Air Density Online

Info and Education

Historical Weather Data

By Jennifer on September 20th, 2016 in Info and Education, Main News

We've gotten a few questions recently asking about weather data from a past date. We do not store historical data on our site. But all hope is not lost! There is still a way to get air density or adjusted altitude from a previous date.

  1. Type in the date and location at Weather Underground History & Data Archive.
  2. Once you've found your date and location, scroll to the bottom to find the closest time in the Hourly Weather History & Observations section.
  3. You will need to get the elevation for your location. You can find that either on the track page or using the altitude calculator near the bottom of the free calcs page.
  4. Then using the temperature, humidity, and barometer from Weather Underground as well as the elevation, use the top calculator on the free calcs page to get the air density, density altitude, corrected barometer, and other information.

Hopefully this will help when looking for weather from past dates!

Measuring the Atmosphere Around a Track

By Jennifer on August 22nd, 2016 in Info and Education, Main News

Imagine a cubic foot of air near the ground level at the race track. It may seem empty but there are molecules moving around within that area. Depending on various environmental factors, that cubic foot of air can contain oxygen, other elements such as nitrogen and carbon dioxide, moisture, and particles of pollution. Each of these vary depending on the location, elevation, and current weather environment.

We need oxygen for combustion in our engines. However, as we can see, the amount of oxygen in the atmosphere fluctuates. This is why, for instance, you might notice a great engine performance at certain times of day and bad performance at others. Tracking the weather can help us determine jetting changes in order to compensate for the changing atmosphere. Using the information we provide on the tracks pages of this site can help you do that.

This article will explain those variables. Hopefully it will help you to better understand the atmosphere and better tune your engine for optimum performance.

Read the rest of this article »

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