Ramon Arellano's photostream

The old engine and cowling made by my father.

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Uploaded on Oct 12, 2008

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

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Uploaded on Oct 12, 2008

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

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Uploaded on Oct 12, 2008

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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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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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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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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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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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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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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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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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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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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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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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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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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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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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