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Elevator set up

O

Ohio AV8TOR

So guys please help me out here. I have read about problems with cam over on the Extreme Flight 78" Extra which is not a EXP plane when people try and overdrive their surfaces. So I am setting up my 83" EF MXS and the manual just says to get as much control as you can on the elevator high rate. So these two pictures are at each extreme at 100% endpoint and up elevator is at 55º and down is at 50º (just initial hook up at this point. At neutral the control arm is exactly st 90º to the case. Is the down elevator position at risk of cam over? If I try and force the surface down it does not seem at all like it will flip.



So a few things to point out. The manual shows the servo flipped with the output shaft facing aft requiring a shorter rod. People have reported that this looks worse for cam over so the suggestion is face it forward using a longer rod increasing the angle at least in the up elevator position. I also went to the 2" position thinking the angle is better.



Are these of concern and can I increase the travel if necessary down the road? Thanks for your help





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15282=8749-ele.JPG]
15282=8749-ele.JPG
15282=8750-photo.JPG]
15282=8750-photo.JPG
 
15326=9126-uploadfromtaptalk1409966062051.jpg
15326=9126-uploadfromtaptalk1409966062051.jpg
Here's my EF78 Extra with 47* down. I've been flying this setup for 3 years without a problem. If this is a potential cam-over fail, then I've got something new to worry about that I didn't even know existed. What I see (when I'm watching ) is that it always moves smoothly back to neutral.
 
Ohio AV8TOR;15282 wrote: So guys please help me out here. I have read about problems with cam over on the Extreme Flight 78" Extra which is not a EXP plane when people try and overdrive their surfaces. So I am setting up my 83" EF MXS and the manual just says to get as much control as you can on the elevator high rate. So these two pictures are at each extreme at 100% endpoint and up elevator is at 55º and down is at 50º (just initial hook up at this point. At neutral the control arm is exactly st 90º to the case. Is the down elevator position at risk of cam over? If I try and force the surface down it does not seem at all like it will flip.



So a few things to point out. The manual shows the servo flipped with the output shaft facing aft requiring a shorter rod. People have reported that this looks worse for cam over so the suggestion is face it forward using a longer rod increasing the angle at least in the up elevator position. I also went to the 2" position thinking the angle is better.



Are these of concern and can I increase the travel if necessary down the road? Thanks for your help





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I'd go with it. If the surface meets the bevel before the servo reaches the cam over point, you'll be ok. Looks like the control horn will meet the stab before the bevels meet??
 

bob_nj

70cc twin V2
"At neutral the control arm is exactly st 90º to the case"

In some cases where the servo box is installed this will be the situation.

General rule of thumb is that the servo arm should be parallel to the hinge line.

Can someone tell me how to insert a "quote" for other than an entire post?

 

Thanks Bob
 
O

Ohio AV8TOR

bob_nj said

Can someone tell me how to insert a "quote" for other than an entire post?


Thanks Bob
Just like any other forum - click on quote which will select "all" text to be quoted but then you insert the curser and delete what text you don't want just like I did to yours.  
 
O

Ohio AV8TOR

So I thought I would add this image that I did over my setup from talking with some people about this as I understand it better now.  You need to form and maintain two triangles and it won't cam over.  Triangle ABD (D is the hinge pivot line) was my concern but it is not a problem unless B gets pulled into line AD where it could be pushed up and over jamming it.  Same for ABC.  This is very safe but you do not want A to cross into line BC when it pushes the other way. 

 

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