About Airplanes & Rockets

Kirt Blattenberger, Webmaster - Airplanes and Rockets
Kirt Blattenberger
Carpe Diem!
(Seize the Day!)

Even during the busiest times of my life I have endeavored to maintain some form of model building activity. This site has been created to help me chronicle my journey through a lifelong involvement in model aviation, which all began in Mayo, MD. There is a lot of good information and there are lot of pictures throughout the website that you will probably find useful, and might even bring back some old memories from your own days of yore. The website began life around 1996 as an EarthLink screen name of ModelAirplanes, and quickly grew to where more server space ...

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Copyright 1996 - 2016
Webmaster:
Kirt Blattenberger
BSEE - KB3UON
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text used on the Airplanes and Rockets website are hereby acknowledged.

Modeling Resources

Academy of Model Aeronautics (AMA) - Airplanes and Rockets
Academy of Model Aeronautics

Tower Hobbies logo - Airplanes and Rockets
Tower Hobbies

Horizon Hobby logo - Airplanes and Rockets
Horizon Hobby

Brodak Manufacturing - Airplanes and Rockets
Brodak Mfg.

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How NOT to Retrieve a Model !!!
April 1957 American Modeler

April 1957 American Modeler

April 1957 American Modeler - Airplanes and Rockets Table of Contents

Some things never grow old. These pages from vintage modeling magazines like American Aircraft Modeler, American Modeler, Air Trails, Flying Aces, Flying Models, Model Airplane News, & Young Men captured the era. I will be glad to scan articles for you. All copyrights are hereby acknowledged.

Every month in Model Aviation, the AMA's monthly publication, there is a "Safety" column that reports on model-related accidents and issues like not charging Li-Po batteries in appropriate containers, not smoking around glow fuel and gasoline, not flipping your propeller with a bare finger, etc. Many moons ago the big safety concern was not flying control line models too near to high voltage power lines. This photo from the April 1967 edition of American Modeler shows some guy attempting to retrieve a radio control model from its landing spot atop a set of telegraph wires. He is standing on a barbed wire fence using a wooden pole to prod it off the lines. The captions asks, "Who knows line voltage?"

I looked it up. Typical telegraph line voltages ran from 500 to 1,200 volts according to the 1922 Railway Signaling and Communications manual. Power line voltage on overhead lines in a typical neighborhood runs from 2 kilovolts to about 35 kilovolts. It only takes about 100 milliamps (1/10 amp) passing through your heart to kill you. A typical hand to hand resistance with a pathway through the heart is 1,000 to 2,000 ohms (for dry hands). Ohm's Law states that  V (voltage) = I (current) * R (resistance), so the voltage required to force 100 mA through your heart would be V = 0.1 * 2,000 = 200 V. If you happen to have sweaty palms, the resistance could be much lower and accordingly a lower voltage would do you in. A high enough voltage could force enough current through a seemingly dry wooden pole to kill you as well.

How NOT to Retrieve a Model

How NOT to Retrieve a Model, from April 1957 Amerrican Modeler - Airplanes and Rockets

What NOT to do to retrieve a model. Who knows line voltage? Never stand on metal wire!

 

 

Posted December 28, 2013