The battery can be located within the dive module or out in the 'wet' depending on the battery type and your preference. For example the sealed lead-acid gel cells work perfectly fine being in the water. Just be sure to insulate the connections ( e.g. with silicon sealant) so that you do not get galvanic corrosion of the connectors. Some folks, including myself, actually place the batteries in their own 'dive module'. This is very useful for using other battery technologies like NiMH or LiPo batteries which don't really like to get wet.JimRC wrote:1. I've seen references to the WTC remaining sealed for lengthy periods. If it is sealed most of the time, where does the battery go? If inside the WTC, how is it charged without breaking the seal? If outside the WTC, how is it protected from water?
Or is the WTC meant to be opened and closed every time the battery needs to be recharged?
As you surmised all moving parts (e.g. prop shafts and servo rods) that need to exit the dive module need a form of seal. The most common type is an o-ring or a cup seal. Check out Mike's Subworks to see what one of these shaft seals look like.JimRC wrote:2. With the electric motor (I'm planning to use an old RC aircraft motor) inside the WTC, what kind of seal is commonly used around the drive shaft as it leaves the WTC? Bicycle bellows or the shaft through a rubber block with grease inside it? If a bellows, how does this mate to the spinning shaft?
Yup, you'll need to use a radio in the 27 - 75MHz range. The actual frequency depends on which country you are in. (In the U.S. the 75MHz frequency is reserved for surface craft)JimRC wrote:3. I believe the MHz range radio/receivers are best for penetration of water by the signal but these have a long aerial on the receiver. How is the aerial usually arranged inside the sub - all bundled into the WTC or does it extend outside the WTC so it can be straight?
Most everyone place the servos within the dive module and run the servo rods through a bulkhead seal. (See answer to question #2)JimRC wrote:4. How do you water-proof the exit point from the WTC for the wires leading to the servos for the planes?
See answer to question #4.JimRC wrote:5. Plane servos - how are the servos, themselves, water-proofed?
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