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Post by luckyarmpit on Mar 31, 2013 13:33:28 GMT -4
As I was working on the Chaos 600 build on Friday, I noticed there was significant warp in both the main drive gear and the autorotation drive gear. I've built several helis and no gear was ever perfectly straight but these have quite a bit of warp... so much so that I'm wondering if I should attempt to fly it this way. Check out the pics below and let me know whether I should buy another main gear set or just go with what I have? - Pic #1 is the gear mesh properly set - Pic #2 is the gear rotated 180 degrees... you can see there's quite a bit of difference in the gear mesh. - Pic #3 is the autorotation drive gear lined up perfectly with the tail drive gear - Pic #4 is the gear rotated 180 degrees and you can see there's significant warp in the gear by how it's lined up with the tail drive gear.
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Post by doc121 on Mar 31, 2013 14:07:22 GMT -4
Big gap in pic #2. I would change gears. I seem to do that on a lot of new builds.
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Post by Dr. Evil on Mar 31, 2013 18:45:51 GMT -4
Give them a call tomorrow and talk to Robert, he should be able to send you a new one. Let me know.
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Post by luckyarmpit on Apr 1, 2013 14:34:46 GMT -4
Give them a call tomorrow and talk to Robert, he should be able to send you a new one. Let me know. Spoke with Robert; new gears are on the way after I emailed him some pics. Thanks guys!
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Post by pilotpete01 on Apr 1, 2013 15:40:59 GMT -4
If the new gears dont work, KDE makes machined ones. They are really nice, thats what I just put on my 700.
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Post by luckyarmpit on Apr 1, 2013 21:25:38 GMT -4
If the new gears dont work, KDE makes machined ones. They are really nice, thats what I just put on my 700. I checked out those gears... jeez they are expensive. I know KDE is the best of the best but still. But thanks for the info!
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Post by Valkman on Apr 2, 2013 5:37:21 GMT -4
+1 on KDE. I remember ages agoIi had a slightly warped gear like your one. I got a large flat head screwdriver between the main and auto gear and kept bending the gear, rotating, and checking. It worked perfect and no warp. You now have a spare gear if one is on the way! Don't forget to put a nut on the bolt in the auto gear. It looks like it is missing in the picture. Aldo there is no need to over thighten that bolt, and if you do it will warp the gear.
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Post by luckyarmpit on Apr 2, 2013 10:58:44 GMT -4
+1 on KDE. I remember ages agoIi had a slightly warped gear like your one. I got a large flat head screwdriver between the main and auto gear and kept bending the gear, rotating, and checking. It worked perfect and no warp. You now have a spare gear if one is on the way! Don't forget to put a nut on the bolt in the auto gear. It looks like it is missing in the picture. Aldo there is no need to over thighten that bolt, and if you do it will warp the gear. Thanks for the heads up! Yup, I left that nut off intentionally as I knew I'd probably have to replace those gears. I actually thought about boiling the autorotation gear for a few minutes and then placing it on a flat surface with something heavy on top to see if I could get it straight. I'd have an extra autorotation gear if that was the case but the main drive gear is warped in the wrong way (left/right not up/down) so not much I can do about that one unfortunately.
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Post by heyvern on Jun 11, 2013 0:20:42 GMT -4
need some help! I just finished my chaos 600 and have a problem with the airframe shaking after lift off.On the ground the heli is smothe and no shaking at any rpm. this problem is not the tail shaking but the whole airframe shaking. It does not do this every time I lift off, when it does shake I sometimes can set it back down and bring the rpms to very low then bring the rpms back up and lift off and repete this 2 or 3 times then the shake goes away for the rest of the flight. This heli has not been crashed, it has behaved this way from day 1. I am at a loss as to why I have this problem. The blades have been balanced, all the shafts are straight, the tail Gyro is set, If some thing was bent or unbalanced it would behave this way every flight, but like I said it does not shake on every flight,just most of them but can be stoped by landing and taking off a couple of times until it stops shaking. Any ideas Thank you for any help you can provide.
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Post by Valkman on Jun 11, 2013 4:52:28 GMT -4
If everything is spot on like you said it is it sounds like you are running too low head speed. What HS are you running? Get it above 1900 rpm if you can. It is not uncommon to have this issue.
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Post by heyvern on Jun 11, 2013 7:06:45 GMT -4
I am running the 15 tooth pinnion at about 70% throttle as reccomended buy a fellow heli pilot. I am in the process of learning to fly the bigger helis and he said that this is what he would run until I get used to the machine. I will increase the rotor RPM and let you know the results. Thank you very much for the info
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Post by Chris Reibert on Jun 11, 2013 11:13:40 GMT -4
+1 on Valkmans guess. Sounds like a low head speed bobble to me. Bump her up to flat 80 or 85 throttle curve My scale birds I start higher and lower curve until I achieve lowest curve without bobble or shake issues
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Post by Dr. Evil on Jun 11, 2013 19:52:04 GMT -4
I am running the 15 tooth pinnion at about 70% throttle as reccomended buy a fellow heli pilot. I am in the process of learning to fly the bigger helis and he said that this is what he would run until I get used to the machine. I will increase the rotor RPM and let you know the results. Thank you very much for the info Sorry to hear about the issues you're having but like the guys suggested, try a higher HS and see what happens. The only thing I am not clear about is what exactly or should I say where and what part of the heli is it shaking? Is the tail swinging back and forward? Is it more of a vibration throughout the heli? Is the nose of the heli bobbing as mentioned? If changing the HS does not fix the issue, maybe you can video tape this problem and we can see if there is something else that could be causing the vibrations. Good luck
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Post by heyvern on Jun 12, 2013 22:46:35 GMT -4
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Post by heyvern on Jun 12, 2013 22:54:35 GMT -4
Valkman you are the man I took your suggestion and raised the head speed. I had it set on 65% at half throttle, I changed it to a flat 80% and it is perfect, all airframe shaking is gone. If you were closer I would buy you a couple of beers.Thank you and all the others for the suggestions, this is what makes this web site so awesome!!!!!!!!!!!!!
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