throttle & pitch curves

throttle & pitch curves

Post by The_ » Fri, 06 Jul 2001 21:43:01



when I have the idl-up switch set to Normal, and the stick at idle, I have 2
deg. negative pitch, and when at full throttle, it's +8 (from the manual of
the Nexus). To acheive this, I have these values on the curve:
pos. 1 - 0%
pos. 2 - 25%
pos. 3 - 50%
pos. 4 - 57%
pos. 5 - 60%

Something tells me this might not be correct?

Any advice much appreciated!

--
The_1
--
http://home.online.no/~joha-fo/nexus

 
 
 

throttle & pitch curves

Post by The_ » Fri, 06 Jul 2001 21:45:01


I forgot, I have +6 deg. pitch at mid stick. And change that to +9 at full
open.

--
The_1
--
http://home.online.no/~joha-fo/nexus

 
 
 

throttle & pitch curves

Post by MacGyve » Sat, 07 Jul 2001 17:55:00


-2/+6/+9 seems OK to me...

Mac.
http://egnatia.ee.auth.gr/~kosmour

The_1 and only wrote ...

Quote:
>I forgot, I have +6 deg. pitch at mid stick. And change that to +9 at full
>open.

>--
>The_1

 
 
 

throttle & pitch curves

Post by The_ » Sat, 07 Jul 2001 20:28:09


yeah, thanks Mac!

I was kinda wondering if the values on my pitch curve was correct, or okay?
I was out flying yesterday, and I had troubles finding a constant
head/engine speed.
A little advise or help on setting up the curves would be much appreciated!
:)

--
The_1
--
http://home.online.no/~joha-fo/nexus


Quote:
> -2/+6/+9 seems OK to me...

> Mac.
> http://egnatia.ee.auth.gr/~kosmour

 
 
 

throttle & pitch curves

Post by MJA » Sat, 07 Jul 2001 21:34:59


Quote:

> yeah, thanks Mac!

> I was kinda wondering if the values on my pitch curve was correct, or okay?
> I was out flying yesterday, and I had troubles finding a constant
> head/engine speed.
> A little advise or help on setting up the curves would be much appreciated!
> :)

If you've got +9 degrees with the top pitch value set at 60% it sounds like you
could have the pitch range "mechanically" advanced way too far by way of the
blade control links,or your collective ATV's are a long way different .

Centre the collective stick and reset all the pitch curve values to
0,25,50,75,100.Set both collective direction ATV's roughly the same, + or - 10
is ok ,but you don't want like a difference of 30 or more  %,set the pitch
slider roughly at half it's travel on the mainmast.put the servo arm on the
servo so the linkage meets at  roughly at 90deg to the arm.With collective
stick still centred  set the pitch on a blade with the blade operating link so
that it's about +4 deg when read off a pitch gauge (or one of those cardboard
efforts)..Remember how many turns you used (in or out)and set the other blade
link the same

This should give a range of about -6 to +10,depending how long the collective
servo arm is and how much ATV you've set.

All being well your new pitch curve might end up to be 20,40,60,80,90 for a
range of -4low +6mid and +9high.

 This is assuming that you don't want a 0deg centre collective setup

Martin

 
 
 

throttle & pitch curves

Post by The_ » Sat, 07 Jul 2001 23:05:43


Quote:
> If you've got +9 degrees with the top pitch value set at 60% it sounds
like you
> could have the pitch range "mechanically" advanced way too far by way of
the
> blade control links,or your collective ATV's are a long way different .

> Centre the collective stick and reset all the pitch curve values to
> 0,25,50,75,100.Set both collective direction ATV's roughly the same, +
or - 10
> is ok ,but you don't want like a difference of 30 or more  %,set the pitch
> slider roughly at half it's travel on the mainmast.put the servo arm on
the
> servo so the linkage meets at  roughly at 90deg to the arm.With collective
> stick still centred  set the pitch on a blade with the blade operating
link so
> that it's about +4 deg when read off a pitch gauge (or one of those
cardboard
> efforts)..Remember how many turns you used (in or out)and set the other
blade
> link the same

> This should give a range of about -6 to +10,depending how long the
collective
> servo arm is and how much ATV you've set.

> All being well your new pitch curve might end up to be 20,40,60,80,90 for
a
> range of -4low +6mid and +9high.

>  This is assuming that you don't want a 0deg centre collective setup

> Martin

sweet! :)

How about the curve, should it be linear or "wavy"?

The_1

 
 
 

throttle & pitch curves

Post by MJA » Sun, 08 Jul 2001 00:04:37


Quote:

> > All being well your new pitch curve might end up to be 20,40,60,80,90 for
> a
> > range of -4low +6mid and +9high.

> >  This is assuming that you don't want a 0deg centre collective setup

> > Martin

> sweet! :)

> How about the curve, should it be linear or "wavy"?

> The_1

I made a balls up there,it should have read 20,40,60,75,90 :-)

Ideally the response you get should be linear ,but sometimes the values can't
be.It depends what "you" want really,strictly speaking any setup where you hover
with +6 degrees midstick ( usually = with lowish headspeed) but also want -3 or
-4 at low stick
is always going to be  courser on the low half of the stick so all those  points
are better to be evened out  .You  can make the 2nd and the 4th point nearer to
the midpoint value for smoother height control around the hover but at the
expense of the last 3/4 to full stick response being courser,which for general
flying doesn't matter quite as much as it's used for climbout or a quick
collective transition  .At any rate the 8 channel 5 point curve radios's don't
have enough points on the pitch curve to do anything too fancy.  The pitch
points at the radio might be linear but it doesn't automatically follow  the
collective response is going to be,in the case of a -4low +4mid and +10 high
setup (available mechanically before any pitch curve mods)there's  8degrees
below half stick and  6 above it.

Martin