Tail
First adjust the servo arm position like you did with the swash, make sure your trim and sub-trim values
are centered. Attach the servo arm so it's 90deg to the tail pushrod (vertical). Now adjust your two
plastic ball ends, for the push rod, so they are screwed on about half way onto the threaded pushrod
guide end piece. This was you have max amount of adjustment available in both direction. When this is
done cut the carbon pushrod to a length that will achieve about 3 deg of positive pith on your tail
blades, when the servo is in its neutral (vertical) position. When this is done glue the two end pieces on
to the pushrod with CA glue, don't forget to insert the pushrod guides first.
When this is done you should have 3 deg of positive tail blade pitch. Use the outer holed on the tail
blade grips for ball link attachment (on our larger machines with longer tail output shaft this is not
critical). The tail should spin counter clockwise looking at the right side of the helicopter with the nose to
your right and tail to your left. See pictures 5-8.
Throttle
The throttle cure will be affected by several conditions; some of them are, motor choice, blades choice,
elevation, temperature, muffler, helicopter weight and type of helicopter. So in order to explain this I will
explain what you are looking for. Your goal is to achieve a constant headspeed once the helicopter is
airborne. If you ad pitch (climb) you need to ad power (throttle) to compensate for the added resistance
a higher blade pitch creates. If during climb your headspeed drops, then you need to add throttle to that
particular stick position, and reversed if you have an increase in rpm. You should always have 100%
throttle when the collective (pitch) stick is moved all the way up. If during max climb out you experience
an increase in headspeed then you need to give the blades a higher pitch, do not try to adjust the max
climb rpm by reducing throttle. It need to be left at 100%, if you do not leave it there you will not be able
to achieve max power. There are other ways of achieving this by using cyclic mixing, however we will
stay away from this for now. Follow the pitch guidelines in the table above, and if you need more pitch
at max power because the rpm is increasing, then ad pitch. 10deg is just a guideline and will work in
most setups, but a powerful motor or a light helicopter might need more. For rpm adjustment during
anything other than full stick deflection you should use the throttle.
A short recap, adjust throttle to adjust rpm during anything other than full collective. At full collective
adjust the pitch. See the Throttle table for general setup.
Final words
These are guidelines and will get you going but might not be 100% accurate in regards to all
helicopters. Especially the throttle curve table should be considered initial guidelines. As mentioned
before it's greatly affected by your equipment. As you become more familiar and proficient with your
helicopter you can change the pitch and throttle curves to your liking.
