Please note all of these pictures are copyrighted and to use them on another website is theft, permission must be obtained.
The pictures above and below show the servo horns when I first recieved my helicopter as it was RTF? I like many others expected it to at least hover! but it would not so after crashing I decided to strip it down and set it up to give a starting point for final tuning.so here goes:-
The servo horns No 4 on the picture above are moved to the same attitude as the servo horn No3 on picture below this is just under 90 degrees but the splines won't allow perfect 90 degree alignment( this will come under the fine tuning later).
Next :- In the picture below I set up the servo to swash plate links No2 to 26mm long(center of ball link to centre of ball link) (this sets the swash plate travel to mid point) the total travel of the collective is only 6 mm therefore when in normal flight the swash plate only moves up from mid point to top of travel(when in idle up mode the plate moves the whole 6mm but gives negitive pitch from mid point to bottom of travel to give inverted flight).
The links No1 are the swash plate to rotor pitch links these I set to 47mm long(center of ball link to center of ball link).
these 2 steps gave me the starting point to make the next adjustments described below.
last but not least
Now for the first part of my tuning.
I put on the training gear and
spun up the rotors to see what happened in this case it was at 3 quaters power before it started to lift so using the link No1 below I turned both links out (increase length which increases the +pitch) by the same amount (3 full turns on my heli)
but only half a turn at a time then span up again to see where it lifted in relation to the throttle position.
I carried on until I had lift at half throttle(as i said mine was 3 full turns)
REMEMBER TO TURN BOTH THE SAME AMOUNT).
next I spun up and noted wich way the heli wandered with right stick center and a little higher RPM.
If it wanders right the swash plate.the swash plate needs to be adjusted by (looking tail in) shortening the link No2 on the left hand side by half a turn and increasing the link on the right hand side by half a turn.
spin up again and note the way the heli wanders again, repeat these steps until the wander reverses then turn the last link you made the adjustment to back by half a turn. When you spin up now there will be none or very little wander left or right.
Now to complete the swash plate set up:- spin up and as befor with centre stick (right hand) see which way it travels eg forward or backward.
If it travels forward increase the link N02 just behind the main motor half a turn at a time spinning up between each adjustment until it holds steady or just starts to inch backward.(i have left mine with a slight backward travel as I find it easier to lift off to a hover).
This ensures that the swash plate is now level (well as near as you will get it with the links anyway).
The last thing to complete this set up is to track the blades (ensure they run in the same space when spinnind).
to do this weight down your skids to prevent your heli from flying off.i felttipped the last 20mm of one rotor in black marker.
Now look horizontally accross the rotors and (keeping back) spin up to 2 thirds + throttle if the blades need tracking you will see one blade lower than the other.
Note wich one is lower and power down now (say its the blacked out rotor blade running high) increase the length of the link No1 pictured below one turn at a time and repeat until the blades are running together.
Remove your weights and spin up your heli should with training gear lift off the ground just about half throttle or a little more if it goes befor this setting reduce the two links No1 below the same ammount until you get lift at half throttle.
Now if you give it more RPM you should lift into the air and hover with very little or no corrections.
Fine tune any drift you may have using the trim sliders on the transmitter using the same method as above ie hover and center the right stick see which way it move and land. then adjust the trim to counteract the movement. continue until you have a good hover with little corrections and that concludes my set up for the honeybee cp2.
Well thanks for reading this and good flying to all.
geoff
