Pitch Issues
 

I'm still pretty new with helis, I'm just now getting comfortable with FF. One thing that concerns me is that with my pitch servo travel at 100% I'm only getting a range of 11 degrees (-1,+10)on my Raptor 30. Most guys get 18+ I think. Do I just need to make the travel adjust more than 100%? Also, If I have more negative pitch but the same throttle curve wouldn't that make for blazin' head speeds? Also, I'm about ready to set up an Idle Up mode. If I have about -4,+9 and more throttle on the low end it seems I run into blazin' head speads again???

Pitch Issues
 

Hi volare,

This is the setup I run on my rappy, -4 +6 +10 with a head speed of about 1550rpm at hovor. Your throttle curve at this point is based on your pitch at hover, so if you want more neg pitch then all you will need is to reajust your atv's. This shouldn't change your curve because the servo still knows where center is and the curve is based on center for hover. I was able to get this set up with my atv's and the manual setup in combo. by using center stick as a hovor point, I can also change it with my pitch curve and my hovor pitch settings in my radio.

Your rpm's will rise when you come down in pitch due to the lack of load on the engine and at this point shouldn't be a concern unless the head speed in at an uneceptable rate, in fact for myself the higher head speed is benificial because it raises the ETL (efective transational lift) with forward movment.

When you set up your idle-up the rpm's will raise for the same reasons as above with one diferance, the idle-up is set up with a percentage of throttle thus 50% meaning the servo will travle to 50% and hold it there when the throttle stick is moved down past center but the rpm's will still be based on what ever you have for a throttle curve at min stick. My idle-up is at 47% and my throttle curve on idle-up1 is 45-45-47-75-100. The best thing to do is set up your idle-up and find that happy medium that makes you comfortable. Your rpm's should be around 1500 to 1600 at hover and will raise a little when you come down in pitch and you can use your throttle curve in idle-up to achieve the rpm's you want. The way I was able to control some of the raise in rpm's was to drop the first two points on my curve to 45%. When I start doing some iverted flying this setup will change.

Someone please help me out here in case I've got the wrong idea about curves.


Hope some of this helps.

Heli on,
Shannon

Pitch Issues
 

Sounds like you may need a longer arm on your pitch servo, or just move the ball out on the one you have if you can.

Pitch Issues
 

Thanks guys,

You cleared up many things for me. All of me linkages are still as the manual says, I think, but I'll check that out.

Pitch Issues
 

Volare,
One thing to check is to make sure you are using the inner hole on the collective arm, the one toward the back of the heli. This is the big arm that moves up and down. Without your collective servo hooked up to the hole closest to the back, you can't get the full -+10 degrees you are looking for. This is also documented under the changes on Ace's website for the 3D linkage setup.

One thing that is not mentioned on Ace's site is this. If you do use that back hole, your linkage from the servo is no longer vertical but at a slant.

To fix this, first write down all your pitch settings as this will change them and you must fix after doing this.
Flip your servo over so the horn is to the back of the heli and reverse the direction of the servo travel also. Redo your pitch settings and have all linkages in center travel at 0 degrees. Bingo, a nice straight linear linkage again with -10 to +11 capability.

Dwayne.

PS - You should not have to go over 100% travel on any servo if your linkages are "by the book" to achieve -10 to +11. You only have to set them up the "3D way" as documented in the manual and Ace's website.