While the idea of an emergency engine is nice and all... it isn't a good idea in reality.
You have a sailboat...if the engine dies, one would hope that you would be able to use the sails. 
If you're too close to shore to safely use the sails, you have an
anchor.
Most sailboats that use an outboard as an auxiliary, like mine, have to have a long or extra long shaft version of the outboard engine. This is not what you want on an inflatable
dinghy.
Most reasonably sized
dinghies that will fit on a Catalina 30 will be happily powered by a 4-6 HP outboard. This is light enough that you shouldn't really have any trouble mounting it or de-mounting it. Store it on a rail-mounted outboard motor bracket, a bit forward of the stern.
__________________
Sailingdog
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Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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