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Post by edintexas on Mar 11, 2013 21:29:15 GMT -4
Sounds like the way to go. Can't say I feel good about it though. Thanks for the info.
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Post by chitty024 on Mar 11, 2013 21:49:44 GMT -4
Maybe someone else could chime in here?
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Post by Dr. Evil on Mar 11, 2013 22:17:10 GMT -4
I would but I've gone FBL and honestly I can't remember how my FB was setup.
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Post by osidak on Mar 11, 2013 22:17:49 GMT -4
my elevator link is level i believe. need to get a battery out and check it out. i will pull some measurements as well. at mid i am 0 degrees going up to 12 or 13 degrees pitch
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Post by edintexas on Mar 13, 2013 9:16:27 GMT -4
Here are a couple of shots I sent to Cliff at RCA. I'm new to this but my instincts are usually pretty good and this just doesn't feel right. There's a little parallax error but the pitch gauge really is level with the flybar. Attachments:
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Post by edintexas on Mar 13, 2013 9:18:28 GMT -4
High stick. Attachments:
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Post by edintexas on Mar 13, 2013 9:19:09 GMT -4
Washout hitting headblock at high stick Attachments:
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Post by edintexas on Mar 13, 2013 9:19:50 GMT -4
Height of swash at midstick. Attachments:
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Post by edintexas on Mar 13, 2013 9:21:31 GMT -4
elevator position at midstick. Attachments:
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Post by chitty024 on Mar 13, 2013 21:15:18 GMT -4
I am a little stumped on this. What do the rest of the links measure? Are they all set exactly as the manual states?
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bobsp12
FUN FLYER
The CHAOS theory rules my life
Posts: 155
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Post by bobsp12 on Mar 14, 2013 0:03:24 GMT -4
edintexas...I just dragged my 12S Chaos 600 FBL out of it's box where it has languished for over a year and had a quick look and measure....If I remember correctly, I had a similar dilemma when I set mine up, but that was over two years ago and the memory is a bit hazy. I threw a flybar lock on and took a couple of measurements: my servo bellcrank to swash links are 60.5mm, the elevator sits level in the centre of the hole. The top of the lower swash ring ( the section where the servo links attach) to the top of the carbon frame step (where the upper bearing block is bolted) is 29mm at zero pitch. My mixing arms are 49 mm hole centre to centre and 18mm from the pivot to the shorter end hole centre. I am getting 11.5 degrees of pitch travel, leaving a small gap between the headblock and mixing block. I have noted to get the extra 1.5 degree of travel you only require about one mm of swash vertical travel.
One thing to check is that the lower of your main bearing blocks ( the centre one of the three down) is fitted opposed to the upper one. That is that the screw heads for the main bearing retainer are on top of the block whereas the upper block has the screw tails on top of the block. The bearings don't seat centrally in the vertical plane of the bearing block. If you have the centre block the wrong way around then the main shaft will seat lower in the frame, giving you less shaft for the swash to travel on. I know I keep calling the centre bearing block the lower main bearing block, but the one under the main gear is more of a main gear support than a shaft support like the upper two. I think that cured my problem, sorry but I have built a number of helis since and they are all different and tend to blur a bit. I notice that you either have some sort of shim under your main shaft lock collar where it bears against the upper main bearing or else it is a different shape to mine...that shouldn't matter regarding the lack of pitch issue but anything under the lower main bearing ( the centre one) will make the main shaft sit lower in the frame and give the problems that you have.
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Post by edintexas on Mar 14, 2013 7:22:23 GMT -4
Bob, Thanks for all the information and the trouble you went through to get it. I didn't notice in the manual that the top two bearing blocks should be opposed. In fact, the Chaos 600 manual I downloaded doesn't even show the third (bottom) bearing block. I'll check that tonight along with the measurements you came up with when I get home. As I recall however, my measurements were the same or very close to yours. One thing about the main shaft position being dependent upon the middle bearing block's orientation that has me thinking that I have that correct is the mesh between the auto-rotation gear and the tail drive gear. The main/auto-rotation gear assembly's position is fixed on the shaft. If the shaft were too high or too low you would notice it in the mesh of the AR and tail drive gears being out of plane or else the Main and tail drive gears rubbing against each other. That's not the case. What you said about the top two bearing blocks makes sense. Both those blocks accept thrust in opposite directions as well as radial loads. The top one is loaded by the shaft collar when the aircraft is inverted and the middle one is loaded by the main gear when it's in a normal attitude. The bottom bearing only has radial loads on it. I'll check everything you mentioned when I get home tonight. Thanks again.
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Post by Valkman on Mar 15, 2013 20:13:11 GMT -4
I just came across this now and its late and I'm tired so I'll be quick! The control arms in the last pic look a bit odd. Your servo arms should be straight at zero pitch. Are you sure the links at the end of the control arm going onto the swash are the right length? Is the servos upside down ?Have a look at this picture. takingflight.net/wp-content/uploads/2013/01/-28891210495888333.jpgI will dig my FB head out tomorrow and check the links also. I was getting 12 +-. But I do think it is the servo the worng way round
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Post by Valkman on Mar 16, 2013 4:15:48 GMT -4
Ok I woke up and I think I might have an answer for you without going home and checking my FB head. On the elevator arm going to the swash there is a grub screw which looks like it needs to be loosened and realigned. Here is what I would do.... 1 Take off the head. Get the swash level first and you need the head off for that. 2 Put equal throws on you servos and put the servo at %50 travel. 3 Adjust the links and that elevator arm until the swash is level with a level tool. 4.Level the swash at full + and - on the TX end points. 5 Put back on your head and check pitch range.
If the head cannot give any more pitch and you are still not getting +12 then I would adjust some links on the head i.e the ones going to the blade grips. If by doing this you are not getting full -12 then I would adjust the end points on the tx till you do. Check everything for binding issues by going full pitch + and- and going full throw on cyclics. To be fussy, which we usually are with heli's, I would take back off the head and check the swash is level at full throws again, but only if you messed around with the end poiints. Let us know how you get on mate.
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Post by edintexas on Mar 17, 2013 19:28:44 GMT -4
I've leveled and releveled the swash. The problem is that when the elevator arm is level (meaning that the hinge is centered in the viewing hole) the swash plate is too high. I can get more than enough pitch if I add a bunch of sub trim to lower the elevator arm but then it's way below level. It's as though the vertical part of the assembly is too long. Can someone please measure their elevator arm from the center of the plastic swash ball-link down to the center of the hinge screws and post the measurement? Thanks.
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