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01-28-2015, 11:02 AM | #1 (permalink) |
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Join Date: Mar 2011
Location: West Seattle, WA, USA
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Tail setup: Skookum 0° or helicopter manual mechanical setup with some pitch?
The Skookum tail setup wizard states to setup the tail with 0° pitch at neutral. However, most helicopter manuals state to setup the tail at neutral with the bell crank at 90° to the tail case which usually ends up yielding a tail pitch of 3° to 5° against the main rotor torque.
Since it is not possible to have it both ways, which tail setup takes precedence, the Skookum unit or the helicopter manual?
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01-28-2015, 11:43 AM | #2 (permalink) | |
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Quote:
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
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01-28-2015, 01:42 PM | #3 (permalink) |
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Be aware that some models will end up with the tail rotor control rod being too long if you follow the SK TR setup guide.
It happens on my Trex 600E with the CF control rod. I have to screw the ball-links all the way in (until they bottom out) and it is still about 5mm too long. But, I still follow the SK TR guide and do not "pre-comp" the tail rotor pitch |
01-28-2015, 02:25 PM | #4 (permalink) |
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I guess I should not worry either that the left and right throws will be unequal, correct?
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14S Specter 700 V2 NME/Tron 7/Kraken; 8S Tron Dnamic; 7S Kraken 580; 6S Buddy 380 KSE VBCE/Neo/EVO, Jeti/Spirit, YGE "T" ESCs; LiFePO4 field charging batteries Sims on Mac: Heli-X, neXt, AccuRC, Phoenix, AeroFly RC7 Ultimate Amain Team Pilot |
01-28-2015, 02:36 PM | #5 (permalink) |
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That is normal too if the heli has some offset built into the tail. Just try and use the servo ball hole that gets your endpoints closest to 100 even if one is a little different than the other, and all will be fine
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Tony Synergy 516, Gaui R-5 Speed (RIP), Cypher Vtol Jet (RIP), Spirit FBL, Hobbywing and Scorpion Tribunus ESC, Xnova motors. The girl in my DX9 tells them all what to do |
01-28-2015, 03:00 PM | #6 (permalink) |
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Thank you
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14S Specter 700 V2 NME/Tron 7/Kraken; 8S Tron Dnamic; 7S Kraken 580; 6S Buddy 380 KSE VBCE/Neo/EVO, Jeti/Spirit, YGE "T" ESCs; LiFePO4 field charging batteries Sims on Mac: Heli-X, neXt, AccuRC, Phoenix, AeroFly RC7 Ultimate Amain Team Pilot |
01-29-2015, 01:20 AM | #7 (permalink) |
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First set up your tail servo so that the tail pitch slider is at centre position when the servo arm is at centre position.
This way, you have equal servo travel both ways. Then, setup the tail pitch slider using the SK-software. Adjust the centre tail value so that your tail blades are at zero pitch. |
01-29-2015, 08:58 AM | #8 (permalink) | |
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01-29-2015, 09:04 AM | #9 (permalink) | |
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The travels from center pitch don't have to be equal, and mostly you should need more right then left. The best is to follow SK instruction to the word, not only regarding that subject!
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01-29-2015, 10:19 PM | #11 (permalink) |
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There is nothing to interpret. check again: it says to put the servo to 90 and the blades at 0.
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01-30-2015, 06:51 AM | #13 (permalink) |
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what i wrote is from the wizard not the manual, and what you just wrote doesn't contradict it.
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01-30-2015, 06:08 PM | #14 (permalink) | |
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I'm not going to get into an argument here. You seem to be quite fixed on your point of view. Suffice to say that yes, it does contradict what you said, as you can have zero pitch at centre stick (as per the Skookum manual) without the servo arm being at ninety degrees. |
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01-30-2015, 10:20 PM | #15 (permalink) |
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i will check the manual. please open the tail wizard and see what im talking about.
anyway i dont think the difference is great between them and i have also tried your option in the past, but we see too many cases of avoidable truobles here just because guys don't follow the wizards.
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01-30-2015, 10:51 PM | #16 (permalink) |
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SK support rep, is a rep for a reason!
Sometimes building many helis of poor good and excellent quality exposes you to the variations in proper tail geometry. Placing the tail pitch slider in the center of tail shaft will not always result in 0 pitch on the blades
Groucho, no disrespect intended but if I asked you to set up my KSM in your recommended method the tail would be fubar! I am not arguing, it's just a fact, my humble advice is to follow the instructions and listen to the guys who are authorities, like Georgie, the reps, the manual and the Wizards! Poor interpretation of the written word has resulted in thousands being killed!!! Our helis are actually quite dangerous if not setup properly, so if in doubt, pick up the phone and call Art, the final word in all things SK
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01-31-2015, 02:18 AM | #17 (permalink) | |
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Not exactly what you wrote...and i still understand the same. also the wizard is very specific.
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01-31-2015, 07:42 AM | #18 (permalink) |
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Join Date: Jan 2013
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Center servo horn 90 degrees - adjust rod to have 0 pitch on blades - adjust left travel - adjust right travel; all following the wizard or directly with the center, left and right buttons in the software.
This is the method the wizard calls for and has been working for me on all helis I've set up. Even on some with very noticeable built in mechanical dissymmetry like the TREX 600e DFC. You do not have to adjust left and right travel until binding, you can set less travel and if you wish have the same both direction from the SK center point. Usually, the actual built in mechanical dissymmetry will take care of the precomp in one direction. Again, fly, piro and adjust travels if inconsistent speed in a direction (which I never notice with initial setting to be honest). Make sure to keep the travel between 90-110% for best performance. If too low, increase mechanical gain by using an outer hole on tail servo horn. If too high, use more inner hole. |
01-31-2015, 12:13 PM | #19 (permalink) | |
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Only helies i put right not until the limit are those with too much aerodynamicall travel which might stall the blades like the compass hv7 and the logo. Sk center is not the logical center which is roughly where the blades are in a hover. so generally you need to have more right than left and usually what i get is +-(90/110).
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2 X X7 | Scorpion 4525 Ultimate 4+6T YY / Xnove 4530 525 | scorpion Tribunus 200II ESC | Edge 713 | Logo 690SX | Pyro 440 7+8T YY | Castle 120HV | X3 | 4S | HW 50A V2 ESC | Scorpion 2221 2050KV 9T D | SK540 / Brain2 | Mks |
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01-31-2015, 02:44 PM | #20 (permalink) |
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As i said: 'if you wish' and same mechanical travel from center point doesn't mean same numbers left/right in the SK . All really depends on the mechanical geometry of the heli tail (all are not equal/built with the same mechanical precomp or sometimes none). Example: Warp 360, you don't need the full travel - also called in the Warp manual.
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