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XHELI.COM . Autography FlightPower . Advantage Hobby

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Beginners Corner > Servo Torque?
 
 
nrad2000
Senior Heliman
Location: USA

Why would I want a 300oz torque v.s 70oz torque? Or, why would I want more? For a 50 Size heli - does it require a lot of torque to change pitch on the blades?

If I was descending straight down and suddenly add positive pitch does it require more torque to change pitch v.s if I was hovering and then added pitch?
09-23-2008 02:04 AM
 
 
george0079
Elite Veteran
Location: Terra Firma

Quote 
does it require a lot of torque to change pitch on the blades?

yes.

Quote 
If I was descending straight down and suddenly add positive pitch does it require more torque to change pitch v.s if I was hovering and then added pitch?

yes.

There are a couple of threads in the servo forum about torque vs speed, for various different servos. Really good info.

You think your kids are expensive now?

Just wait until they move out!!
09-23-2008 02:13 AM
 
 
Blade_Master1
Key Veteran
Location: Canada

you don't need a servo of 300oz of torque

is it mccpm or eccpm 1 servo for pitch or 3

find out what your heli weighs
454 grams = 1 pound
28grams = 1 oz

300oz X 28 = 8400 grams/454 = 18.5 lbs of torque
does your heli weigh 18.5 lbs

your pitch servos combined should be rated at 3 times the helis weight for 3D in my books

an 8lbs heli should have 3 times its weight 24lbs of combined servo torque on an eccpm heli
0r 129.71 oz of torque per servo for 3D
or double it weight for sport
86.47 oz of torque per servo

as for speed .15 or less for 3d
.20 or less for sport

JM2C's :)
09-23-2008 05:44 AM
 
 
nrad2000
Senior Heliman
Location: USA

I have both mccpm and eccpm - both are 50 size heli.

No they do not weigh 18.5lbs.

Both mechanics are in a scale fuselage - so, no 3D.

I never really thought about it - but just recently I was curious about the forces involved at the servo arm level. I'm reading some stuff on RR that "Playfair" wrote and find it really interesting.

In a mccpm I'm guessing I need a stronger pitch servo. In a eccpm all 3 are working together to change pitch. But for the aileron/elevator in the mccpm only 1 servo is moving. So perhaps I need a stronger servo for the mccpm in all surface controls.

Both heli's have the 50 hyper/ same muffler/ and same type of blades. Not in the scale fuselage I went flying this afternoon. While hovering I did a full + pitch on both helicopters and the eccpm went up a little quicker (same pitch at the top). So I was just thinking - what kind of forces are involved at the servo arm level. (I know both engines are not exactly identical and both heli's are not exactly identical)

I'm not trying to start an argument/ i'm not a rocket scientist/ I was just curious about the forces involved.
09-23-2008 06:12 AM
 
 
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Beginners Corner > Servo Torque?
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