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Regarding Engel tanks- I don't know what the displacemnt of the Robbe boat is, but I'd guesstimate it's at least 1 litre, possibly more- she's a big ol' barge.
Bearing that in mind, a custom engel tank would be required if using a single tank, or the use of twin tanks.
If the latter were proportionally controlled using Markus Reiger boards, then you would have a VERY nice static diver with built in longitudinal trim control alongside depth control.
I have a 750 ml tank and was concerned it might be too small. Would it be possible to modify the tank to handle a litre?
Another option might be to use additional ballast weight, it would sit lower in the water though.
Yes you can modify the tank- you'll need a longer thread, tie bars and tube.
If you lack the facilities, or skill to DIY, then I'm pretty sure Engel will convert it for you, and it'll probably be a lot cheaper than purchasing a new tank.
[Ballast tank]=[Solenoid (blow) valve]=[Air bottle]=[1 way valve]=[Compressor]=
*Compressor sends pressurized air to large bottle while the sub is surface. You need to add trick to prevent compressor from sucking water (i.e. bend top end of vertical inlet to U-shape)
*Compressor will be automatically turned off when air pressure in the bottle reaches preset value.
(I guess kit contains pressure limit switch or pop-off valve)
Now large bottle is pressurized and works like propel gas reserve bottle.
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