Sorry - thought you already bought the fan. Basicly you can bolt an adapter to the byron fan and then mount a motor. They run on 10 to 12S 5000 mah packs and can put out as much or more power than the OS 91 version. Since you already have the fan - it could cost you about $350 - 400 to convert it, and since the Byron fan mounts the same - all you need to do is make some battery supports. Adapters and motors can be bought from EJF:
http://www.ejf.com/

Here is the Byron E conversion:
http://www.rcgroups.com/forums/showt...ighlight=byron

My Byron conversions:
http://www.rcgroups.com/forums/showt...ighlight=byron
http://www.rcgroups.com/forums/showt...ighlight=byron

Others:
http://www.rcgroups.com/forums/showt...ighlight=byron
http://www.rcgroups.com/forums/showt...ighlight=byron
http://www.rcgroups.com/forums/showt...ight=byron+mig