View Full Version : Need help from those running 3400g or z3650 please
02-18-2008, 02:08 AM
Hi, i have PM'd Jason Chow and he has helped me with suggestions in the past so I PM'd him about this but dont know if he will have the time to check these things for me. I figured I would also ask here to see if anyone of you guys could please let me know the lengths of the linkage rods you have on your head. I need the lengths from the servo's to the swash.. the swash to the mixing arm.. the mixing arm to the grips. I just cant get the right setup to get everything even and have the swash flat and level and have proper throw with a good range of pitch. I am using the longer JR arms that come with their bigger servos and I am using the 3rd hole on them on my z3650. Did you guys also try to center the servo in the frames since they have extra space in the cut outs or did you try to push them all to one corner so you would know its even? When I centered all the servos and made all the links that go from the servo to the swash equal length, the swash is not level and is tilted back alot. I have to then adjust the elevator link alot to get it even but that makes all the links different sizes now. I dont know.. im going to rebuild it all from the servos up in a few days but I was just looking for help on what rod lengths are working for you. Thanks alot
02-18-2008, 02:16 PM
hit me up on aim and ill see if i can help you solve the problem :)
02-18-2008, 04:30 PM
hey man. thanks. Let me know if you think you'll be on any time tonight in a few hours. I have to go to my medical chem class right now and then im heading to the gym so i should be on in like 3 or 4 hours. I'll look for you either way.
02-18-2008, 04:55 PM
Center the servos in the holes.
Use the 2nd hole in from the end on your servo arms. I think thats the 3rd hole out as you're referring to.
On the pitch/aileron servos run 17.5mm measuring the length of metal rod that is still showing between the 2 end links.
On the elevator run 20mm between the 2 end links (20mm of rod showing).
All other link lengths in the manual should be very, very close.
I've set up 3 of these 500's with 3421's and Z3650's, they all come out about perfect with these dimensions.
02-19-2008, 02:32 AM
I set up the links as u suggested. 17.5 mm on the ailron and pitch servo to swash and 20mm on the elevator. With servos centered, the swash was level. I worked my way up and adjusted all links to the specs in the manual and when I was done, one blade read 4.5 degrees and the other read 2 degrees at mid stick. This sucks man.. i dont know what is going on. Something has to be bent some where but I changed all the shafts since my heli crashed in an inverted hover about a foot off the ground due to a lockout or brownout or whatever they are calling it now. I dont know what the hell is going on. I adjusted the links on one blade grip a few turns so that I could get it to read the same as the other blade. Then I turned both links the same amount on each grip to get them to each read 0. They now read equal pitch levels even tho one link is smaller than the other. That shouldn't matter tho but I wish I know what was causing this. Its got to be either the grips or the swash plate. Those grips look pretty heavy duty and they look straight. My swash looks good too so I dont know.. I guess i'll just fly it like this and maybe start buying individual head parts later and put them on one by one until I find the problem. I never had a problem like this before
02-19-2008, 11:22 AM
I can measure my links from the swash to the mixing arms tonight if you'd like? I know the factory lengths were very close, but I did have to adjust them a turn or so.
How do your mixing arms look when you're at mid-stick. Everything is level?
How do you know your swash is level? I use the FMP swash leveling tool. I really like it, it works very well on the 500.