Re: Vertical speed : was [PSUBS-MAILIST] Re: Test and questions

[MerlinSub@t-online.de (Carsten Standfuß)]

Hi Mike.. 

"Michael B. Holt" schrieb:
> 
> MerlinSub@t-online.de wrote:
> >
> > Okay, unfortunatly the email programm has no formula maker..
> > so I have to descripe them as best as I can ..
> >
> > Vertikal speed          = Vvert (m/s)
> > Overweight/underweight  = Fvert (N)
> 
> Is this the variation from neutral buoyancy?

Yes it is - useful figures are : 
1.) the displacement of one or all the ballastwater
2.) the displacement of one ore all the regulator tank
3.) the displacement of the drop weight/or weights  
4.) combinations of 1-3.) 

10 N equal to 1 Kg (1000 gramms) or 1 Liter of Freshwater
or 2,2 lbs. 

> > Desinty of water        = ro for saltwater 1025 kg/m3
> 
> I've had a lot of trouble finding this number.  Thanks.
> 
> > Water resistands of a horizontal cylinder
> > in vertikal direction with a l/d (length to diameter)= 10
> >         = Cw = 0,82 (for metric units..)
> > Area (medium length  x beam)    = A (m x m = m2)
> >
> > Formula:
> >
> > Vvert = square roots of (( 2 x Fvert) divided by (ro x Cw x A))
> 
> Thanks, Carsten.   I'm working on a program to calculate this.
> As soon as it works, I'll send you a copy.

Not nessesary - the formel is simple - but thanks. 
 
Carsten
> 
> Cheers,
> 
> Mike