Are the mounting patterns for motors universal for like size motors?  Is it pretty easy to switch brands without much modifications? 

Guys
The defacto front mounting hole spacing is a 25mm diameter circle, not all manufactures comply with this but the Plettenberg, AXI, Scorpion, Hyperion all use 2 or four holes on a 25mm diameter circle or a 12.5mm radius.
Norm

Here is a bulkhead for mounting either the E-flite 25 or 32 for a front mount. 
the motor mount itself is made of G10 fiberglass plate that is 1/8" thick.  The material is available from McMaster & Carr for about $20 a sq. ft.
Alan Resinger

Here is a bulkhead for mounting either the E-flite 25 or 32 for a front mount. 
the motor mount itself is made of G10 fiberglass plate that is 1/8" thick.  The material is available from McMaster & Carr for about $20 a sq. ft.
Alan Resinger

Alan,

Do you glue the G10 with traditional epoxy or does it require special handling?

Zuriel

Since posting the picture of the mount in my newest model with the G10 fiberglass plate front mount I've gotten a few e-mails about how I could have the motor set so far back from the front of the model.  The model is the Crossfire design of Bob Hunt and is going to use an E-flite 32 for power.  The motor has a 5mm shaft and I plan on using one of Randy Smith's Aero Products spinners.  Because I fly clockwise I use tractor props as opposed to pushers.  I needed to be able adapt to that spinner.  I ordered a long collet assembly that fits a 5mm shaft from gobrushless.com.  The threaded shaft on this collet has a metric mesurment of 6mm with a 1mm pitch which is standard for 6mm.  The shaft was long enough but did require a spacer to get the spinner backplate properly located.  I also needed a special nut that was half threaded for the 6mm shaft and half threaded for the 1/4 X 28 front cone of the Aero Products spinner.  Jim Lee made the special adapter nuts for the unit.  Hope this helps answer any questions.