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HeliProz . ZoomsHobbies . HeliHobby

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Aerial Photography and Video > First HC flight ... could do with some input please!
 
 
rerazor
Elite Veteran
Location: Mich.

espritmodels.com has them.
04-02-2008 05:44 PM
 
 
ale_modellirc
Heliman
Location: Rome - Italy

Quote
--------------------------------------------------------------------------------

I still have not heard how people are setting up their heads correctly with helicommand. I have too much cyclic pitch and need to reduce it, and I'm not sure if my swash is exactly level. I usually make these adjustments in the radio, so now I use the software from helicommmand --------------------------------------------------------------------------------

From: www.helicommand.com:
"The auto-pilot and its horizontal stabilisation have nothing to do with automatic trim, i.e. the automatic trim system is completely independent of the stabilisation system. Clearly this is frequently misunderstood. With or without the auto-pilot function, automatic trim defines the correct neutral position for aileron and elevator, and applies this exclusively to the servo positions. It is even possible to make use of the automatic trim feature when the auto-pilot is switched off, and vice versa.


If you find that the aileron or elevator axis is not at neutral, i.e. you have to adjust the trims manually even though the auto-pilot is in operation, the reason is usually a mis-match between the transmitter centres and the auto-pilot. This can easily happen if you adjust the transmitter trims manually, but fail to “inform” the unit (learning process) using the Set button. Trimming is very simple - provided that you observe the instructions!"

check page 23 for the right procedure to set the trim (not autotrim) and level the swash plate....

Raptor Titan 50, OS Hyper 50, MP quiet2, GY 611, SAB 600mm, T14MZ
05-05-2008 02:02 PM
HOMEPAGE  
 
 
Qinetiqemc
New Heliman
Location: Somerset - UK

I have some questions which I hope someone can answer after reading the above post.

1) Does this mean that if the swashplate is not absolutely level then the software will compensate for it?
2) There are boxes on the RC & Trim Tab labelled Transmitter Neutral, should these ideally be reading 0?
3) Is it best to set travel limits in the software or on the Transmitter?

Thanks.

Ian
05-08-2008 12:15 AM
 
 
rerazor
Elite Veteran
Location: Mich.

1. Yes it could, but you want to set your swash mechanically as level as possible (just as you would with any heli)

2. No, very rarely will your heli hover perfectly level even with a "mechanically" leveled swash (ex. CG could be off, rotor torque etc.)

3. In the software.
05-08-2008 12:53 AM
 
 
Qinetiqemc
New Heliman
Location: Somerset - UK

rerazor Thank you for a swift response.

I'm going to use the internal gyro, to free up a channel for the Pilot signal as I only have a six channel Rx fitted.

How do I get it into Normal mode so that I can check the tail servo end points?

Is it just a matter of using the software and setting it on the Gyro tab? (Remembering to write the change.)

Thanks,

Ian
05-08-2008 08:05 AM
 
 
rerazor
Elite Veteran
Location: Mich.

I have never used the internal gyro before.

I'm sure somebody on here can help you on that setup.
05-08-2008 01:49 PM
 
 
Hogster
Key Veteran
Location: Surrey, UK

Have a look at P11 and P20 of the manual:

http://www.helicommand.com/media/gu..._1-6_en_cap.pdf

Using the software you can set the tail gyro gain using the AUX channel (-100% being maximum normal gain, 0% being 0 gain, +100% being maximum heading hold gain). Then, to free up the AUX channel for the auto-trim function, I fixed my chosen gain value in the software, and now I only use the AUX channel for the auto-trim function .... oh, and I've set up a mix on my transmitter for that channel to activate my shutter servo using another part of the AUX channel's throw ... (see this thread)



Hope this helps


David
05-08-2008 03:00 PM
HOMEPAGE  
 
 
Qinetiqemc
New Heliman
Location: Somerset - UK

Thanks David,
I will be setting the gyro gain using the software to a fixed level as I don't have a spare channel unless I change receivers.

rerazor gave me an answer about swash levelling.

If you had "mechanically" levelled it, as best you could, then am I right in thinking that, on a level surface, you could then use the software and keep adjusting it until the RC&Trim boxes are minimum value?
Or does it not really matter as long as it is nearly level?

Does anyone have a saved HC file for a TRex 450 that they can sed me for comparison?

Ian
05-08-2008 08:07 PM
 
 
rerazor
Elite Veteran
Location: Mich.

Don't worry about the trim values in the software. They will change each time you "auto-trim" or do the "set" button procedure.

