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Micro PoleCat

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This is a great example of a sub 20 gram micro plane. We chose the 2gram 7700kv motor and Biometal servos for this build project because of their low weight.


Specs
Dtrx35 Receiver: DTrx36     Flying Weight: 17 gram
Power Board : 6 Point     Airframe Weight: 6 gram
5A ESC ESC: 3 Amp XP-3A     Wingspan:
AP-03 Motor: 7700KV     Length:
GWS 3020 Propeller: 57mm x 20mm     Bracing: 0.5mm carbon
FullRiver 130Mah lipo Battery: 100Mah     Undercarriage: 0.25mm
Servos: Biometal R1     Airframe: Adapted from Parkzone PoleCat design
Wheels:15mm FiberBoard  

Airframe: 2mm Depron

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The frame as seen here was adapted from photos of the Parkzone PoleCat and altered to allow the wing to fit above the horizontal body section. Depron 2mm foam made for a very light weight frame and to make the tail even lighter the tailplane surfaces are made from 0.5mm Durobatics foam.
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The 7700kv motor was a great choice for this model where weight needed to be kept to a minimum. This motor weighs in at just under 2grams and when coupled with a 57 x 20mm prop it puts out about 16 grams of static thrust. Mounting of the motor required formed blocks of bulsa which were glued around the mounting shaft of the motor and braced to the horizontal and vertical surfaces of the fusealge.

Related Products
AEO-6 7700Kv Brushless Motor

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For good weight distribution the ESC unit and receiver unit are mounted on opposite sides of the fuselage. Here we can see the ESC unit which has been mounted to the fuselage with double sided servo mounting tape and a small block of depron foam to hold it slightly away from the sode and allow for airflow.

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AEO-6 Xp-3A ESC Unit


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AEO-6 Servo Mounting Tape
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This view shows the 0.5mm Durobatics foam which was used for the tail surfaces to keep weight to a minimum. No bracing was needed on these surfaces anf they are held in plave with UHU por glue. Also visible here is the Plantraco plywood control horn. these micro control horns are very light and come in 90deg and 120 deg angle mixed packs. We have chosen the 90 deg angle control horn.

Related Products
AEO-6 0.5mm Durobatics Foam

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Another view of the mounted XP-3A ESC and wiring harness to the motor. Also visible is the Biometal servo used for the Ailerons. These servos weigh just 1.1 gram with the JST connector. However, in the interest of saving weight we have chosen to use the DTRx36 which has no connector plugs. The plugs on the servos have therefore been reoved and the servos soldered direct to the pads on the receiver unit. By doing this the weight of each Biometal servo is reduced to just 0.8 grams.

Related Products
AEO-6 Biometal Servo
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A shot of the power distribution board. We have used this board as a junction box of sorts for the power wiring. On these boards the pads in the middle link to the three holes on each side. By soldering these three pads together and taking the power (Pos and Neg) from the battery directly to these points on the board, we can then distribute the power from there to the various components. In the image to the left. You can see we have used servo wire to take the pos and neg power back to the receiver unit. Power to the board is supplied by the leads coming up through the wing. Power to the ESC unit is carried by the heavier leads leading over to the ESC unit on the other side of the fusealge and these come from the bottom of the power board.

 

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Front view with 57 x 20mm prop showing right an ddown thrust line offset.
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Top View
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Decorating: For decorating we have chosen to do a basic colour scheme with felt pens. Easy and simple. Just experiment and see which pens ink stick to the Depron the best.
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Side view shows the slight curve in the wings which has been made by applying heat (hot water in this case) to the wings and curving it around a bottle.
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Completed

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Showing the mounting position for the Biometal Servo.
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Top View
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All up flying weight with battery.
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The power board
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Power board showing ESC leads from back of the unit.

Flight Video
(This video was taken with our 1080P HD Flight Camera mounted to the frame of a pair of sunglasses)

Reflection:
In this build I have tried a few methods to keep the weight down under 20 grams so I could use the 7700Kv motor as a power unit. The Biometal servos and Depron foam used in the tailplane helped and also allowed for a smaller 90mah cell to be used. However, performance was much improved with the higher capacity 130mah cell and flight performance was not greatly affected by the heavier cell. In all, this plane is a very nice flyer and well suited for indoors or park flying on fin days. The 57 x 20 prop and motor combination ensures that this little beast has enough speed if you want to open the throttle up, but for the most part great enjoyment can be found cruising around at ½ to ¾ throttle