Software Newsletter #16 - July 11, 2001
1. The Truth About Humidity and ET Prediction
2. Lebanon Valley - A Refreshing Experience
3. New! High Temp Gun-Style Infrared Thermometer
4. FREE Software Download
5. REAL World Technical Support
6. Most Accurate Digital Altimeter
-- The Truth About Humidity and ET Prediction --
Frequently, I get asked about the effects of humidity on ET Prediction.
Many racers try to develop their own 'formulas' for predicting ET using
a spreadsheet program. It just can't be done. The scientific formulas
that we use are much too complex for that. Humidity is one of the hardest
of variables to work with because it's effect on ET changes dramatically
with temperature. Some racers will say that humidity is the ONLY variable
that effects their car. Or, humidity effects my car differently. This
is not true! However, if you are not measuring the temperature, barometric
pressure, and humidity accurately, or using a program that doesn't calculate
the effects of humidity properly, your results may lead you to believe
The secret to ET Prediction is calculating how much oxygen is in the
air presently, RELATIVE to a previous time. And then finding the loss
or gain of horsepower due to the specific change in available oxygen.
Engine performance then, is only effected DIRECTLY by the amount of
oxygen molecules in a given cubic foot of air. Nothing else.
The variables, Temperature, Barometric Pressure, and Humidity are responsible
for the change in available oxygen. Barometric Pressure compresses the
air and allows more room for oxygen molecules. So, the higher the Barometric
Pressure, the more horsepower your engine will produce. Higher temperatures
expand the air molecules, and therefore decrease the room for oxygen.
So, the higher the Temperature, the less horsepower your engine will
produce. Humidity is just water vapor. The presence of water vapor takes
up room and therefore, displaces oxygen molecules. So, the higher the
Humidity, the less horsepower your engine will produce.
Temperature is the biggest factor in predicting performance, not humidity.
However, the higher the temperature, the bigger effect humidity has
on performance. If you are not measuring the temperature accurately,
then the effect of humidity can not be calculated accurately. And, at
higher temperatures this becomes very dramatic. For example, at 70 degrees,
the addition of 82 per cent humidity could slow your ET by .073 seconds.
At 78 degrees, the same amount of humidity could slow your ET by .100
seconds. Almost three (3) more hundredths due to the humidity alone.
About .026 more due to the change in temperature alone. So, if you read
your temperature gauge wrong, or your gauge was inaccurate, under high
humidity conditions, your Predicted ET could easily be wrong by .060
of a second or more. Garbage in, garbage out.
-- Lebanon Valley
- A Refreshing Experience --
Boy, do I love Lebanon
Valley. They have this race planned at just the right time of year.
Just when, you are fed up and ready to quit racing, you go to Lebanon
Valley, the pause that refreshes! I wish every race track could follow
We arrived late Thursday afternoon and because there was a test and
tune, most of the parking was already filled up. As usual, many spots
were saved, but I noticed a few empty ones. When we were told to go
out to 'the pasture', I mentioned that I saw a few spots close to the
staging lanes that I could easily fit into. Immediately, I was given
one of these better spots. Cool!
After getting parked, we walked up to the head of the staging lanes
and noticed that the track was being scraped and prepared for Friday's
time session. The track was in excellent condition, for the very first
time run. Our DataMaster data recorder showed that traction was better
here than at any track I have been to this year. And, the track was
kept in good condition over the entire event.
Friday night we were treated to Alcohol qualifying, Jet Cars, Top 8
races, and a wonderful fireworks display. Saturday night we were treated
to a free barbecue hosted annually by Chuck Rothermel and friends. The
Auto Start system worked perfectly, with the delay for Super Comp being
set at the proper two second interval for each round of competition.
Super Comp was third out each morning and the schedule was followed
almost to perfection, even with some bad weather conditions. No one
was skipped over. Imagine, we were actually racing in the morning again!
We had lights of .410, .414, .403, .400, and .416 before going red.
I always go red at Lebanon Valley, at some point, so it was expected.
No big deal. First round we went .400 with an 8.8993, just 7 ten thousandths
from a perfect run. I have a perfect run with my old car, but it was
done during time runs, so I guess it doesn't count. So, this was a memorable
race for me..
Now, don't get the impression that this is unusual treatment. I went
to Lebanon Valley for the first time in 1995. I remember arriving at
about 5:30 AM. Instead of having to wait, we were parked that early
in the morning! Then, a truck pulled up behind us. It was the owner
of the race track and he gave us coffee and donuts! He also gave me
a can of nonalcoholic beer and said that if we win the race, to use
it to celebrate. We did win the race! And, I still have that unopened
can of beer. Every year since then, it has gotten nothing but better.
It is always worth the trip.
-- New High Temp 'Gun-Style' Digital Infrared Thermometer --
We now offer another Digital Infrared Thermometer with Laser Sighting,
Part # IRT4. The new Gun Style unit has a temperature range of 0 to
788 degrees F, has a backlight, an 8:1 Optical Resolution, and an Auto-Off
feature. The introductory price is just $99.95! That is about what you
would pay for a unit WITHOUT laser sighting and with a lower temperature
range. Comparable prices for a unit with these specifications is about
fifty or sixty dollars more.
-- FREE Software Download -- The DOS version of our DataMaster
Analyzer software, Version 2.0, is available to you as a FREE download
on our web site. (The Windows version is too big to download because
of all the associated Windows Dll's and other MicroSoft files that have
to be installed.) You don't need a data recorder to test the software
and see exactly what a DataMaster Sportsman Computer does better than
any other data logger system in the world! Yes, better than the most
expensive data logger in the world. Only, ours is not expensive. If
you have any older version of this software, download this as a FREE
-- REAL World Technical Support --
With Family Software, you'll get better technical support than anywhere
on the planet. Why? Because, we design and/or use all of the products
that we sell. All of my 30+ years of racing experience and knowledge
is available to you and our other customers. Try to find that kind of
information at any one of our competitors. You won't be able to, I guarantee
it! Family Software cares about the racer and his/her success as a racer.
The other companies just want your money!
-- Most Accurate Digital Altimeter --
We have in stock, the best digital electronic altimeter that we have
ever seen. It has a resolution of just one (1) foot. This unit is just
$149.95. You just can't beat that! Using this gauge and one of our CMM880
Digital Temperature/Humidity gauges, you'll get better air readings
than ANY other weather station/trailer station on the market, guaranteed.
To read the specs on this unit, just go to the Products page on our
web site and click on Digital Altimeter.
-- Toll Free Ordering --
We also have a new Toll Free Order line to save you even more money!
If you're placing an order by phone, call 877-497-0992. If you need
information or technical help, call 610-497-5561.
-- Secure Ordering --
You can safely order directly from our web site. All of your information
and it is posted on the web site. Our company is registered with the
Public Eye for safe, secure ordering.
have questions or topics that you would like to see covered in this
newsletter, please Email them to me. Or,
start a new topic on the bulletin board located on our web site. I'll
be glad to join in.
Family Software - Drag Racing Computers and Software
http://www.iFamilySoftware.com - 610.497.5561(Voice/Fax)
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