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Any info regarding this x8 setup?Better than coax x8?
I saw this x8 setup In this thread:https://www.rcgroups.com/forums/show....php?t=1483594
And wonder if anyone out there has any information regarding this setup. I have search on octo x8 but haven't found anything.I think this setup should work better than a coax x8,because the props may not disturb each other in same way because the upper engine is placed more too the center of the copter (correct me if I'm wrong) What controller support this?Mikrocopter?Other's? |
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Thread OP
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controll program(like openpilot,ardcopter,mikropcopter and similar have)does't there exist any ready made setup program?(sorry if the question seem's dumb I'm little new too this...). Another thing I was thinking of why does't you see this setup,If it's now better(?) than coax x8.What is the down side? |
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If anyone could link too a construction or some more info, it would be nice |
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To get an equal CW/CCW directions yawing, you should have to associate 2 inner props with 2 outer props to balance the combined moments (2LENGTHs+2lengths).
To achieve more yawing response, PhotoShip seems to use small angular pieces, as motor mount, to increase the tangential/diametral yawing thrust. |
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You will get excellent performance for an octo in any form even on a FCB that does not use mixing for each of the eight motors. A PID tunable quad board made into an octo with y-servo cables to duplicate the motors on each axis will fly just fine with failsafe redundancy.
Cheers, Jim Quadrocopter and Tricopter Mega Link Index |
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Just think of an X8 like two quads. Let's say the left front and right rear arms has all the motors (top and bottom) rotating clockwise. In a left yaw you will increase all four motors on the left front and right rear arms. Even if the top and bottom motors are NOT rotating in the same direction on the same arm. You will still have to increase speed on four motors. Two for the top and two for the bottom. The only situation I can think of that mixing is required is when all the propeller spin one way on the top and spin the other way on the bottom. Then you will have yaw that reacts differently between right and left because one way you have longer arms and the other way you have shorter arms. |
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Last edited by SeismicCWave; Aug 13, 2011 at 02:49 PM.
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What I think it's great with this setup is that you could get a lighter quad than a ordinary flat octo because you only have 4 arms,and it may get better lift capacity than a coaxial x8 quad because the probs dont disturb each other that much like a coaxial x8. The disadvantage would be (I think) to setup it correctly (maybe mixing with the pids' or use angular motor mount as said before) or could it be someting else And it may in some eyes dont look so nice |
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Actually, if you take the 4 arms/8 motors option, excluding motor coaxing, you have to compare:
- Each arm having 2 motors side by side, upside. - Each arm having 1 motor upside, 1 motor downside (2 cases: upside motor tip & root of arm) - Each arm having 2 motors side by side, downside. As you are seeking for a specific advantage/gain, by comparing you can find the layout yielding the best outcome. Perhaps the gain is noticeable, perhaps not; In this case, simplest is the best! |
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Having 2 engines downside on each arm should be the best I think you should get best thrust then props does'nt have to blow on the arm(maybe little to gain on) and then you have less vibration(see the link in first post). The disadvantage would be long arms to get place for the probs.Thats why (I think) photoship have make their quad with one engine up and one down |
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