First of all, a wild guess on which Lyen you're talkin' here.
http://endless-sphere.com/forums/viewtopic.php?f=31&t=18214
If you've named it, I missed that post. To those still out of the loop, the motor:
http://www.ebay.com/itm/KIT-ELECTRIC-MID-DRIVE-MOTOR-BRUSHLESS-48V-1000W-QUAD-CAR-E-BIKE-/191239305315?pt=LH_DefaultDomain_0&hash=item2c86c03863
. . . .Unless I misunderstood, I was assuming you were using what's been called 'The Big Block.'
The one I've pondered the experiment with:
http://www.ebay.com/itm/BRUSHLESS-MID-AXIAL-MOTOR-48V-1500W-CONTROLLER-E-SCOOTER-E-BIKE-QUAD-BIKE-CAR-/201060585451?pt=LH_DefaultDomain_0&hash=item2ed0250feb
But yours looks more physically substantial. If the 1500w IS as durable as the 1000w, it could peak at 10,000w. Now THERE would be some 'All Hell Breaking Loose.' http://endless-sphere.com/forums/viewtopic.php?f=31&t=19719 But doesn't that thing like more like a Unite 1020? I don't know. . . .
Meanwhile, despairing at the search for a Mongoose, I've devised an alternative to cobble together. It'll cost less that $100 (I've bought what I need for two) and there'll be parts left over. (Wouldn't it be funny if I sold the castoffs for $100?) If I could just have some spare time AND be healthy at the same moment I can get the glider fit together and start devising the powerplant. . . .