Dynamic
06-19-2008, 12:06 AM
Basically we are going to use
Tangent = opposite / adjacent
You gotta figure out how much pitch you want (remeber that you need to add cyclic to your collective pitch to find your totals....so like +|- 14 degrees collective and +|-10 degrees cyclic = 24 degrees positive and negative...I work with right angles to make the math easier 24 degrees which is half of your total pitch)
So now your adjacent is going to be the distance from the middle of the mainshaft to the middle of your ball.
Opposite is going to be the vertical movement required to achieve that pitch. (remeber that we are dealing with half the pitch so its actually twice this, I'm still ignoring this though because we are not done with our right angles.)
Tangent of theta times the distance between the middle of your ball link on your blade grip to the center of your mainshaft equals the vertical distance your link will have to move.
On a 600 we have a push pull system with boost, so we figure out our boost ratio and incorperate it. Take the length of the arm connecting to the swash and divide it by the length from the center of your pivot to the middle of the ball that connects to the server. Multiply your viertical distance (or opposite) by your result. If you heli does not use push pull levers then you can ignore this step.
Now you need to discover how much throw you want on your servo. Lets say 60 degrees total, I'm still only dealing with half the system to keep the math easy so theta (our angle) becomes 30. We use our trig functions again only this time adjacent is our distance from the center of the servo shaft to the middle of your ball link on the servo, and opposite is the vertical distance that we figured out earlier. So opposite divided by the tangent of theta (our angle) will equal the length that our ball should be moved out on the horn from the servo shaft.
Using those steps you should be able to figure out whatever you need.
If you don't have a scientific calculator then your can use an online version here
http://www.mathsisfun.com/scientific-calculator.html
for your trig functions.
Tangent = opposite / adjacent
You gotta figure out how much pitch you want (remeber that you need to add cyclic to your collective pitch to find your totals....so like +|- 14 degrees collective and +|-10 degrees cyclic = 24 degrees positive and negative...I work with right angles to make the math easier 24 degrees which is half of your total pitch)
So now your adjacent is going to be the distance from the middle of the mainshaft to the middle of your ball.
Opposite is going to be the vertical movement required to achieve that pitch. (remeber that we are dealing with half the pitch so its actually twice this, I'm still ignoring this though because we are not done with our right angles.)
Tangent of theta times the distance between the middle of your ball link on your blade grip to the center of your mainshaft equals the vertical distance your link will have to move.
On a 600 we have a push pull system with boost, so we figure out our boost ratio and incorperate it. Take the length of the arm connecting to the swash and divide it by the length from the center of your pivot to the middle of the ball that connects to the server. Multiply your viertical distance (or opposite) by your result. If you heli does not use push pull levers then you can ignore this step.
Now you need to discover how much throw you want on your servo. Lets say 60 degrees total, I'm still only dealing with half the system to keep the math easy so theta (our angle) becomes 30. We use our trig functions again only this time adjacent is our distance from the center of the servo shaft to the middle of your ball link on the servo, and opposite is the vertical distance that we figured out earlier. So opposite divided by the tangent of theta (our angle) will equal the length that our ball should be moved out on the horn from the servo shaft.
Using those steps you should be able to figure out whatever you need.
If you don't have a scientific calculator then your can use an online version here
http://www.mathsisfun.com/scientific-calculator.html
for your trig functions.