[:@]Went down again and had to replace blades, the sliding black, and center hub. Just tried to go for an evening flight and she won't go up. I put her at full throttle and still not lift. The throttle trim's at 65% which is where I normally keep her. What could be wrong? I checked my gyro and all the arms, etc. everything's responding pretty cool.

Thanks for any help

You may have inadvertantly flipped the grips. The ball links on the grips should be on the same side as the trailing edge of the blade.

Heliko you are the man!!

Am I?

...thanks

Ha ha ha good look. I did that when i put on my first set of blades. same thing happened.

I'm good there. I thought that too. I'm lost on this one. What else might it be?

Rotor spins but it won't lift off or the rotor won't spin? If the motor isn't turning check to make sure throttle at 0 before you start and that idle up is off. If it won't fly but is spinning up to full throttle then obviously you have a pitch problem that is keeping the heli from making enough lift to fly. Did you try to adjust tracking or something of that nature? A little wierd if all you did was replace parts, then you shouldn't be out of pitch range. Did you put the blades on correctly and not backwards? When viewed from above the rotor spins clockwise.

DK,
Are you SURE about the blade grips? Double check. Don't get pissed if I get too elementry here, just to be sure. Leading edge is the thick part, trailing edge is th thin part. Holding the bird straight out in front of you, the leading should be facing you on the right, the trailing edge should be facing you on the left. The grip on the right should have the ball joint away from you, the grip on the left should have the ball towards you. if you move the flybar, the pitch should change on both blades. If that works, unplug one of the main motor leads, turn on the xmittr, connect the flight battery, hold the tail boom steady, work the collective(or is it the cyclic? them technical terms always confuse me) in all four axies (forward, right, aftward, left) to make sure you get correct response in all four, then run up the throttle and look for pitch change as throttle increases ( no yaw input, left or right tail).

If you got the blade assembly and the hub correct (with the grips oriented correctly, remember that the picture in the 'Manual' is incorrect), the only thing that comes to mind is: 1) maybe you compressed one or more of the linkages (Plastic ballreciever on metal threads, the ball reciever threads can be forced in or out on the metal rod with enough force. Check blade tracking and response of the rotor disk under load (hold the birg, by the landing struts (or better yet, if you have a test jig use that), out in front of you (with the main motor plugged back in), slowly run the throttle up a little, do the above checks, run the throttle up alittle more and check again, and so on.

If that doesn't help you find the prob, I'm stuck, unless you have damaged the 3-in-1 board.

Oh, by the way: I had a hard landing (didn't seem to do any damage), but I couldn't get her to lift off after. Investigation revealed that the hard bounce had managed to jam the main motor into the main gear. Too much drag from tension, I couldn't get enough power to lift off. Tore her down and repositioned the main motor. Everything was alright after that.

Wish I could be of more help!

Good Luck,
Splat

Hey Splat. I never get pissed at help. I am about to re-examine the grips and try again. I will get back shortly. I did go off the pic in the manual.

Silly me. Had the stablizer hub upside down

I'm back in action fellas. Thanks for the help!

OK, another question along these lines - I stupidly experimented with idle up, and ended up twisting my tail boom, broke a ball off one rotor grip, and lost a linkage from the rotor grip to the seesaw. Bought new parts (rotor grip, linkage set), and got everything back together, and it flies fine, but the side of the rotor grip that is for the nut to go into is on the TOP (I swear it was on the bottom originally, and the exploded views shows the screw entering from the top!) Remember, only one linkage was lost - I have looked and looked and can see no way things could have gotten so twisted around to reverse this setting! The ball on the grip is on the training edge of the blade, as it should be!!! Just now the nut is on top, rather than on the bottom! My setup looks EXACTLY like the rotor head exploded view!

What's up??

I believe that they come a left and a right grip, that'll put the nuts down where they belong. But it seems to me, that I've done like you before, just inserted the screw, held the nut and tightened everything down and it worked fine.

if you are using your exploded views in the manual - it will show one blade grip the wrong direction, either look at the update on their website or remember that when the head is spinning, the balls should be on the following (trailing) side.

http://manuals.hobbico.com/hmx/hmxe04-addendum2.pdf

this will show you the right orientation for everything.

The main blade grips can go on either side. The screw head goes into the "nut" hole and the nut actually goes in the round hole. (it is opposite of how it looks like it should go) The blade grip arm and ball will be on the "thin" side of the blade or following the blade. If the blade is at the 6 oclock position the arm should be pointing towards 5 oclock. They grips are upside down (so to speak) for some reason.

Well, bought a set (2) of them, and both are identical! Nothing on packaging about left and right. AND, I am using the original blade grip the didn't break! And IT is upside down,?!?!? Plus, I have the updated diagram.

Any other guesses!!!?

That is how it "should" be. It will be upside down. Just put the nut in the round hole on the bottom and put the screw into the "nut" hole from the top. It doesn't hurt to do it that way. For some reason they manufactured the grips "upside down".
Oh, I just looked at our post times and we posted simutaneously.
Sorry, if I am misunderstanding your question.

Well, problem is the nut spins in the round hole! Thanx for the info anyway, I'll just live with screwing it upside down! (no smart comments, please!)

Well, you are about ready to try 3d aren't you? LOL

Glad you got it pegged and fixed.

Splat

a drop of CA and a bit of quick work would hold that sucker in place. Just dab the nut, hold it into place, thread the bolt and tighten down... should do the trick for you!

Went by my LHS at lunch and all the blade grips are upside down! So, was the nut CA'd when it came from the factory??

No, mine weren't. You just have to remember to take the nut out when you break the grip. I don't CA mine in, they work fine in the round hole, I don't have any problem with them spinning around.
Good luck flying and may you be crash free.

Yeah - in my dreams. I've been flying fixed wing for over 25 years - this is a whole new animal!!

I'm having a similar problem with full throttle and no lift. When I check my pitch at full throttle it still looks like the blades have a negative pitch. The servos are at 90degrees. I've measured the linkage arm lengths to the manual's prescribed length. All of my trims are centered. Trailing edge is the same side as my ball link on the grips. The leading edge is set to spin onto the clockwise rotation. The tracking adjustments look fine... if I were to unscrew them to increase the pitch it would seem like I'd have to open them up more than they could open. So somehow on this project I've drastically changed the pitch. I added new hitec hs55 servos. Is it possible that the downward throw isn't low enough to generate the necessary lift? The motion looks good and they all move in unison. I read were someone had their stabilizer hub upside down... I'm looking right at it but I'm not really comprehending the malfunction. I'm pretty sure I just have something reversed or upside down but I can't think of anything else to check. The tracking is fine.

PapaST offhand I can't think of anything that would be wrong. If you could take some pics I think it would help alot.

The blowup of the rotor head is pretty detailed and self explanatory.