RE: 102" C-130 conversion
Hi Kelly,
Multi-engine planes is where electric power really stands out for unparalleled reliability.
Depending upon your desired performance goals, there are a number of choices. Check out my P-82 Twin Mustang thread in this forum for an initial idea.
The best motor choice may reside in its size or in its ability to use a 3-cell Lithium pack instead of 4-cells. Both the cost and the complexity will drop when using 3-cell packs.
Consider the [link=http://www.hobby-lobby.com/brushless-axi2826.htm]AXI 2826/10 or 12[/link] motor. If we assume excellent performance will be had at 100 watts per pound then at 15lbs, you'll need 1500 watts of power.
Since I am flying a 6lb plane using a single 2826/12 motor (see [link=http://www.hobby-lobby.com/taxicup.htm]Graupner Taxi Cup II[/link]) you should have no problem flying a 15lb plane on four of these motors. Each motor would use its own Jeti 40amp ESC and 3-cell Lithium pack.
What is your desired prop size?