I spoke to a guy that has the GSP Katana with a ZDZ40RV and he said it's slightly over 11 lbs.
I agree with you wholeheartedly...lighter is definitely better. I originally wanted to try an OS 1.60 with a Perry pump but was steered towards the ZDZ.
A 40cc gas may have a slight edge on power but will be 1.5 to 2 pounds heavier
How do you figure? When you add everything up the difference in WET flying weight is only a few oz.
Here's why:
ZDZ40RV w/ignition, switch, 720mah Nimh pack, Pitts muffler, spinner adapter, prop washer and bolts:
61.1 oz (I just weighed mine with a digital scale)
OS 1.60fx: 33 oz
Pitts muffler: 7 oz
Mount: 6 oz
Spinner adapter: 1 oz
Extra fuel: 8 oz
Regulating pump / mount: 1 oz
Total: 56 oz.
That's a 5 oz. difference. Granted you may be able to knock off 3 oz or so by using a lighter mount, so let's say there is an 8 oz difference.
I thought about this for a long time and decided that a 5-8 oz difference was acceptable considering the HUGE amount of power I'd be gaining along with the convienience of gas.
I'd love to try both engines and see...maybe I can coax my neighbor to let me borrow his 1.60 before I stick the ZDZ on the Katana...
-Tom