About this Plan
Zephyr - Rubber sport model. Originally printed in Flying Aces December 1936, this is Abe Bergman's Zephyr.
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User commentsYesterday, after a Thanksgiving dinner with friends, I flew my Abe Bergman Zephyr, built from OZ plans, for them in their front yard under the street lamp. A new rubber motor gave the little model improved performance enough to outfly the boundaries of their small yard, flirting with trees and power lines One of them asked if I wanted to sell it. He wanted it for his son, which would have meant instant destruction. These days it's unusual to even witness a tiny model of this sort, nothing remotely similar available in hobby shops. Takeoffs from the driveway kept altitude under control. Only changes I made from the original 1936 design were a double prop bearing so I could add some downthrust and wheels laminated from two layers of 1/32" balsa. I used a 6" balsa prop with one loop of 1/8" rubber. Hand wound, the flight was good for two circles to the right, then a straight glide to a smooth wheel landing. Altitude was enough to get into danger from telephone lines. Doculam covering I used was too much for the lightweight structure, and so I pre-shrunk the film on a frame and just ironed it to the edges without more effort to shrink it tight, probably no heavier than tissue without dope. Reason for the Doculam covering was so I could fly it at night under the street lamp without fear of dew collecting on the tissue, causing it to warp like a Pringles potato chip. Guess how I know. The model was built a couple of years ago when I realized there was little activity in the Duck Works (my basement) because it was too chilly in the Winter. Yes it DOES get cold in Alabama. And so the UPSTAIRS AIRCRAFT ASSEMBLY AREA was born, an unused bedroom with a banquet table building board, Zephyr being the first model built. Only problem I've had is running up and down the stairs to get tools needed above. It's always something...
DougSmith - 26/11/2016
My daughter also wished for such a butterfly. When I got the plan by Abe Bergman's Zephyr (oz5583), I built three of them [model photo & more pics 004-005]. I like the underpowered behavior of the fliers. The big 8 inch Balsaprop with only one loop 4mm rubber. The loop I have kept so short that after expiration of the force of the rubber does not sag too much and does not fall down in gliding. The Aurora Butterfly has already made a short thermal flight. Only with luck could he be spotted in the cornfield and salvaged.
AndreasKoch - 05/07/2019
First flights from Abe Bergman's Zephyr (oz5583) https://www.youtube.com/watch?v=MxavibLjEU8
AndreasKoch - 17/07/2019
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