As Subculture mentioned and I agree ,the piston system cost more and more than likely requires the use of a laithe.
Of coarse there is nothing stopping piston tanks from going into multiple subs ,just how much money you want to spend,it can get pricy on all the deferent sizes,electronics ect. necessary to install in variuse sizes of subs.
As I said before It is a very good and acurate system,I illiminated the jack screw and went with just the piston tank and gear pump nothing else.
Still the CG changes that is inevetable unless there mounted vertacly and then its even better.Yet I wounder why full size subs dont employ them,at least none that I have seen?
Getting back to what this thread is about in the first place,if your a novice builder the Engel pumps are good but be prepared to spend sum bucks!
In my opinion even if your a novice still do your best and build your own system as I have for years ,its much more rewarding and cheaper .
In todays economy the added great expense of both the kit and the laithe would be prohivative to the avrage builder and to learn the necessary skills to pull it of..
Personaly I have invested in kits rather than expensive tools that would see very little use,if I need machine work I would farm it out to a profetional ,but so far have not seen the need.
The telemetry system is the ticket for any body wanting to know whats going on with there sub both on the inside as well as out and can be very helpfull in measuring the piston travel,water levels ect.A huge variaty of sensors can be employed or made to suit the hobby.
If you cant see your sub at least you will know what its doing!
I wont leave port without it.
I bet the 2 Captains above would enjoy the benefits of the system and explore all of its potential not to mention aiding in sub safty.
Now we can employ digital and analog telemetry like reaserchers ect. do.