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CarbonXtreme . Midland Helicopters . HeliProz

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Got Jet Fuel? Turbine Helicopters > Pitch setup
 
 
dacostad
Heliman
Location: Los Angeles, CA - USA

Hi all,

I am in the process in setting up the pitch on my new JetCopter SX.

My typical process is to get the servo arms all at 90 degrees at the center position of the servos (90 to the control rods too) then adjust the "mechanical" pitch range to make it symmetrical, i.e -10 to + 10, then using the TX pitch curve dial in the required up and lower limits.

However, I am not sure that on the Jetcopter that this is correct due to the weight of the helicopter and the fact that I wont be flying any extreme 3D. I think I want a pitch curve that will go from -3 to +10 or 11 and it strikes me that there is a lot of potential servo movement that wont be used (ie from -10 to -3).

Should I really be setting the mechanical pitch range from say -8 to +12 and then dialing that down slightly with the TX pitch curve to -3 to +12.

Opinions and advice please.


Thanks


DAvid

Visit my website at www.scalereplica.com
04-20-2008 09:51 PM
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MattJen
Key Veteran
Location: UK,Gravesend, Kent

you wont need that much negative for a heavy turbine

my curve is -3 to plus 8 or 9

Matt

I bought my Mother-in-law a chair for xmas, but she wouldn't plug it in
04-20-2008 10:33 PM
 
 
chopper jockey
Senior Heliman
Location: uk

read this related topic, it should help you...

http://www.runryder.com/helicopter/t417124p1/
04-20-2008 10:40 PM
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dacostad
Heliman
Location: Los Angeles, CA - USA

Thanks Matt,

so what did you set you mechanical pitch range to before setting up your pitch curve?

Thanks


David

Visit my website at www.scalereplica.com
04-20-2008 11:11 PM
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PETER ROB
Veteran
Location: Devon UK

servo movement that wont be used

dacostad, If you go with the -2, +10, and you still have unused servo mouvement, then move the balls on the servo arms in towards the centre, this will increase your torque and make you use more servo travel
Peter Rob
04-20-2008 11:50 PM
 
 
dacostad
Heliman
Location: Los Angeles, CA - USA

Thanks Peter

Visit my website at www.scalereplica.com
04-21-2008 01:32 AM
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syon
Heliman
Location: tualatin,OR

just out of curiosity

Are you using 3 or 4 servos on your swash control?
(90 degrees in either configuration)

which one works best?

a heli is like a marriage, most of the time it works, the rest it don't.
05-03-2008 02:25 PM
 
 
MattJen
Key Veteran
Location: UK,Gravesend, Kent

just out of curiosity
Are you using 3 or 4 servos on your swash control?
(90 degrees in either configuration)
which one works best?


mmmm, can of worms, this has been debated many times, i fly with both, My comp machine uses 3 servo ccpm, and my turbines all fly with 4 servo's.

As to which is better, mmmm, i cannot tell the difference.

The idea of the 4 servo is if one fails in flight you can get your machine back, 3 servo's your screwed.

4 servo's you used to get a lot of interaction between the servo's at maximum input, but as we fly scale machine and NOT 3D, we are never gonna be at maximum range on the servo to cause any uneccessary wear on the servo's.
Also the new radio's out like the 12FG 14MZ and others all have little mixes to take out any interaction between the 4 servo's.

On a turbine i owuld fly with 4, purely for the safety factor of if one fails,and you have 4 working together pulling and pushing large scale blades.
On normal nitro machines i prefer 3 servo's.

Matt Jenner

I bought my Mother-in-law a chair for xmas, but she wouldn't plug it in
05-03-2008 02:57 PM
 
 
dacostad
Heliman
Location: Los Angeles, CA - USA

Four servos, 90 degree.

David

Visit my website at www.scalereplica.com
05-03-2008 02:58 PM
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PETER ROB
Veteran
Location: Devon UK

3 or 4 ServoCCPM

I am in the process of changing Matts HotCat from 3 to 4 servo CCPM,(90 degrees), (my preference), on really large scale and heavy machines, an extra servo at 13 Kn, is an asset
It probably starts from, when the highest torque servo, was around the 6 Kn, and the balls on the servo arms were as close in as possible now I think you can get even higher torque at plus 20 KN, and longer servo arms, of different materials
I have shown Matt, that if the mechanical setting up, is correct then you do not get interaction between the servo's
Peter R
05-03-2008 04:35 PM
 
 
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Got Jet Fuel? Turbine Helicopters > Pitch setup
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