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  #11  
Old 03-15-2020, 08:17 AM
BobRV7 BobRV7 is offline
 
Join Date: Mar 2006
Location: Loveland, Co
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Looks like he drilled a hole in that HF suction handle then has another suction cup over the static port maybe something like this:
https://www.amazon.com/Pawfly-Aquari...4281633&sr=8-4
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  #12  
Old 03-16-2020, 06:35 AM
WingsOnWheels WingsOnWheels is online now
 
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The most accurate digital or mechanical manometer you will find (other than a proper test-rig) is the altimeter in the plane. So anything less than a formal pitot-static test rig is a waste for anything other than a leak-check.
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  #13  
Old 03-16-2020, 10:20 AM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGG
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Default test rig

Quote:
Originally Posted by WingsOnWheels View Post
The most accurate digital or mechanical manometer you will find (other than a proper test-rig) is the altimeter in the plane. So anything less than a formal pitot-static test rig is a waste for anything other than a leak-check.
Seems like you are right - lots of things are changing all the time, so thought this might be an area for some innovation, but I guess not quite yet!
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  #14  
Old 03-17-2020, 07:59 AM
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Snowflake Snowflake is offline
 
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Location: Victoria, BC, Canada
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Quote:
Originally Posted by WingsOnWheels View Post
The most accurate digital or mechanical manometer you will find (other than a proper test-rig) is the altimeter in the plane. So anything less than a formal pitot-static test rig is a waste for anything other than a leak-check.
Well, a water manometer is at least as accurate, if not more so, but as someone pointed out you need something like a 20' U-tube to set one up to test to full altitude. So not really practical.
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  #15  
Old 03-17-2020, 12:12 PM
WingsOnWheels WingsOnWheels is online now
 
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Quote:
Originally Posted by Snowflake View Post
Well, a water manometer is at least as accurate, if not more so, but as someone pointed out you need something like a 20' U-tube to set one up to test to full altitude. So not really practical.
Good point, switch to mercury...haha
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  #16  
Old 03-17-2020, 01:27 PM
scsmith scsmith is offline
 
Join Date: Jan 2008
Location: Ashland, OR
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Quote:
Originally Posted by Carl Froehlich View Post
Here is a simple rig to check for static leaks. Harbor Freight parts and some assembly. I just used this on the new RV-8 project to verify the system tight - and sure enough found a fitting not well seated. A few minutes later it was fixed and saved me the pain of paying to get a failed pitot/static check.

Credit goes to Tom Doran (N716RV)

For pitot I use a $4 manometer to verify airspeed accuracy and pitot line tight. This setup is amazingly accurate. Use google to find the PDF file for the airspeed grid.

Carl
Carl, how does the black tube from the syringe connect to the static port? I don't imagine a simple suction cup will seal over the pop-rivet static port. It looks like the dual suction cup lift handle is just a support to hold the tube in place?
Does the dual suction cup lift clamp down enough to push the end of a rubber tube up tight against the static port?
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Last edited by scsmith : 03-17-2020 at 01:33 PM.
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  #17  
Old 03-17-2020, 05:33 PM
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Carl Froehlich Carl Froehlich is offline
 
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Location: Dogwood Airpark (VA42)
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The suction cup is a standard one you can find at most hobby stores, Walmart, etc. Drill a 1/4 hole through the center of the cup, slide in a piece of 1/4 tubing and add some RTV to make the seal. Drill a 1/4 hole through the suction cup holder for the tubing. Now add a spring between the suction cup and the holder to press the suction cup against the fuselage. Add a rubber hose to the tubing and then your suction source of choice.

Carl
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