HBFP rotor problem

[Five-oh-Joe]

Hello all, first I'm new here (and new to helis, so please bear with me). I'm not new to RC in general though. I've been into the car side of things for quite a while, and run brushless gear in all of my offroads and onroads along with lipo. So, I am no stranger to electric equipment. When things start flying though....then I'm a newb!

Anyways, I'm having an issue. I was checking the blade tracking of my HBFP yesterday, and noticed that once I got the blades up to speed and checked the tracking (looked ok and level; may need a little more adjustment though).

After that I was checking out all the controls to make sure the rotor head went where it was supposed to in regards to stick input. Right stick forward ended up making the rotor head tilt forward, as I expected, but it also had a tendency to tilt left as well, which I found odd. So the heli, if I were to fly it right now, would probably go forward and left if I were to input a simple forward stick movement. Could this be a flybar adjustment issue, blade issue, or swashplate not being trimmed properly?

Can someone help me out in adjusting the heli to correct this? All the parts are fine, and have been replaced or inspected for damage since I kinda sorta maybe hit a tree last time out (and have since then rebuilt most of the heli so that every single piece is perfect again...:o

Any input is greatly appreciated!

[Mike SVOR]

This falls into the topic of gyroscopic percession.
More head speed will stop the heli from tilting. It won't do that in flight.

[Five-oh-Joe]

Thank you for the information. You wouldn't happen to have a link or be able to point me in the right direction so I can read up on this phenomenon would you?

I assume it deals with gyroscopic effect of a body in rotational motion (momentum, inertia, and all the crap I already forgot from physics last semester....:YeaBaby:).

So...to recap, you're saying that in flight, it will not do what I obeserved the rotor head doing then? Thanks!

[kodak_jack]

If you power up the heli, but don't spin the blades, you can work the servos and see what the effects are. Forward and backward stick movement should produce movement in the flybar paddles. Left and right will show in the swash plate without the rotor spinning. After your servos initialize, the swash plate should be sitting flat. If it isn't, you can pop off the link on the side not sitting flat and do 1/2 turn adjustments to get it flat. This should also give you the servo arm being at 3 o'clock or close to it. When it comes to lift off, the heli will naturally want to go left. This is normal and varies with speed. The slower you lift off, the more it will want to go hard left. If you come up quickly, the effect won't be as great.

[antennahead]

I'm pretty new with mine also and have been having problems sorting mine out but I have it pretty close now. I had a simmilar problem, everytime I would give it forward input the heli would go forward and to the right, I checked everything and at first couldn't find the problem, then one day while checking a servo (without having the blades turning) I found that when I gave it forward input the swashplate antirotation pin would bind at the end of it's travel in the anti rotation guide, the guide would flex, but since the swash couldn't move any more, and the servo was trying to drive it farther, the antirotation guide would bend over a bit causing the heli to tilt to the right, to solve the problem ,I adjusted the servo link until it wouldn't bind, and then leveled the swash with the other link. I dought this is your problem, but worth a look.

[Mike SVOR]

If you power up the heli, but don't spin the blades, you can work the servos and see what the effects are. Forward and backward stick movement should produce movement in the flybar paddles. Left and right will show in the swash plate without the rotor spinning. After your servos initialize, the swash plate should be sitting flat. If it isn't, you can pop off the link on the side not sitting flat and do 1/2 turn adjustments to get it flat. This should also give you the servo arm being at 3 o'clock or close to it. When it comes to lift off, the heli will naturally want to go left. This is normal and varies with speed. The slower you lift off, the more it will want to go hard left. If you come up quickly, the effect won't be as great.


WUT???


I don't think you said a single thing correct here.

[Mike SVOR]

Thank you for the information. You wouldn't happen to have a link or be able to point me in the right direction so I can read up on this phenomenon would you?

I assume it deals with gyroscopic effect of a body in rotational motion (momentum, inertia, and all the crap I already forgot from physics last semester....:YeaBaby:).

So...to recap, you're saying that in flight, it will not do what I obeserved the rotor head doing then? Thanks!

I'll check for a link.....

I can't say it won't 'ever' tilt in flight, cause it does happen on a fixed pitch heli upon some wind conditions. Sometimes you have to lower head speed down so low that this does happen. It's simple to correct with stick. Be the pilot. Be ready for it and correct it when it happens.

[Five-oh-Joe]

Thank you for all the advice. I do realize it goes insane in the wind, so I try to fly at around dusk when there's very very little wind (if any), or in the middle of the night when it's dead calm.

Still waiting for my super skids to arrive, along with a few other bits so I can get this thing flying again!:thumbup:

[Mike SVOR]

well, I'm against super skids due to weight and reported flight 'issues' from users that own them.
I'd just buy some carbon fiber rod for 5 bucks and make your own landing gear like I did.

Do me a favor and check your servos to make sure they aren't stripped. Apply some minor resistance to each one and make sure they move under the resistance.

Did you crash this heli?

[Five-oh-Joe]

Servos aren't stripped; I've seen quite a few stripped servos from RC cars, and know that these are not stripped. I have also tried applying minor resistance and stuff to them, so I can defintely for sure say they're fine.

The superskids I got because the stock landing gear breaks far too often. I made several of my own pairs of landing gear, but the result was the same. I kept breaking landing gear almost all the time no matter what designs I tried. The way the stock gear mounts is not very newb friendly for crashes. Sometimes the landing gear would break for the dumbest reasons too. If it landed a little too hard (but still a good, even landing) then I'd get a freak breakage. Go figure.

Of course this heli has been crashed. It is my first one, and I am definitely still learning. After every crash, I go over all the parts to make sure everything is fine and not damaged though. I also fix anything that's damaged so I'm not flying a damaged heli (and thus, smack into things causing more damage).

I haven't been able to get it up in the air because I have no landing gear, and the super skids still haven't come. Hopefully they come tomorrow so I can get back to flying..:Bang

[Five-oh-Joe]

Well, installed my superskids and aluminum paddle bar frame tonight. It's been raining all day, so no time to fly the thing. Hopefully tomorrow I can get a few minutes in before I go to my bro's BBQ for memorial day. I may try to increase the timing on the motor as well to get some more head speed out of the chopper, but we'll see how ambitious I get..lol.

[Twmaster]

You might need to go up one tooth on your pinion if you need more head speed. The stock pinion is 10T IIRC.