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Radio - Futaba FASST > inconsistant piro rate? ON THE GY520!!!!? FOUND THE PROBLEM!
 
 
helidevil
Veteran
Location: ME

My Posts This: Topic  Forum

like i said, its set up in rate mode PERFECT! travel is PERFECT! the travel and d/r are all at 100% or below 100%, PERFECT!

Its not a crash, its an upgrade opportunity!
10-24-2009 01:35 PM
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Dr.Ben
rrProfessor
Location: Richmond, VA, USA

My Posts This: Topic  Forum		1. Is the tail trimmed out mechanically in rate mode?

2. What t/r servo?

3. Does the posted gain represent the most the model will tolerate without a wag?

Ben Minor

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines
10-24-2009 02:06 PM
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helidevil
Veteran
Location: ME

My Posts This: Topic  Forum
Quote 
1. Is the tail trimmed out mechanically in rate mode?

OMFG! what did i JUST SAY! yesyesyesyesyesyesyesyesyesyes! it is "trimmed out in rate mode"

and yes, the gain is at its highest.

Its not a crash, its an upgrade opportunity!
10-24-2009 03:19 PM
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Wingman77
Elite Veteran
Location: Pulaski TN US

My Posts This: Topic  Forum		what is it with dumbass people on this thread not wanting to read and figure out what is going on....

34.6% of all statistics are made up on the spot
10-24-2009 03:24 PM
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fenderstrat
rrProfessor
Location: Aston,Pa

My Posts This: Topic  Forum		has it always done this,or did it just start acting like this.

if it just started acting this way,then something must have changed,and if you did not adjust the gyro itself,then the only other posibility is something on the heli has changed/shifted.

PerformancePlusRC field rep
COMPASS helis field rep
Mini Titan/SE
HBK2
Futaba FASST
10-24-2009 03:36 PM
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helidevil
Veteran
Location: ME

My Posts This: Topic  Forum		no idea

wingman77 thanks for all the help. i think i might have found part of the prob.

my tail pushrod is bowed because of the guide in the middle of the tailboom. ill try to get pics asap.

and considering that i have only had the heli&gyro for a couple weeks means that the gyro has always been doing this.

Its not a crash, its an upgrade opportunity!
10-24-2009 03:38 PM
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stocky
Key Veteran
Location: MA, USA

My Posts This: Topic  Forum
Quote 
my tail pushrod is bowed because of the guide in the middle of the tailboom. ill try to get pics asap

Helidevil

A guy down at RCHover showed me a mod he did to his 250.
He took a carbon Fiber Rod (Jeremy has them) and CA'd the metal 250 rod inside the CF rod and reattached the rod links. The guides are taken off and not used.
The resulting tail rod is solid and does not bend or bow and no possibility of binding on the guides as they are not there.
10-24-2009 03:47 PM
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fenderstrat
rrProfessor
Location: Aston,Pa

My Posts This: Topic  Forum		I dont think any of my questions have been dumb,just trying to gather info to help

PerformancePlusRC field rep
COMPASS helis field rep
Mini Titan/SE
HBK2
Futaba FASST
10-24-2009 03:53 PM
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helidevil
Veteran
Location: ME

My Posts This: Topic  Forum		STOCKY!

there you are! great seeing you there! ill have to try that mod.

Its not a crash, its an upgrade opportunity!
10-24-2009 03:56 PM
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red_z06
Elite Veteran
Location: Dumont, NJ

My Posts This: Topic  Forum		Devon

Unless you are using very long servo arm (in this case it lowers gain for same sensitivity), most of the gyros I have used (no 520), settled around 30-45% range of gain. So, I'm suspecting your gain set is good for normal range of holding but blowing out at fast speeds. Although it holds like a rock, I suggest you start increasing gain and do the fast forward and fast funnel to see if the tail hunts. You do this until it does and back off until the tail is solid.

BTW, as you increase your gain, you will notice your piro rate at full rudder will decrease. So, after you settled on your gain setting, you will have to adjust rudder ATV (increase) until you come to a piro rate you are comfortable with. In most cases, both left and right will be same but sometimes, you will have to adjust left and right ATV separately so the piro rate will be similar.

Edit: I just remembered that you are flying a 200 or 250. For these all bets are off on numbers as above apply mostly to larger helis.

www.JustinJee.com
10-24-2009 04:35 PM
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PJRono
Veteran
Location: Land of 10,000+ Mosquitos!

