen I have: AUX2 GEAR
INH GYRO

In the [GYRO SENS] screen I have: AUTO F. MODE
NORM: 0
RATE: STNT: 0
0: 72% HOLD: 0
1: 30%
Is this rightly or wrongly?

Kurt

[Maxime30]

Your settings looks good. In the gyro menu, you have the option of assigning a particular rate to each flight mode, OR to control gyro rate with the rudd DR switch. Your setting seems to be correctly set to each flight mode.


Here are my (stupid) questions.... Do you have a Helicopter or Airplane version of the DX7? Both can do helicopters but switches are placed differently ( altough I don't see any switch in your setup that could turn off the gyro....)


Do you have the gain plug (one wire only) in the gear channel in the Rx??



You don't seem to be using the normal mode on your gyro... You could try to program both rates at 72%, instead of 72% and 30%, and see if it corrects the problem.....

[Vmo]

I have the airplane version and the gain wire is in the gear position (just re-verified that).

I did have both set to 72 but someone who's helping me get things going changed it to 72 and 30. Something about wanting HH mode in normal but not in Stunt 1 or 2 if I remember right. He turns off his HH mode after takeoff when he flies and then turns it back on prior to landing. Not sure if that's what his settings are doing for me or not. Still learning this stuff. :)

Kurt

[Maxime30]

Quite frankly I think it's better to have the gyro in HH in all mode... Normal, stunt and throttle hold. I believe that if you set 72% everywhere, you problems will go away.


And since you have the airplane version of the transmitter, the switch layout is different than what you saw in the DX7 video. So you'll have to make sure you find the right switches..... for example, possibly the Throttle Hold will not be the left upper switch, and the flight mode switch will be ( I think ) the 3-position flap switch. Switch confusion might be part of your problem.... Unfortunatelly I can't say which switch is which because I don't have an airplane Transmitter here....

[Skarn]

I agree with Maxime30...set everymode to 72% unless you are tweaking the gyro. Most never fly in anything other than HH mode. Scale flyers will fly in rate mode, but they would do it in normal mode, not idle 1......

Skarn

[BryMeister]

I agree with Maxime30...set everymode to 72% unless you are tweaking the gyro. Most never fly in anything other than HH mode. Scale flyers will fly in rate mode, but they would do it in normal mode, not idle 1......

Skarn

I agree with Skarn. There is no reason to fly in rate mode when you have a super-expensive gyro that keeps you HH mode! :thumbup:

[superblue]

Dang! I had my 450 working great with the telebee and then upgraded to the 401.

I watched Jermo's video on the dx7, Bob's on 401 and I got confused between the two video's and the million posts about them.

I guess you can either use the gyro sense or not.

I was getting binding before I switched to the gyro sense mode then after watching Jermo's video i used teh gyro sense mode and I don't get binding but the rudder rotor goes all the way at like 25% throttle but it does not bind.

I don't care about using normal mode. I am happy using HH mode all the time.

I turned the limit pot all the way down and still get binding... I am on the closest hole in (7.5mm from screw hole to ball joint on the servo)

Am I missing someting?

Todd

[Finless]

It is NORMAL for the pitch slider to go all the way over with only say 25% rudder stick input ON THE BENCH. In the air it wont do that. The gyro is expecting the tail to move when you give rudder input and on the bench the tail is not moving so it goes over all the way. Again this is normal for a HH gyro like the 401.

Bob

[superblue]

Awesome. So It is good to use the gyro sense mode then? better than the dual mode? Seems like it to me.

Thanks again for all the vids.

Todd

[Maxime30]

The gyro sens menu will let you assign a different gain value for each flight mode. If you use the gear channel, you can program two different gain (usually HH and Normal). You manually switch between HH and normal when using the gear channel.


The gyro sens menu can be usefull if you want to automatically have a different gain value for each flight mode (normal, idle-up 1, idle-up 2...), but personnally I don't think this is needed. I talked to one of the best pilots in the world during a Fun-Fly, and he said he use the same gain value in each flight modes...


But I still use this gyro sens mode on my 9303 (same gain in every modes), otherwise I could'nt use the governor mode with my 7ch rx :)

[superblue]

Well,
I am still a tiny bit confused but I am a newbie. I think it is really starting to sink in now though. I just hovered 3 batteries and the blade tracking seems fine, the tail is more stable than anything I have ever flown before. I noticed that I tend to hold the tail and hold the cyclic and don't really need to. I forced my self to let go of the controls and it still stayed solid. I need to get over "over controlling it". and shaking, wobbly knees, heart rate.....remember to breathe! :YeaBaby:

Anyhow when I do let off controls it has a slight tail drift. I mean ever so slight but there is a little wind here today. I would say the tail stays solid for 3 seconds, then I need to give it some input to bring it back. I will read how to up the gain until it hunts and then back off. Not totally sure what hunt is yet.

The most amazing part is that it hovers so rock solid. It barley even drifts in the wind. One click of trim countered the 5-10 mph wind. I also started with no training gear so I won't be getting dependent on ping pong balls.

Thanks so much Finless for your time and help.

Todd

[Skarn]

The most amazing part is that it hovers so rock solid. It barley even drifts in the wind. One click of trim countered the 5-10 mph wind.
Todd

You really shouldn't use trim to counter wind. Use your mind and stick controls.

What happens when the wind dies down or is gusty? Or you forget to get rid of the trim before your next flight?

If mechanically set up correctly, regular trim is not needed at all.

Good luck,
Skarn

[kianhon]

Where is Version2 setup video?