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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Why is the take of not straight.
11-25-2016 05:54 PM  3 years ago
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Thehunterboy

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Glamsbjerg

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Why is the take of not straight.
Hi all I am flying a Vibe E12 with the Forza f3c head.
Servo futaba topline and using TAGS mini af a FBL gyro.
All things are straight and 100% level wen the model are hovering it just flyes so nice hovering like a boss.
But i just got this problem in the take of the model always drift to the left quiet a lot, is that normal, ??
Wenn i look at videos of the top Pilotes the take of is straight.
I know all the thing with the tail maked the model drifting a bit aso.
I just feel it is to much and realy dont know how to get it fix.
I know i can use the controles, but just feel it is to much
Ps. I am not a newbeginner into rc helicopter.
I hope sombody can help me.
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11-25-2016 06:14 PM  3 years ago
artimus

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Buckley WA

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Most helis will go back at to the left if not corrected for which the fbl controller will do. It can get real technical explaining why but it a common flight behavior. Has to do with the lead lag of the blades and torque from the tail...Fly Hard......Team Viagra
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11-25-2016 07:00 PM  3 years ago
icanfly

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ontario

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not hard to explain, the tail rotor is pushing the heli sideways and the main rotor must lean a little to counter act the tail doing so in order to hold the heli in one place in reference to you during hover. Until the main rotor leans over the tail is pushing the heli.

Drifting sideways means the gyro's probably in rate mode. You might have to bump up cyclic gain.
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11-25-2016 07:37 PM  3 years ago
dkshema

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Cedar Rapids, IA

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Your helicopter has a tail rotor, whose action counteracts torque so the heli doesn't spin. That's nice.

Your heli has, most likely, a head that rotates clockwise [edited 11/30/2016, removed "counter"], viewed from above. Torque from the drive system will make the nose want to turn left, so the tail rotor needs to make the nose turn to the right. In order to do so, the tail rotor needs to make the tail of the heli turn to the left (viewed from above).

A side effect of this torque countering is that you have a lateral force applied to the helicopter, wanting to make it drift to the left. In the world of helicopters, this is known as "translating tendency."

If you take a look at your heli (standing behind it), in a hover, you will see that it has about a two-degree tilt to the right. Take a look at pics of helis in hover, you will see that tilt, which is there to counteract the leftward translating tendency. If you get a good close-up, you'll also see the swashplate with a slight right aileron tilt.

The "Pros" (and those of us who have learned to control our helicopters) automatically make the correction when taking off, and when hovering. If you're still fairly new to helis and flying, and the heli is still telling you what to do, it will take off, and drift to the left, unless you become smarter than your heli, and just before you lift off to a hover, feed in a small amount of right aileron, so that you will lift straight up. You may not be "new" to helis, but the helicopter is still flying YOU, YOU are not flying IT.

Has nothing to do with lead/lag of the main rotor. And since this phenomenon occurs in helis with flybars, the FBL controller is not the culprit.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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11-25-2016 09:19 PM  3 years ago
revmix

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NJ

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rigged lateral cyclic
check translating tendency
hands off hover
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11-25-2016 09:24 PM  3 years ago
Thehunterboy

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Glamsbjerg

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Thank you for all, i know there aleays will be som left drift wen take off,
I just feel it is quiet a lot but yes i can take of with the correction no problem, i was just not 100% shure if i made a mistake with the FBL gyro.
I will try adding a bit more hold gain just to se whal i happening.
Otherwise i will just correct also fly the heli
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11-25-2016 09:45 PM  3 years ago
dkshema

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Cedar Rapids, IA

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Unless somehow you're using a GPS input, the FBL controller is a gyro, not an inertial navigation unit. I don't believe it will or is able to correct for drift, as it does not include accelerometers to measure drift in any axis. Drift left or right is not a rotation about any axis. Sometimes, you just have to fly the darn thing yourself.

Of course, if I'm wrong, the beatings are about to begin.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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11-25-2016 10:41 PM  3 years ago
AirWolfRC

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42½ N, 83½ W

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All things are straight and 100% level wen the model are hovering it just flyes so nice hovering like a boss.
No it's not . . . look again when hovering tail in or nose in.
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11-25-2016 11:01 PM  3 years ago
Thehunterboy

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Glamsbjerg

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Airwolfrc the heli is hovering super it is just the dam lift of.
i just re tjekked all lewel on swash servo horns everything is 100%.
But ok i could just adjust the link to the swash and se if that would help, but then the swash is not level
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11-25-2016 11:09 PM  3 years ago
AirWolfRC

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Again, look closer in the hover.
The laws of physics say the rotor disk is NOT level.
How can it be?
It has to offset the side thrust of the tail rotor.
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11-25-2016 11:36 PM  3 years ago
Thehunterboy

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Glamsbjerg

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Ok so all is as it have to be, is there nothing to do i just have to compensate yes??
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11-25-2016 11:38 PM  3 years ago
JuanRodriguez

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The Villages, Florida

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YesBeen there, done that and old enough to know better.....
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11-25-2016 11:46 PM  3 years ago
Thehunterboy

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Glamsbjerg

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Super will do, now i can consentrate to fly and not to
Trim / adjust any more on the heli
Thanks
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11-25-2016 11:58 PM  3 years ago
JuanRodriguez

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The Villages, Florida

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Trim ????

Not sure about your particular FBL controller but for most, use of trim on the transmitter is a no no......
Been there, done that and old enough to know better.....
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11-26-2016 12:38 AM  3 years ago
mr dan

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Stockton Calif

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Normal for all helis to do this. What you see in the videos are the pilots correcting this natural movement. Its caused by the downward rotor wash ."R.I.P Roman" Citizen 0094 in the Nation
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11-26-2016 01:14 AM  3 years ago
revmix

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NJ

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FBL is kinda twitchy on the ground due to the 3 axis gyro (that's why your take off is not flawless), get used to it & airborne quick
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11-26-2016 01:21 AM  3 years ago
Thehunterboy

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Glamsbjerg

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Sorry i dont mean trim on the TX just.
That is a danisch word for adjusting tje heli. Adjusting in denmark is trim
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11-26-2016 03:02 AM  3 years ago
Gary Jenkins

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Nowhere, US

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Forget about trying to get a helicopter to hover perfect with your hands off the radio. Any change in the wind velocity (breeze) it will move. Learn to hover (take off, hover, and land) will noise into the wind and then start to work your way around 360 degrees so you can hover with the wind blowing in any direction. Next do it standing out side the circle. Then repeat these steps with helicopter out of trim to the: right, left, noise and tail. Now go with tail rotor out of trim drifting CW and CCW.
Think about it before you bitch at me. Some pilots fly with no center return.
When the winds are 25 mph with additional wind gust, the helicopter with never stay in a fixed location, with hands off the radio.
Parctice.
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11-27-2016 03:54 PM  3 years ago
Thehunterboy

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Glamsbjerg

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I increased the hold gain in the TAGS from 13 to 15 that helped yes i still have to correct in the take of but les than before.
Thanks all for the diffrend inputs
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11-27-2016 04:09 PM  3 years ago
mdu6

rrKey Veteran

Montreal

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One old trick with FB setups was to put a wedge under the left skid so the heli was slightly tilted on the right side.
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Why is the take of not straight.
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