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Thunder Tiger Electric Helis Mini Titan E325, Raptor E550 and E620 SE Helicopters |
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01-02-2015, 03:40 PM | #1 (permalink) |
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Join Date: Dec 2011
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MKS DS93 cyclics and E325 or E360
For reference, I'm running AR7200BX (BeastX) gyro.
I've swapped out the OEM cyclic servos on my E360 (same geometry as E325) with MKS DS93 servos and found that I can't keep the same swash link geometry with the standard MKS arms. The swash links are almost perfectly vertical all round with the OEM servos, but are slightly skewed with the DS93's. Strangely I could get perfect vertical placement with the elevator servo by using the third hole out, but the third hole would cause linkage interference on the aileron and pitch servos. After I changed to two holes out on the arms, the aileron and pitch links are almost vertical but the elevator link is skewed to the right when facing the front of the bird. Is this a problem I should be concerned about? I thought about keeping the elevator on the third hole, but then it would have different mechanical gain from the other two. Would that cause headaches with the gyro or can the gyro compensate for different ball placement on the servo arms?
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Specter 700, Synergy 516, Goblin 500 Sport, Oxy 2, OMP M2 V2, Blade 300 CFX, Oxy 3, Blade 270 CFX, Align 470LM, Goblin 380, Devil 380 Last edited by OrbitalGolem; 01-03-2015 at 04:03 AM.. |
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01-03-2015, 01:04 AM | #2 (permalink) |
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Join Date: Feb 2010
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I think its important to keep all three servos on the same hole.
I have mounted my ds95 side servos slightly further out from the frame to use the fourth hole on my servo arm. I just secured the servo to the mount using the side servo mounting hole rather than the centre servo mounting hole. My skookum fbl is happy with this mechanical gain and the heli flies perfect. It just needs a better pilot now :-
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Nick Flying your heli the world is still out there, but at least for the time it hasn't got you by the throat. Mini Titan E325 FBL, Blade Nano Cpx |
01-03-2015, 08:24 PM | #3 (permalink) | |
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Thread Starter
Join Date: Dec 2011
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Quote:
I've attached pictures of my set-up. The elevator servo arm in the pics is off-center toward the ground, but you see that the link is not perfectly vertical. Fortunately, the other two links appear to be as close to vertical as your's are. Did the mounting the aileron and pitch servos further out interfere at all with the canopy fit? The E360 canopy fit is already tight and I did notice that the lower edges of the OEM servos were scratched a bit. A few quick questions pertaining to the elevator servo and its movement affecting the cyclic limits. I realized when I installed the DS93s that I had configured the BeastX cyclic limits high enough to allow the elevator servo to move in the mount when the arm came in contact with the frame side at full negative cyclic. Unfortunately, that was the only way I could get a blue LED from the BeastX indicating that the cyclic range was large enough. With the slightly shorter arm on the DS93, the ball comes in contact with the frame sooner than with the OEM arm and I winced when I saw the DS93 twist in its mount at full deflection for a blue LED. I lowered the limit to where the arm just makes contact with the frame, though the Beast is showing a red LED. I kept the standard +/- 12 degrees collective max. Does your elevator servo arm come in contact with the frame and allow for the servo to move slightly in the mount?
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Specter 700, Synergy 516, Goblin 500 Sport, Oxy 2, OMP M2 V2, Blade 300 CFX, Oxy 3, Blade 270 CFX, Align 470LM, Goblin 380, Devil 380 |
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01-04-2015, 01:45 AM | #4 (permalink) |
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Join Date: Feb 2010
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My skookum fbl setup gives best results with ball on outer hole of arm. This measures approx 15mm from servo centre if I remember correctly.
Your setup looks to have much shorter ball to servo centre. Can you measure this? I think it should be at least 12.5mm My servo arms never touch the frame . Im running +-12 degrees pitch We have different frames . Mine is a V1. This may make a difference. Im not familiar with beastX either sorry. Ilet us know your arm length and if less than 12.5mm try increasing it, then we can take it from there. Hang in. This should be an easy fix
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Nick Flying your heli the world is still out there, but at least for the time it hasn't got you by the throat. Mini Titan E325 FBL, Blade Nano Cpx |
01-04-2015, 01:27 PM | #5 (permalink) | |
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Thread Starter
Join Date: Dec 2011
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Quote:
After browsing countless threads last night, I came to the conclusion that the red LED is still okay for a trial flight. I went out today and she flew really well with the exception of the flip/roll rates being a little slower than before (I expected that). I didn't notice any significant difference with elevator or aileron tic-tocs. For the second flight, I expanded the cyclic limit on the BeastX slightly, such that the servo shifts a tiny bit in the mount at full negative collective/negative cyclic. That improved the flip/roll rate slightly. The stability was bloody exceptional though - SOOOO much better than the OEM cyclics. Oh my goodness.
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Specter 700, Synergy 516, Goblin 500 Sport, Oxy 2, OMP M2 V2, Blade 300 CFX, Oxy 3, Blade 270 CFX, Align 470LM, Goblin 380, Devil 380 |
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