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Here is "Bipe4", a half-scale version of my Bipe, at 3.9" (10cm) wingspan and 2.4 grams.
First flight was ROG in the hallway of my house, 6 feet airborne, terminated by the dining table at an altitude of 2 feet. After a few more false starts, I acheived an ROKC (Rise Off Kitchen Counter) into the family room and completed 4 or 5 circuits of the room, about 25ft x 25ft. Then I attempted a figure 8 that was looking good until it met the refrigerator at an altitude of 6 feet. No damage - carbon fiber and food wrap are really strong. This morning was sunny and calm so I flew it on the patio - flies just like its big brother.
I first flew this with Nick Leichty's spectacular 27MHz Micro 3 Channel combo receiver - 3 fully proportional channels with motor FET on board, at 180 mg - that's 0.18 grams total weight! Since then I have switched it to a Leichty Mini that I made from parts from DigiKey based on instructions from Nick, with my YAPP code PIC chip - about 0.38 grams. It now flies virtually glitch free - I can turn the transmitter off in flight and it lands itself.
I was surprised to find that Bipe4 will fly 10 minutes continuously from ROG to touch down on a fresh charge - timed and witnessed by two people independently.
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| Bipe4 Pictures |
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Bipe4
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With big brother
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With big brother
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Bipe4
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Bipe4 Wings
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Bipe4 Pieces
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Tail Assembled
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Bipe4 Wings On
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Bipe4 on hand
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Bipe4 on palm
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| Bipe4 Videos |
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Bipe4 in garden
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Bipe4 Indoors
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Bipe4 Specifications
| Wingspan |
3.9" (10 cm) [4" flat] |
| Chord |
1.0" (2.54 cm) |
| Wing Area |
7.5 sq.in (48 sq.cm) |
| Weight |
0.085 oz (2.4 grams) |
| Wing Loading |
1.63 oz/sq.ft (5.03 g/sq.dm) |
| Motor |
MK04-24, 4mm, 28 ohms |
| Gears |
6:1 Didel MOD 0.2, homebrew gearbox with 2 ball bearings |
| Propellor |
2" x 1.5" (51mm x 38mm) homemade carbon on hand-carved blank |
| Battery |
20mAH LiPoly |
| Radio |
Homemade Leichty Mini 3 Channel, 27MHz, 400 mg |
| Antenna |
4" Litz wire |
| Actuators |
Homemade 3mm OD, 51awg, 200 ohms, 1/16"x1/32" N45 Neodymium magnet, 35 mg |
| Construction |
Carbon Rod, mainly 0.012" (0.3 mm) and foodwrap covering (Reynolds Wrap) |
| Control |
Rudder, Elevator, Throttle |
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| Bipe4 Plans |
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| Plans in PDF format |
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Adobe PDF reader can be downloaded free from |
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