RunRyder - tail rotor pitch...

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Main Discussion > tail rotor pitch...

YSRRider
Key Veteran
Location: Ingleside/Fox Lake, IL

how do you measure tail rotor pitch? instructions for setup on my CSM540 say to set the tail blades at 8 degrees pitch, i've been told just to set the rear pitch lever at 90 degrees to the boom, does that give you 8 degrees pitch?

02-06-2002 Over year old.

ben1000
Senior Heliman
Location: Gilbert, Arizona

Non-adjustable tail rotor

Howdy..

As far as I can see, tail rotor pitch is not adjustable. The linkage from the ball links on the tail rotor to the pitch-slider on the tail-drive axle is usually a fixed piece of plastic, no? So you can't adjust it that way.

On my nexus, I set it up with the linkage at 90 degrees to the tail-servo control wire, as per the instructions. When I flew it, this allowed far more left yaw than right. I had to trim 1/2 way right just to get the heli to stop rotating. I ended up moving the linkage back a little big. It's not perfect, because now there is a little more throw in one direction than in the other, but that's where it centeres with the trim in the middle.

Works for me. By the way, I'd perfom this check with the gyro bypassed, so that it isn't coloring the results. I had to re-trim slightly after I added the Gyro (telebee).

Regards

Ben

02-07-2002 Over year old.

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YSRRider
Key Veteran
Location: Ingleside/Fox Lake, IL

T/R

thats what i meant... the tail pitch lever. on a raptor, with it set at 90 degrees is that 8 degrees pitch?

02-07-2002 Over year old.

ben1000
Senior Heliman
Location: Gilbert, Arizona

If it's not adjustable, does it really matter how many degrees it is? Try to fly it at 90 degrees, and see if it needs adjusting.... Just my 2 cents.

B.

02-07-2002 Over year old.

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RappyTappy
Elite Veteran
Location: Las Vegas, NV

It looks about 8 degrees to me YSR.

Chris
Xero G

Forever Brothers
Mickey Tylo

02-07-2002 Over year old.

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Rotor
Key Veteran
Location: USA

I believe the Raptor has a built in degree measurement. When the arm is set at 90* the correct deflection is already set. The grips are made that way if I remember correctly.........

My motto is this..Fly...Rebuild...Fly

02-07-2002 Over year old.

YSRRider
Key Veteran
Location: Ingleside/Fox Lake, IL

what do you mean its not adjustable, there all adjustable, with the lever at 90 degrees, no you cant adjust the grips seperate from that, what i want to know is, with it set at 90 degrees, is there 8 degrees of pitch to the blades? with the horrible ARF manuel that TT gives you, they dont tell you.. that i could find, my gyro says to set tail blades at 8 degrees of pitch, how do i measure that??

02-07-2002 Over year old.

YSRRider
Key Veteran
Location: Ingleside/Fox Lake, IL

ok now im getting impatient!

a CSM gyro will go in almost any heli, for HH mode, CSM's instructions say to set tail blades at 8 degrees, how do i know that the blades are at 8 degrees pitch with the control lever at 90 degrees to the boom/linkage? it could be 6,7,9 or even 10 degrees of pitch.

02-07-2002 Over year old.

RappyTappy
Elite Veteran
Location: Las Vegas, NV

With the lever at 90 degrees I used my blade pitch. I just drew a imaginary line through the tail rotor output shaft and measured approx. 8 degrees of pitch. I guess I have to repeat myself.

Chris
Xero G

Forever Brothers
Mickey Tylo

02-07-2002 Over year old.

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ben1000
Senior Heliman
Location: Gilbert, Arizona

I don't think you need to measure it. I'd set it to 90, and then hover it. You'll know before the skids leave the ground if it's right on, or just close one way or the other. 90 degrees is the right place to start, and then adjust from there.

8 degrees is probably just an approximate amount, which changes as you increase torque, add forward flight, and such. That's why without HH, you need to add revo mixing, or with HH, the pitch is always being adjusted by the gyro as you add or decrease collective and forward speed.

People may disagree, but I'd set it to 90, and then try to hover it. Then you'll know whether you need to adjust it a little more or less either way.

Best of luck to you,

- Ben

02-07-2002 Over year old.

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YSRRider
Key Veteran
Location: Ingleside/Fox Lake, IL

thats where i have it set. at 90. not all helis may have 8 degrees. offset.

im trying to track down why my heli spins in circles, quite obviously the gyro is dead!

02-07-2002 Over year old.

RappyTappy
Elite Veteran
Location: Las Vegas, NV

or the gyro is reversed.

Chris
Xero G

Forever Brothers
Mickey Tylo

02-07-2002 Over year old.

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ben1000
Senior Heliman
Location: Gilbert, Arizona

2 things about that:

1) Sorry if this is obvious, but make sure your Gyro isn't 'reversed'. Make sure when you turn your heli left (by hand, on the bench), the gyro moves the servo in the same direction as when you move the Tx lever to the right

2)Hover without the Gyro. At 90 degrees, with constant throttle, you should be able to keep the tail fairly steady with the stick near the middle. It's hard with no gyro, but it will tell you if the setting is close to being right.

Best of luck to you...

B.

02-07-2002 Over year old.

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YSRRider
Key Veteran
Location: Ingleside/Fox Lake, IL

i got my raptor setup used.... went through it all got it suitable for some basic FF and took it around, i got into it for about 30 minutes, as i was about 2 feet off the ground hoving, ready to set it down, it started spinning in circles, i took it apart, nothing looks broke, a few people told me to disect it, they had similar probs. initially i though it was due to my batteries being low, that wasnt it, so i went through it all again, still does it. now im poking at horizon hobby to help me. im still screwing with the heli on and off trying to put a finger on it. too cold to test fly it.

02-07-2002 Over year old.

RappyTappy
Elite Veteran
Location: Las Vegas, NV

So why were you asking if there was 8 degrees of pitch at 90 degrees on the lever, if you know the gyro is broken? Obviously the heli was flying fine before. Did you think the blade grips have suddenly shifted pitch?

Chris
Xero G

Forever Brothers
Mickey Tylo

02-07-2002 Over year old.

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YSRRider
Key Veteran
Location: Ingleside/Fox Lake, IL

well after I fiddle f***ed with it all.....

02-07-2002 Over year old.

Scotty740
Senior Heliman
Location: Nashport, Ohio

Fold both tail blades back so they would hit each other at 0 pitch and measure between the ends of the blades. Set them about 1 1/4" apart and you'll be about where you need to be.

02-07-2002 Over year old.

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jetsurgeon
Veteran
Location: Raleigh, NC

Proper Hover Pitch on R30

YS,

After setting up numerous Raptor 30’s for the local guys, and myself I have found you need to set the distance between the tailbox, and the Tail Pitch Control Slider = 10mm.

Just look at the raptor from the tail in, measure 10mm from the right hand side of the tail box, (around where the tail shaft exits the box), to the left hand edge of the Tail pitch control slider.

Since you have the manual here are the part numbers.

Page 12, step 13: #27 BK0047 [ R/H Tail Unit Housing ]
#21 BK0027 [ Tail Pitch Slider ]

If you set this to 10mm, you will be with in ½ turn on your pushrod length, if your servo is at 90 degrees. Test fly it to achieve the last final settings..

Jeff Galford
Pittsburgh, PA

02-07-2002 Over year old.

z11355
rrMaster
Location: 10000 is enough time wasted.

this isn't too much science.

flip the blades over until they form a V

Through some simple math (left as an exercise to the motivated
reader), you'll find that you want about 1.25" or so between the
blade tips.

02-07-2002 Over year old.

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