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HomeScaleAircraftHelicopterScale Model RC Helicopters › Five cnc main rotor head
10-10-2012 02:51 PM  5 years agoPost 21
Double E

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Atlanta, GA

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Cossi,

It sounds like you have performed the proper test for phasing. Unless there are instructions for the head requiring the linkages to be vertical, I wouldn't worry about them being at an angle.

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10-10-2012 04:40 PM  5 years agoPost 22
Mojave

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Palos Verdes, Ca. USA

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If the design of that rotorhead is correct, you should not need that much correction in the driver. I think that you may be getting a little interaction from the cyclic with your thumbs. I learned a little trick from another member. When I do the check out, I raise the aileron expo to a very high number (60% or so). This will limit the interaction of the ail input if you are influencing the stick to either side with your thumbs during the elev check.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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10-10-2012 05:02 PM  5 years agoPost 23
Double E

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Atlanta, GA

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I suspect he could change the angle of the linkage rods by adjusting the lengths but I'm not sure how critical the angle of the linkage rods are so long as they don't bind and are all the same length. If the phasing is correct when he performs the test with a blade directly over the tail boom then he should be fine. Yes, if he suspects that he is getting some aileron interaction then he can certainly use his expo to temporarily reduce the sensitivity.

Did the manufacturer provide any information on the assembly of the head?

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10-10-2012 09:28 PM  5 years agoPost 24
DrRotor

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Auckland New Zealand

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Charles, check to see if the rotor head has instructions that show how it should be set. If they do not then what you have done should be fine.

Easy way to test if the disc (rotor blades spinning) is working in the correct direction is to spool it up slowly but stay on the ground, do not lift off. Gently give forward cyclic (stick)input and watch how the disc tilts. If it moves forward and not to the left or right then you should be able to fly. Also check your blade tracking, tracking is very important.

Pick one blade as your master and put a reflective tape marker on the tip. Then use a bit of red or white tape on the next blade. Spool it up and see if they track inline. If not, only adjust the blade with the red or white tape on it. Once that blade is tracking with the master blade, then move to the next blade and do the same thing.

It is best to get the model flying perfectly before you put it into the fuselage. I would recommend taking it out and setting it up as a normal pod and boom with your 5 blade head and then tune it like that so that if something happens you don't damage your fuselage.

If you get really stuck I will make a video for you.

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10-10-2012 09:32 PM  5 years agoPost 25
DrRotor

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Auckland New Zealand

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I forgot to say that it is very important to make each blade with a number and also mark the blade grips with a matching number.

This is to ensure that every time the blades are put back on that they go back to the exact same blade grip each time. This is key to keeping balance after the machine is finished being setup and tuned.

Full size helicopters are done the same way.

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10-10-2012 09:40 PM  5 years agoPost 26
JoseReyes

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Steilacoom, WA USA

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10-10-2012 10:18 PM  5 years agoPost 27
Mojave

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Palos Verdes, Ca. USA

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In all of their pics, the links to the grips are vertical. Why design a plug-n-play head that still has to be mechanically phased?? I think he needs to make the links vertical and recheck for blade deflection over the tailboom. That's my .02
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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10-10-2012 10:57 PM  5 years agoPost 28
DrRotor

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Auckland New Zealand

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Mmmm such a complex head with all those links.

Charles. Use some calipers if you have some to adjust each pitch link to the exact same length, this will help with blade tracking.

Set your rotor head as per the pictures in the above link and then move a blade over the tail boom and give some forward and rearward cyclic stick to see if it moves. If it does not move then its phased.

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10-11-2012 01:44 AM  5 years agoPost 29
OTCP64

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Balto Md

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I would think that with the phasing below the swash the direction of rotation would be critical.

