sireric
11-03-2006, 01:53 PM
Hi.
Well, I crashed my CCPM 450 after about 50 flights, while doing low height figure 8's. I actually broke a lot of the head elements, the main body and rear boom/tail assembly (almost cried). So I'm rebuilding using a CF body and mostly metal head/tail pieces. It's pretty much an SE now. The servos have a single link direct to the swashplate, in a CCPM fashion and they sit horizontally just below the plate in the top of the CF body.
I've made the body and installed servos (still using HS55). I've leveled the swashplate in all pitch positions, by mechanically leveling at middle sticks and setting end points at extremes (per video).
However, when at the lowest pitch (left stick), if I push the right stick down all the way too (basically, the rear servo is already low and I ask it to go lower), the servo is straining. In a similar manor, if I go full pitch and I push the right stick all the way up, the servo is straining again.
I've tried reducing the swash pitch gain from ~60% to ~25% to remove the servo strain. However, when I do that, I don't get a lot of travel from the swashplate, from going from lowest to highest pitch with a centered right stick. So:
1) Is it better to have a lot of swashplate travel but limited forward/reverse at extreme pitch levels (I can just "avoid" those places)?
2) Or is it better to have limited swash plate travel but allow for the max pitch+forward to go to the limits of the servo? Same for min/reverse.
2) Should I consider different servos, though it would seem to me that all should do this?
3) Is there some mechanical change I could make for this?
Thanks any advice!
Well, I crashed my CCPM 450 after about 50 flights, while doing low height figure 8's. I actually broke a lot of the head elements, the main body and rear boom/tail assembly (almost cried). So I'm rebuilding using a CF body and mostly metal head/tail pieces. It's pretty much an SE now. The servos have a single link direct to the swashplate, in a CCPM fashion and they sit horizontally just below the plate in the top of the CF body.
I've made the body and installed servos (still using HS55). I've leveled the swashplate in all pitch positions, by mechanically leveling at middle sticks and setting end points at extremes (per video).
However, when at the lowest pitch (left stick), if I push the right stick down all the way too (basically, the rear servo is already low and I ask it to go lower), the servo is straining. In a similar manor, if I go full pitch and I push the right stick all the way up, the servo is straining again.
I've tried reducing the swash pitch gain from ~60% to ~25% to remove the servo strain. However, when I do that, I don't get a lot of travel from the swashplate, from going from lowest to highest pitch with a centered right stick. So:
1) Is it better to have a lot of swashplate travel but limited forward/reverse at extreme pitch levels (I can just "avoid" those places)?
2) Or is it better to have limited swash plate travel but allow for the max pitch+forward to go to the limits of the servo? Same for min/reverse.
2) Should I consider different servos, though it would seem to me that all should do this?
3) Is there some mechanical change I could make for this?
Thanks any advice!