I also have an
Avon "Roll-up" 11.5 ft inflatable
dinghy in a carrying bag. It is about 10 years old but still worked when I used it 5 years ago.
However, hanging a 30HP
outboard on anything other than a "Rigid"
dinghy might be rather dangerous both from a weight standpoint and a power standpoint.
The inflatable dinghy has a tendency to "ripple" or buckle (form a buckle in the floor that raises) as the speed is increased from idle to planning speed. It is quite dramatic until you get used to it. And once the dinghy is out of the
water up on plane - with such a powerful
motor there is also the heightened risk of flipping end over end as
wind forces it way between the
boat and the surface of the
water.
Most inflatable dinghies I know of are limited to not more than 10HP because of these problems. They are just not rigid enough.