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Post by gauiman on Nov 26, 2010 0:31:17 GMT -5
Ive been having some issues setting up my pitch and roll links as well as my elevator link. In my manual it say that the pitch and roll links should be 55mm and 38mm, so I set them up like that and have binding. I went online to Gaui's website and downloaded a manual and it says that the pitch and roll links should be 62mm and 44mm on the elevator. On the left hand side with the nose pointing towards you my manual says that the pitch and roll should be 38mm. In the online manual on Gauis website it says that the pitch and roll on the left hand side should be 44mm. In my manual 38mm links are called for on the left hand side. If I were to set up links for 62mm and 44mm that would never work as of now the 55mm link does not work but the 38mm links works on the elevator. Ive measured my links with a digital caliper several times so Im pretty sure of the measurements. Im using the large JR wheels on my servos, does anyone have an ideal why the two conflicting measurements. Maybe somehow Im screwing everything up, I'll re-chek the Finlees vids again. Heres a link to the online manual, www.gaui.com.tw/pdf/H425_Manual_0804.pdf
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Post by dunkonu23 on Nov 26, 2010 1:30:23 GMT -5
How are you measuring the links? In the end, I've found that linkage measurements are simply starting points. What I would do is build one link per servo/bell crank. I'd hold the aileron/pitch/elevator in position and adjust the link so that at mid stick (making sure your servos are at center and you've made your offsets properly) your bell cranks are in the correct position. Then, once that's done I'd simply measure the link you just created and make one to match. Be aware that even then you may have to adjust a little more to make sure you don't get binding.
Also be certain that your servo endpoint adjustment is neutral, meaning for example that you only have 100's in the Endpoint menu if you have a DX7.
This is the way I did mine when I built my Gaui frame.
Scott
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Post by Jerrymac on Nov 26, 2010 2:44:17 GMT -5
I didn't use any of the recommended link lengths in either one of my builds. Basically, just set the elevator lever parallel to the main shaft and center the servo. Measure the distance between the balls and make the link rods the same size to fit. Just make sure both rods are exactly the same length.
Set the pitch and aileron bell cranks so that the top is parallel with the frame and center the servos so that you have equal distance between both balls on the bell cranks. Make the rods the same length so that they fit on without moving the bell cranks.
If need be, check out the "Finless" videos on the 550 build again. Many of the things he did in his build are no longer needed as Gaui addressed many of those problems, but, if I remember right, he does go into some detail about setting up the links.
The most important thing is that the links on each bell crank are exactly the same length.
The pics that Chipbutty posted of his build on here will give you a very good example of how they should look when finished.
Jerry
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Post by chipbutty on Nov 26, 2010 3:57:56 GMT -5
What Jerry and Scott said. When I made up both links I made sure that both would fit exactly on each set of ball links. You can tell when they're an exact fit. If you place the link over the balls there should be no movement if you wiggle the link from end to end. That's what I found anyway. This is where minute adjustments of subtrim made all the difference for me to get things exact. I just measured my links to give you an idea of how they differ from the manual. Centre to centre is the length between ball link centres. Inside is the measurement between the start of the ball links. The same way Gaui measures them in the manual: Pitch - Ball link centre to centre: 84mm, Inside: 55.2mm Elevator - Ball link centre to centre: 63mm, Inside: 34.5mm Aileron - Ball link centre to centre: 70mm, Inside: 41.5mm I'm using MKS mini servos with the adapter plates.
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Post by gauiman on Nov 26, 2010 9:05:25 GMT -5
Hey guys thanks for getting my critical thinking skills going again. I forget not everyone is using the same gear so adjustments are called for. I got my pitch and roll links at 50mm and my elevator links at 38.19mm. I dont see any evidence of binding at all
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Post by chipbutty on Nov 26, 2010 11:03:20 GMT -5
Good to see you got it working. I don't know why my aileron and elevator links aren't the same length I was under the impression everyone had those two the same.
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Post by dunkonu23 on Nov 26, 2010 11:18:27 GMT -5
Chip, Dunno why but if it works, why worry? That's the way I approach it. I remember building my T-Rex 500esp... those link stated lengths were all wrong. Some were wrong by a lot. In the end, it worked fine, but I didn't have ball link tools, so my fingers were ruined for a couple of days! Scott
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Post by chipbutty on Nov 26, 2010 12:00:51 GMT -5
Yes, I'm blaming this obsession on the strong steroids I've just been prescribed for polyps! I've been working on my 425 for 8 hours today It's got to be the drugs! Anyway, I know everyones measurements are different but it does seem that everyone has elevator and aileron relatively the same. Ah well! I should have some pictures to upload later Scott in my build thread with everything installed ;D Just need to check blade balance and secure the tail boom clamp. Chip, Dunno why but if it works, why worry? That's the way I approach it. I remember building my T-Rex 500esp... those link stated lengths were all wrong. Some were wrong by a lot. In the end, it worked fine, but I didn't have ball link tools, so my fingers were ruined for a couple of days! Scott
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