What are reasons to cause this. It dips nose down during hover than quickly back again. Almost like interference. Very hard to deal with pain in the butt. Could crash if I didn't have lightning like reflexes! JOKE! Thanks Ron

Darticus,

Almost sounds like the front servo may be going out on ya. Normally, interference won't cause exactly the same symtom evertime. Interference will cause all kinds of weird or erratic conditions of the heli.

Hope this at least give ya a starting point,

Dave / Choppersrule
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Is there a good way to check this without spending more money. What if I just power up without throttle, leave on the floor and watch? Will it flicker? Ron

Darticus,

See attached picture. Just use something to weigh it down, I use a crowbar thru the skids. Taking the blades of is suggested.
That way you can run the main motor up and watch everything. Move the right stick in all directions and watch for something peculiar to happen. Move throttle stick up and down too.

Dave / Choppersrule

Got it but I gotta watch the skids will pull off the stock CP PRO. Thanks Ron

It shouldn't be a problem, the skids are angled into the main frame. But, be carefull and move the throttle slowly. In bench testing, like this, I always wear safety glasses/goggles. Even the Pro can cause some serious bodily damage.

I am presently having the same kind of issue. I think I've pretty much figured that mine is a bad servo. The servo on the rear right side from tail in twitches in flight. At first I thought it was interference, but then I disconnected the motor and it would still do it, so I swaped that servo, which I think is channel two if I remember off the top of my head, and i switched it with servo one. The servo in the rear right position would still twitch even though it was plugged into a different channel. That's how I figured it wasn't the receiver or interference, but is most likely the servo. Tower has a deal where you can get 3 hs55's for 31 bucks, I'm gona see if my hobby shop will match this and see if I can't get some servo's or something.

I don't really understand it though, because I have only crashed my chopper 2 times. the first one resulted in a boom strike and a bent spindle, and the second one just resulted in a broken set of blades and I straightend the main shaft, so I don't understand what the deal is and why that servo would be broken. Maybe it hit it just right, or maybe it is a QC issue, who knows.

Did some further checking. No radio interference causing it. I did notice that if I just rub my finger over the right stick while the heli is on the floor, with battery connected and radio on, with no throttle, the top blades move very quickly forward and back, as they are very sensitive to very slight touch of the stick. I than tried to hover it by really holding the stick without any movement, hard to do, and it flew without twitching.I also noticed that if you don't touch the right stick during a hover for that 1/2 second, before the CP Pro runs away, it doesn't twitch. So it seems to be me causing the problem because the radio lever is tooooo sensitive. How can we make it less sensitive??? Maybe the servo lever holes??? Any thoughts????

Darticus,

The CP Pro is a very sensitive heil, make sure that the heli is trimed out properly, it makes flying it alot easier. The most important are the blade pitch, blade balance and last but not least, that the swashplate is level in all directions with the elevator and aileron trim levers centered. Right stick, cyclic inputs should only be an 1/8 to 1/4 inch to make corrections.

Adding another wheel collar to the flybar will help it be a little more stabe, and your right moving the servo rods in one hole on the servo arm will tame it down too.

Dave / Choppersrule
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Check this out! Yesterday I got it to hover perfectly without any twitching. What a delight! Ran two packs and perfect. All I did is move the one trim lever, front to back lever, to center, as it was an 1/8 inch toward back and all went perfect. Today all was bad again, twitching real bad, so I landed jiggled the right lever gave it throttle and perfect it went. I landed to check again, took off to see what would happen and it started twitching again, landed again, jiggled the right lever and perfect it was again no twitching. When it takes off with no twitching its fine for the total pack, perfect! OK where is it??? Radio or servos or what??? Any suggestion would be great!

Darticus,

Sometimes it's a hard one to figure out. Is it the TX or one of the three servos? My bet, would be a servo that is starting to go on ya.

Try plugging and unplugging the battery to the heli, wait for it to arm each time. Listen and watch the servos. If you hear any buzzing or see any of the servo arms moving at all, that one would be a suspect. If you see that, swap two of the servo at the receiver and retest. If the same servo makes funny noises or moves, then you pinned it down... It may take a lot of testing. And may not fail right away.

Hope this helps,

Dave / Choppersrule
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