Head_Bipe

Planes

B-25 Mitchell
1/48 Scale
8 Channels
P-51 Mustang
1/48 Scale
6 Channels
Shark
2.65", 0.495 gram
Mono-plane
Martin's Midge
3.2", 0.98 gram
Mono-plane
Mosquito
4", 1.3 gram
Mono-plane

July 27, 2005

Here's the Mosquito - wing span 4" (actually 3.7"), weight 1.35 grams. It's basically my Mono4 on a diet.

One weight saver was the 4 mm, 28 ohm motor that I got down to 290 mg by replacing the motor can with a 1/64" ply and 0.010" carbon rod frame, and replacing the shaft with carbon rod. I did add back a small flux ring machined from the can - makes a huge difference to the output power. No gear box either - direct drive to a 1" x 3/4" carbon prop weighing about 20 mg, my best prop yet. Other weight savers included using a lightened PIC chip with my YAPP code on the Leichty Micro and soldering directly to the receiver. I also used 2 g/m^2 mylar - about 7 times lighter than Reynold Wrap.

The only significant design change from the Mono4 is in the vertical stab - it is swept back. The theory is that this gives a small up elevator effect from the rudder when it is deflected either way, as in a turn. Not having an identical plane to compare with, it is hard to tell whether this really works, but it does turn well. It uses a left-handed prop to keep the motor direction normal, so it tends to turn right. I need to add some left thrust.

I called it Mosquito because it sounds exactly like one in flight - that little DD prop really screams, but quietly. It flies on about half throttle.

Mosquito Pictures

1"x0.75" Prop

Motor Housing

Like Mono4

Above

Side

Front

1.3 grams

Mosquito Specifications
Wingspan 3.7" (9.4 cm) [4" flat]
Chord 1.5" (3.8 cm)
Wing Area 5.35 sq.in (34.5 sq.cm)
Weight 0.046 oz (1.35 grams)
Wing Loading 1.24 oz/sq.ft (3.78 g/sq.dm)
Motor MK04-24, 4mm, 28 ohms, case removed, flux ring added, carbon shaft
Gears None - Direct Drive
Propellor 1" x 3/4" (25mm x 19mm) homemade carbon on computer-designed blank
Battery 20mAH LiPoly
Radio Leichty Micro 3 Channel, 27MHz, with lightened YAPP PIC chip
Antenna 4" Litz wire
Actuator Homemade 3mm OD, 51awg, 200 ohms, 1/16"x1/32" N45 Neodymium magnet, 35 mg
Construction Carbon Rod, mainly 0.010" (0.25 mm) and 2.2 g/m^2 mylar
Control Rudder, Throttle

Mosquito Plans
Basically the same as Mono4 with swept vertical stabilizer