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    Response
    Re: Gato Ballast Tank Test
    I have done further tests on the system. Everything is working well once. Then it all goes wrong. The pump will not prime to refill. I am sure that the solenoid valve is not up to the task. It is being pushed open when the pressure is direct onto the
    piston
    and jams when the pressure is adjacent. I need a much stronger solenoid and one which blocks across the flow. I will have to see what I can find. Still interested in our fundamental test error though Doug.๐Ÿค”
    5 months ago by MouldBuilder
    Forum
    Motor reversing
    Commercial dive sets, like my Akula II (and DIY ones from guys with a fantastic machine shop๐Ÿ™„) use bayonet end caps. I've also seen DIY articles from guys who have used longitudinal studs to hold things tightly together. Trimming (pitch control) is done in my kit using an attitude sensor and hall effect sensor for controlling the dive tank. The hall effect sensor detects the position of the tank
    piston
    . The attitude sensor detects deviations from neutral and adjusts planes and / or
    piston
    accordingly. https://engel-modellbau.eu/shop/en/Submarine-Kits/AKULA-II/Hall-Sensor-for-Compact-Tank-Switch-CTS2-2-upgrade-set.html https://engel-modellbau.eu/shop/en/Sub-Components/Pitch-Control/Pitch-Controller-SPC2.html In Norbert Brรผggen's Model Submarine Technology book (see below) there are instructions on how to build these devices (and more) with circuits, parts lists and layout drawings. Doug ๐Ÿ˜Ž
    7 months ago by RNinMunich
    Forum
    Motor reversing
    Hi Pete, "My problem is simple. Where does the air come from to take the place of the water." I assume you meant 'dive' system and not 'drive' system, a subtle difference๐Ÿ˜‰ Let's go back one step! Where do you suppose the air in the tank goes when you pump the water in? Right ... It gets compressed.๐Ÿ˜ฎ Air compresses easily, water is practically impossible to compress. When you 'blow' the tank the compressed air expands again and helps the pump to eject the water. The small amount of air you have compressed will not alone be enough to 'blow' the tank without the pump. That's why real subs have compressed air tanks and separate compressor systems. It's preferable in models to separate the air / water components. (Just like 'in real'!) That's why Martin is using a balloon, aka bladder. (Oh๐Ÿ˜ฎ that reminds me ... I need a P! Back in a mo!! ...... Aah! Dat's bedda๐Ÿ˜Š As the bladder fills with water and expands on diving (๐Ÿ˜ญ) the air in the tank section is compressed. You mentioned before in a PM venting the air to the other compartments in the boat and then relying on the air so partially compressed to drive the water out again. Sorry but it ain't quite that simple. Firstly: that would be fraught with danger as you then need breakthroughs into the other compartments from the dive tank chamber. These have to be not only securely sealed but also capable of being opened to accept and then vent back the air evacuated from the dive chamber. (If you did this in a real sub you'd probably pop the eardrums of the crew๐Ÿ™Š๐Ÿ˜ญ) So you would need either some very well engineered and precisely machined mechanical valves to control the air flow and prevent leaks and/or a complicated control system, solenoid valves perhaps? Very dodgy! (With apologies to Mr Geezer๐Ÿ˜) The chances of flooding the whole boat are much higher than with a contained system. Secondly; the pressure of the air expelled from your dive tank would be reduced by dissipation within the compartments outside the dive tank. Martin's system is contained within one compartment using the bladder (that word again๐Ÿค” er, Could you excuse me a moment please Cpt Mainwaring!) The system for my Akula 2 (Typhoon) is also contained, but will use a
    piston
    tank. To dive the
    piston
    is driven to the far end of the cylindrical tank, compressing the air behind it as it draws in water in front of it. Exactly the reverse procedure to surface. Only disadvantage of this system is that you have to arrange space down the centre of the WTC to accommodate the drive spindle for the
    piston
    when submerged. Big advantage is that you have full control of the
    piston
    and thus dive depth. Given a suitable programmable TX Periscope depth and max depth could be preset. A max depth Fail-safe controller is also highly recommendable! Have a look on this site, the German model dive system specialist > 30000 systems sold. This is where I got my Akula 2 kit. https://engel-modellbau.eu/shop/en/home/ Also Hall Effect sensors for the dive tank ! Such as you mentioned Pete. They determine the position of the
    piston
    in the dive tank and feed it back to the dive / fail-safe controller. https://engel-modellbau.eu/shop/en/Submarine-Kits/AKULA-II/Hall-Sensor-for-Compact-Tank-Switch-CTS2-2-upgrade-set.html Cheers, Doug ๐Ÿ˜Ž BTW: If you want to understand more about the principles of how submarines work, whether 1:1 or scale models, I can heartily recommend this book- Submarines Models and Their Originals, by Carsten Heintze. Originally published by Verlag Fรผr Technik und Handwerk (VTH) English edition 2005 by Traplet Publications Ltd. ISBN 1 900371 86 3 Or specifically for model submarines- Model Submarine Technology by Norbert Brรผggen (the German model sub guru!) ISBN 1 900371 32 4 Also by VTH in original German and Traplet in English. Should be able to find both on Amazon/Ebay. I've just realised that somehow I have acquired two copies of the latter๐Ÿค”, English edition! If you want one PM me. BTW 2: you can use the electronics of a servo as a mini ESC or even to drive an electronic switch, BUT you will need to beef up the output transistors to handle the current your pump motor will draw, or add a change over relay to the output! If you want to go that way I can help as I did something similar years ago to use as a winch driver. Standard and mini / micro servo drivers are rarely designed to handle more than about half an Amp, esp the mini / micro versions.
    7 months ago by RNinMunich


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