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Re: [PSUBS-MAILIST] dome hatch lift force



Take also into account that when you (and others) are inside the sub the heat will warm up. This will cause the air to expand and create additional upward pressure.
 
 
P1*V1      P2*V2
----------  =  ----------                                          T= temeperature in kelvin. 0 degree celsius = 273,15K
   T1           T2


 
2009/11/4 Alan James <alanjames@xtra.co.nz>
Just calculated the weight of water at the point of total emersion
as being 22.343 kg, so that would leave a maximum lifting force
of the dome against its mounting at 6kg wich isn't much to counter.
Dome- 550mm x 35mm thick x 275mm high.
Regards Alan
----- Original Message -----
From: Alan James
To: personal_submersibles@psubs.org
Sent: Thursday, November 05, 2009 2:52 AM
Subject: Re: [PSUBS-MAILIST] dome hatch lift force

Thanks Oystein & Jens,
I was just getting an idea of the upward force on the acrylic
dome attachment mechanism, wich in my case would be
about 27kg (550mm dome) minus the weight of water on it at the point of submerging. (more calculations).
Regards Alan
----- Original Message -----
Sent: Wednesday, November 04, 2009 11:37 PM
Subject: Re: [PSUBS-MAILIST] dome hatch lift force

F(N)=int.pressure(Pa)*(Area_int.hatch (m^2) Internal upward force
F(N)=ext.pressure(Pa)*(Area_out.hatch (m^2) = External downward force
 
In addition the self weight of the hatch will cintribute to downward force.
2009/11/4 Alan James <alanjames@xtra.co.nz>
Hi psubbers,
I'm trying to calculate what the lifting force will be on the
dome in my hatch when it is just submerged; but aren't
quite sure what I have to take into consideration to calculate this. Any thoughts on this?
Thanks,  Alan 



--
Vennlig hilsen
Øystein Skarholm



--
Vennlig hilsen
Øystein Skarholm