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| Martin's Bipe is my second pager-powered plane, 8" wingspan. I've always liked bipes, and the frame-profile fuselage looks better than a stick. The pilot helps too. With the lessons learned from the Mono, the Bipe flew quite well from the outset.
The tricky part of this one is the rudder and elevator actuators. They are "in surface" for lightness. However, with carbon rod construction you can't let them in to slots in the control surfaces as you can with balsa. I also wanted to use thread hinges and mutual centering. The final arrangement turned out quite neat, but is not easy to assemble. There are pictures below, and there is some information about it in the Techniques section. I have several hours of flight time on this plane and the motor is still going strong.
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| Bipe Pictures |
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Martin's Bipe
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Bipe on carpet
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Bipe in flight
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Bipe in flight 2
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Actuator detail
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Tail section
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| Bipe Video |
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Martin's Bipe
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Bipe Specifications
| Wingspan |
7.75" (19.7 cm) [8" flat] |
| Chord |
2.0" (5.1 cm) |
| Wing Area |
30.0 sq.in (193 sq.cm) |
| Weight |
0.36 oz (10.3 grams) |
| Wing Loading |
1.73 oz/sq.ft (5.34 g/sq.dm) |
| Motor |
MK06-4.5, 6mm, 4.5 ohms |
| Gears |
6.5:1 Falcon MOD 0.25 in homemade gearbox with two ball bearings |
| Propellor |
3.1" (80mm) Homemade carbon, based on modified U80 |
| Battery |
80mAH LiPoly |
| Radio |
JMP Combo |
| Antenna |
1 piece 38 awg copper, 6cm + 28 turns around 5mm straw + 18cm |
| Actuators |
Homemade coil 4mm ID, 44awg, 50 ohms, 3mm x 1mm N45 Neodymium magnet |
| Construction |
Carbon Rod, mainly 0.020" (0.5 mm) and foodwrap covering (Reynolds Wrap) |
| Control |
Rudder, Elevator, Throttle |
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| Bipe 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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