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HeliHobby . Ron’s HeliProz South . Century Helicopter

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e-MS Composit Hornet > Hornet 2 and gy401 tail hunt!
 
 
Kristoffer
Senior Heliman
Location: Sweden

Hi im having a hard time setting up my hornet 2. I have balanced everything like eric larson is saying on his website. The problem is when im runing in idle up 1 the tail hunts like crasy! i cant fly in that mode?

But in normal mode when im just hovering the tail is perfect! The tail slider is very smooth, im starting to think that it maybe is the plastic fin where the servo is mounted that is bending, wich is causing the tail to hunt?

Also what gain settings are you using on the futaba 401 gyro? i cant run more that 25 in HH mode more than that the tail will hunt in normal mode. in idle upp the tail hunts like crazy even with like 15 in gain! I just think thats its pretty low? im having around 8 mm from from hole to hole. using a futaba 3110 micro servo on the tail.

Any advice here?

2xStratus, Gy611, ATG, YS91SR, SB19
Logo 14, Jazz 55, Hacker A50, 720
Wildcat 30
V-blades
11-13-2006 Over year old.
 
 
gotak
Senior Heliman
Location: Ontario, Canada

Do you have that servo on the end of tail thing or the default position? Most people would suggest that because they think it's slack. Actually the reason is the tail on H2 are one of those that's just weighted badly for the gyro to control. So yes moving the servo there might solve the problem cause it puts a big lump of mass at the tail and changes the dynamics of the tail.

"It's a diagram of my idea I don't have no freaking equations yet"
11-13-2006 Over year old.
 
 
DarkHorse1
Senior Heliman
Location: Gloucester UK

Some gyro's are happier with a bit of tail mass inertia but the 401 works fine on the light tail of the MaxIR, so unless you have a lot of slop, a slow servo or vibes on the gyro. I thought that the 3110 was fast enough for the tail although it is slightly slower than the standard HS-50. The most common cause of wag in HH mode is normally vibe related.
11-13-2006 Over year old.
HOMEPAGE  
 
 
Kristoffer
Senior Heliman
Location: Sweden

im having the servo on the tail fin. and using the stock plastic fin, and it flexies alot when im turning the tail, so i was thinking maybe that was a problem, maybe a carbon fin will fix it? but its just strange that the heli works fine in normal mode, and not in idle up.

but are you saying that the 401 gyro with 3110 servo, that its better to have the servo on the tail fin? i have not tested to have the servo in the stock position thou, on the boom?

2xStratus, Gy611, ATG, YS91SR, SB19
Logo 14, Jazz 55, Hacker A50, 720
Wildcat 30
V-blades
11-13-2006 Over year old.
 
 
DarkHorse1
Senior Heliman
Location: Gloucester UK

Should be fine where it is. Can you feel any vibes in the frame or tail boom when spooled up?
11-13-2006 Over year old.
HOMEPAGE  
 
 
Kristoffer
Senior Heliman
Location: Sweden

I changed the position on the gyro, i had it mounted in the front, and now i changed it to the orginal position behind the mast, and i think it got much better. I havent flown the heli that much yet, i have just hovered and it seems more solid.

But now i have another problem.

Should you be able to have 25mm between the tailblades when you fold them, and have the slider in the middle of the tail output shaft??

If im going to have around 25 mm the slider is maybe only 1 or 2 mm from the tail gearbox?

Also it turns much faster one way.

Does any of you have any good pictures of the tail when you have around 25 mm between the folded tailfins, i just want to see where your slider is positioned then?

Or can i just set the slider in the middle and just fly, im using a 401 gyro in it. and always fly in HH mode.

2xStratus, Gy611, ATG, YS91SR, SB19
Logo 14, Jazz 55, Hacker A50, 720
Wildcat 30
V-blades
11-13-2006 Over year old.
 
 
Micro-Maniac
Elite Veteran
Location: Pasco,Washington Formerly: Captain Chaos

The slider will indeed be very close to the gear box - It doesn't take much room to deflect the blades a lot - Just make sure all is centered and limited to the offset position so the slider won't actually hit and bind on the gearbox -

With the servo and linkages centered at the tail blades' offset position and you limit the gyro travel to that 1-2mm between the slider and gearbox then it will also travel 1-2mm the other direction as well and not have too uneven of deflections and piro rates each way.

(start with the gyro limit turned all the way down and in rate mode hold full rudder in the direction the slider moves towards the gearbox and turn the gyro limit up until the slider almost touches the gearbox and doesn't bind in repeated tests)

(I like the metal boom servo mounts so I can center the servo then slide the servo/mounts/linkage to the proper offset blade deflection so I have a good 90° arm/link angle with the offset deflection)
11-13-2006 Over year old.
 
 
Kristoffer
Senior Heliman
Location: Sweden

Thx for that!

Also if i look at some pictures on eric larson site i can see the tail outputsaft extending maybe 2-3 mm outside of the tail box and the tail hub. are you guys doing that also? my shaft now is exactly where the bearing is, if you understand what im saying? :-)

I just dont see why the shaft should extend from the tail shaft whats the purpous of that?

also what gain settings are you using? I run around 25 on my gy 401 it just seems to low?

2xStratus, Gy611, ATG, YS91SR, SB19
Logo 14, Jazz 55, Hacker A50, 720
Wildcat 30
V-blades
11-13-2006 Over year old.
 
 
Micro-Maniac
Elite Veteran
Location: Pasco,Washington Formerly: Captain Chaos

Sorry we all neglected to reply for so long -

The output shaft position depends on setup style and shaft lengths etc - I position my output shaft flush with the outside bearing and thread-lock it to the bearing then position the rotor on the other end of the shaft at the offset pitch position (about 8° offset pitch) with the servo arm and linkages all orthogonal (90°).

I'm not sure what the gain resolution is with the gy401 in relation to the radio - I'm running 45% according to my radio which has a range of +/-0%-150% - So if the gy401 uses the whole 0%-150% as it's 0%-100% range then 45% radio gain would be about 67% gyro gain?

(i have my linkage in the innermost hole of the servo arm - in the center hole my radio gain was about 25% also = 37% gyro gain?)
11-25-2006 Over year old.
 
 
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e-MS Composit Hornet > Hornet 2 and gy401 tail hunt!
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