My Posts This: Topic  Forum		Before you tell me I'm wrong. Going over 100% on dual rates does make a difference in how the gyro performs. I had my 520 ATVs maxxed out at 150 and the D/R were only at 100, this limited the gyro's piro speed and consistancy. Once I went over the 100% on the Dual Rates things got better. But the length of the servo arm and servo used make a huge difference too as red_z06 brought up.

Just sit right back and I'll tell a tale, a tale of a fateful trip. That started from...
10-24-2009 05:21 PM
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helidevil
Veteran
Location: ME

My Posts This: Topic  Forum		the gain is at its highest now. 23% is flying normally without hunting. (a little here and there on some tricks)

pjrono: what your saying is that if i increas the rudd travel on the tx, the piro consistancy will be better? now its at 100% i could care about adjusting the piro speed, ill do that later.

Its not a crash, its an upgrade opportunity!
10-24-2009 08:01 PM
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Wingman77
Elite Veteran
Location: Pulaski TN US

My Posts This: Topic  Forum		changing the travel on the rudder channel will have NO effect whatsoever on piro consistancy, only speed.

34.6% of all statistics are made up on the spot
10-24-2009 08:43 PM
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Dr.Ben
rrProfessor
Location: Richmond, VA, USA

My Posts This: Topic  Forum		I asked more specifically about exactly how it had been trimmed out in rate mode because I've had guys do it differently.

I asked respectful questions trying to be of help.

I wish you the best in getting your gyro sorted out.

Ben Minor

Representing
MRC Hirobo Helicopters and Team Futaba for Radios
Morgan Fuels
OS Engines
10-25-2009 02:11 AM
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helidevil
Veteran
Location: ME

My Posts This: Topic  Forum		you mean trimmed out as in the piro speed set up correctaly? i dont know what you mean.

and sorry for freaking out at you, i thought you meant no drifting in rate mode, or along the lines of that.

heres pics of the tail pushrod, and the current tailservo



Edit: how fast should the response time be? slow, normal, or fast?

Its not a crash, its an upgrade opportunity!
10-25-2009 02:26 AM
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PJRono
Veteran
Location: Land of 10,000+ Mosquitos!

My Posts This: Topic  Forum		By going over the 100% does increase speed but also does something to help even out the piro. I had a simular problem with L-R consistancy until I increased mine over the 100% in D/R. For some reason even though the ATVs are maxxed, the D/Rs override them. You would think 100% would be 100% (or 150) of the ATVs, but it's not. Go figure!

Just sit right back and I'll tell a tale, a tale of a fateful trip. That started from...
10-25-2009 04:16 AM
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helidevil
Veteran
Location: ME

My Posts This: Topic  Forum		so if i increas the rudd atv on the tx *not the d/r* the piro speed might be off a little bit, but overall it will perform better?

Its not a crash, its an upgrade opportunity!
10-25-2009 04:19 AM
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helidevil
Veteran
Location: ME

My Posts This: Topic  Forum		anyone else?

Its not a crash, its an upgrade opportunity!
10-25-2009 11:32 PM
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jschenck
Elite Veteran
Location: La Vista, NE.

My Posts This: Topic  Forum
Quote 
A guy down at RCHover showed me a mod he did to his 250.
He took a carbon Fiber Rod (Jeremy has them) and CA'd the metal 250 rod inside the CF rod and reattached the rod links. The guides are taken off and not used.
The resulting tail rod is solid and does not bend or bow and no possibility of binding on the guides as they are not there.

I have been doing this for my 450's and 250's since I got my 2nd 450. (first one was an MX400, that doesn't count )

To try and keep the weight down, especially on the tail heavy 250 I clipped the last 1" of the rod off on either side and epoxied them into place in the CF tube, I use JB Weld. To really make it look nice put a piece of black shrink wrap over the ends.

Simply replacing the bendy tail control wire with a CF rod makes a HUGE difference on my small heli's. Bonus no control rod hoops to deal with.

Oh, and you can change from 3D to F3C mode via the blinky lights on the 520.

.. P-gas, T700, V50c/u, R50T, T4/250 and a Cricket ..
10-26-2009 03:13 AM
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eggmcmuffinplz
Elite Veteran
Location: Los Angeles, CA

My Posts This: Topic  Forum		Lets see a list of your settings on the 520.

I know for a fact F3C mode works better for piro consistency, and ive used this on both my 611 and 520 and found it to be better, and the holding power was just as good as 3D mode.

Also, what "heli mode" are you flying in?

Scott D
Logo 500 3D V-bar
10-26-2009 03:35 AM
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Radio - Futaba FASST > inconsistant piro rate? ON THE GY520!!!!? FOUND THE PROBLEM!
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