9C supper throtle and elevator mix ?
09-23-2006 | 12:56 AM
#1
Thread Starter
Senior Member
9C supper throtle and elevator mix ?
My trainer is very sensitive to throtle. Trimed at mid range, I cut the throtle and the nose pitches over and I start dropping, If it go to max throtle, the nose lifts and I really start climbing.
I thought I could do a mix between throtle and elevator, IE as the throtle closed, there is more up elevator trim and visa versa. I set up Prog. Mix1 up so throtle is master and elevator is slave, controled by switch A. Now I get confused, There is a "Rate" on page 1/2 with an up arrow and a down arrow. I am assuming that on the down arrow that if i set the rate to +3%, then when I go low throtle, I'll give the elevator 3% more up trim. I have the up arrow set to - 3%. Do I have the right concept on how this works?
Also, there is an "offset" on this page, it is at 50%. What does this do in my example?
On page 2/2, there is and option for "link", what is this for?
I have gone through the manual and can't find a reference to my questions, although I may be overlooking them.
Thank you for your help
Don.
I thought I could do a mix between throtle and elevator, IE as the throtle closed, there is more up elevator trim and visa versa. I set up Prog. Mix1 up so throtle is master and elevator is slave, controled by switch A. Now I get confused, There is a "Rate" on page 1/2 with an up arrow and a down arrow. I am assuming that on the down arrow that if i set the rate to +3%, then when I go low throtle, I'll give the elevator 3% more up trim. I have the up arrow set to - 3%. Do I have the right concept on how this works?
Also, there is an "offset" on this page, it is at 50%. What does this do in my example?
On page 2/2, there is and option for "link", what is this for?
I have gone through the manual and can't find a reference to my questions, although I may be overlooking them.
Thank you for your help
Don.
09-26-2006 | 11:36 AM
#3
My Feedback: (11)
RE: 9C supper throtle and elevator mix ?
Geistsware is correct. You really need to add a bit of downthrust. Downthrust is used to minimize trim changes when you change power. If the model tends to nose up when you add power, and drop the nose when you cut power, you need to add some downthrust. A mix won't really solve the problem. A correct thrustline will.
To add downthrust, just loosen the engine on its mount, add a small washer under the mount on the mounting bolt on both the left and right side. This will angle the engine down a bit. Tighten the bolts. Fly the model and get it trimmed for level flight at your usual throttle setting. Now play with the throttle to see how it behaves. You may have to add another washer or two.
You can also add downthrust by inserting washers between the top of the mount at the upper mounting screws. Again, a little at a time.
Washers at the top of the mount will tilt the engine less than washers under the mounting lugs of the engine, so you may find a combination of the two will get you so close that the amount of pitch change with throttle change is minimized.
To add downthrust, just loosen the engine on its mount, add a small washer under the mount on the mounting bolt on both the left and right side. This will angle the engine down a bit. Tighten the bolts. Fly the model and get it trimmed for level flight at your usual throttle setting. Now play with the throttle to see how it behaves. You may have to add another washer or two.
You can also add downthrust by inserting washers between the top of the mount at the upper mounting screws. Again, a little at a time.
Washers at the top of the mount will tilt the engine less than washers under the mounting lugs of the engine, so you may find a combination of the two will get you so close that the amount of pitch change with throttle change is minimized.
