RunRyder - Trex 600 nitro heli osulation

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Align T-REX 600N 700N > Trex 600 nitro heli osulation

dave75d
Senior Heliman
Location: Jacksonville, FL

I just flew my new trex 600 for the first time after the build. i only have 2 tanks through the bird. the heli has a bad osulation throughout the flight. i have adjusted the throttle curve up for more head speed but it dose not change anything. have no idea what could be causing the problem. please help.

ten grand in helis and all i can do is hover

07-19-2008 11:44 PM

kingair
Key Veteran
Location: Ivins, Utah - USA

Sounds like a low headspeed and a tight new head. Try bumping up the headspeed some more or try some softer dampers. What dampers are you using? What headspeed are you at right now?

There is a very fine line between "hobby" and "mental illness."

07-19-2008 11:48 PM

HOMEPAGE

Jeff polisena
Veteran
Location: westpalmbeachflorida usa

Make sure all link rods are equal and fly bar paddles are tracked , sub trims should be the same on all three swash servos .As well as ATV's then head speed will also come into play .

I dont know how to fly just how to not crash !!!!!

07-20-2008 01:01 AM

dave75d
Senior Heliman
Location: Jacksonville, FL

I dont have a tach for the rotorhead so until i can get one i cant tach the head. the dampers are the ones that came with the nitro pro they are the black ones.

ten grand in helis and all i can do is hover

07-20-2008 01:48 AM

MMike
Elite Veteran
Location: Holland,Mi-USA

Dave

IMHO, the 600N will hover nicely at 6 to 7 degrees pitch.

If you're hovering at 6 to 7 degrees,

your head speed should be around 1,500.

This is a way to get you in the ball park.

07-20-2008 02:35 AM

HOMEPAGE

mchammer
Veteran
Location: California,USA

are your blades tracking good???
Engine running too rich??

Peace Through Superior Firepower!!!

07-20-2008 08:07 AM

peekay
Heliman
Location: melbourne au

did you lube the head dampers ?

07-20-2008 12:24 PM

tukkus
Heliman
Location: ma

I just figured out what my problem was with my Trex 600. I'm not sure whether to call it an osculation or a vibration but what i found was that my belt was too loose for one and two the grips had some slop in them on the hub. I tightened the belt up and that made most of the wag/vibration/osculation go away but there was some still left, then I checked the grips, noticed some slop and replaced them with Quick UK grips and now there's no movement in the tail except when I want it.

I'm not sure what happened but my first 10 flights had no wag/vibration/osculation in it then it slowly got worse, I'm thinking that I didn't have the belt tight enough and maybe that caused the grips to wear prematurely but I'm new to helis so I'm just guessing at this point.

At least my heli is ready to fly again so I'm happy : )

07-20-2008 01:50 PM

Jeff polisena
Veteran
Location: westpalmbeachflorida usa

Everything just settled in

I dont know how to fly just how to not crash !!!!!

07-20-2008 08:31 PM

dave75d
Senior Heliman
Location: Jacksonville, FL

It Quit

thanks guys. after 2 more tanks, and hopping the headspeed up 10%, all vibes quit. borrowed a friends tach to set hover speed at 1850 mid stick. runs like a champ. thanks again

ten grand in helis and all i can do is hover

07-21-2008 11:03 PM

MMike
Elite Veteran
Location: Holland,Mi-USA

What's the max safe head speed?

Do you have it programmed for the throttle go up from mid stick?

07-21-2008 11:14 PM

HOMEPAGE

brcg123
Senior Heliman
Location: Wagoner OK USA

MMike, I think you have some bad information, but, I think all helicopters come off the ground at 5 degrees of pitch, not 6 to 7. especially the trex 600 with the weight being what it is to the power ratio.

Bruce

07-21-2008 11:26 PM

MMike
Elite Veteran
Location: Holland,Mi-USA

I'm no expert. I'm happy to learn here.

Head speed and pitch work together.

Depending on speed, you could lift off at 5 ,6 , or 7.

Right?

07-21-2008 11:30 PM

HOMEPAGE

brcg123
Senior Heliman
Location: Wagoner OK USA

no, no matter what the head spead, at 5 degrees, your gonna lift off. the head spead will tell whats gonna happen at that point. If its high enough, the head spead will make your tail respond well with everything, but if too low, it will wiggle, and the heli will not respond well. thats why you want 5 degrees at 1/4 and 3/4 stick, with 0 in the middle. it's predictable whats gonna happen.

Bruce

07-21-2008 11:46 PM

TulOkFly
Senior Heliman
Location: Tulsa. OK - USA

MMike,
You are correct in that headspeed and pitch are linked as far as which pitch (that sounds funny

) the heli will hover at. The higher the rpms the less pitch needed and vice-versa. In general it is somewhere around 5 degrees though.
To state that it is always exactly 5 degrees though is not correct.
All that really matters is (for idle-up) you have 0 at mid stick and enough pitch to get the climb rates you want at the extremes without bogging the motor. Exact numbers for everything are virtually impossible to predict from the bench. Pitch guages will just help to get the heli to where it will fly, then flight testing and adjustment will fine tune.

Just Fly!!!
TRex 450
Blade 400
MX450XS (parts machine now)

07-21-2008 11:53 PM

brcg123
Senior Heliman
Location: Wagoner OK USA

in fact, if your running your pitch window at +12-12, and 0 at center stick, and set the pitch up lenier from 0-50-100, you will actually lift off before 3/4 stick. where ever you have 5 degrees of pitch you will lift off. with +10 -10 set up, you will have 5 degrees at 3/4 stick with a lenear pitch curve of 0-50-100, and you will lift off at 3/4 stick

Bruce

07-22-2008 12:00 AM

MMike
Elite Veteran
Location: Holland,Mi-USA

Interesting stuff.

07-22-2008 12:04 AM

HOMEPAGE

brcg123
Senior Heliman
Location: Wagoner OK USA

Tulokfly, you mean to tell me that if i have 4 degrees pitch at 3/4 stick, and with a head spead of 1500, i wont lift off at 3/4 stick, but if i change just the head spead up to 2000, it will now come off the ground at 3/4 stick?

Bruce

07-22-2008 12:05 AM

brcg123
Senior Heliman
Location: Wagoner OK USA

no, i dont think it will. you need at least 5 degrees of pitch to lift off, reguardless where it is at on the curve. I could be wrong about what head spead you have to be at, but, the pitch is correct. it wont lift off the ground at 4 degrees of pitch, even with 2000 headspead.

Bruce

07-22-2008 12:20 AM

TulOkFly
Senior Heliman
Location: Tulsa. OK - USA

brcg123, The lift an airfoil produces is dependent on the velocity of the airfoil through the air as well as the angle of attack(pitch). It is a combination of both. More pitch gives the same lift at lower rpm as less pitch at higher rpm.
That is why in scale airplanes there is a trim wheel for the elevator. As you slow down or speed up the aircraft will tend to climb or descend due to the change in lift and that has to be compensated for with the elevator trim. The wing shape stays the same so velocity is the determining factor.
You could hover at 0 degrees (since the blade has an airfoil shape and if it was a semi-symmetrical blade) if the rpms were high enough... of course that would be extremely high.

Another example... when on approach in an airplane and flying very slowly the nose must be up (higher angle of attack, lower airspeed) to stay flying.

Just Fly!!!
TRex 450
Blade 400
MX450XS (parts machine now)

07-22-2008 12:41 AM

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Align T-REX 600N 700N > Trex 600 nitro heli osulation

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