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HelicopterBeginners Corner › Gyro setting
10-07-2005 04:38 AM  12 years agoPost 1
Rum95

rrApprentice

Puerto Rico

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Hi;

I’ve been trying to figure out the gyro setting…the futaba gy401 has a Dir(nor/rev) switch and the tx(futaba 7cap) has a setting for reversing the channels too. I don’t get it, do they cancel each other out? Do they have to match?....

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10-07-2005 04:44 AM  12 years agoPost 2
shuttlepilot

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Mullins, South​Carolina

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The reverse in the tx menu basically reverses the switch that switches modes between hh and non hh. The reverse on the gyro actually reverses the way the gyro senses. I hope this makes sense to you. At least this is what it does on my 8U....which is very similiar in the menus.

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10-07-2005 01:38 PM  12 years agoPost 3
BarracudaHockey

rrMaster

Jacksonville FL

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http://www.futaba-rc.com/team/team-tip-002.html

What helicopter you installing it on?

Andy
AMA 77227
http://www.jaxrc.com

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10-07-2005 04:39 PM  12 years agoPost 4
chuckhager

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Clovis, CA

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I think that Rum95 is referring to the direction of servo throw between the (DIR) switch on the gyro and the servo reversing function on the transmitter.

The answer is no they do not cancel each other out. They each need to be setup correctly. The (DIR) switch on the GY-401 must react or move in the correct direction when the heli yaws without you moving the stick on the transmitter. If you rotate the heli to the right, then you should see the tail rotor try and correct back to the left. The direction all depends on which way your main rotor turns.

The servo direction must respond in the correct direction when you move the rudder stick on the transmitter. Move stick left and the tail blades must move in a direction that would make the heli rotate counter clockwise.

This is a general answer. Let us know if you need more detail. If you let us know what heli you have, that will tell us which direction you need to set it up for.

Chuck Hager

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10-07-2005 04:48 PM  12 years agoPost 5
shuttlepilot

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Mullins, South​Carolina

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I would think that you would first want to set your tail servo to work correctly without the gyro in the mix. You would do this by using the dir. settings for the rudder on the tx. Then put your gyro in and make sure, as chuckhager said, that the gyro compensates correctly when you rotate the nose left or right. The reverse setting on the gyro controls this. In other words, if the gyro corrects the wrong way, then switch the reverse on the gyro itself. I still think that the gyro dir. setting in the menu on the tx controls the switch throw for hh and non hh. Clear as mud huh

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10-07-2005 04:51 PM  12 years agoPost 6
chuckhager

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Clovis, CA

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Correct. Set your servo direction first. I thought about changing the order in my post and wondered if anyone would catch that.

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10-07-2005 05:53 PM  12 years agoPost 7
Rum95

rrApprentice

Puerto Rico

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Hi guys;

I have a electric Shogun…I understand a lot better now the settings for rudder and gyro, I really appreciate that. What’s still fuzzy is the sensitivity setting plugged in channel 5(Futaba R127DF- 7 Channel FM). What’s the effect of having it normal or reverse?

Thanks

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10-07-2005 06:53 PM  12 years agoPost 8
shuttlepilot

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Mullins, South​Carolina

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I don't think I'm using the sensitivity plug on mine. I control pirroette rate by atv on the rudd servo and sensitivity on the gyro by the atv settings on the gyro menu from tx.

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10-07-2005 06:58 PM  12 years agoPost 9
Wisdom-Seeker

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Danville, CA

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I don't think I'm using the sensitivity plug on mine.

You cannot control the 401 without connecting the sensitivity plug into a receiver channel. The sensitivity plug controls both mode (AVCS/Rate) and gain. Your gyro setting in the Tx cannot communicate with the gyro itself unless the sensitivity plug is connected.

--

Wisdom-Seeker
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10-07-2005 07:13 PM  12 years agoPost 10
BarracudaHockey

rrMaster

Jacksonville FL

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The only thing the channel 5 (sensitivity) reverse does is change the switch position for heading hold/rate mode.

For example if your switch was down, and you turned on the rx and the gyro light came on steady (meaning HH) that would make the switch DOWN for HH and UP for RATE. If you were to reverse that channel you would need to put the switch UP for heading hold and DOWN for rate.

As Wisdom-Seeker said, if you dont have that single wire plugged in with the correct signal, the gyro wont initialize and you'll never get it working right.

Andy
AMA 77227
http://www.jaxrc.com

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10-07-2005 07:25 PM  12 years agoPost 11
BarracudaHockey

rrMaster

Jacksonville FL

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Shuttle Pilot, you are using the sensitivity wire, you just using built in programming. Your doing the same thing.

Rum- To summarize, understand the following points.

Set your rudder atv's to 100 then use the LIMIT pot on the gyro to set how far your rudder servo moves. Your rudder atv's now control how fast your helicopter spins or piro's. If your rudder is too sensitive reduce the atv's till your happy with it, if it doenst spin fast enough, crank up the atv's a few percent at a time till your happy.

Your gyro gain is set by the atv's on the gear channel, usually 5. If you think of it like a slider or knob instead of a switch it helps to visualize whats going on. With the knob all the way one way, say left for our example, thats 100 precent gain in HH mode. Start turning the knob to the right and gain in HH decreases till you hit the half way mark on the knob, now your at zero gain in either mode, as you keep turning right you've now set it to rate mode and are starting to increase the gain. When you make it to full right with the knob your at 100 percent gain in rate(normal) mode. With a switch you get 2 end points where your knob can land on either side of the half way point. So if your atv's are at 50 percent of throw to the left of center and 100 percent to the right thats HH mode with 1/2 of the available gain with the switch one way and Rate mode with 100 percent gain with the switch the other way.

50 percent each way is a good starting point. If its not holding incrase it a bit and if the tail is wagging decrease it a bit. Always ensure you power up the tx first and put the switch in HH mode. Turn on the rx and dont touch anything till the light comes on steady.

Note that in Heading Hold mode on the ground, servo behavior won't be what you expect, it won't return to center like a cyclic servo will, this is normal and it works in the air.

Andy
AMA 77227
http://www.jaxrc.com

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10-08-2005 01:49 AM  12 years agoPost 12
chuckhager

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Clovis, CA

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I think what Rum95 is saying is that he doesn't understand the difference between heading hold and rate mode.

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10-08-2005 04:21 AM  12 years agoPost 13
Rum95

rrApprentice

Puerto Rico

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Hi;

My heli was setup buy the shop owner from my LHS. As I kept learning more about the settings I notice that my gyro’s light was always blinking. Everything I read tells me that I should always start the heli in HH mode and that was something I didn’t know how to do.

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10-08-2005 06:02 AM  12 years agoPost 14
shuttlepilot

rrElite Veteran

Mullins, South​Carolina

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barracudahockey

Your absolutely right. I had a yellow wire loose in my installation, but it was comming from from and entension on my voltwatch......my bad.....had a brain fart. Rum95......barracuda has the stup nailed.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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