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HomeAircraftHelicopterHelicopter Main Discussion › Shooting baby auto's
04-24-2009 01:46 PM  9 years agoPost 1
T-Rex-Flyer

rrElite Veteran

Panama City, Fl

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Just starting to work on auto's, when I hit the throttle hold switch my Raptors tail moves to the left about 45 deg., maybe less. It doesn't effect my orientation but is this normal? If not how do I correct it?

My setup.

Raptor Titan
Maverick G5 Pro's 620
OS 50 hyper
Head-speed 1800 rpm
Futaba 401 w/s9254
Futaba 10c

If the wings are traveling faster than the fuselage, it's probably a helicopter.

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04-24-2009 02:12 PM  9 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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No, make sure you don't have any rudder trim in heading hold mode, and make sure the gyro is staying in heading hold when you hit TH

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

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04-24-2009 02:23 PM  9 years agoPost 3
Flying Brian

rrElite Veteran

St. Clairsville, Ohio

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Are the 401's prone to jumping out of HH once you switch to TH?

Also, I don't understand the ato-rotation gear, as it's my understanding, that som helis come with auot secondary rotation gears that tun 360, and other don't, or Am I just miss understanding the whole concept of the definition of a autorotation gear?

"I just don't Listen" "

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04-24-2009 02:24 PM  9 years agoPost 4
T-Rex-Flyer

rrElite Veteran

Panama City, Fl

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I know there's not any ruder trim, and will double check the gyro setting in throttle hold when I get home this evening.

Hay Brian not sure what you're talking about here, if you're referring to Driven and not-driven tail rotor system. The Raptor 50 Titan has a driven tail.

If the wings are traveling faster than the fuselage, it's probably a helicopter.

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04-24-2009 02:34 PM  9 years agoPost 5
jschenck

rrProfessor

La Vista, NE.

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As BH said earlier, what is your gain in throttle hold mode?

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04-24-2009 02:37 PM  9 years agoPost 6
TOSH

rrElite Veteran

UK.Peterborough

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Hi Brian
Am I just miss understanding the whole concept
Easy answer is yes but dont worry, your MT has a driven tail and you will still have controll of it tail in autos. Some thing like the Logo 10 does not have a driven tail so the tail blades will stop in an auto and the tail will follow the nose.

Flybars. Who needs `em.

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04-24-2009 02:38 PM  9 years agoPost 7
Hamo

rrVeteran

Ireland

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Are the 401's prone to jumping out of HH once you switch to TH?
Not normally, unless you program your transmitter to set the gyro to normal mode in TH.
Hamo

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04-24-2009 02:56 PM  9 years agoPost 8
rotormonkey

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Ottawa, ON - Canada

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I'd think it's probably just over-compensating when the motor's torque suddenly disappears.

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04-24-2009 03:00 PM  9 years agoPost 9
TOSH

rrElite Veteran

UK.Peterborough

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Try it on the bench. See if the servo twitches.

Flybars. Who needs `em.

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04-24-2009 03:03 PM  9 years agoPost 10
JimmyC

rrApprentice

Gaithersburg, Maryland USA

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Not sure if it would make the tail move, but may be different pitch settings when hitting throttle hold.

JimmyC

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04-24-2009 04:19 PM  9 years agoPost 11
HydroJoe

rrApprentice

SF,CA

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Not sure if it would make the tail move, but may be different pitch settings when hitting throttle hold.
I think you might be on to something.

Are your pitch curves equal. I use a linear PC on TH so it always matches my flying curves. I know some dont like to run full neg in TH, but it might be a good place to start for troubleshooting.

T-Rex 450 SE V2 , T-Rex 600 NSP, Stryker F27 C....Yea, it's a plank.

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04-24-2009 04:48 PM  9 years agoPost 12
holzback

rrKey Veteran

noblesville IN United States

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i had a g7000t on a vigor that did this, i had to hold a litle rudder to keep it straight. this was from doing autos backwards, it seemed once all the power and rotor speed was gone the gyro lost its power to control the tail. example, when you try to lift the heli off the deck before it is spooled up good and it torques around. once there is good rotor speed it is fine though.

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04-24-2009 05:14 PM  9 years agoPost 13
VooDooX

rrElite Veteran

San Francisco Bay Area CA, US (San Mateo)

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are you hitting thold at 0 Deg pitch or full pitch? if not at 0Deg try them with the throttle centered and see what happens also on the ground flip thold on and off and see if there's any movement at all stick positions if there is then your pitch curves aren't aligned and this will cause that

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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04-24-2009 05:28 PM  9 years agoPost 14
JetFire

rrKey Veteran

The Golden STATE

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Check your Th-hold settings guys on your TX. Not familiar with all brand radios but I know on my Futaba... you can control and setup hold behavior similar to any other mode.


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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04-24-2009 06:01 PM  9 years agoPost 15
T-Rex-Flyer

rrElite Veteran

Panama City, Fl

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To answer some of the question so far.

These are hovering auto, at about 3-5 feet, pitch would be about five to five and a half degrees.

Pitch curve between normal and throttle-hold are identical.

It seem like when the torque is removed for the rotor blades the gyro take a split second to respond.

EDIT:

Just learning and won't do them from altitude just yet... well not unless I have too.

If the wings are traveling faster than the fuselage, it's probably a helicopter.

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04-24-2009 06:18 PM  9 years agoPost 16
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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I maintain that is exactly what is happening. My heli does that too. Even with a spartan on it. Gyro just takes a second to react properly to the loss of torque, then everything's good again. When you're shooting one from up high and you have any kind of forward movement, it won't happen right? Just when you're hovering?

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04-24-2009 06:24 PM  9 years agoPost 17
TJinGuy

rrProfessor

Socorro, NM - USA

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I have a Raptor 30 with a 401 and the driven tail upgrade. If I grab th.hold while hovering 3ft up then the tail moves about 3-6in CCW and then holds. If I auto with forward speed then that is reduced. My guess is that either he does not have the driven tail or he has a radio issue like loosing HH in th.hold.

- Chris

Team New Mexico
TJinTech

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04-24-2009 06:37 PM  9 years agoPost 18
Swoop

rrElite Veteran

Newark, DE USA

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I
'd think it's probably just over-compensating when the motor's torque suddenly disappears
I think this is exactly what is happening. May swing more or less depending on how much gain your running. All of my helis do this, some a little more than others.

45 degrees sounds a bit much so maybe your tail is not set up perfectly.

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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04-24-2009 08:11 PM  9 years agoPost 19
BarracudaHockey

rrMaster

Jacksonville FL

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Weird, I can TH on all my models in a hover and they stay put.

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

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04-24-2009 08:50 PM  9 years agoPost 20
HydroJoe

rrApprentice

SF,CA

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I maintain that is exactly what is happening. My heli does that too. Even with a spartan on it. Gyro just takes a second to react properly to the loss of torque, then everything's good again. When you're shooting one from up high and you have any kind of forward movement, it won't happen right? Just when you're hovering?
Thats odd, I do "baby autos" all the time (as well as high autos).....Mine does not do it at all (w/ a 611.) It might kick a hair but definatly not 45 deg.

T-Rex 450 SE V2 , T-Rex 600 NSP, Stryker F27 C....Yea, it's a plank.

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