Thursday, April 20, 2017

Week Three 4/20/2017

Week Three Summary: The original prototype was flimsy, small, and stayed in the air for a very short period of time due to the weight of its construct. A revised, slightly larger model was built today, consisting of straws, string, and thread rather than wooden coffee stirrers. This decision reduced the overall weight by 4 grams, despite the glider having a greater surface area. Ultimately, the new model works better in every way; the frame does not bend and does not require constant maintenance like the original one did and flies straighter. Additionally, there was no guidance string attached. Thus the product resembles a glider more than a kite, and will be thrown between people rather than pulled around a room.
Performance characteristics
Glide ratio: 3
Bend radius: 0
Weight: 15.5g
Glide speed: Variable, more trials needed
Lift: ?
Drag: ?
Dihedral angle: 20 degrees
Wingspan: ?
Dimensions: ?
Surface area: ?
Current total expenditures: $0

Material Concerns: The string at the lab is glossy and frays easily, making it a poor choice of material for any serious design. Thread is sturdier and does not slip as easily, but is still susceptible to breaking under stress. Fishing line and nylon string are being considered as better options, as they provide high strength without adding much weight.



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