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Leaking Static
I have a lak 12. It has 4 static ports on the fuselage. Left and right ports are mixed. If the tubes connecting the ports have leaks, who can I fix them as I do not know any 8" mechanics.
I think I have 3 options replace the tubes I can reach relocate the static ports Cut an access hole in the boom (expensive) Any other ideas Max |
#2
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Leaking Static
Hi Max,
There is a way to install statics, but its probably less work to cut a 4" hole on the bottom and re-plumb your originals. How bad is the leak? You can stand a slight leak, the TE line is the one where you don't want any leak to exist. I'd say a 30 knot drop in 60 seconds would be acceptable (100k down to 70K in 1 minute). You could also install a triple probe in the fin, but that's even more fun. Do another leak check as close to the statics as you can get to make sure the problem is in the boom, not up forward. Clean the area around the statics and use good plastic tape to seal them up for the test. Hope this helps, JJ |
#3
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Leaking Static
On Jan 31, 7:14*pm, Max Birley
wrote: I have a lak 12. It has 4 static ports on the fuselage. Left and right ports are mixed. If the tubes connecting the ports have leaks, who can I fix them as I do not know any 8" mechanics. I think I have 3 options replace the tubes I can reach relocate the static ports Cut *an access hole in the boom (expensive) Any other ideas Max -- Max Birley Max, Tools - A Syringe, a Tee fitting and an airspeed indicator (use the one in your panel no need to remove.it). Put a tee in the line one side to the syringe, one to your airspeed indicator one the line you are checking. Total Energy - Put the probe in the fitting and tape also tape the holes in the TE probe. . Pressure the lines to 60 knots. NO LEAKS AT ALL it should hold for ever. I know nothing is forever so lets say 1 or 2 minutes holding the A/S at 60 knots.. AirSpeed - plug the pitot line (ram air in) pressure to 60 knots. NO LEAKS AT ALL it should hold for many minutes. Statics you can check the same way but I would not worry if they have a small leaks, unless you are connecting the static to a vario. Usually there are statics in the rear fuselage (which you can’t get to) , center under the wings on the fuselage, ( which you can get to) and front (which you can get to) if you have leaks in the back one your could disconnect and not use them and connect your instruments to the wing or front statics. Someone mentioned flushing the lines with water to clean them out. I would not flush lines with water ever. It can damage your instruments if you don't get it all out and if you have water in the TE line it will block the air flow intermittently as the water bubble moves back and forth. Strange indications on your vario, it will go from zero the a high climb rate or sink when the bubble lets pressure or suction through. With the TE probe removed you should be able to easily blow through the lines. Give me a call if you need some coaching. Richard www.craggyaero.com |
#4
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Leaking Static
On Feb 1, 9:34*am, JJ Sinclair wrote:
Hi Max, There is a way to install statics, but its probably less work to cut a 4" hole on the bottom and re-plumb your originals. JJ has no problem with cutting holes because he's very good it fixing them afterwards Some people would rather spend a month designing and fabricating a special tool set than to cut a hole in their nice glider. Someone must have tackled this problem before and have some tool ideas. I suppose you could always try contacting an endoscopic surgical instrument supplier and ask for a demonstration. Andy |
#5
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Leaking Static
On Feb 2, 10:03*am, Andy wrote:
On Feb 1, 9:34*am, JJ Sinclair wrote: Hi Max, There is a way to install statics, but its probably less work to cut a 4" hole on the bottom and re-plumb your originals. JJ has no problem with cutting holes because he's very good it fixing them afterwards Some people would rather spend a month designing and fabricating a special tool set than to cut a hole in their nice glider. Someone must have tackled this problem before and have some tool ideas. I suppose you could always try contacting an endoscopic surgical instrument supplier and ask for a demonstration. Andy For what it's worth, I have a very slow leak in my rear static line. The TE, front static and pitot are all leak-free. I only use the rear static ports for the "static" connection on the 302. The altimeter is connected to the front static ports, and the 302 (TE connection) and mechanical vario get TE probe. I did worry about it when I discovered the leak, but after flying with it I'm glad I didn't go through the mess of cutting holes and such. Seems to be fine. I checked it again the following season and the rate of leak did not change. If it gets bad I'll do something about it. For now, it doesn't seem to be affecting anything. My varios all work great. |
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