ChopperAddict's Hints & Tips


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   SAFETY  - A CNC (bling) parts warning !

Many of us like to add CNC (aluminium) parts to our helicopters, especially the rotor heads and tail drive assemblies, as they not only look rather nice, but they usually help the helicopter to fly better.

However, many people forget one of the most crucial things when using CNC parts, and that is that 


If you forget to do so, there is a very good, if not guaranteed chance that those screws and bolts WILL COME LOOSE.

This is because helicopters create a great many different harmonics and vibrations in all of the moving parts, and these are quite enough to start these little screws moving in the threads.

It doesn't matter how large or small they are, always ensure that they are ALL THREAD LOCKED.

To illustrate this, I personally fell into the thread lock trap recently when working on an Airwolf that had the stock Esky CNC Upgrade tail assembly.  I was working on the tail at the time, so to test it I didn't bother to threadlock the screws that hold the side plate on.  After all, I only intended to fly it for a few minutes to set the tail up.

All was well, I adjusted the tail and gyro, and then went to perform a nice prototypical approach and landing from about 20 feet up.  Luckily I was only about 6 inches off the ground when all of a sudden the helicopter started to spin frantically.  I dropped it onto the ground rapidly and hit the throttle hold switch.

It was easy to spot the problem - 3 OUT OF 4 SCREWS HAD COME RIGHT OUT AND DISAPPEARED. That in only a few minutes flying.  Had I been at 20 feet, my AirWolf would have been severely damaged.

So, don't let this happen to you - ALWAYS THREAD LOCK EVERYTHING IN CNC PARTS.

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