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Making an LRI probe

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rlalonde

Joined: 20 Nov 2006
Posts: 43

Posted: Tue Mar 20, 2007 3:10 pm Post subject: Making an LRI probe

Hi

Any suggestions on how to make the probe? Drilling 5 7/8 (quite deep)into 

the aluminum AND keeping it straight!!

Any suggestions??

Is this a job for a machine shop only?

Really anxious to try this thing out!!!!

Ron

 	  Quote: 	
		  


	


_________________________________________________________________

Have Some Fun Out Of The Sun This March Break 

http://local.live.com/?mkt=en-ca/?v &cid=A6D6BDB4586E357F!142

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secatur

Joined: 02 Nov 2006
Posts: 50
Location: New Zealand

Posted: Tue Mar 20, 2007 3:27 pm Post subject: Re: Making an LRI probe

Just wondering if it is possible to make the LRI probe out of Aluminiun Tubing ? (Like the Pitot tube only 2 tubes strapped together at proper distances etc.)



Anyone , any ideas ?



Steve

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secatur

Joined: 02 Nov 2006
Posts: 50
Location: New Zealand

Posted: Tue Mar 20, 2007 4:05 pm Post subject: Re: Making an LRI probe

Sorta like this ?

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p.mulwitz(at)worldnet.att
Guest

Posted: Tue Mar 20, 2007 4:26 pm Post subject: Making an LRI probe

Hi Steve,



I suppose it would be possible to redesign the LRI probe, but I don't 

know how you plan to make it work correctly.  I looked at my probe 

for a while and learned (I think) that the critical part of the probe 

is the ridge formed by the leading corner of metal.  It is this 

structure that divides the airflow into two parts for sampling at the 

two input holes.



The tube design would be OK for conducting the pressure to the gauge, 

but you still need a way to get the differential pressure sample from 

the airflow.



I don't think it is all that hard to drill the holes in the solid 

aluminum as shown in the LRI drawing.  I did it in an hour or two 

with a drill press and hand held drill.  I don't remember what kind 

of drill bits I used, but it might have included some of those 6" 

"Aircraft" drills.



Good luck,



Paul

XL fuselage

At 03:27 PM 3/20/2007, you wrote:

 	  Quote: 	
		  



Just wonderinf if it is possible to make the LRI probe out of 

Aluminiun Tubing ? (Like the Pitot tube only 2 tubes strapped 

together at proper distances etc.)



Anyone , any ideas ?



Steve





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=101976#101976




	


---------------------------------------------

Paul Mulwitz

32013 NE Dial Road

Camas, WA 98607

---------------------------------------------

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secatur

Joined: 02 Nov 2006
Posts: 50
Location: New Zealand

Posted: Tue Mar 20, 2007 5:00 pm Post subject: Re: Making an LRI probe

Hi Paul,

I don't think it is all that hard to drill your design either, and if you are correct about the differential pressure bit, you are probably right about a lot of stuffing around to get something that works correctly.



However, I'm sure it can be made to work, and as I have an "Enigma" EFIS that has the LRI/AOA Gauge built in I'm gonna experiment a bit with it. ('Cos I'm like that! LOL!)



Cheers,

Steve

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paulrod36(at)msn.com
Guest

Posted: Wed Mar 21, 2007 2:39 pm Post subject: Making an LRI probe

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Re the "sorta like this", illustration, I also made a lot of aluminum  shavings, trying to properly drill the *&^%$ probe.  I think, though,  that the magic comes from the differential pressure generated by the square nose  of the probe, with the inlets on upper and lower sides of the corner of the  block of aluminum. I put mine on the shelf for a while, but I plan to make a  probe equivalent to my longest drill's flutes, and then mount it with tubes held  rigidly. May not work, but worth a try.

  

 Paul Rodriguez

 601XL/Corvair

 [quote]   ---

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taffy0687(at)yahoo.com
Guest

Posted: Wed Mar 21, 2007 3:24 pm Post subject: Making an LRI probe

I am going to drill mine from each end, than weld one end closed. A 

  Fritz



paulrod36(at)msn.com wrote:

  [quote]      <?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->    Re the "sorta like this", illustration, I also made a lot of aluminum shavings, trying to properly drill the *&^%$ probe.  I think, though, that the magic comes from the differential pressure generated by the square nose of the probe, with the inlets on upper and lower sides of the corner of the block of aluminum. I put mine on the shelf for a while, but I plan to make a probe equivalent to my longest drill's flutes, and then mount it with tubes held rigidly. May not work, but worth a try.

   

  Paul Rodriguez

   601XL/Corvair

  [quote]  ---

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rjscep(at)yahoo.com
Guest

Posted: Wed Mar 21, 2007 8:50 pm Post subject: Making an LRI probe

 	  Quote: 	
		   Greetings. I drilled a solid piece of aluminum like

 the drawing said, however I did find that the 1/8 

 hole drilled out for the 3/16 hole was in the wrong 

 place. The dim. says drill it a half inch from the

 bottom and it doesn't come out in the right place, 

 so I made it 3/4 of an inch from the bottom. I used

 a #60 drill bit for a starter and drilled it 

 straight first and then changed the angle to get my

 45 degree hole. I also got brass fittings, they are

 a better fit on the bar. As far as making the face

 on the guage is concerned, I hand painted the 

 markings red, yellow and green. I used ordinary 

 hobby paints and I masked out the positions with

 contact paper, using an exacto knife I peeled away >

each part of the paper and painted that area, 
	


 	  Quote: 	
		   letting it dry and then proceeded with the other 

 places. If yoiu used the markings on the original

 plate it helps a lot to draw out the areas to be 

 painted and a French curve to get the proper arc too

 Do not archive

--- paulrod36(at)msn.com wrote:
	




[quote] Re the "sorta like this", illustration, I also made

 a lot of aluminum shavings, trying to properly drill

 the *&^%$ probe.  I think, though, that the magic

 comes from the differential pressure generated by

 the square nose of the probe, with the inlets on

 upper and lower sides of the corner of the block of

 aluminum. I put mine on the shelf for a while, but I

 plan to make a probe equivalent to my longest

 drill's flutes, and then mount it with tubes held

 rigidly. May not work, but worth a try.

 

 Paul Rodriguez

 601XL/Corvair

   ---

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cgbrt(at)mondenet.com
Guest

Posted: Fri Mar 23, 2007 8:27 pm Post subject: Making an LRI probe

Yes, Bend the lower one 30 degrees down; top as normal pitot.

Carl

701

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