CPP trim and weights
 

well this is a new heli to me(bought from a fella that didn't fly it too much). i am trying to get it dialed in. adjusting some of the prop and gain pots,etc. i seem to have those set properly now.
to get this heli into a relative short hover the trim on the controller for the 'elevator' has to be all the way forward. if not, it will just flying boom first and i need to apply a lot of forward stick to level it off.
another question is the weights. these are set in stock location... to make it more stable in hover are people moving these stock weights or are they buying additional ones and installing them. can the one on the inside of the paddle be move outwards?
i'm am looking into the tracking of the blades but am new to this so i'm not too sure how to determine if they are out. i know i read that you power up the main rotor and watch them... then determine which one is out,etc. just not sure how i'm going to figure out which one needs the adjustment.
any thoughts would be great.
thanks

RE: CPP trim and weights
 

Hello Swixtt,

Move the battery as far forward as needed to level the helicopter when you hold it by the flybar near the hub, or even sligthly nose down.

You cannot move the two inner collars on the flybar because they are not weight, they are physically attached to the paddle control frame and they maintain the fly bar in place. Adding new weights at the tips near the paddles will give them more inertia and will dampen the cyclic response.

As for the tracking, you can put different color stickers (say one red and one black) at the end of the blades on the leading edge. Then physically hold the helicopter down with weight or a piece of rope or something, then advance the throttle to 75% so that it produces lift. Wear safety glasses and look at the revolving blades from the side of the disc, and see which one flies lower or higher. Say the red one is higher and you want to lower it, you simply shorten its pitch control link in half turn increments until they are flying at the same level. One half turn will result in a 1/8" height difference, more or less.

How to decide if one is too high or the other too low? If you don't have a pitch gauge, (which is a good investment) then you need to check that the pitch of both blades is reasonably level when the throttle is at 50% with the motor disconnected from the ESC. So let's say for example that the red blade has some positive pitch when the throttle is at 50% with the rotor at rest and it is flying higher that the other one when checking the tracking with the rotor turning, you should then lower it instead of raising the other one.

Does this help?

Good luck
Georges

RE: CPP trim and weights
 

k, for the tail issue, sounds likr your swashplate needs to be leveled or it's too heavy in the tail. If you hold the heli by the flybar (with main rotors facing front and back) does the heli sit with it's tail lower or are the skids level? If it's level then the swashplate needs adjusting and leveled, be carefull tho, to mutch adjusting of the plate can cause blade pitch issues.

as far as the weights, stock your heli only has 2 weights, the inner collars are not weights they are collers to hold the flybar in place. Usually for us beginners the smaller weights should be all the way out and some people do add another set to their heli. Always leave the collars in where they are.

for blade tracking, what I do is place a piece of color tape on one blade and when I spin up I watch to see which one is lower then adjust the pushrod for that blade, but remember if you have a bent shaft or bent spindle, the blades might not track at all, watch your blade pitch too when adjusting.

I think thats all the correct information, if not I'm sure aomeone will correct me....

RE: CPP trim and weights
 

Go to www.bladecprepair.com and that has all the info on how to mechanically set up your heli. great pics and well written and simple instructions. Mechanical setup on CP helis is critical.


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Of all the things I ever lost............................................. I miss my mind the most!

RE: CPP trim and weights
 

thanks for all the info guys! yeah i can balance the heli fine when i pick it up.... it's even slightly nose heavy!! it must the swashplate that is out. i'll look into that site for reference and for tracking! some good info in there.

RE: CPP trim and weights
 

Hi swixtt, I used the the forums to pick up on tips and trimming advice, a properly trimmed heli makes all the difference when hovering. Also last month when I started I was wondering how I'm going to get this thing off the ground, how do I set it up and how do I fix it, all these questions were answered by reading threads on this forum and from hands on rebuilding and setting up the heli after every mishap. Now I know the heli like the back of my hand, can fix and setup the heli really good so when I go to fly there is no vibrations and hovering is easier. The biggest things I look for when setting it up are the mainshaft/gear is straight, spindle straight, swashplate level, blades balanced, blades tracked, flybar straight, check the CG of heli from the flybar and adjust your proportional and gain pots. If all these things check out then you will have a vibration free heli that will seem more stable when hovering. When I track the blades I use a different color grease paint on the tip of each blade(the kind you use for kids face painting), put weights on the landing gear to hold down the heli, spin it up to 3/4 throttle then using a folded sheet of paper carefully while holding it level and flush to the surface of the table slide it towards the spinning blades until they nick the paper. If the two colors are different in height you need to turn the pitch link of the low blade a half a turn at a time until they both nick the paper at the same height. If your pitch is off you might need to lower the top blade but so far I've only needed to raise the lower blade. I know it sounds like alot to do but it should be done after any repairs to the heli and now after a few times I can completely rebuild my heli in the time it takes to charge a battery. There are also a few mods I have done from reading this forum, extra weights on flybar, sym plasti-blades, super skids, fuse mod, paper clip mod and I put a piece of fuel line tube on the throttle tab inside the TX to stop the ratchetting effect. I do have a DD tail upgrade on order. Hope this helps, Good Luck and Happy Flying. Rick