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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › I know this is a newbie question, but...
08-20-2008 08:40 PM  12 years ago
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gilliraldi

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Epsom, NH

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I know this is a newbie question, but...
I have a gohbee 50 stinger with OS max engine, high torque Hitec servos, and GY401 with 9254 servo. I just put the kit together and I was spooling it up yesterday a bit just enough to rev the engine a bit from idle, and I noticed that as I move the roll stick to the left, the heli seemed to tilt left AND to the back. This might just be due to the fact that the rotor blades were not up to hovering RPM yet, but it does worry me a bit. I set up everything (pushrods are all set up according to the manual), so I am not sure what this could be. Does anyone have any suggestions?
Hello, Peter. What's happening? We need to talk about your TPS reports
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08-20-2008 08:51 PM  12 years ago
jsenicka

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Eagle River, WI

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Does the swash only tilt left when you input this stick motion or does it tilt back?
The heli goes where the swash points once you are up to flight RPM. I think you are just seeing oddness from low rotor speed.
Jim Senicka
Team Manager, GrandRC Flight Team
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08-20-2008 08:53 PM  12 years ago
gilliraldi

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Epsom, NH

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Thanks for the reply - the swash just tilts to the left, not to the back. I was thinking it is just an oddity, but I just thought I would ask. Thanks again.Hello, Peter. What's happening? We need to talk about your TPS reports
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08-20-2008 08:57 PM  12 years ago
Ghostrider

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San Diego, CA

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Test on the bench, not in the air.

Your swash should tilt forward when you push your right stick up. It should tilt left when you move your right stick left. It should tilt right when you move your right stick right. It should tilt back when you pull your right stick down.

Left stick. Push up and the entire swash should move straight up. Pull down on the left stick and the entire swash should move down.

If you have any deviation from the above, do not fly the heli! Get some help or get back on line and post your results. I will walk you through it if need be.
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08-20-2008 09:22 PM  12 years ago
Frank Bostwick

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Cincinnati Ohio

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Its best to be sure. Really sure.RIP ROMAN
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08-20-2008 09:29 PM  12 years ago
shawmcky

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Isle of Wight,United Kingdom

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gilliraldi
It might be a good idea to check the centre of gravity of your heli as well,make sure it is slightly nose heavy.If it is not it will have a tendency to move backwards as well.You may have to compensate the movement by adjusting the swash with your trims to start with.
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08-21-2008 12:56 AM  12 years ago
Raptor Pilot

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Northern Ireland U.K

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Gyroscopic precession i think is what your seeing. The blades act 90 degrees before the direction you want to go but the heli still goes the way you want it. Either that or you have something not built right. I know that when i check my controls before lift off that if i give left cyclic the rotor disc tilts left and back. This is on a clockwise rotating head.If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!
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08-21-2008 01:13 AM  12 years ago
llamont

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California

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I know this is a newbie question, but...

I have a gohbee 50 stinger with OS max engine, high torque Hitec servos, and GY401 with 9254 servo. I just put the kit together and I was spooling it up yesterday a bit just enough to rev the engine a bit from idle, and I noticed that as I move the roll stick to the left, the heli seemed to tilt left AND to the back. This might just be due to the fact that the rotor blades were not up to hovering RPM yet, but it does worry me a bit. I set up everything (pushrods are all set up according to the manual), so I am not sure what this could be. Does anyone have any suggestions?

Hello, Peter. What's happening? We need to talk about your TPS reports
Hello:

Do you have any experienced helicopter gals/guys in your locale (i.e, hobbyshop, flying field, etc...)? If so, then I would take the helicopter to an experienced hobbyist so that they may look over your work and inspect the machine for any (potential) issues. Although these forums are great for verbal feedback, it's always better (and safer) to have an experienced set of hands available to assist you in applying the feedback. Good luck and safe flying.

Loren
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08-21-2008 01:51 AM  12 years ago
Cambo

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Phoenix, Arizona

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Gyroscopic precession i think is what your seeing. The blades act 90 degrees before the direction you want to go but the heli still goes the way you want it. Either that or you have something not built right. I know that when i check my controls before lift off that if i give left cyclic the rotor disc tilts left and back. This is on a clockwise rotating head.
I second that. I have noticed this on a few helis. Never affected them in flight.

Cameron
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08-21-2008 02:43 AM  12 years ago
Ray Fernandez

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Guam (U.S.A.)

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I'm with Loren on this. If you are a "newbie", get some assistance from an experience R/C heli pilot. It'll save you alot of grieving. Ray Fernandez - GUAM
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08-21-2008 10:32 AM  12 years ago
shawmcky

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Isle of Wight,United Kingdom

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Newbie question
If you can get some advice from an experienced flyer it is without doubt the way to go.An experienced heli pilot will "feel"a fault before the heli gets off the ground.Good advice there.
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08-21-2008 01:51 PM  12 years ago
BarracudaHockey

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Jacksonville FL

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Precession only effects the control input to the disk and the disks response to it, if the disk tilts left the helicopter will move left.

Sure sounds to me like your swashplate is out of phase. I've never messed with an airskipper but line up your flybar with the outer swashplate balls and sight straight down the main shaft, the inner balls should line up with the outter ones or be mighty close. If they dont you have something put together wrong.
Andy
AMA 77227
http://www.jaxrc.com
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08-21-2008 02:16 PM  12 years ago
Swoop

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Newark, DE USA

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The stinger does have an adjustable phasing ring, so make sure its at least close. Either use BH's method or align the blades with the boom and then check to see that the inner balls line up exactly with the outer balls of the swash. If not loosen the phasing ring and adjust until it does.

I have seen what your describing and the phasing was perfect and it flew fine. It was just an appearance which did not affect in-flight control.
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08-21-2008 02:24 PM  12 years ago
BrunoBL

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Pomerode, SC, Brazil -26.71, -49.17

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I have seen this before.
A couple of years ago, just after completing my Spectra build, I started the engine and set it just above a high-idle for the first minutes of break-in. I was eager to start checking things out, so I gave some cyclic input.

I recall that there seemed to be some interaction between left/right and front/back cyclic, just like the OP describes, at such low RPM. I was initially worried but thought it might be the low RPM, so I spooled up a bit more and the effect went away. I hovered the Spectra on that same day with no ill effects, and I never thought about it again. The heli flies great, is smooth and responsive, in those two years I never had to mess with the head in any way.

I'd recommend to the OP that first he get local assistance if possible, and also gradually increase headspeed on the ground while checking cyclic commands (stay at a safe distance, please). If the interaction does not disappear before approaching normal hovering RPM, then there is a problem.

...Bruno.
Spectra G on Avgas 100LL, Jewel generator
T-Rex450SE V2
DX7
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