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August 10th, 2008

HPV Cooling – NACA Duct Rational and Construction by Warren Beauchamp

SteveintheUK in Cooling, Design Aids, Products, Tech Info

A major issue with well sealed, fully faired HPVs is overheating. Racing during a typical 85 degree and 90 percent humidity Midwestern afternoon can generate in-fairing temperatures in excess of 110 degrees fairly rapidly. At that point it’s only a matter of a short period of time before a competitor experiences overheating and has to stop racing. This is not a good thing. In the past, streamliner builders have employed a few techniques to allow them to make it through a race without expiring:

  • Train for the heat – It has been found that if you train in high heat conditions, your body becomes acclimatized.
  • Ice in the water bottle/bladder – drinking cold water helps a lot
  • Spray bottle – some racers mount a spray bottle inside their fairing and spritz themselves during the race.
  • Air ducts – some racers put holes in the fairing or canopy to allow some air to cool the fairing.
  • Matt Weaver’s Virtual Edge used a human powered fan, which sucks air in from rear area of fairing and shoots in out the back .
  • Fancy cooling jackets – Umm… Right….

See the original article at wisil.recumbents.com to read the full text

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One Response to “HPV Cooling – NACA Duct Rational and Construction by Warren Beauchamp”

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Hello! Found this entry through a search. Pardon my ignorance, but I was wondering what HPVs really are.

–I couldn’t figure out if it’s a racing car or a boat of sorts.

Skip said on October 22nd, 2008 at 12:58 pm
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