At 01:19 AM 9/15/2006, you wrote: >For interest sake, does anybody know exactly how these things work. I know >it measures the rate of change in static pressure but then the needle should >return to zero or at least move in that direction if I keep a constant >pressure on the rear port with my finger.
It is a small pressure chamber with a calibrated hole and a needle that connects to a diaphragm on the chamber. The hole lets air in and out of the chamber slowly. When pressure is equal inside and outside, the needle should point to zero. The needle moves based on the rate of pressure change. Don Reid - donreid "at" peoplepc.com Bumpass, Va Visit my web sites at: AeroFoil, a 2-D Airfoil Design And Analysis Computer Program: http://aerofoilengineering.com KR2XL construction: http://aerofoilengineering.com/KR/KR2XL.htm EAA Chapter 231: http://eaa231.org Ultralights: http://usua250.org VA EAA Regional Fly-in: http://vaeaa.org
