Post by qmaverick on Dec 17, 2011 10:46:19 GMT -4
Note: I do not know the policy on using pics and items not RCA related, but I use a CopterX multiblade rotorhead in this post, if this is not done, I expect the mods to correct it....
Multiblade rotorheads can be flown without a 3 axis gyro, in order for this to work you need "phasing", on a flybared heli the flybar takes care of the phasing.
Since no flybar is present on a multiblade head, here is a little bit of the theory and the solution on how to make it fly.
"CopterX (CX450BA-20-01) RIGID Three Blades Main Rotor Set for 450 Heli"
A little bit of theory, why you need phasing. When you have a spinning top spinning on the table in front of you and you push it with your finger, the spinning top will move away in a direction 90 degrees on the direction you pushed it in. The rotor disk of your heli reacts the same way, normally the flybar and paddles compensate this, but since we do not have a flybar and paddles on a multiblade head we have to find another solution. Basically you have to let the rotordisk "think" that the push comes from a 90 degrees angle to get the result you want.
The way to set up the CopterX 3 bladed head is very easy, once you know what the solution is. You put one blade over the tailboom, and then you make certain that the ball on the swash plate ring where the pushrod from that one blade goes to is at 90 degrees to the left (90 degrees to the right if you have a rotorhead spinning ccw), then tighten the anti rotation collar. This is all when you are looking at the heli from the back... The phasing is now correct.
Be warned though, when you are spooling up the rotor, the phasing is still 90 degrees off... When the heli starts to slide to the left, and you try to correct by steering to the right, the heli then will want to tilt forward, you correct by tilting backwards and then the heli will tip over to the left... I had the rotorblades scrape the floor fives time before I figured this one out. You'll need to tilt forward to get the required response from the rotor.
This is normal behaviour for a multiblade rotor if I understood correctly.
On a multiblade rotorhead you have a fixation collar aka Multiblade Rotor Head Follower:
This fixation collar you can turn around, when you do, the swash plate ring turns with it, when you find the sweetspot, you tighten the collar and the swash plate ring is fixed on the mainshaft rotated at an angle to the rotorhead.
Wished I had seen this picture earlier, this shows it beautifully... You see the blade holder going to the right and towards you, when you follow the pushrod down you'll see that it is fixed on the swash plate ring on an approx. 90 degree angle to the blade holder... When the swashplate plate is moved upwards on that spot the bladeholder trailing at 90 degrees will rotate and presto, the rotordisk will respond the way we want it.
This is true for 3, 4 and 5 or even more blade rotor heads, pick one blade and rotate the collar so that the swash plate ring where the pushrod goes to is at 90 degrees to that blade...
I hope this info will be of use to you someday.
Multiblade rotorheads can be flown without a 3 axis gyro, in order for this to work you need "phasing", on a flybared heli the flybar takes care of the phasing.
Since no flybar is present on a multiblade head, here is a little bit of the theory and the solution on how to make it fly.
"CopterX (CX450BA-20-01) RIGID Three Blades Main Rotor Set for 450 Heli"
A little bit of theory, why you need phasing. When you have a spinning top spinning on the table in front of you and you push it with your finger, the spinning top will move away in a direction 90 degrees on the direction you pushed it in. The rotor disk of your heli reacts the same way, normally the flybar and paddles compensate this, but since we do not have a flybar and paddles on a multiblade head we have to find another solution. Basically you have to let the rotordisk "think" that the push comes from a 90 degrees angle to get the result you want.
The way to set up the CopterX 3 bladed head is very easy, once you know what the solution is. You put one blade over the tailboom, and then you make certain that the ball on the swash plate ring where the pushrod from that one blade goes to is at 90 degrees to the left (90 degrees to the right if you have a rotorhead spinning ccw), then tighten the anti rotation collar. This is all when you are looking at the heli from the back... The phasing is now correct.
Be warned though, when you are spooling up the rotor, the phasing is still 90 degrees off... When the heli starts to slide to the left, and you try to correct by steering to the right, the heli then will want to tilt forward, you correct by tilting backwards and then the heli will tip over to the left... I had the rotorblades scrape the floor fives time before I figured this one out. You'll need to tilt forward to get the required response from the rotor.
This is normal behaviour for a multiblade rotor if I understood correctly.
On a multiblade rotorhead you have a fixation collar aka Multiblade Rotor Head Follower:
This fixation collar you can turn around, when you do, the swash plate ring turns with it, when you find the sweetspot, you tighten the collar and the swash plate ring is fixed on the mainshaft rotated at an angle to the rotorhead.
Wished I had seen this picture earlier, this shows it beautifully... You see the blade holder going to the right and towards you, when you follow the pushrod down you'll see that it is fixed on the swash plate ring on an approx. 90 degree angle to the blade holder... When the swashplate plate is moved upwards on that spot the bladeholder trailing at 90 degrees will rotate and presto, the rotordisk will respond the way we want it.
This is true for 3, 4 and 5 or even more blade rotor heads, pick one blade and rotate the collar so that the swash plate ring where the pushrod goes to is at 90 degrees to that blade...
I hope this info will be of use to you someday.