It has been a while since I updated what is going into my XXI now ,a remote operated anchor and winch,2 ea. 5700 mah Lipo packs in the forward compartment and the Eagle Tree Seagul Telemitry system will be set up to minitor the lipos voltage and amps as well as stop alarm.The motorshave temperature sensors and the prop shafts have Hall effect sensors for acurate prop RPMs.
Servo position sensors are built into the system so I use them to indicate and confirm that certain servo switches have engaged likethe dive and surface swich and vent soliniod switch.It is nice to know audibly that these very important items are working.
Also a water alarm to indicate any water intrution into the aft section.This alarm is setable by the user as all the alarms are so that say a continuse Beep is for the water alarm,another type of beeping for say the motor temp or depth thats right!.
Also anew ballast pump has beenemployed that is far superior than the previuse one,I will keep on with the older pump but for hydraulics only.The new pump is very high quality unit made to transfer liquids at a rate of 2L/minute! Thats a nice amount forany sub,itis a gear pump also that has a servicable gear head and largespecial plastic gears,O ring sealed housing with 4 screws,simple easy service.This pump at 12 voltsruns very quite and smothbut most of all it pompswater with a strong suction the pumps specks says it will pull at 1.5 meterhight ,that is prity strong.The flow is reduced by a gear driveof the motor if not this pump would be extramly stong at 12 volts.I realy like the quality of this pumpand will be installing them in all my subs that have the older pump.
It can also beused in the wet with just some sealing withGoop,it justfits into my Aquacasinglateraly or even horzontaly so it will fit into most casings.Run it on 6 volts and stillplenty of water is pumped.
Let me know if you need one.
It has 3/8 in barbed hose niples so a reducer can be used.
I also redesigned the masts from the all up or down platform to theindividual mast hydraulic system I used on the first XXI I built for a customer.
Also to charge the Lipos a dedicated charging circuit is on the outside of the casing in the rear section so that there is no need to remove the casing when chargeing.

When the casing is installed into the sub a window into the casings rear area above the 2 motors threw the sleeve,there I plan to install a voltage /amp digital indicator andLED4 step power indicator,that way at a glance I know that the sub is on and ready for sea.

Also seen in the pictures is the forward end cap with the anchors gear drive motor and U jouint /tuffing box of 1/8 diamiter shaft and bushings,the end has an engagement fitting that engages with the winches input shaft and winch made from Legos,works very smothly and water will never harm it.
The servo moves the planes mechanism also made from Legos,the black disck is a magnet that engages another magnet on the mechanism,this way the entire casing is self contained there are no external servos to get wet and more items can be added like the anchor,both the anchor and diveplanes connct and disconect by simply inserting the casing into its sleave or inserting the casing and its sleave all at once!Everything self alighnes and ready to go,no need to open the front hatch at all.

Dave Amur Sub Yard Happy Navidad