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Post by Valkman on Mar 18, 2013 4:36:31 GMT -4
I dont't think the issue is that arm. Looking at the picture where you have zero pitch the arm is in the right postion. The swash also looks the right height.You need to sort out the other two outside servos and the links on them going from the arms to the swash look short but I could be wrong. I have the straight arms so I can't measure mine for you.
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Post by edintexas on Mar 18, 2013 8:30:12 GMT -4
Valkman, The servos are shown mounted upside down in the assembly manual. The way I understand it, they're designed to allow you to square the linkage when the slanted control arm link ball is in the correct position (in line between the control shaft and the elevator servo output shaft). You are correct about the link rods being too short. I posted about this in the "Build Suggestions" thread. Others have noticed the same thing. The correct length for these needs to be 55mm for the slanted control arms, but the ones supplied with the kit are 50mm which was the correct length for the straight control arm type with the servo mounted upright. The 55mm rods are hard to find online. I finally found them in the 700 linkage kit, but you need to buy two kits because there are only two in each kit. I may change them but others have commented that they fly with the 50mm rods and haven't had a problem. Still struggling!!
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Post by edintexas on Mar 18, 2013 9:11:26 GMT -4
Sorry, I just re-read your message and realized that you were talking about the two aileron control links being too short. I set those link lengths to get the swash plate level at mid stick after I got the elevator control arm level. I was talking about the 4 servo link rods being too short.
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Post by Valkman on Mar 20, 2013 7:45:59 GMT -4
In this picture everything seems ok apart from the pitch and aileron servos. At zero pitch those servos need there wheel pointing straight up. In order to do this it looks like you need A: Longer links ( the 55 ? ) going to the swash, B: Maybe flip the "A" arms to the other side or c: Rotate you servos back around, wheel on top. What ever whay you look at it, the side servos need to be sorted, not the elevator. chaoscrewlounge.proboards.com/index.cgi?action=downloadattachmentpage&board=600e&thread=908&post=10003
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Post by edintexas on Mar 20, 2013 10:43:18 GMT -4
I was thinking that the servo linkage needed to be square at zero pitch (same diagonal measurement both ways) and the aileron link ball level, no?
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Post by Valkman on Mar 20, 2013 15:45:35 GMT -4
Have a look at this picture again. Ok his elevator link is a bit high in the pic pushed up his swash at the front but it looks right. His servos are also put in other way round compared to yours. The servos all have to be center at zero pitch. Otherwise they will give uneven throws.
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Post by chitty024 on Mar 20, 2013 15:54:06 GMT -4
Have a look at this picture again. Ok his elevator link is a bit high in the pic pushed up his swash at the front but it looks right. His servos are also put in other way round compared to yours. The servos all have to be center at zero pitch. Otherwise they will give uneven throws. Are you saying he should get the A shaped arms instead of these offset arms and change the servos around? I have these arms with my servos upside down. That's what the esp manual shows.
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Post by chitty024 on Mar 20, 2013 16:08:43 GMT -4
Terrible pic but here is how mine is set up and I haven't had any problems with it for the past year.
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Post by Valkman on Mar 20, 2013 17:16:18 GMT -4
Yea but you were flying with 8.5 + pitch!. What full pitch range are you getting on your setup Chitty? And what length are you links from the A arms ( I keep forgetting yours are not A ) to the swash.
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Post by edintexas on Mar 20, 2013 17:38:52 GMT -4
Chitty, My setup is identical to yours. Look back a page or two and you can see the pictures I posted. My problem is that when I have the swash level and all the control arms are level and the blades are adjusted to 0 degrees pitch at mid stick - full collective only gives me about 9+ degrees and the washout is hitting the headblock. It seems like I should be able to get 10 or 11 at least.
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Post by chitty024 on Mar 20, 2013 18:06:04 GMT -4
bam! nice Valkman 12 up 11.5 down....the links are 59mm
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bobsp12
FUN FLYER
The CHAOS theory rules my life
Posts: 155
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Post by bobsp12 on Mar 20, 2013 20:00:10 GMT -4
ed, one thing you haven't mentioned yet, is what your total travel is....ie your combined up and down collective....if you are getting 22+ degrees then it is a matter of figuring out your swash levelling to be in the centre of that. As you have said, the elevator link is the defining item for swash height, you could try reducing that link height with a bit of shortening of the link if there is enough available material. The plastic elevator link on mine is 10.7mm from ball centre to the top of the elevator arm.
But if you can't get that much travel, then your available main shaft height is not enough....mine has 67.5mm from the top of the mainshaft collar to the bottom of the head block.......it could be something as simple as the hole in your main shaft for the head block is wrong. I assume you had your bearing blocks in the correct orientation.
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Post by edintexas on Mar 20, 2013 21:00:31 GMT -4
9+ up / 10 down. I've suspected that the elevator arm height was the problem but I talked to Cliff today and now I don't suspect it anymore. He measured one off the shelf at 53mm overall and that's exactly what mine measures. Back to square one. Thanks to Chitty and Bob for the info.
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Post by chitty024 on Mar 20, 2013 21:32:19 GMT -4
Have you made sure the bearings are oriented correctly? Im running out of ideas....what really bothers me is i had the same problem but cant recall the fix.
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bobsp12
FUN FLYER
The CHAOS theory rules my life
Posts: 155
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Post by bobsp12 on Mar 20, 2013 22:07:45 GMT -4
you are not really back to square one....at least you now know that the swash is not the problem....you need to find out why you do not have enough main shaft available for the swash to travel on....there is something strange about how your main shaft collar bears against your upper bearing...it seems to be sitting high....I will see if I have a spare mainshaft somewhere and measure the distance from the bottom up to the head block hole....we will get to the bottom of it sooner or later....funnily enough...in those pics that someone posted today of his build so far....he has his middle bearing block upside down...
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