sandal

Sceadu 30. First heli. Has run 5 tanks of fuel.

Imagine the heli is standing on a clock with the nose pointing at 12 o'clock and the tail at 6 o'clock.

When I apply left cyclic, it tilts towards 10:30 instead of 9 o'clock. When I apply right cyclic, it tilts towards 4:30. What is wrong and how can I fix it?

swee7an

i have same problem [] , so i couldn't get it up of the ground,

i am gonna let someone with experience adjust EVERYTHING for me, and i advise you doing the same be4 your hurt urself or ur heli.

sandal

swee7an;
before I hurt myself?

The heli flies ok for normal hovering and not-too-fast forward flight, but when I give it full left/right cyclic the nose pitches up or down. It has nothing to do with being uncontrollable...

Letting other people adjust your heli doesn't teach you very much... Talking to other pilots, listening, watching and then adjusting it yourself does.

FHHuber

Could be how you are handling the sticks... ( no can't be that...)

try adjusting spring tensions on the stick so its easier to move side-side, harder to move up-down. its just a little screw to change the spring tension.


Try putting a soda strawon the stick to FORCE yourself not to use just the thumb. When you get used to it you will find you have MUCH better precision in your stick movements.

sandal

...feeling aggressive today... I appreciate your help, but it makes me feel [your favourite word here]. I'm the airplane instructor in our club, and have flown planes and raced cars since I was a kid, but I'm new to helis. Being back to square one is frustrating and difficult, but it is fascinating to learn a totally new aspect of the hobby...

The problem is simple: when I move the cyclic stick to the left, the nose pitches down. When I move the stick to the right, the nose pitches up.

Is something out of adjustment, or am I supposed to correct this by mixing in fore/aft cyclic with left/right stick inputs?

polstery

make sure you have the radio on the right setting for the swash plate . I'm not sure what that setting is for your heli or what radio you have but the setting is wrong . depending on your radio it sounds like you have it set in the 120deg mode and more than likly you need 90deg mode

sandal

The Sceadu comes with different swash plates, and I have the one with one servo controlling fore/aft and one servo controlling left/right. The Tx is set to "NORM" (Eclipse 7). Is this correct? (I guess it is, the heli would be unflyable if it was wrong. It works fine except that the cyclic inputs seem to be 30-40 degrees off)...

polstery

That seams to be correct, where does the pushrod connect on the swash plate, lets say its set up like a clock 12 being the front of the heli the servo controlling fore and aft should be at 12 or 6 , left and right should be at 3 and 9.

sandal

Servo directions seem to be correct.

I discovered something though: The upper part of the swash plate, wash-out and radius block can be turned relative to the rotor blades. According to the manual, these parts were 40 degrees off anti-clockwise (I think). I lined them up and tightened the radius block. Does this mean that the rotor was 40 deg ahead of the controls? That would explain why the nose dropped when I applied left cyclic. The heli would tilt towards 10:30.

Unfortunately it's colder today. -12C. If it sneaks above 7, I'll give it a try and see how things work.

Do you think the problem is solved?

polstery

You got it , that was going to be my next question, she'll fly fine now

sandal

Can't wait to try it!
Thanks!

wisdom-seeker

The problem you were seeing is called gyroscopic precession. This is normally corrected by having the rotors adjusted to make a change in attitude 90 degrees ahead of the desired result. Some helis have this built in to the design, and others have "phase" adjustment that must be tuned until the heli flys correctly. From the sound of it, your phase adjustment was lagging too much, causing your rotor pitch to be applied too late to move the rotor disk in the correct direction.

polstery

A little late don't you think???

swee7an

sorry sandal, i missunderstood you.

my heli does the same even at low rpm !

when i give half throttle (heli still on ground ready for take off) and give left cyclic it tilts forward to the left instead to the left. so i thought the same is with you

wisdom-seeker

It's never too late to give a full and complete explanation.
Besides I answered as soon as I saw it.

sandal

wisdom-seeker;
it wasn't too late. Understanding the physics is an important part of the hobby, IMO. Making it fly right without understanding why wouldn't be half as good

swee7an;
have you checked whether your heli has the same problem? I didn't find the problem until I tried FF and noticed that the heli was difficult to turn to one side.

sandal

IT WORKS!!!!