Auto-trim = Hold a level hover for 8 seconds and flip the auto-trim switch on/off and that will be you new level setting.
05-08-2008 09:40 PM
 
 
Crazy-Joe
Heliman
Location: Germany

Hey guys,
using the autotrim function is really the best, easiest and fastest way to go for a stable hover, of course after having adjusted the swash mechanicaly as best as possible. Sure, the HC can compensate tolerances in the mechanical adjustment in some way, but it will work best if these are eliminated right from the beginning.
Cheers,
Joe
05-09-2008 01:42 PM
 
 
Crazy-Joe
Heliman
Location: Germany

Just one more little issue: the autotrim does not trim the tail in any way!
Cheers,
Joe
06-05-2008 11:39 AM
 
 
Hogster
Key Veteran
Location: Surrey, UK

Really? Why is there a slider for 'tail servo (from internal gyro)' under the heading 'Internal Autotrim settings'?



Thanks


David
06-05-2008 11:47 AM
HOMEPAGE  
 
 
rerazor
Elite Veteran
Location: Mich.

I don't use the internal gyro but from my understanding the auto-trim does trim the tail each time.
06-05-2008 01:08 PM
 
 
Hogster
Key Veteran
Location: Surrey, UK

Mmm that's what I have assumed. It would make sense to have it work that way, as by keeping the tail steady manually will show the HC what a 'steady' tail looks like .... just like manually holding a hover shows the HC what a 'steady' hover looks like.


David
06-05-2008 01:27 PM
HOMEPAGE  
 
 
Crazy-Joe
Heliman
Location: Germany

Of course, you are completely right. My fault. Got that mixed up with the SET button proceedure for learning the stick middle. This does not affect the tail. The autotrim of course does. So sorry for generating confusion
Cheers,
Joe
06-10-2008 12:05 PM
 
 
Hogster
Key Veteran
Location: Surrey, UK

Hehe no problem Joe


David
06-10-2008 01:12 PM
HOMEPAGE  
 
 
puneetp
Senior Heliman
Location: Bangalore, India

I had serious issue with my installation the first day , I followed instructions and got my raptor to fly with helicommand with high gain +80%.

Since the instructions asks to ensure that we bring to neutral positions , i reverted my trims during setup phase ( 5 step process ).

When I flew the heli started swaying and I had to give lots of inputs to hold it. I finished 1 tank fuel in observing and flying around , reducing and increasing gain.

I started giving manual trims ,but that didn't work.

My heli was trying to tumble side words dangerously. I got it back and cut the engine.

Now reading this posts I would want to switch on my auto trims. Will post my results

Meanwhile , have you seen any adverse affects on HC with engine vibration ? .I have tried to mount HC as away from the engine as I could ( yet as close to main shaft ), its below the tail gyro , point of meeting of tail boom and and chassis.

Thanks,
Puneet

Machine over Gravity
06-26-2008 05:51 PM
HOMEPAGE  
 
 
rroback
Key Veteran
Location: Irvine (UCI), Ca

Maybe turn your gain down? Did you check the hc direction? Is it compensating the correct way?

Rhett... There's no power like E Power!
06-26-2008 06:30 PM
 
 
nooobs
Veteran
Location: Toronto, Canada

Puneet

I've seen this happen. Your gain is definitely way too high. I think I have mine set to 40%.

What you want to do is set your slider so when you're at maximum the heli is not oscillating. So gradually increase your gain on the software slowly until you find the correct percentage before oscillation. You'll want to bring your laptop to the field.

I've just setup an HC on a Raptor as well. I didn't find the vibration affecting the HC at all. The HC was installed at the front facing to the right. The HC unit does not need to be near the main shaft.

As Rhett said make sure the HC unit is working properly. Do a bench test. Make sure the swash is moving in the opposite direction from how you're tilting the heli.

On top of the HC unit I would cover the PC data port with tape as the residue from the smoke can get in there. Better yet move the HC unit to the front, under the canopy and away from the smoke.
06-26-2008 11:26 PM
HOMEPAGE  
 
 
puneetp
Senior Heliman
Location: Bangalore, India

Dear Rehtt , I did check my direction and it was right , the helicopter was trying to do horizontal hold but kept on swaying.

I checked the swash movement on the ground by tilting heli to ensure I am not reversed.

Noobs: I think I will move it infront , I thought I had found a good position but you are right I don't want any of that oil sticking on the the lense cover of the HC. Will move it in front.

Meanwhile I will test out what you both have suggested and will let you know.

Thanks
Puneet

Machine over Gravity
06-27-2008 07:57 AM
HOMEPAGE  
 
 
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Aerial Photography and Video > First HC flight ... could do with some input please!
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