Your Contributions do Make a Difference! - 2003/07

136 MODEL AVIATION
combination of data entered is unsafe by
displaying the Factor of Safety in red.
For our example, the program tells us
that the wire should exit the wing .702 inch
or 45⁄64 inches behind the CG. If we change
the inboard length to 15 inches, the program
tells us that we can go 163.5 mph with the
same horsepower. Playing with the program
a little reveals that the line is the greatest
drag producer. That is why F2A models had
such long inboard wings in the past, just to
cover the wire. It got so out of hand that
they were regulated to roughly 30 inches.
At many contests in the past it was
common to see several models come in on
takeoff and chase the pilots around. This
was caused by forward placement of the
line. A model built with the setback
calculated by Bob’s program rolls on the
dolly with a slight nose-out attitude, thus
removing the high-anxiety element from the
launch.
This works great for the events that are
timed on the fly, but some feel that the
model’s slight outward stance works against
the .21 Proto and Formula .40 models.
Those events are timed from release for 14
laps. Many feel that a quick first lap is of
utmost importance in those events. They say
that slight outward stance slows the model
for that most important first lap.
With Speed flying, there are no perfect
solutions for all events. This is the perfect
place for a device that could be mounted in
the wing that would allow the lines to be set
at zero setback, therefore allowing the model
to take off with zero yaw during that most
important first lap. Then when our model is
up to speed, our device would be triggered
by line pull to allow the lines to move back
to the perfect setback as calculated by Bob’s
program.
Please keep in mind that Bob’s program
is shareware; if you use it, you should send a
donation to Bob as listed in the program
help file. As with all things, please note that
your mileage may vary with the use of this
information.
The program is available on the Internet
or from the North American Speed Society
(NASS) for $5 to cover the cost of mailing
and reproduction.
Modelers who are interested in plans for
models from the past should take a look at
CD-ROMs made by Tom Wilk of Duluth,
Minnesota. He offers a CD that contains
more than 200 vintage Speed models
designed from 1940 to 1958. Another CD
features more than 125 models covering
classic Speed from 1959 to the present,
and there is one with Goodyear and Team
Racing designs.
The CDs are $10 each postpaid in the
US only. Contact Steve Wilk of
Eliminator Props at (763) 531-0604 to
order.
Anyone who is interested in more
information about CL Speed should
consider joining the North American
Speed Society. Write to NASS at Box 371,
Fenton MI 48430.
That’s it for now. I’ll be back in three
months. Please send me any pictures or
requests for items you would like to see in
the column. If you’d like a reply, an SASE
would be appreciated. MA
This month we list those who
have donated $10 or more in
support of the Academy’s programs,
the National Model Aviation
Museum and the Aeromodeling
Center. These people have made
more than a donation—they have
made an investment in the future of
aeromodeling.
When you see these folks, thank
them! They are now among the
thousands who have given back to
model aviation part of what model
aviation has given to them. Many
things will be possible due to the
their thoughtful giving and
generosity.
We list our supporters monthly.
These donations represent amounts
processed in the month of March
2003. If your name is not listed,
please write to the Membership
Department and include a canceled
check. We want to recognize all
contributors!
Thank you.
$100 up to $500
Horrace D Cain - TX
Harry E Grogan - FL
Donald C Krafft - MA
W H Langenberg - CA
Thomas B Pierce - MI
Sugar Creek Radio Control - IN
W K Werner - IL
Thomas C Adamson Jr - MI
Joseph M Araldi - FL
James A Bliss - TX
Clarence W Boyd - CA
Francis G Crosby Sr - SC
Ron A Devido - PA
Kevin L Feign - WI
Jeffrey E Gagne - AZ
James B Grant - CT
Steve R Groben - IN
Daniel E Kestenbaum - FL
Michael G Lower - WA
Daniel R Luchaco - PA
Marion County Cloud
Climbers - FL
C M Montplaisir - SC
Bolivar Muentes - FL
Katsuo Nakabayashi
Unkwang Phi
Bala H Pillai - NY
Earl J Sidmore - IL
MaRC A Stroobants - WI
Alexcey Techuk - TX
Jose A Torres - CT
$10 up to $100
Your Contributions do Make a Difference!
$500 up to $1000
William C Grigsby - FL