Re: [PSUBS-MAILIST] dome hatch lift force

["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 -----

From: Øystein Skarholm

To: personal_submersibles@psubs.org

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