I've had one with a tankless Golden Bee (used a product engine style plastic backplate) and one with a Norvell.  The 2nd one is faster, but they both flew well.  The Baby Clown is a great flying 1/2A.  Get the CG set and have a ball!   

Fred

Hi Joe,   Try both engines and have fun.  Then save the faster engine for your lil Skyray so you can race with us this fall.

Larry...thanks for the reminder on the Fall Lil Skyray races.   I need to get some wood cut for the Lil Ray and squeeze the build in between the larger projects

Joe

Joe, with both engines being identical in size, shape, weight and mounting makes it very easy to interchange them at the field in a few minutes, so which one should not be a large issue.

As to which first, I suggest the single port Golden Bee to start with.

Paul has good advice. Better to run them both before you get to the field.

Here's to your maiden flight!

Robert

Paul...Robert, thanks for the insight.  I have never run these engines, so need to get that done.  On fuel... the only high nitro fuel I have is S&W 25% that I run in a YS140 RC plane.  it is 20% oil content,  50/50 Klotz/castor.  Do I need top add some extra castor for the Cox engines?

Joe

That fuel mix should work fine. IMHO the Golden Bee should work better because it has the stunt vented tank, and the small Baby Clown should not need more power. Good luck whichever way you go.

George