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700 Class Electric Helicopters 700 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 10-27-2013, 07:22 PM   #1
hoody_s13
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Default Reason my Trex700 likes high gyro gain?

Hi guys,

I just got my new trex 700e in the air last weekend, and in the middle of tuning the gyro.
Only have one set of packs, so it's been a slow process, along with first flight checks.

I've set up 3 governed headspeeds, normal is 1850, idle1 is 1950, idle2 2000.

For the moment, normal gyro is set I 60% in HH (DX8).
I'm working on idle1, and got it comfortable at 80%. Got oscillation as low as 83-84%, sky backed it off 3 more points.

My question is this. Why is the percentage value so high? I've read a lot of people are around the 60-70% mark in HH, similar HS.

Any particular reason why some models like higher or lower gains?

This is also using a AR7200BX.
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Old 10-27-2013, 08:10 PM   #2
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I have mine set lower also, I'd have to look, but it's around 60, but it is also a V3 so it has a higher tail speed and I run 115 tails.
What tail blades are you using?
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Old 10-27-2013, 10:08 PM   #3
hoody_s13
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I'm pretty sure mines the V2, I believe it's the first FBL model, obviously no DFC head.
Sound right? Has the white canopy.

I'm running the stock 105mm cf align blades.
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Old 10-28-2013, 12:36 AM   #4
el guapo
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the white canopy is a V1.

I have a V1....

the V1 and V2 have a slower tail ratio. the tail spins slow, so it was very common to use larger tail blades and higher head speeds.

the V3 gears fit on the V1. get the black gears. you do have to file down the counter bearing a tiny bit but it is totally worth it.
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Old 10-28-2013, 12:51 AM   #5
Bladefx
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Tail gain values vary for many reasons
Head speed
tail gear ratio
tail blade size
distance of ball on servo horn
type of tail servo
mechanical gain if any for tail rotor linkage arm.
vibrations
tuning
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Old 10-28-2013, 08:03 AM   #6
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Quote:
Originally Posted by Bladefx View Post
Tail gain values vary for many reasons
Head speed
tail gear ratio
tail blade size
distance of ball on servo horn
type of tail servo
mechanical gain if any for tail rotor linkage arm.
vibrations
tuning
... and play! The more play in the tail mechanics, the less gyro gain is possible
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Old 10-28-2013, 10:35 AM   #7
hoody_s13
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I'll hang onto the current tail setup, until the inevitable happens and I upgrade parts.

My main concern, was checking that there was no obvious issue with having to run a high gyro gain on my setup.

If everyone says it's fine, I'll leave the setup with its high gain of 80%.
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Old 10-28-2013, 02:13 PM   #8
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higher gain will work the tail a lil bit harder, just check the servo temp after a flight to be sure it's not hot.
other than that nothing to worry about
none of my helis have the same gain%. If I remember right the highest I have is 72% on my 600N.
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Old 10-28-2013, 04:40 PM   #9
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My tail gain is 110 of 120 on both birds. No problema... 8-)
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Old 10-28-2013, 04:45 PM   #10
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I find that on the 3gx and ikon, I have to put the travel adjust of the gyro above 100% for it to match what the unit sees. In other words, on my 550 I had my radio set ~85%, but in the software, the ikon showed about 50%. I raised the travel adjust to match the two readings, and now it's set ~48% (radio and software).

Between my 2 ikons and 1 3gx, none of them matched values with the radio at 100% travel.

Might be a situation similar to that.
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Old 10-28-2013, 05:48 PM   #11
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K2 you freak those are your end points for piro rate
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Old 10-28-2013, 06:24 PM   #12
K2Freak
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Negative Ghost rider. Rudder gain. It goes up to 120 but I have heard you can enter a higher number...

End point and piro rate are separate in VBar.

Granted, the way i have it set the transmitter is mostly out of the picture.

You definitely got the freak part right!
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Old 10-28-2013, 11:21 PM   #13
hoody_s13
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K2 you advised I should get the DS650 onto 6v instead of regulated 5.1v.

This a factor that would effect gain?
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Old 10-29-2013, 08:55 AM   #14
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I expect that increasing the voltage might require reducing the gain a little, but i guess there's one way to find out. Its safe at 6v regardless.
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