Transmitter. The Futaba 'Gold' FP-T7FG/K is an old radio, but has been preserved carefully and checked after 18 years. Works beautifully.  Though this radio was never used before, it is better made than new systems!  7 channels capability, 4 channels used at this time.   This transmitter shared also with a 1/60 scale Traflagar class (H.M.S. Trenchant) under construction which will have more operating features requiring the full 7 channels.

Ballast system
The model has a Propel air brush propellant to blow a single ballast tank (Capacity for some 12 to 15 blows) within a 3.5 inch diameter water tight cylinder.  The model is a double hull system. My Zeeleeuw uses a mixer/angle/ and depth keeper developed by Nils Brakeman in Germany to control the X-stern planes. The sail planes are moveable, but are capable of slight angle changes 'manually' on shore if ever needed. All controls for angle and turning are made by the X-stern planes.