I have a Brison 3.2 and a Fox 3.2 - both excellent engines but I like the brison a bit better for some reason.

Just for your info, I did have my Brison 3.2 mounted in a 26 pound plane, and it would hover it on a zinger pro 22-8 and just barely climb. So, it must be putting out at leasy 26 to 27 pounds of static thrust.

My fox is mounted on a 20 pound plane and pulls it around with authourity. On a 16 pound airframe, MAN that would be SWEET!

No experience with the ZDZ but I have a hard time to believe the 40cc will outperform the 52cc Brison.

There are too many good engines now to choose from, and everyone has a preference. I think you will be happy with any of the well known brands (BME, Brison, ZDZ, Fox, etc).

Andrew