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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All trademarks, copyrights, patents, and other rights of ownership to images and
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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Scale Calculator for Model Airplane Plans

This calculator was created to help calculate the copier magnification setting for scaling model airplane (or boat, or helicopter, or car, or anything) up or down.

The process is very simple.

  1) Select an object on the plans you already have (e.g., the wingspan) and measure is using length units
      available in the dropdown box. Enter that value and units (inches, meters, etc.) in the FROM area.

  2) Enter the new length and units that you want the object to be in the TO area.

  3) The % value given in the MAGNIFICATION are is the setting for the copier. It also reports the
       scale value.

Copier control panel magnification settingExample: The length of the wing on the plans you have
                now is 10 inches, and you want to increase it
                to 60 inches. The result is a required copier
                setting of 600%. The scale is 6:1 (six-to-one).

The copier control panel to the right is typical of what you would use. If you are taking your plans in to a copy center like Kinkos/FedEx or Staples, you can tell them what magnification setting to use.

 

 

From To Magnification
Measure the length of the wing on the plan you have with you now and enter it here: Enter the desired wingspan here: This is the percentage setting for the copier (and ratio):

% =

As a real-world example, I have an original Sig Citabria kit with full-size plans that have a wingspan length of 72". I wanted to build a smaller version with a wingspan of 48", so I calculated a magnification value of 72/48 = 66.666%. Since the copier at Staples only did integer magnification values, I told them to do a 67% magnification. That resulted in a wingspan of 48.24 inches - close enough!