THE BEST, MOST TROUBLE FREE, AND CHEAPEST ENGINE, WILL BE THE ZENOAH G-62.I SAY THE BEST CHOICE BECAUSE, ALL OF NICK'S HEAVY METAL WARBIRDS ARE DESIGNED AROUND THE G-62.THEY WERE THE MOST POPULAR ENGINE AT THAT TIME.THEY WERE $275.00 AT THAT TIME TOO.LIKE JEMO SAID, THERE IS NO BATTERY OR IGNITION TO FOOL WITH. JUST A KILL SWITCH, AND THATS ALREADY WIRED UP IN THE MAGNETO. THE G-62 IS ALSO THE HEAVIEST SO CHANCES ARE, THAT NO DEAD WEIGHT WILL BE NEEDED. THE CHOICE IS UP TO THE MODELER AND HOW MUCH HE WANTS TO SPEND.