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Consequently, a key consideration for flying an altimeter in your rocket is providing for a way for the air pressure outside the model to be accurately "seen" by your altimeter with little time lag. Based on the experience from my NAR R&D project and several hundred other model rocket flights carrying one or more altimeters, I can say that for the most part, it's not hard to get "good enough" venting for your altimeter. For most any model-rocket-sized volume flying at a realistic model rocket speed, it doesn't take a large amount of vent area and altimeters are really pretty forgiving about this. His interest in testing and comparing with data immediately led him to start flying altimeters in his rockets, beginning by flying devices made for model airplanes as rocket altimeters. [Extracted from the article]