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Re: [PSUBS-MAILIST] question about general design?
Captain Nemo schrieb:
>
> ----- Original Message -----
> From: "Carsten Standfuß" <MerlinSub@t-online.de>
> To: <personal_submersibles@psubs.org>
> Sent: Friday, August 10, 2001 7:34 AM
> Subject: Re: [PSUBS-MAILIST] question about general design?
>
> > "Expensive subs not automaticly good"
> >
> > Carsten
>
> "Inexpensive subs not automatically bad"
"Fast and quick build sub not automatically fast but maybe quick
diver.."
another one :
"If a submarine works great - in general it looks also good."
"If a submarine looks great its not automatically works good.."
The Alvin expirence : "Shut the hatch before you dive.."
The - Hamster - ball - bottom - sub - real - moment - of - inertia :
here Crash Stop way : (be carefull - this is not real maths - is just a
estimate - quick and dirty calculation - ..)
Diameter : estimate 2 meter (6,55 feet)
Volume : 3,1415/6 x D x D x D or 0,5235 x D³
: here 4,1887 m³
Mass : in seawater with a mass of 1,025 x 4,1887 = 4,293 metric t
equal to 4,293/1,016 = 4,22 ts at zero bouancy.
equal to 42930 Newton
Estimate speed : 1 km/h (3280 feet/hour)
equal to 1000 m/h or 16,7 m/min
or 0,277 m/sec (0,9 feet/sec)
Power : 42930 N x 0,277 m/sec = 11892 Watt or - 12 KW -
stored power in the mass moment of inertia.
Power of two person going a step of 1 feet by 1 feet
estimate with :
Weight 2 x 75 kg = 150 kg or 1500 Newton
1500 Newton x 0,3 m = 450 Watt or 0,45 Kw.
Now I make a milkcan calculation :-)
12 kw / 0,45 Kw = 26,7 steps stopway
Distance full stop = 26,7 x 0,3 m = 8 meters or 26 feet.
Good look - nice experience - especially if the seabottom
is not flat..
I have seen a wooden heavy plywood water surface wheel
during a waterbike regatta race between the
european naval/shipbuilding-students.
Two person run this monster - more or less impossible to change
the direction - you have to stop the thing before you can change
the direction - if not and you turn you body direction just a little
the stored power of the inertia came from the side of you body -
- and the wheel move quickly all the times from a
Hamster ball to a washing machines.
Even at start or stop manovers.
Both person goes all the time "arm in arm" to make excat the same
steps - during the first run they don't do this
- if one runs - the other went over board or fall down..
We took the about 0,4 t wheel later onshore - turn at 90 degree to
the ground and use it as beer bar..
This wheel was a great fun for - the visitors.
see you - Carsten
>
> Pat