Very simple Science Flight Event airplane flying two minutes (the first five seconds of flight are not on video). Takes only 30 minutes to build and is only $10-$15 worth of materials that you can probably buy at the local craft store ($15 if you have to order wood via the web and pay shipping).
See full construction video, with details, here: • Super Simple Airplane ...
Here's a video demonstrating rubber motor winding for 2023-24 SO: • SO Flight 2023-24 rubb...
Trim details are in the comments of the above linked construction video.
Flight Details:
1. 11.125" loop of 7/2022 Tan SS rubber weighing 1.5 grams (.0635 grams/inch) with black rubber Buna N o-ring front and teflon tube o-ring at rear hook.
2. 1,350 turns wound into the rubber motor (90 winder turns on a 15:1 ratio rubber winder) to a maximum torque of 1.45 inch ounces (in oz)
3. 225 backoff turns to a launch torque of 0.42 in oz
4. 180 turns remaining at end of flight for an average revolutions per second (RPS) of 7.75.
5. Propeller is a slightly modified 24 cm diameter symmetrical bladed Ikara with the blade pitch angle increased to be 36 degrees at the 3.0" radius for a 13.70" pitch and a pitch/diameter ratio of 1.46.
6. Dialog in the video mentions a .0644 g/in motor, 103 winder turns and other different specs. The rubber motor, winding and propeller specs in 1-5 above are correct though.
Brian T
National Free Flight Society Education Committee
1 окт 2024
