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Title: Behaviour of swashplate Post by: tictoc21 on May 29, 2017, 06:26:45 PM Hi guys I have hk 450 size flybar heli. I have set up the head. Properly according to finless Bob's videos. But suddenly encountered a problem about swashplate leveling. Though I have leveled it through swashplate leveler for 0 degree of pitch by adjusting length of linkage rod and at positive negative pitch by using end points of servo travel. Means it is perfectly leveled .
The problem is, for full forward elevator swashplate should tilt forward but it also moves a very little to right side also. Not to full right side. The linkage rod is at 90 degree to servo arms and servo arms are made horizontal using sub trims. Please help guys. :banghead: Title: Re: Behaviour of swashplate Post by: Swapnil on May 30, 2017, 07:18:37 AM Contact 'Hellyflyer' via pm or otherwise:
http://www.rcindia.org/profile/?u=347 He was online yesterday but might have missed your post... Title: Re: Behaviour of swashplate Post by: saurabhhsrivastavaa on May 30, 2017, 09:00:19 AM As you mentioned that you have a flybar heli, I am assuming that your cyclic servos are directly plugged into the receiver. So, you may wanna check a few things...
1.) Check for trims. If there are any, remove them and re-level the swash with the leveler for 0 pitch with only adjusting the linkages as you have done. 2.) Try not to use any trims or sub-trims at all. Sub-trims are still acceptable to a small extent. Excessive sub trims and trims will cause deviation at max ends. This could be the reason for your problem. 3.) Check for any other mixing on the tx. 4.) Rather than using end point setting for each channel, use the swash mix to retard the movement. Hopefully this is solve your issue. Title: Re: Behaviour of swashplate Post by: swapnilnimbalkar on May 30, 2017, 11:40:29 AM Hi,
Have you flown the heli before? or you are setting it up for the first time? I am not into heli at all and havent flown any before. But I will share little knowledge that I have. There is something known as "Gyroscopic Precession" in helicopter or any rotating disk. If you apply downward force at a point on a spinning disk it will result in downward movement at 90 degrees. Actually I am unable to put it into words correctly. Here is the link that explains this phenomenon very well. So I think your heli is behaving correctly. http://www.copters.com/aero/gyro.html My 2 cents. Swapnil N. Title: Re: Behaviour of swashplate Post by: Hellyflyer on May 30, 2017, 12:13:13 PM Hi,
Just do what Saurabh is saying on the above post. In addition do the following:- 1. Put tx in idle up 1 and bring th stick to center 2. Center servos mechanically as much as possible by Changing/ shuffling servo horns if required. 3. Avoid going into swash mixes, keep that as last option If you can share a video it will be easier for everyone to help you. Thanks Title: Re: Behaviour of swashplate Post by: tictoc21 on May 30, 2017, 12:17:53 PM Thanks guys for the reply soon i will post the video.
Title: Re: Behaviour of swashplate Post by: tictoc21 on May 30, 2017, 02:54:35 PM This is the video. I have just given a full forward elevator but flybar tilt differently. https://youtu.be/LyCvn6Xc0ZA
Title: Re: Behaviour of swashplate Post by: tictoc21 on May 30, 2017, 03:47:00 PM The actual problem what i have found is not related to flybar but may be related to swashplate movement. When I removed rotor head excluding swashplate., At forward elevator swashplate tilts forward but also to a little right side also.
Title: Re: Behaviour of swashplate Post by: tictoc21 on May 30, 2017, 03:58:10 PM According to link its true. But swashplate has two disc where lower part is non rotating. And upper part rotates if it is connected to rotor head through jesus bolt. In my video you can see a rotating disc but when I observe the movement of swashplate without any rotational effect the swashplate is tillted to approx 10 degree to right wth forward tilt.
Title: Re: Behaviour of swashplate Post by: tictoc21 on May 30, 2017, 04:44:18 PM My max trims are +- 12
Title: Re: Behaviour of swashplate Post by: tictoc21 on May 31, 2017, 09:00:59 AM Hi guys
Title: Re: Behaviour of swashplate Post by: saurabhhsrivastavaa on May 31, 2017, 09:55:38 AM From your video, I could only see the flybar tilt to the right. I could not make out if the swash tilted to...
Tilting of the paddles is somewhat normal. The question is that do the servos move and make the swash tilt when you give full forward input? Please answer these... 1.) Does the unwanted tilting happens when the shaft is rotating or even when the motor is off? 2.) Do you see the servos making that movement or is it because of stress and binding? If this happens only when the motor is spinning, then either you have some binding or the servos are weak to sustain the load. I am assuming you have a 120 deg swash setup. I suggest you call me anytime on my phone number in my signature. Let's talk and I will try to help you out. Title: Re: Behaviour of swashplate Post by: tictoc21 on May 31, 2017, 12:21:19 PM From your video, I could only see the flybar tilt to the right. I could not make out if the swash tilted to... Tilting of the paddles is somewhat normal. The question is that do the servos move and make the swash tilt when you give full forward input? Please answer these... 1.) Does the unwanted tilting happens when the shaft is rotating or even when the motor is off? 2.) Do you see the servos making that movement or is it because of stress and binding? If this happens only when the motor is spinning, then either you h From your video, I could only see the flybar tilt to the right. I could not make out if the swash tilted to... 1) this thing happen when rotor is not spinning since it can't be seen hence changed rotor head but same thing happens so I thought the head movement goes through swashplate hence changed the swashplate. But no success. Then replaced servo motor. But again the same thing.Tilting of the paddles is somewhat normal. The question is that do the servos move and make the swash tilt when you give full forward input? Please answer these... 1.) Does the unwanted tilting happens when the shaft is rotating or even when the motor is off? 2.) Do you see the servos making that movement or is it because of stress and binding? If this happens only when the motor is spinning, then either you have some binding or the servos are weak to sustain the load. I am assuming you have a 120 deg swash setup. I suggest you call me anytime on my phone number in my signature. Let's talk and I will try to help you out. 2) the servos are fixed with two side screws hence no movement of servos while giving any of the full input. Title: Re: Behaviour of swashplate Post by: tictoc21 on May 31, 2017, 12:27:27 PM Sorry for double quote.
Title: Re: Behaviour of swashplate Post by: Hellyflyer on June 03, 2017, 08:10:36 PM Your swash seems perfectly fine to me. There is movement seen in the paddle disc. tilts to the right as there are no blades at the moment and not enough head speed which is normal.
Thanks Title: Re: Behaviour of swashplate Post by: tictoc21 on June 03, 2017, 08:20:32 PM Okey I'm trying with blades now!
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