|
04-01-2010, 02:27 PM | #1 |
Guest
Posts: n/a
|
how to find or calculate density altitude ...
Is there an instrument or way to calculate density altitude when at the track that doesn't require one of these $$$ weather stations? I like to keep accurate records of my runs including weather conditions and would like to add in DA but don't know how to find or calculate it. I really don't want to spend $500+ on a weather station or predictor although the ones I've seen at the track are very, very nice. It is a FI car so I'll have my laptop with me so if they have wireless there I may be able to pick that up if it helps.
Thanks. |
04-01-2010, 03:18 PM | #2 |
Senior Member
Join Date: Dec 2009
Location: Ohio
Posts: 472
Likes: 0
Liked 0 Times in 0 Posts
|
Re: how to find or calculate density altitude ...
If you happen to already have a Porta Tree, you can add a weather station for a couple of hundred bucks...
Or if you are like me, and just wanted a really good reason to buy one, other than just practicing your reaction times, getting one with a weather station sealed the deal. David The New Hemi Guy |
04-01-2010, 03:56 PM | #3 |
Senior Member
Join Date: Apr 2003
Posts: 728
Likes: 4
Liked 13 Times in 7 Posts
|
Re: how to find or calculate density altitude ...
Try this site http://www.dragtimes.com/drag-racing...tors-tools.php
__________________
N/A Last edited by mannymen; 04-01-2010 at 04:07 PM. |
04-01-2010, 04:07 PM | #4 |
Senior Member
Join Date: Apr 2009
Location: Omaha, NE
Posts: 675
Likes: 138
Liked 72 Times in 40 Posts
|
Re: how to find or calculate density altitude ...
Yes. You can google the calculations. I believe you'll also need to calculate pressure altitude.
Or -- pickup a Kestrel 4250 for $259 if all you want is DA. http://cgi.ebay.com/Kestrel-4250--Ra...22161002r14155 |
04-01-2010, 04:18 PM | #5 |
VIP Member
Join Date: Feb 2003
Location: Glendale, Arizona
Posts: 2,988
Likes: 689
Liked 1,452 Times in 540 Posts
|
Re: how to find or calculate density altitude ...
If you a an iPod phone, there is an application for it:
http://itunes.apple.com/us/app/densi...313097113?mt=8 or DA= 145442.16 X [ 1- (17.326 x Pa) / Tr ] 0.235 where: * DA* = density altitude, feet * Pa = actual pressure (station pressure), inches Hg * Tr = temperature, deg R (deg F + 459.67) |
04-01-2010, 04:29 PM | #6 |
VIP Member
Join Date: Jun 2002
Location: New Holland, PA Mooresville,NC
Posts: 1,163
Likes: 212
Liked 16 Times in 11 Posts
|
Re: how to find or calculate density altitude ...
Go to a aircraft surplus and get an Altimeter with a barometer window, less than $100 and dam close. Seen them in tool boxes everywhere, some folks dont know what they are looking at.
__________________
Bob Pagano A/SA |
04-01-2010, 06:37 PM | #7 | |
Member
Join Date: Jan 2005
Location: North Massapequa, NY
Posts: 218
Likes: 0
Liked 0 Times in 0 Posts
|
Re: how to find or calculate density altitude ...
Quote:
http://www.campmor.com/outdoor/gear/Product___89661 Last edited by L79racer; 04-01-2010 at 06:41 PM. |
|
04-01-2010, 06:39 PM | #8 |
Member
Join Date: Jan 2005
Location: North Massapequa, NY
Posts: 218
Likes: 0
Liked 0 Times in 0 Posts
|
Re: how to find or calculate density altitude ...
another one.
http://www.campmor.com/outdoor/gear/Product___85329 Last edited by L79racer; 04-01-2010 at 06:42 PM. |
04-01-2010, 07:17 PM | #9 |
VIP Member
Join Date: Mar 2010
Location: Newport News, VA
Posts: 1,441
Likes: 373
Liked 129 Times in 59 Posts
|
Re: how to find or calculate density altitude ...
Another tool is the Hot Rod Calc which was designed by Calculated Industries and advertised on the NHRA.com homepage. It's a hand-held calculator which has pre-programmed automotive formulas that were designed for drag racers. I've found it useful to calculate basic ET predictions and horsepower estimates. It's now available from Mr. Gasket as Model 8703 for $79.95.
__________________
Lew Silverman #2070 "The Wagon Master" N/SA |
04-02-2010, 05:37 AM | #10 | |
Guest
Posts: n/a
|
Re: how to find or calculate density altitude ...
Quote:
That $259 deal also looks good down the road. Thanks for the great information guys. Really appreciate it. |
|
Thread Tools | |
Display Modes | |
|
|