Motor cooling and fire monitors which run fro an old 6 volt car window washer pump.
Cheers Colin.

what are all the pipes at the back where the rudder for

Here is my 34 inch. Built early 60's and still in regular use.
Cheers Colin.

yes my tapes missing bit

Surely you mean 46 inch.
That's the 1/12th scale version.
Or they did a 34 inch which was 1/16th scale.
I have plans for the 1/16th version.
Cheers Colin.