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Ray Allen Position Sensor for Flaps

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Mark Colbeck

Joined: 04 Nov 2007
Posts: 29
Location: Cochrane, Alberta, Canada

Posted: Sun Mar 23, 2008 8:59 am Post subject: Ray Allen Position Sensor for Flaps

Does anyone have or have you seen a working set up for using a Ray Allen position sensor for flap position. My issue is 1.2" travel on sensor 2" travel on actuator. This is assuming the sensor is going next to the actuator. I though I could save some time in trial and error an see if anyone has an answer (you guys usually do)

Thanks

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craig(at)craigandjean.com
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Posted: Sun Mar 23, 2008 9:46 am Post subject: Ray Allen Position Sensor for Flaps

My experience is with the 601XL and I am not sure how things are set up on the 701. On the XL I have seen two styles of solution. In the first an arm is attached to the shaft that rotates to actuate the flaps. One end of the position sensor is tied to the fuselage while the other fastens to some point on the arm. Since the arm moves less than 1.2 inches at the tube (relative to the attachment point on the fuselage) and more than 1.2 inches at a point further out the arm you just find the point on the arm that moves just a bit under 1.2 inches. The pictures below are from Mike Sigman’s 601XL.  

   

Ron Geese has a clever solution that doesn’t involve adding a arm. The flap linear actuator is tied to a fixed pivot at one end and an arm on the rotating flap tube on the other. So, again, somewhere along the actuator is a point where the mechanism rises about 1.2 inches across the whole range of motion. Just connect the sensor at that point. I attached two photos that Ron sent me.  

   

-- Craig  

   

Mike’s solution (three photos):  

   

[img]cid:image001.jpg(at)01C88CD9.BCBD17C0[/img]  

[img]cid:image002.jpg(at)01C88CD9.BCBD17C0[/img]  

[img]cid:image003.jpg(at)01C88CD9.BCBD17C0[/img]  

   

--

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Jaybannist(at)cs.com
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Posted: Sun Mar 23, 2008 10:12 am Post subject: Ray Allen Position Sensor for Flaps

Mark,

 

 I, too, have a 601XL.  I didn't use a Ray Allen flap position sensor.  I use LOWF (pronounced "lowf").  Look Out Window at Flaps.  

 

 Jay in Dallas     [quote][b]

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Terry Phillips

Joined: 11 Jan 2006
Posts: 346
Location: Corvallis, MT

Posted: Sun Mar 23, 2008 2:39 pm Post subject: Ray Allen Position Sensor for Flaps

I have considered a flap indicator problem for my 601. The solutions 

already mentioned would accommodate the R.A. Allen indicator. I'd like to 

suggest a cheaper, simpler indicator.



Yesterday I visited Clayton, my EAA Tech Counselor at his hangar in Helena. 

He showed me the homemade flap indicator on his RV-6. The RV-6 flap 

appeared to rotate on an axle or hinges located at the center of the flap. 

He just painted suitable lines on the skin of his flap around the rotation 

axle so that the exposed line indicated the angle. Then glancing over his 

left shoulder, he could read the deflection angle directly by seeing which 

lines were exposed. 'Sorry, I didn't get any pictures. Obviously, this only 

works in daylight.



That concept won't work with the 601 because the flap is hinged at the 

bottom, instead of rotating on a central pivot. So, I've been thinking 

about suitable visual indicators for the 601.



So far what I've come up with is shown, sort of, in the attached sketch. 

The idea is to rivet a short piece of L-angle to the forward skin of the 

flange, maybe 3/4" below the top, with the web vertical. Then put a #8 

screw through the web of the angle to produce a pivot for a piece of ~10 or 

12 AWG aluminum wire that would extend into the wing through an ~1/8" hole 

in the rear spar. Paint the wire black and then paint on white rings for 

10, 20, and 30° (or whatever) flap positions. A quick glance would confirm 

the flap position. I'd place it just outside rear rib #4, so it wouldn't 

get stepped on during entry.



Has anyone implemented a similar indicator? If so, how has it worked? Comments?



Terry

At 09:59 AM 3/23/2008 -0700, you wrote:

 	  Quote: 	
		  Does anyone have or have you seen a working set up for using a Ray Allen 

position sensor for flap position. My issue is 1.2" travel on sensor 2" 

travel on actuator. This is assuming the sensor is going next to the 

actuator. I though I could save some time in trial and error an see if 

anyone has an answer (you guys usually do)

Thanks


	




Terry Phillips

ttp44~at~rkymtn.net

Corvallis MT

601XL/Jab 3300 s .. l .. o .. o .. w build kit - Tail, flaps, & ailerons 

are done; working on the wings

http://www.mykitlog.com/N47TP/

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Terry Phillips
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ttp44<at>rkymtn.net
Zenith 601XL/Jab 3300 slow build kit - Tail feathers done; working on the wings.

ashontz

Joined: 27 Dec 2006
Posts: 723

Posted: Sun Mar 23, 2008 5:12 pm Post subject: Re: Ray Allen Position Sensor for Flaps

Go down to Boater's World and pickup an trim sender for about $35.



 	  Mark Colbeck wrote: 	
		  Does anyone have or have you seen a working set up for using a Ray Allen position sensor for flap position. My issue is 1.2" travel on sensor 2" travel on actuator. This is assuming the sensor is going next to the actuator. I though I could save some time in trial and error an see if anyone has an answer (you guys usually do)

Thanks

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Mark Colbeck

Joined: 04 Nov 2007
Posts: 29
Location: Cochrane, Alberta, Canada

Posted: Mon Mar 24, 2008 4:25 am Post subject: Re: Ray Allen Position Sensor for Flaps

Thanks for the input. I think I got it figured now.

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