Keith.
Just had a quick squint on `T internet and decoy ducks can be had to a tenner, so not dear (no they are Ducks!!!!)
There would be two ways to motorise this. Possibly the easiest would be to make a "sub" out of commercial plastic pipe, screw-on ends, and ballast this so that it forms a simple submersible unit underneath the Duck (so the duck does not have to be altered) OR cut up the Duck and put conventional boating gear inside it. The ease of this depends on the decoy construction.
Although this is an attractive idea, it will not be particularly cheap for a one off outing.
Using the cheapest components and having a simple forwards only setup..you may be looking at
motor..£5, propshaft/prop 3, coupling 2, aircraft ESC 10, servo for rudder 5, rudder assemply 10, battery box for AA rechargeable batts 3, radio set 40, and of course the Duck 10 and finally epoxy glue 5.
It all adds up. For those of us who have been doing this for ages , we will have most of this laying around, and radio sets to use, etc etc.and it would not cost too much.
I just thought I would point this out. Unfortunately I am miles away however perhaps approaching the nearest MB club or indeed any r/c club may provide some assistance, someone near enough to help.
Ashley
Edited By ashley needham on 06/05/2017 09:01:53