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10-11-2012 02:16 AM  5 years agoPost 30
JoseReyes

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Steilacoom, WA USA

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If you look closely how the rods are designed, I think it would do just fine reversing the blade grips for a CCW rotation.. unless you see something I'm missing... it would still be the same degrees left or right.. or am I missing something here... it is a very complex swash plate design. The upper part is straight forward, the lower part is not...

OTCP64
I just took another closer look. you are absolutely correct. the lower part of the swash is phased for a CW rotation. it would have to also be reverse, not sure the two come apart.

Jose

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10-11-2012 10:39 AM  5 years agoPost 31
cossi101

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Malta

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Hi Guys
First of all i want to thank you all For beening much of help. I have been a long time in this hobby but this head is a big challenge, because i have emailed cnchelicopter for instruction manual. And he reply to me that the factory did not supllied him with any setup informantion. just photos in his site.I have build a lot of scale fusealages like Bell 412 Turbine, Ecureuil 315 Turbine,
this is my Bell 412 in flight:

Watch at YouTube

This is how i build my toys

Watch at YouTube

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10-11-2012 12:20 PM  5 years agoPost 32
Heli143

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Phenix City, Alabama

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BEAUTIFUL helicopters!!

Roy Mayoral

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10-11-2012 01:20 PM  5 years agoPost 33
Mojave

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Palos Verdes, Ca. USA

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Nice scalers! No worries, the phasing issue gets the better of everyone until they wrap their head around the concept of how it works. If you just remember that every cyclic input (regardless of how many blades are on the head) happens 90 degrees before the intended action, it will be much easier to understand. IE: On right hand (clockwise rotation) the RIGHT Aileron input starts changing the blade pitch when the blade is directly over the tailboom. Which is why we are telling you to check for blade pitch change with elev input with the blade over the tailboom. You should get no pitch change if the phasing is correct.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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10-11-2012 04:12 PM  5 years agoPost 34
coptercptn

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Mesa AZ. USA

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Great JOB!! Nice "fleet"

Home of the "Sea Cobra".....

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10-11-2012 08:49 PM  5 years agoPost 35
DrRotor

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Auckland New Zealand

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Nice machines Charles.

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10-11-2012 09:30 PM  5 years agoPost 36
cossi10

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MLT

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DrRotor
Thanks

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10-12-2012 12:53 PM  5 years agoPost 37
cossi101

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Malta

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Hi Guys
I tought i have phased it. The blade wich is going two the tail does not move when you give forward stick the swash plate it's lining a bit on one side and when you give back stick it lin's onto the other side , it looks like the movement of the swash plate is working in a angle.not horizontalin forward stick. Do you thing i am missing somthing?
Charles

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10-12-2012 11:42 PM  5 years agoPost 38
DrRotor

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Auckland New Zealand

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Its right Charles. It seems the designer of your rotor head has made it this way by the use of those links at the bottom of your swash plate.

Here is a photo of my 5 blade head with a 90 deg phasing from the blade grip to the swash plate.

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10-13-2012 05:34 AM  5 years agoPost 39
cossi10

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MLT

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DrRotor
I have started my rator 50 and spooled with half throtle, when the blades are turning and you can see a shape of the rotor disk, it is there u see that the rotor will lean on one side with some forward stick,
What do you thing i can do?
When i wrote to cnchelicopter for informantion, you know what he said. That is a DIY do it your self head. And i dont thing they flown it yet! Because if they did you will find it on youtube.i hope i did not trow away $650! Cause i have bought 5,4 bladed heads from this guy. Maybe you guys can make work it out.
Charlie

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10-13-2012 07:01 AM  5 years agoPost 40
Mojave

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Palos Verdes, Ca. USA

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PUT THE LINKS VERTICAL and try again... The head already has the 90 degree phasing built in. If it's properly phased the blade over the tailboom will change pitch during right ail input. You can then put a blade directly at 90 degrees to the tailboom on the left side of the heli and give back elevator input and that blade should change pitch.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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HomeScaleAircraftHelicopterScale Model RC Helicopters › Five cnc main rotor head
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