Raptor pitch servo setup query

[Suzuki_kid_1984]

Hi folks,

I'm trying to setup my raptor pitch servo as per the manual and also using Rays authoratative dvd series.

As im a beginner im going with the +10 & -2 settings, but im strugging to figue out the servo travel % in order to achieve the pitch settings.

When using the manual specified push rod length im finding that in order to achieve the right pitch setting (im trying to align the marker on the collective arm to the built in pitch gauge on the frame) that the high end servo % is say 95, but the low end ends to be dialed down to say 45..

I've interpreted from the dvd series that its good practice to have both servo travel %'s the same.. so im somewhat confused as to how I achieve the +10 & -2 settings.

Am i missing something obvious?

[helijohn]

I would personally not bother with the markings on the heli............I never have!! The ray's is excellent, you should follow that to the letter. You should initially forget about worrying over the -2° -ve pitch while setting up at this stage. Set the max and mins at around +10 to -10 with the swash level at zero and nice orthogonals at the pushrods. Once done you can dial in your beginner's minimum of -2 or such in the radio pitch curve later.
Hope this helps.

[Suzuki_kid_1984]

Thanks helijohn, does make sense what your advising. Was getting so obsessed with setting it up using the servo travel i forgot to think outside the box and use the pitch curve!

[helijohn]

Thanks helijohn, does make sense what your advising. Was getting so obsessed with setting it up using the servo travel i forgot to think outside the box and use the pitch curve!

Welcome.

Also you can much later reset the pitch in the radio to -10° if you need it.

[Hummingbird]

Don't forget the swash movement - and pitch - is also adjustable in your transmitter swash mix menu

[GIXERMAN]

Don't forget the swash movement - and pitch - is also adjustable in your transmitter swash mix menu

Not if it is a old style raptor there 1 servo 90, which means swash mix is not in use.

[Hummingbird]

Sorry, I stand corrected!

[Suzuki_kid_1984]

Thanks all for the input over the last few days. It's a 50 titan so has the push/pull system above the pitch servo.

Finally managed to get my head around the issue i think. Set it up for +10 and -10 on the servo travel, then messed about with the pitch curve in the TX to obtain the -2 low end. The curve does look a bit odd in that the L point is set at 48% and H is 100% and points 1, 2 and 3 adjusted to make a linear line. (I have 5 point curves)

After watching the Ray's DVD over and over I'm all set up, but did want to check the following with you all, if I may!

When setting up the throttle travel adjust on the servo I struggled to obtain 50% carburettor opening at 66% stick input, So rightly (or wrongly) I messed about with the throttle curve.. I had the curve previously set linear, 0% at point L and 100% at point H, but found I actually needed to reduce the servo output slightly at around points 2 and 3, to get the carb set at about 50% open.. trust this is ok? It does mean that when running from low to high stick you visually see the servo slowing in travel around mid stick, then producing a faster rate of travel from just above mid stick to full stick (as you would expect because of the curve)

Is this ok? I'm obsessing a bit as Ray's dvd bangs on about keeping the pitch / throttle curve linear for consistent output throughout the stick range.

[helijohn]

Thanks all for the input over the last few days. It's a 50 titan so has the push/pull system above the pitch servo.

Finally managed to get my head around the issue i think. Set it up for +10 and -10 on the servo travel, then messed about with the pitch curve in the TX to obtain the -2 low end. The curve does look a bit odd in that the L point is set at 48% and H is 100% and points 1, 2 and 3 adjusted to make a linear line. (I have 5 point curves)

After watching the Ray's DVD over and over I'm all set up, but did want to check the following with you all, if I may!

When setting up the throttle travel adjust on the servo I struggled to obtain 50% carburettor opening at 66% stick input, So rightly (or wrongly) I messed about with the throttle curve.. I had the curve previously set linear, 0% at point L and 100% at point H, but found I actually needed to reduce the servo output slightly at around points 2 and 3, to get the carb set at about 50% open.. trust this is ok? It does mean that when running from low to high stick you visually see the servo slowing in travel around mid stick, then producing a faster rate of travel from just above mid stick to full stick (as you would expect because of the curve)

Is this ok? I'm obsessing a bit as Ray's dvd bangs on about keeping the pitch / throttle curve linear for consistent output throughout the stick range.

Sounds about right to me. I concentrate on getting the throttle servo set so the carbie is at mid setting at mid stick or ¾ stick depending on your preference and pushrods at 90° (I tend only to eye it for 90) with equal throw on either side. Throttle curve isn't a curve just now, it's a straight line. I tend to prefer a fast throttle too. The end points ought to be equal - avoid stuff like binding, stalling etc.

Once all the mechanical faffing on is done and it can take ages particularly getting the throttle arm set nicely, it is as you say all down to setting the throttle curve to where you want it. You've got starting settings and so on to dial in. And your linear may be a weird curve especially as a beginner.
Once you've got this done it'll be a cinch to make slight alterations as you feel you need to, say at the field. When I've done that I tend not to worry about what the curves look like, I just move parameters to get the responses I want. Sometimes more throttle in relation to pitch or whatever.

Then there is the setting for 3D but it's all in the Ray book.

[Suzuki_kid_1984]

That was exactly my thoughts. I Set the push rod so at 66% stick it's @ 90 degrees to the servo arm, with equal travel in both directions. It was this setup that was causing the carb to align at more than 50% open at 66% stick.

Sounds like I'm on the right track, just managed to read a good sticky in the setup page, which does tend to confirm what I'm putting down here.

Like you say may just need some adjustments at the field.