Contest-minded aeromodelers, or for that matter competitive
types of all disciplines, are most often the people who advance the state of the art in any
field. Never content with good enough, they continually strive to come up with
new and better ways of doing things. That's not to say everyday sportsmen don't innovate;
they just don't usually do it with the vim and vigor of competitors. Although I cannot
know for sure, I suspect that the tip offered here for a suggested way to carve rubber power
free flight propellers to maximize thrust under a continually changing amount of torque from
the twisted motor is the result of such competitive experimentation and analytical thought.
Notes from the Workbench
By Ray Weeks
![Header, Notes from the Workbench, February 1942 Flying Aces - Airplanes and Rockets](../air-trails/images/workbench-notes-flying-aces-february-1942-1_small.jpg)
Assembly Board
![Model airplanes assembly & alignment board - Airplanes and Rockets](../air-trails/images/workbench-notes-flying-aces-february-1942-2_small.jpg)
A small board painted white and rules off with horizontal and vertical lines is a great
aid in assembling models. The component parts of the model are readily lined up in this manner.
Draw lines 1/4" apart with inch marks slightly heavier. Bristol Board may be substituted and
tacked on workbench when needed.
Wheels and Pants
![Wheel pants made from peanut shell - Airplanes and Rockets](../air-trails/images/workbench-notes-flying-aces-february-1942-3_small.jpg)
For small scale models are made thusly.
Razor Blades
![Modify straight-edge razor blade for corners - Airplanes and Rockets](../air-trails/images/workbench-notes-flying-aces-february-1942-4_small.jpg)
Break razor blades as shown for sharper and more efficient cutting edges.
Head Rest
![Pilot head rest from upholstery pin - Airplanes and Rockets](../air-trails/images/workbench-notes-flying-aces-february-1942-5_small.jpg)
Upholstery tack
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Lathe
![Hand drill used as lathe - Airplanes and Rockets](../air-trails/images/workbench-notes-flying-aces-february-1942-6_small.jpg)
A small hand drill can be used to advantage in the final sanding of small parts.
Bearing
![Rubber power thrust bearing - Airplanes and Rockets](../air-trails/images/workbench-notes-flying-aces-february-1942-7_small.jpg)
Common pin thrust bearing
Note: Adjust model for glide - alter line of thrust for power flight
Prop Hubs
![Make prop hubs - Airplanes and Rockets](../air-trails/images/workbench-notes-flying-aces-february-1942-8_small.jpg)
Hubs cut down in rear - at start of flight blades tend to flatten horizontally, resulting
in loss of pitch and waste of power.
Hubs cut down in front - blades tend to increase their angle and results in greater pitch
making use of first surge of power.
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Posted September 9, 2017
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