23/07/2016    U30.   Component  Parts 
Right Top- Clockwork Timer Air Release Valve.
Below- Ballast Tanks.

The copper air tank is situated under the timer and engine mounts in the lowest part of the hull,the filling pipe is the one protruding the highest, on the end is a standard tyre valve off an old inner tube.The tanks unpressurised capacity is only 50ml, at 40psi its more than enough air pressure to empty both forward and aft ballast tanks.

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