[PSUBS-MAILIST] Ballast Tanks

[Alan via Personal_Submersibles]

Hank,
no you just blame it on spell check! It's always correcting my texts to 
how it thinks it should be.
Alan

> On 19/05/2020, at 11:42 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan, Oh man I really need to proof read.  I must have been low on O2 
> Hank
> 
> On Monday, May 18, 2020, 6:42:47 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> I managed to interpret that email & In my calculations I forgot about putting a burst
> of compressed air in to get the water completely out, although I was automatically
> doing that when I was diving.
> A bit of a no brainer now for me to have a free flooding ballast tank. 
> Alan
> 
> On 19/05/2020, at 12:08 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
>> Alan, I know after laughing Gamma I always gave a boat of air to make sure all was open and good.  I could not quantify the amount but know there is not much difference.
>> Hank
>> 
>> On Monday, May 18, 2020, 6:00:12 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Just did some experiments & answered my own question.
>> If you put an upturned glass in a container full of water & push it down till
>> it is just fully under the surface, the water enters the bottom of the glass to
>> a level that is 6% of the volume of the glass.
>> This is less than what I thought. You would only gain 6% more floatation by
>> going from a free flooding ballast to having a flood valve.
>> The pros of having a flood valve are the added floatation & added security that 
>> your sub won't sink if the vent valve fails.
>> The cons are that you would need a much larger valve than the vent valve 
>> & there would be more pressure in the ballast tank when blowing the ballast.
>> Alan
>> 
>> > On 18/05/2020, at 7:45 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> > 
>> > Has anybody got an idea or guess as to how much water comes in to
>> > a free flooding ballast tank? Ie. would it fill up to 1/4 of the volume
>> > of the tank with water? And does this vary much after towing.
>> > Also if you know the volume of your ballast tank that would be helpful.
>> > Am considering inlet valves at the bottom of the tanks as I will be towing 
>> > the sub a lot.
>> > Thanks Alan
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>> 
>> 
>> 
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