ChopperAddict's Hints & Tips

CHOPPERADDICT SPECIALISES IN THE BUILDING, REPAIRING & 
SETTING UP OF R/C HELICOPTERS AND RADIOS

   

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Tips & Tricks - How to make your Co-Ax heli fly as smoothly as possible

This page is dedicated to the KOB, Llama, Co-Comanche etc fliers out there.

All of these small coax helicopters tend to vibrate quite a lot, and this vibration really can  upset their flying capabilities quite dramatically.

Coax helicopters are best at hovering, and they will do this almost hands off once set up correctly.  It is therefore essential to ensure that your Coax is setup correctly. 

The first and most obvious thing is a bent mainshaft.  These MUST be changed.

The next thing is to only just pinch the blades when fitting them so that they are really nice and free to swing on their bolts.  If you tighten these even a little too much, you will find you will have vibrations.

Check that the settings on the gyro are correct so that you do not have to correct the tail in a steady hover.  Having to trim them or hold tail correction on will take quite a bit of power from the motors.  It really is worth spending some time on this.  The best time to do it is when the battery is about half used.

Replace blades with broken tips.  Get some carbon fibre blades, they are almost indestructible.

Sounds silly, but try to balance the blades overall weight as a pair if possible.

TO ENHANCE HANDLING PERFORMANCE

Buy the CNC upgrade for the flybar holder.  This holds the flybar securely, and has a cap on top so when you crash, it will not keep popping out, which soon results in a worn plastic connector.

Get the CNC Swash plate, it is miles better than the plastic one.

The best modification here is to get (or make) and extended inner mainshaft (the one to the very top set of blades). You can add about 4 inches to the stock length quite safely. What this does is gives a bigger differential between the two sets of contra rotating blades, and this will let you get more response from ALL cyclic inputs.  There are some after market components to hold the top rotor hub up, but I find that some electrical tape around the shaft immediately above the bearing works just fine and for quite a long time without wearing out.

If possible on your helicopter, and especially when it has a CNC swash, move the connecting rod to the outmost servo horn hole to get more movement from the swash plate.

Bend the flybar upwards about 1 inch from the centre hub. Bend it to an angle of about 20 degrees upwards or slightly more. This provides better control as the flybar is a little less effective at holding the top blades level.

You can also cut away some of the tip weight on the flybar as well.

Update the motors to the Extreme versions, these are quite a bit more powerful

HAPPY COAX FLYING