question about end points

[perry59]

After much procrastination I finally got my first heli (trex450) set up.
Took it over to my LHS (deetee) for them to look over. Dennis said I did a great
job and he wouldn't change a thing. Yahoo! all those finless vid's and the freak
were a huge help!:noteworthy
After playing with my DX7 some more though I found that the endpoints (ATV's?) go all
the way to 150 rather than 100 which they are set at now (and the swash mix at 60%)
Do futaba or other radios max out at 100 for their endpoints?
From what I understand so far, when setting up a heli you want all endpoints at 100%
(or full travel?) so should I set all my endpoints at 150 (or just before binding) and re-adjust the swash mix? I assume that changing the endpoints will affect the swash mix and that if they increase significantly then I will have to decrease the swash mix, is this true?
Thanks freakers!

[cbflys]

You're enpoints should always start out at 100%. This is ideally where you want to be. It translates into 60 degrees of servo rotoation. Moving both endpoints to 150% will result in 90 degrees of servo rotation.

The further away from center the servo arm moves, the less pushrod throw you get per degree of rotation. The pushrod is essentially experiencing positive expo (more movement around center), so you can use negative expo to help return linearity (with respect to the control stick position) to the pushrod movement.

Of course there are always exceptions to the rule. For example, if you use a gyro on the rudder channel, you're endpoints control the piro rate, not the servo throw. If you're using and ESC, sometimes the throttle channel endpoints need to be increased in order for the ESC to work propoerly.

[Pinecone]

On a plank you will use endpoints higher or lower to adjust control throw.

On a heli, yo uadjust control throw with the swash mix (CCPM heli) and leave the endpoints alone.

What you can do, is to make sure all three servos have matching thros, and adjust that with endpoints. See the Finless CCPM 2 video on adjusting out interactions.

[perry59]

I always thought that 100% meant (maxium/all the way baby/no mas). Guess I'm nerdy that way. To me 100% means you got it all and no more is available!
So when finless and others say to set your endpoints at 100% they do NOT mean to max out the travel in the radio? You would only go over 100% if you have some kinda servo issues where 100% wont drive them to 60 degrees?
Do other radios go up to 150% in their ATV's?
If some radio max's out at 100% but you still dont have full travel, then what?
Just curious, still learning.
Thanks

[Pinecone]

Don't forget we run MIXES for the swash. So wehn you mix together two channels, it can add up to more than 100%. Or adding subtrim and trim to a channel. But on non-mixed channels, like the throttle, it can be nice to be able to add a bit of throw one way or the other to not have change the linkage.

it is convenience thing.

[cbflys]

Along those same lines, be careful when using 'sub-trim' and 'end points' together. With a large sub-trim offest and expanded endpoint settings, it's possible to run into the servo's electrical and/or mechanical limit. When that happens, things won't work the way you expect.

[Pinecone]

Yes, and that is why it is best to run the MINIMUM subtrim possible, by first trying all the servo horns in all orientations.

I found that on one heli, if I swapped horns from one servo to another, I ended up with 0 subtrim. Each horn and each servo is slightly different.

[widower]

I thought the servo and horn was the same. If you rotate the horn 180deg you will get a different offset.

[cbflys]

When Pincone mentions the servo, I'm sure he's referring to the output shaft.

You're correct that when you rotate the servo's output arm on the shaft, you'll reallize different offsets. But you always have the possibility that the center position across different servos will not be exactly the same.

[perry59]

do other radios go up to 150 on their endpoints?

[Pinecone]

And different servo horns have slightly different spline offsets. They come out of different molds.

And some radios only go to 125%. But every computer radio I have played with goes above 100%.