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ray allen flap position sender indicator

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chris Sinfield

Joined: 28 Nov 2006
Posts: 270
Location: Sydney Australia

Posted: Fri Oct 15, 2010 12:31 am Post subject: ray allen flap position sender indicator

Gang 

which Ray Allen flap sender is used for the flaps on the XL?

RAC POS-5 or the POS  -12



which RAC indicator can i be used for ?

Chris..

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Fri Oct 15, 2010 2:23 am Post subject: Re: ray allen flap position sender indicator

Chris,



I cannot answer specifically which position sender will work best because I do not use one at all.  A quick glance out to the left gives me all the indication I need.  I have not missed being without a flap indication instrument.



Good luck,

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_________________
David Gallagher
Cincinnati, OH area

psm(at)att.net
Guest

Posted: Fri Oct 15, 2010 4:43 am Post subject: ray allen flap position sender indicator

Hi Chris,



I bought one of the Ray Allen sensors but I haven't installed it yet.



I think most of the sensors can be made to work.  You need some sort of

voltmeter with a modified face to reflect flap position instead of volts.

Then you need a variable resistor (such as the Ray Allen sensor) and you

need to figure a way to install it so flap motion makes it move.  This might

be some sort of bracket to put it in a good position and a way to attach it

to the flap control arm.



The electric circuit should have a dividing resistor (perhaps from Radio

Shack).  This allows the sensor to actually change the output voltage when

the arm moves.  Then you need a fuse or other current limit device to

prevent fire or damage if there is a short circuit.  When it is all

assembled you can calibrate the reading for the desired marks on the face of

the indicator.

I scribbled up a possible electrical circuit for this function and copied it

below.  It needs some more design work before you can install it in your

plane.



First you need to decide how much current to run through the sensor in the

maximum case.  This determines the size of the meter needed and the resistor

value.  A good place to start might be 50 milliamps.  Then obtain a meter

that is at least that large - perhaps a 50 mA sensor calls for a 100 mV

meter.  If you use this kind of current then a 1 amp fuse might work just

fine (you don't want the fuse too close to the actual current used - just

small enough to trip when a short circuit happens and huge current is called

for).



There are many sources for meters and resistors.  Wire should probably be

aircraft grade stuff, but with this kind of current the size is not

important.  I limit wire to 22 AWG as the smallest choice for mechanical

reasons.



Ohms law: I = E/R can be used to solve for all the current voltage and

resistance values needed.  I is current in amps, E is voltage in volts, R is

resistance in ohms.



If you get stuck on any of the steps please feel free to contact me offline.



(Sorry for the tutorial post.  I used to design stuff like this, and a lot

more complicated stuff, for a living many years ago).



Paul

Camas, WA



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rgeese

Joined: 16 Aug 2006
Posts: 19

Posted: Sat Oct 16, 2010 4:21 am Post subject: Re: ray allen flap position sender indicator

Chris--



I don't know what Paul is talking about, but it is very simple to do what you want to do. I used the RAC POS-12 sensor on the flap mechanism and a Ray Allen LED indicator on the panel and it works great. You can see how I did it at this site:



http://cid-2c08001814b26710.photos.live.com/browse.aspx/Ron%5E4s%20601XL



Check out photos 188 and 228. Keep in mind that I have the "original" type of flap motor mechanism. The sensor is actually measuring the up-down movement of the arm, but of course translates into the flap position.



Let me know if you want some closeup photos of the sensor connection.



email me at:  rgeese1-at-columbus.rr.com



Ron

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