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I had to wear
earplugs daily for years around the hydraulic systems on a submarine. If
I had pursued a graduate degree in acoustics, my focus would have been on
reducing this noise for the Navy for our nuke submarines. Instead I
elected to go out and make some money. The hydraulic noise in a small
submersible quickly gets unbearable. Place regular
off-the-shelf motors in a metal housing with mechanical or flexible seals.
Later K-subs went to this method and moved away from trolling motors. For
the size of your submersible, you are going to need big motors and lots of
batteries for any duration. There is a method to calculate
cross-sectional area and skin area to calculate the necessary HP for a given
speed. Shaft, flex-joint, seal, and prop losses also have to be added to
this along with an additional HP% for safety. Pick up some naval
architecture books and they will assist you with this. You will find that
you will have to tow or carry your submersible out to most dive sites as the
batteries have limited range. R/J2 Respectfully, Jay K. Jeffries Andros Is., It is the mark of an educated mind to be able to
entertain a thought without accepting it. From: owner- Thank you Jay for fixing the misspelled word in my subject. I realized
it was misspelled as I sent it. so as it is a solution to rotating shaft seals
hydraulic pump sys it is not efficient.
I was also wondering about the flow noise. have you witnessed this noise? What
kind of bat life can be expected out of that sys. In theiry I would be loosing 60-70% of my possible range. What
would be, in your opinion, the
best way to drive a sub. and I am sure you are going to say trolling motors, but what are other
over the counter options? If there are any. I would like to avoid towing for most of the time. I
know I keep asking ques that you have heard before. maybe one day I can do this
for others. From recent
reading for my Naval Architecture program, hydraulic powered propulsion system
are one of the most inefficient ~30% of pump drive shaft HP makes it to the
propeller. As to noise, you can go through all the problems of sound
isolation but there is still excessive flow noise. R/Jay Respectfully, Jay K. Jeffries Andros Is., It is the mark of an educated mind to be able to
entertain a thought without accepting it. From: owner- someone mentioned that hydraulic
drive sys being loud inside the sub. is this true? and if this is true could
the noise be reduced by mounting the motor and pump on rubber mounts and insulating?
still considering hydraulic instead of sealed assembly "I have found a bolt
up solution in granger catalog". many have said that they get plenty of
power from the hydraulic
system. efficientcy
for extended use is more my concern. Check Out the new free AIM(R)
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