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Old 01-07-2009, 08:34 AM   #1
GCK
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Default CX450SE V2 setup?

This probably is not the right forum to post this. But since there is not a Copter X section and Iím sure some of you guys have this helicopter I figured what the heck.

I got a CX450SE V2 for Christmas. So far Iíve equipped it with a 40A Hobby wings ESC, Align 430XL motor with 11 tooth pinion, external 3A switching BEC, SG90ís on the swash, and an AR6200 receiver to go along with my DX6i. I plan on using a GY401 gyro and a decent tail servo but Iíve yet to pick that up.

Iíve mounted the servoís (pain in the butt) and went through the entire head setup based on Finless Bobís videoís (CCPM part 1/CCPM part 2). Everything went well all though Iím sure if I built another one I could do it in half the time. I have the collective pitch set to +/- 10 degrees. I can easily get +/- 12 degrees but I figured 10 is good for now. And Iíve set the cyclic pitch to +/- 7 degrees. I noticed in Bobís video that his swash mixes are around 50 or so for pitch and around 60 or so for aileron and elevator. On my setup Iím at Ė85 on pitch and 95 for aileron and elevator. Is this just the difference of the servoís and my radio? Or did I miss something and need to go back through my setup? Everything seems to be working just fine. Iím just curious as to why my swash mix settings are so much higher then Bobís. And Bob is running +/- 11 degrees collective and +/- 8 degrees cyclic in the setup videos.

Thanks for any input.

Greg
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Old 01-07-2009, 08:58 AM   #2
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Your mix percentages are way too high. There is definatly a problem somewhere.

I am not an expert on swash mixes but maybe you swash was too low from the start. Try and lower your pitch % and higher your swash useing the links. Turn them all two turns, then 3 or 4 turns until you get 0 pitch at mid stick with 60% pitch.

If you do that then maybe all your other values will need to come down too. So lower your aile and elev to 60% aswell.

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Old 01-07-2009, 09:05 AM   #3
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I have zero pitch at mid stick regardless of the swash mix setting for pitch. Only thing changeing the pitch setting does for me is change my pitch range.
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Old 01-07-2009, 11:44 AM   #4
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Hi Greg,

Good choice of forum as a lot of us have CopterX's or hybrid belt copter x/exi/trex!

I agree with Jonny, your mix settings seem insanely high. I am getting +/-11 on my CopterX V2 with just 60% swash mix and get +/-6 cyclic with 60%. When you say you can easily get +/-12 do you mean by increasing swash mix pitch setting?

I would guess that you need to move the ball out on your servo arm and reduce the swash mix down. Which hole do you have the ball in?
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Old 01-07-2009, 11:53 AM   #5
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I'm on the third hole on the SG90 servo arms (about 13mm from center). Arms are centered at zero stick. The links are at 90 degrees with the servo arms at mid stick. The swash plate is 10mm from the bearing block at mid stick. Plenty of room on the swash to move +/-12 degrees collective pitch. I do have the swash mix for pitch set to limit the pitch to +/- 10 degrees though. Everything I can think of in my setup looks right. Its acting like these SG90 servo's just don't move as much with a given swash setting. If I move the ball link further out on the servo arm it won't be 90 degrees anymore. What servo's are you using?
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Old 01-07-2009, 11:54 AM   #6
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+1 with Psilo
My balls are (and I am sure I am going to regret this) at about 12mm out of the center

Yep too late
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Old 01-07-2009, 11:57 AM   #7
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I had a friend with that problem too!

Seriously though, have you got any Dual Rates setup or have you reduced the travel adjust on your servos? Admittedly, I am using HS65MG's on mine so not the same setup but have SG90's on the belt with 60% across all swash. As you say, sounds like your setup is indeed correct, Very strange!

Edit: Perhaps you could increase the ATV's for the servos to get more throw, although I guess not much different to adjusting the mix?!
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Last edited by psilo; 01-07-2009 at 11:59 AM.. Reason: Another thought!
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Old 01-07-2009, 11:58 AM   #8
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maybe a dumb question but is the travel limit ( I have a futaba so I don't know how it is called on the DX6) at 100%

Yep too late again
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Old 01-07-2009, 12:00 PM   #9
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Great minds Erwin!
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Old 01-07-2009, 12:00 PM   #10
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Old 01-07-2009, 12:08 PM   #11
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I am in hole two of my servos, which are of HS65MGs on an EXI, but it must be somewhat similar.

I get +-10 with this setup and the pit is only at 55, so I agree that I think something must be wrong somewhere.

Maybe some photos would help us. Are you able to post some?
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Old 01-07-2009, 12:20 PM   #12
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I have SG90 arms on my EXI, and I'm on the second hole from the end of the arm for 13 mm... The third hole gives me just over 9 mm. I don't see any of the other arm styles getting close to 13 on the third hole either. Did you measure center to center?

If the ball is 4 mm shy of 13 mm, there's nothing strange about those swash settings. Even at 13 mm, I can get up to 105% pitch, 85% elevator and 75% aileron with no binding.
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Old 01-07-2009, 12:33 PM   #13
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Mine are in the second hole's too

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Old 01-07-2009, 12:44 PM   #14
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There are no dual rates set that Iím aware of. Started with a new model set and did not copy anything over. The travel adjusts for all the channels are at 100%. I did think about increasing those but came to the same conclusion that it would be the same thing only different.

I use the SG90ís on my Belt CP as well and all of the swash mix settings I have are at 65%. Completely different setup though.

When I say my ball links are in the third hole thatís the third hole from center not the end. Seemed to me I had trimmed off one hole on the end of the servo arm so I would be in the second hole from the end. And everything seems to be spot on other then the swash mix settings are so high. Since this is my first complete helicopter build I thought I would ask just incase I missed something. If not like I say the only thing I can think is the SG90 does not have as much throw as some other servos for the same swash mix setting.
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Old 01-07-2009, 01:54 PM   #15
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Quote:
Originally Posted by GCK View Post
When I say my ball links are in the third hole thatís the third hole from center not the end.
That's what I figured, but on the arms I'm looking at the second from the end is the fifth from center... Anyway, your swash mix settings don't sound too strange for SG90s, so if you get straight throws and the pitch range you need, I don't think there's anything to worry about.
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Old 01-07-2009, 02:09 PM   #16
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I agree Mika, I guess if the setup is sweet and it works, then it works. The reason I thought there must be something going on is that I have never had to go over 65 on pit, and have always aimed for +-10, whether it was with SG90s on the Belt, with or without DTS mod, or with the HS65s on the EXI, with the links at normal type distances out.

I suppose, as I think you were concluding anyway, and like Mika said, there is nothing to worry about.
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Old 01-07-2009, 02:10 PM   #17
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Thanks a bunch guys! I will check my servo arms again when I get home tonight just to make sure I have the 13mm from center to the ball link like I've been saying I do. If that's the case then I'll chalk it up to it being the servos and run with it.
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Old 01-07-2009, 05:42 PM   #18
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Well I rechecked my servo arms. Iím not completely crazy as I did place the ball link 13mm from center as I said. But itís in the 5th hole from center not the 3rd as I was saying. So given that Iím all out of ideas other then to say these SG90ís donít have the same throw as some of the other servoís people are using on the swash.
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Old 01-07-2009, 11:01 PM   #19
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Yep, it's just the servos. If you're on the fifth hole, our setups are essentially identical. I just dialed your swash settings in my X9303 and I get very similar pitch, so it looks like you're good to go
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