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HelicopterMain Discussion › heli drifting to the right
07-10-2008 01:00 PM  9 years agoPost 21
Nightstalker

rrElite Veteran

UK (BEDFORDSHIRE)

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How far out do you have the ball on the servo horn?? your looking to be around 14mm. if your at this then come in more and up the gain till the tail wags then back off.

Iv had years with these 401s and its always been down to the ball on the servo not being at the right distant out, get it to 14mm use no trims or mixing,

Also it might be your gyro mount is to hard so you get drift so might be worth changing that for something abit softer

Dont be afraid to do what the book says but keep upping the gain till it wags and back it off abit, some will say dont do this as it can burn the servo out but never seen it happen with mine in the years iv used them.

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07-10-2008 01:03 PM  9 years agoPost 22
helimatt

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Lafayette, IN

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How do I find the source of vibration, it seems like the whole heli vibrates more or less :-)
By all means go through the process as everyone is saying, get the gyro to hold in a hover no drift (or very little) in RATE mode first.

But per your quote above, if you have vibration then the more you can do to resolve it, the better the gyro will perform.

Make sure main blades are matched for c.g., and balanced. check with the mains off that the main rotor head/paddles run smooth. Make sure the flybar and paddles are exactly the same distance each side from the head block. If the head vibrates, check for bent parts/shaft, and then try to smooth it out by adding some tape to one or the other paddle until its better. Trial and error.

A similar process for the tail rotor. Run it up with no tail blades (and no Mains ), is it smooth? If not find out why and correct. then add the tail blades, and if you have vibes, add a bit of tape to one or the other approx. mid-span, until it runs smooth.

Anything bent or not concentric can cause vibration. The motor (even electrics) can be sources of high-frequency vibration, many electric motors are rather cheaply constructed and don't run very smooth so you might move the motor away from the main gear, spin it up and see if its smooth. Don't overspeed the motor (use part throttle).

A sensitive scale is very useful for balancing parts (.1 gram resolution or more sensitive). Not completely necessary though.

If after all those efforts the gyro still won't hold without drift in HH mode, then perhaps swap in another gryo. Yours might need factory recalibration or repair.

Good luck and let us know how you fare.

Never, ever, ever, ever give up.

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07-10-2008 01:15 PM  9 years agoPost 23
pgrbff

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Piemonte, Italy

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I've always found the 401 pretty much plug n play.
Get the mechanical set up right to start, and you'll probably find that fixes the problem.
If not, you can start looking for other problems.

Proficient at turning cash and credit into smoke and noise!

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07-10-2008 01:25 PM  9 years agoPost 24
mille

rrApprentice

Stockholm Sweden

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ok I will try this. Just to make sure I have the DX7 and have assigned the gain in aux2. Shouldnt I be able to flip between heading hold and rate mode with the aux2 switch, because this I can not do??

M

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07-10-2008 01:35 PM  9 years agoPost 25
pgrbff

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Piemonte, Italy

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You should be able to flip between heading hold and rate.
I dont know enough about the DX7 to help out with the programming.
I'm sure there are many on Runryder who can and will.

Proficient at turning cash and credit into smoke and noise!

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07-10-2008 01:57 PM  9 years agoPost 26
mille

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Stockholm Sweden

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ok anyone else? I'm really lost here ...

As I understand if I switch from HH to rate the light should go off on the gyro, which it doesn't ...

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07-10-2008 02:33 PM  9 years agoPost 27
Raptor Pilot

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Northern Ireland U.K

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I dont know anything about the DX7 but something isnt programed right or else the DX7 is not communicating correctly with the gyro because the red light should go on and off when you switch between the two modes. I had the same problem with a Multiplex MC3030 transmitter and the cure was to buy myself a futaba 9C Super transmitter. Look in the raptor technique web site under electronics and you will find a shed load about the 401 and how to set it up with loads of differnt transmitters.There is one which shows you how to set it up with the DX7 so it looks like it will work. Hope this helps.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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07-10-2008 03:07 PM  9 years agoPost 28
pgrbff

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Piemonte, Italy

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http://www.raptortechnique.com/gy401-dx7.htm

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07-10-2008 04:37 PM  9 years agoPost 29
Nightstalker

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UK (BEDFORDSHIRE)

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what % do you have HH and Normal mode on the TX???

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07-10-2008 04:50 PM  9 years agoPost 30
Mavrik1

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USA

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I had a bad tail drift problem for the longest time, I normally set the motor gear spacing with the recommended "paper" spacer. I increased this clearance amount (2X as a guess) and my drift problem nearly disappeared. I haven't set to hover in rate mode. I also use dry lube (brush-on liquid) on the main gear as well to reduce friction.

The bottom line is having fun.

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07-10-2008 05:20 PM  9 years agoPost 31
Frank Bostwick

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Cincinnati Ohio

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Ill go check but I think on a DX7 you need to go into the set up mode (buttons pushed B4 switch on) and tell the radio you are going to use Aux2 for gyro scence. Ill go check and post back

RIP ROMAN

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07-10-2008 05:31 PM  9 years agoPost 32
Frank Bostwick

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Cincinnati Ohio

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OK, I may have something messed up but my 401 works good with my DX7. In set up menu (Buttons pushed at switch on) go to AUX2 Gear screen. I use my gear chanl so I have aux2 on INH, and gear set to gear, (seems like that should be set to gyro but when I do it, the 401, wont switch between HH and rate) ANyway I have gear set to gear. Then in the adjustment screen for ATV I have the gear chnl set to 60 on switch forward and 46 switch back. Just read the book. Page 74, Gear: gear is slected if you gyro gain is switched using gear chnl.

RIP ROMAN

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07-10-2008 05:34 PM  9 years agoPost 33
Frank Bostwick

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Cincinnati Ohio

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Reading this over see page 91 will post back because ATV SHOULD be used to set PIRO rate NOT senitivity. Mine may work but not "right"

RIP ROMAN

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07-10-2008 09:12 PM  9 years agoPost 34
Frank Bostwick

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Cincinnati Ohio

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Yep that link tells it well. Just like mine is set up. Funny thing is, when the gear chanl is in the "rate position", no matter where I set my ATVs, the gyro will not go into HH mode. Even after a reboot and n matter what the ATV setting for the HH mode is.

RIP ROMAN

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07-11-2008 12:21 PM  9 years agoPost 35
SNOOPY BC

rrNovice

brighton,mi. usa

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Bob's tech room on Helifreak.com has complete build vidios on the hurricane 550 using the 401 gyro and the DX7 radio. I think you should down load all of the series and watch them. His vidios are the best thing you could have.

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07-11-2008 04:40 PM  9 years agoPost 36
mille

rrApprentice

Stockholm Sweden

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ok now I think I have the radio set correctly.

What should my gain be in normal mode?

So as I understand I hover it in normal mode, set the tail pitch until very little or no drift then switch to HH and the tail should hold.

I will try this but as above need a number for the gain in normal mode.

M

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07-11-2008 04:43 PM  9 years agoPost 37
Frank Bostwick

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Cincinnati Ohio

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Anything over 50% is HH, so you need to be below 50% (atv gyro senc. chnl)

RIP ROMAN

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07-11-2008 07:01 PM  9 years agoPost 38
mille

rrApprentice

Stockholm Sweden

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thanks everyone. this is solved, I had to move the ball to the outher hole and now the tail holds straight :-)

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HelicopterMain Discussion › heli drifting to the right
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