Malcolm Smith 9

Hi Jeff/Colin. Thank you for your replies. The handbook is the same as i have for the helicopter. Colin you have just put your finger on the problem. I have had a close look at the assembly detail in the manual and see that the part identified as 030 has not been installed. The part does not have the grub screw provision and therefore the problem has existed from the original purchase of the helicopter. I spoke to my son today who owns the helicopter who told me he never actually managed to fly it. Now we know why. I have ordered two collars and see what happens when they arrive. Thanks again for your help. Stay safe.

H Jeff Its the small rotor which sits directly under the main blades which shoots out to one side. If I prevent the sideways movement by using an elastic band the vibration goes away. I cant find a way to add a picture of the issue Are you aware of any members living in the Ashford Kent area who perhaps I could go and see?

Thank you all for your replies. I have had the helicopter in my workshop and spent a lot of time looking at the control functions servo and all appears OK. I moved the the rear drive shaft clear of the main cog and found that even with this disconnected there was still the massive vibration. However when the rotation stopped I noticed that the smaller rotor was sitting out towards one side and not central as I thought it should be. It therefore seems that this is the cause of the out of balance. All the links are in place and there is free and full movement of all parts. Any thoughts please.

I have been given a Art Tech Mini Pred v2.4G helicopter and although there was a few things wrong with it I have managed to get it running and the control functions seem to be working normal. There is however quite a lot of vibration when held down on a table with somewhat less when it is hand held. I have a set of new blades but the vibration is just the same. Can anyone please let me know if this is normal before I commence flying trials?