Me and my buddy were out practicing hovering (both of us with training gear on) and his heli starts the hover nice and smooth, within seconds and more throttle the heli starts to shake very violently and he kills the throttle immediately becuase its a very out-of-control shake, any ideas? training gear is needed due to the fact we are both newbies, thx for help in advance.

That's very typical of training gear. At a certain RPM and and head speed the gear starts a resonate oscillation. Try raising or lowering the headspeed some and see if you can find a speed where it goes away.

Some also cut some of the length off the training gear legs to help with that too. But, I've usually found that changing the speed will solve the problem.

hmmm..ok will try that, thx.

Are you sure the engine is not to lean?

Well we closed the needle valve and opened it 1 3/4 turns, so its been left at that setting, should we try richening it a bit?

How does the engine sound does it make like a crackle sound or a 4- cycle sound?

I am learning too and my nexus was doing exactly the same vibration, so I asked a friend that flies helis and he told me that my main rotor blades were too loose, I should tight them a little more, because when I advance throtle (and pitch) one of the blades could be a little late, and could be a source of vibrations.

I think it worked for me, it never shaked so hardly again.
Say something.

it makes a 4 - cycle sound I believe, runs at low idle pretty smooth. Speaking of I'm breaking in my new .32 and it makes alot of crackle noise and shuts off alot, barely stays running and takes along time to warm up, I have it also 1 3/4 turns open from close, is this normal with new heli engines?

It may be to rich, a rich engine will not run very smooth and you said it hover's it's good until you advance the throttle. Try 1 1/2 tuns out. What fuel are you using and nitro content?

Are the main blades tracking properly? and are they balanced?
Just more ideas....

Nitro content is 15%, 18% oil content I believe, forgot the name of the fuel, think its wildcat. I'll try the 1 1/2 turn open, should this appy to my engine as well, I have alot of crackling noise and it shuts off on it own even when I advance the throttle, after this battle for 10 min. it starts to act a bit better but still has alot of crackling noise & hesistation.

Heli_fear, did the vibartion go away when you tightened up the blades? I am have experienced the exact same thing and now that I think of it, my blades do seem a little loose. I will tighten them and try it again this weekend.

Hibbitz

Well the issue with the shakes is on my friends heli, we'll be back in the air this Sunday and will find out for sure, will post then the results.

Thanks for the reply and I will be interested to know what happens. I am heading back out with my Nexus this afternoon and I think loose blades might be PART of my problem. I will let you know if it helps at all.

Thanks,
HIBBITZ

Cool thx, glad to see many of us here help each other out, any info is always helpful, I'll be doing some test hovering today since I think I have my issue resolved, I'll see. My piezo gyro seems to activate with any little vibration, not sure if its due to not enough padding but I'll find out today.

I went to test hover yesterday and had some problems with my tail rotor. Just got the Nexus and it is my first heli. The black pitch arm stripped off of the brass sleeve that goes over the tail rotor shaft (If that makes any sense). I have ordered some replacement parts from Tower Hobbies and it seem that they now have a nut that hold those two together. Before I did lift off and start spinning around and around, there did seem to be a lot less vibration so we will have to wait and see. Let me know how you and your buddy make out. If you want to email me directly I am at [email protected]

Regards,

Kent