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HelicopterHIROBOOther › Setting up Push-Pull on EVO 50
01-25-2007 08:11 PM  10 years agoPost 1
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Hi guys, I'm setting up the push-pull on my EVO 50.

In the drawing on p36 of the manual they show the offsets or distance for the balls on the elevator servo disk as 9.5mm. That has got to be wrong! (Just looking at the picture, they are showing a large servo disk which is the same diameter as the "X-type lever" - and the balls are towards the outside of the disk.)

The distance of the balls from center at the "X-type lever" is closer to 17mm. Surely it would be best to set the balls as close to 17mm on the servo disk to get a parallelogram?

At 9.5mm, the rods will not even be close to parallel. At first I initially thought it would cause binding too, but after thinking about it I guess it won't. But it will reduce the throw considerably.

Did you guys set yours at 9.5, or did you try to make the rods more parallel and set them closer to 17mm???

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01-25-2007 08:19 PM  10 years agoPost 2
z11355

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New England

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I dont have the manual but I believe the correct reading is 9.5mm
on EACH side of servo center, yielding 19mm total

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01-25-2007 08:41 PM  10 years agoPost 3
ket

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ohio hill country

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z11355 is correct the measurement shown in manual is from center of screw to center of hole you drill on servo wheel,, combine the two to get total

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01-25-2007 09:31 PM  10 years agoPost 4
Rockohaulic

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Yes it is each side. And the balls on the "X-Type lever" are 17mm on each side of the servo center!

9.5mm (radius) is very small... i.e the small disk that the servos come with. Not the big disk that they want you to use for the cyclic.

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01-25-2007 11:07 PM  10 years agoPost 5
dgshaffer

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New Jersey

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Don't forget to offset the balls 2* towards the nose of the heli if you want it to fly as precise as it can!

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01-26-2007 12:30 AM  10 years agoPost 6
Rockohaulic

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dgshaffer,

Can you elaborate on that some more - I have no idea what you are talking about.

Are you saying to offset them 2 deg towards the nose? What does that exactly mean??

And how does that affect the way it flies?

Thanks for your advice!

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01-26-2007 01:10 AM  10 years agoPost 7
Tony-V

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Fraser Mi

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What dgshaffer is saying is if you look at the bottom of page 36 it shows the balls on the servo wheel are not 90 degrees to the line from the center of the wheel to the X-type lever, they are ahead of it by 2 degrees the best way I have found to achive this is by using a clear plastic triangle and hold it so one edge is going thru the center of the x-type lever and the center of the wheel and the 90 degree corner is in the center of the wheel then turn the wheel untill one of the lines is inline with the edge of the triangle. then you can use a futaba horn drill gage to get the correct distance from center and the 2 degree offset required.

I hope this is understandable if not you can pm me your number and I can call and walk you thru it.

Tony

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01-26-2007 03:43 AM  10 years agoPost 8
dgshaffer

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New Jersey

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Maybe these photos will help you to see whats going on.

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01-26-2007 03:21 PM  10 years agoPost 9
Tony-V

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Fraser Mi

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Ive taken dgshaffer's pic and added a few lines to show what I was talking about.

hope you don't mind dgshaffer

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01-26-2007 05:25 PM  10 years agoPost 10
chopperman1

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Huntsville, AL

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SO its only on one side of the push pull system that you want to set back 2* not both links?

Cliff

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01-26-2007 05:28 PM  10 years agoPost 11
dgshaffer

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New Jersey

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hope you don't mind dgshaffer
Great illustration. Glad to see I've got backup.

If you look at the two photos closely that should answer your question.

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01-26-2007 05:30 PM  10 years agoPost 12
Tony-V

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Fraser Mi

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No, both sides will have the 2 degree offset, I just outlined it on one of the pics, if you look at the pics posted by dgshaffer you can see it is on both sides.

(Both links on both sides will be offset 2 degrees)

Note also that the distance from the center of the servo wheel to the balls is different from side to side.

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01-26-2007 05:44 PM  10 years agoPost 13
Tony-V

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Fraser Mi

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Once again, the Futaba horn drill gauge makes this easy. they are well worth the money. they come in two sizes and you need both to do the Evo's servo wheels

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01-26-2007 05:51 PM  10 years agoPost 14
dgshaffer

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New Jersey

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That's what I use. Makes drilling the wheels a 30 second job.

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01-26-2007 05:51 PM  10 years agoPost 15
abgraham

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Deep South Texas

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Here's a thread that discusses the 2 degree offset:

http://runryder.com/helicopter/t298430p1/

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01-27-2007 12:29 AM  10 years agoPost 16
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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How does the Futaba Horn Drill Gauge help with the 2 degree issue?

Do you guys know how little 2 degrees is? At 9.5mm away from center, there isn't much difference at all!

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01-27-2007 12:46 AM  10 years agoPost 17
dgshaffer

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New Jersey

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It has degree markings on it.

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01-27-2007 02:53 AM  10 years agoPost 18
Tony-V

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Fraser Mi

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I know it doesn't sound like much but it does make a differance.

I read somewhere were Jeff Green explained it but I don't remember whre.

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01-27-2007 04:53 AM  10 years agoPost 19
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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I didn't do the math, but I did draw it out on paper with a small protractor, and at 9.5mm the ball will be 1mm offset for 2 degrees (or about the width of the ball screw).

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01-27-2007 10:19 AM  10 years agoPost 20
dgshaffer

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New Jersey

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Their is a reason for it, if you study the geometry of the configuration you'll soon see why. I know a lot of guys that will tell you that theirs fly just fine without doing that. Good for them but I can see why it's done, I've watched Jeff do it as he explained why, I done it both ways and could see the binding coming into play.

I do it per the manual. Good for me

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HelicopterHIROBOOther › Setting up Push-Pull on EVO 50
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