hey guys im having a bit of difficulty with my blade tracking on my belt CP, in normal mode between zero and half throttle one blade (lets call it blade A) is below the other blade (blade B)...at about half throttle the blades are relatively in track then as the throttle gets towards the top blade A rises above the blade B.

As you can see i have a dilema on my hands, how should i fix this problem, should i try keeping the blade pitch at zero and track the blades because i think the changnig pitch is affecting the tracking.

I hope i have explained enough.



Thanks, Daniel

UPDATE....
I set the pitch to zero and made it so the pitch wouldnt change as i increased the throttle. I then tried to track the blades again, the faster the blades went the more out of track they were.
This is problem number one:
At about 3/4 throttle blade A rises above blade B, so i then adjust blade A so the pitch is slightly lower (only half a turn on the pushrod, smallest change possible) but then blade A is now below blade B at about 3/4 throttle......i cannot make a smaller adjustment so no matter what i do the tracking will not be good anywhere above 3/4 throttle.

Problem 2: I set the tracking as best as i could with the pitch set to zero (described above) and then i put the heli back into normal mode and went for a quick fly but after the adjustments i had made the tracking was horrible at half throttle (which i have at +5 degrees pitch in normal mode).

Sooo. now i dont know what to do, i could set the pitch in normal mode as best as i can so at around half throttle the tracking is fairly good but if i do that as soon as i go into stunt mode the tracking is extremely bad, or i can do the opposite and set the pitch as best as i can in stunt mode but as soon as i put it into normal mode the tracking goes horrible again. Can anyone tell me what to do, as this post shows..my problem is quite complicated and hard to describe in writing but i did my best.

Thanks in advance, Daniel

I had the same problem last week on my HBK2. Had a little wobble in it. One of the nuts on the feathering shaft came loose, but not really loose enough to notice just doing a quick preflight check. The blade grips were just loose enough to make it impossible to set the tracking. I tightened up the feathering shaft and the blade tracking was still right on.

the nuts on the feathering shaft both look ok, same amount of thread exposed on each side, so what would you suggest i try, tighten or loosen the nuts...I'll try anything.

Thanks, Daniel

Have you balanced the blades and checked to see if the two blades have the center of gravity, balance point? Also check to see if the blades weight is the same.
Mike

Have you crashed it yet? if so then your feathering shaft may be bent. take your head apart. check the o-rings and the bearings. Make sure your thrust bearings are in the correct way.

I just fixed my heli that had a similar problem. i couldnt figure out what it was but i knew it was the head. tracking was always off no matter how hard i tried. took apart my head and changed the feathering shaft, o-rings, thrust bearings, and bearings and she is good as new.

The blades are balanced weight wise but i dont think they are exactly spot-on CG wise, i have had a couple of small crashes....i will take the head apart and have a look...thanks for all the help.

Thanks, Daniel

I would definitely take a close look at the feathering shaft. I bent mine after I had landed and the rotor had spun down to almost zero. It then tipped over on the skids and the blade hit the ground (again when it was on the ground and barely spinning). Had a similar issue plus a new vibration after that, but no visible damage whatsoever. Replacing the shaft fixed it.

If it does not look like it is bent (I couldn't perceive the bend in mine originally), try rolling it on a piece of glass (small mirror or a picture frame with a glass front... you don't even have to take the picture out). Roll it back and forth near eye level to see if either the middle lifts up or either of the ends. If it does, replace it.

Good luck... let us know how it turns out

yeh i took it apart and it does have a small bend in it, ive order a few more.

Thanks, Daniel

I had a Blade Cp and I would recommend getting a Align Hardened, main shaft. The stock Eskys bend bend very easy and some new ones come bent. I did this to eliminate the main shaft from a possible issue when trying to balnce the rotor disc. ANY blade strike, no matter how small, the spindle should be pulled and checked. You need a weak point in the rotor system and the spincle shaft is it. The one bad thing about the Belt is the design of the spindle shaft/grip assembly. With the blades installed, grap the the blade tip and try to move it up and down while holding the head. Any play in the grip will result in tracking movement in flight. You need the grip snug enough to keep the blade grips from moveing up and down but not so tight to cause binding in the collective. I ended up putting just a small ammount of locktight on the spindle threads insde the lock nut before I installed them, to ensure once they were snug they wouldn't loosen. the nylon lock nut is not reliable, especially if reused. When I installed them I also disconnected the pitch rod to test the binding. To ensure good tracking, a little drag is OK. What hurts the ESky grip is it only has two bearings(not counting the thrust bearings), whereas the TRex has 3. Also an tighter tolerence grip bearing would help with the shaft/grip play. Ideally you want no up and down play or you will have a wandering track to some degree. Helidirect sells a turbuckle for the Belt/King that will help in fine tuning the track. Woodies are also susceptible to different atmospheric conditions effecting the airfoil so fiberglass or carbons would remove the blades from the equation. Even on my Hawk 30, under different weather conditions my track will change slightly.

http://www.helidirect.com/product_in...oducts_id=6360

thanks, ive checked out everything and the main shaft has a tiny tiny bend in it so ill change it, the feathering shaft (is that also called a spindle??) also has a slight bend in it so ill change that and i found out yesterday that on one side, the thrust bearing was wrong, there is supposed to be two silver metal grooved pieces with different size inner diameters and the piece with all the ball bearings, both the silver grooved pieces were the small ones, i compared them to the other side (which was correct with one big and one small piece) and it was definetly missing the piece with the larger hole.

Thanks, Daniel