Biplane 01.jpg

Biplane 01.jpg

The old engine and cowling made by my father.

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Uploaded on Oct 12, 2008

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Biplane 04.jpg

Biplane 04.jpg

The fuel engine was a .120 four stroke engine with a 14x8 APC propeller. Barely enough to get this hog off the ground.

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Uploaded on Oct 12, 2008

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Biplane 05.jpg

Biplane 05.jpg

The old fuel tank took approximately 300ml of nitro fuel.

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Uploaded on Oct 12, 2008

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Biplane 07.jpg

Biplane 07.jpg

By coincidence the old and new engines weigh almost the same.

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Uploaded on Oct 12, 2008

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Biplane 08.jpg

Biplane 08.jpg

But the electric motor has plenty more power than the olde engine.

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Uploaded on Oct 12, 2008

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Biplane 09.jpg

Biplane 09.jpg

Here's the downside to the electric motor. Two heavy 4 cell lipo battery packs. A total of 9700 mAh...

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Uploaded on Oct 12, 2008

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Biplane 10.jpg

Biplane 10.jpg

The batteries and ESC together way over 1 kg. That's almost three times the weight of the fuel tank originally mounted in the plane.

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Uploaded on Oct 12, 2008

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Biplane 12.jpg

Biplane 12.jpg

I'm new to motors of this size, so a thorough bench test was necessary. I almost took this table for flight!

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Uploaded on Oct 12, 2008

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Biplane 14.jpg

Biplane 14.jpg

The engine peaked at about 50 amps. That's about 5 times the maximum current of a circuit in a common household.

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Uploaded on Oct 12, 2008

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Biplane 15.jpg

Biplane 15.jpg

The tachometer is showing 6600 rpm, but that's after the the voltage level had decrease by a couple of volts from its max (33V).

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Uploaded on Oct 12, 2008

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Biplane 18.jpg

Biplane 18.jpg

At first I installed the engine with an angle down and to the right to compensate for the propeller...

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Uploaded on Oct 12, 2008

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Biplane 20.jpg

Biplane 20.jpg

The motor with the ESC installed directly underneath. This is the place with best air circulation in the entire plane.

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Uploaded on Oct 12, 2008

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Biplane 22.jpg

Biplane 22.jpg

On-off switch for current to the motor. Each time I connect it a large spark flyes as the capacitors in the ESC start sucking current.

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Uploaded on Oct 12, 2008

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Biplane 24.jpg

Biplane 24.jpg

The ESC doesn't have built in battery eliminator for the receiver, so I had to buy an external one.

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Uploaded on Oct 12, 2008

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Biplane 26.jpg

Biplane 26.jpg

Under the hood. From front to back: The on-off switch for the motor. The external...

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Uploaded on Oct 12, 2008

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Biplane 27.jpg

Biplane 27.jpg

I knew I would have to open and close the hood often (and potentially fast to avoid a fire after a...

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Uploaded on Oct 12, 2008

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Biplane 28.jpg

Biplane 28.jpg

There was plenty of free space in the plane before I mounted the batteries.

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Uploaded on Oct 12, 2008

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Biplane 30.jpg

Biplane 30.jpg

Aluminum frames for holding the batteries. I created these from bicycle bottle holders.

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Uploaded on Oct 12, 2008

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