RobertGary1 Posted March 21, 2015 Report Posted March 21, 2015 Curious what size hose people use to perform the pitot test Mooney specifies (basically roll the hose up to 150 mph indicated and hold). Looks to be about 3/4" but you may save me some trial and error if you know otherwise. -Robert Quote
Piloto Posted March 21, 2015 Report Posted March 21, 2015 Pitot measurement is static pressure on the pitot line, there is no air flow. The airspeed indicator is just an air pressure indicator. The size of the hose is irrelevant. José Quote
RobertGary1 Posted March 21, 2015 Author Report Posted March 21, 2015 Pitot measurement is static pressure on the pitot line, there is no air flow. The airspeed indicator is just an air pressure indicator. The size of the hose is irrelevant.José It's relivent if you want it to fit over the tube properly. -Robert 1 Quote
Raygun15E Posted March 21, 2015 Report Posted March 21, 2015 I have a hose I bought from True Value. I believe it is 5/8s but will have to check it tomorrow. Quote
Guest Posted March 21, 2015 Report Posted March 21, 2015 Curious what size hose people use to perform the pitot test Mooney specifies (basically roll the hose up to 150 mph indicated and hold). Looks to be about 3/4" but you may save me some trial and error if you know otherwise. -Robert I use a piece of 3/8" surgical tubing. I pull it over the front of the pitot tube being sure to cover the small drain hole on the bottom. If you can't get over the hole cover it with some 3/4" electrical tape. Next I use a cheap surgical haemostat to pinch the end closed. Start rolling the tubing around the haemostat to raise the airspeed to check the anti retraction system. Clarence Quote
ALP Posted March 21, 2015 Report Posted March 21, 2015 I made one of these. Never thought of rolling a hose up for pressure. http://www.iflyez.com/manometer.shtml 1 Quote
HRM Posted March 21, 2015 Report Posted March 21, 2015 I made one of these. Never thought of rolling a hose up for pressure. http://www.iflyez.com/manometer.shtml  That tests much more than just the anti-retract. Great (and cheap) tool to have in the hangar. Quote
RobertGary1 Posted March 21, 2015 Author Report Posted March 21, 2015 I made one of these. Never thought of rolling a hose up for pressure. http://www.iflyez.com/manometer.shtml That's pretty intense. I'm not creative enough to come up with the tube rolling test, it's chapter and verse from the Mooney manual. -Robert Quote
jetdriven Posted March 21, 2015 Report Posted March 21, 2015 You guys have it too hard. The 1977s have a squat switch and don't use that fancy airspeed switch. The downside is the gear sometimes doesn't retract in cold weather. Quote
RobertGary1 Posted March 21, 2015 Author Report Posted March 21, 2015 I have a squat switch as well. I'm checking for leaks after replacing the drain seals in the pitot line. -Robert 1 Quote
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