Re: [PSUBS-MAILIST] Bilg pump

[Steven Mills <cirtemoeg@juno.com>]

Pierre and Doug,

I didn't think the idea was far fetched. If I may use an illustration I
experienced during pilot training [again].  My instructor kept two cinder
blocks just behind the forward seats.  I thought this was odd and
asked him about this and was told it was for emergencies in case
the aircraft went into a flat spin or loss of control. He also stated
that
we probably would never have to use them. Hmmm, well, we DID in
one cross-country trip over the Sierras. We hit a wind shear going over
a mountain ridge and dropped 500 ft in a split second. Also, there was
no airflow over wing and control surfaces, so we were in a flat drop.
First time I experienced zero Gs. The cinder blocks floated past us and
my instructor said, quick, grab one and pushed me against the yoke
and my face mashed-up against the window. [ his also ].  We gradually
pitched forward and we got enough air flow for control and ever-so-gently
eased her back up.  Good thing, the ground was coming up awfully fast!!!

My thought is why not just a mechanical ballast mechanism. Two bowling
balls on a short rail forward and aft of COG made adjustable by hand
lever or foot pedal?

Feasible ?

--Steve
 

On Mon, 15 Mar 2004 16:10:25 EST DJACKSON99@aol.com writes:
> Greetings Pierre 
> 
> I use bilge pumps on my home built ROV, and unfortunately they 
> barely do the 
> job and my ROV only weighs about 8 pounds.  See 
> http://jackson.parcabul.com/rov/index.html I am in the process of 
> upgrading my ROV and converting the bilge 
> pumps to use impellers but even then I don't think they would stand 
> a chance 
> of pushing your sub around.  I am going to test a bilge pump to 150 
> feet 
> because I need one on my sub when it is surfaced.  You might be 
> interested in that. 
> It could be used to give a wet or ambient more freeboard by pumping 
> a ballast 
> tank dry once surfaced, consuming battery instead of compressed air. 
>  Here is 
> the pump I am going to test: 
> http://jackson.parcabul.com/sub/shurflow_bilge_pump.htm
> 
> How are you coming on your sub?  
> 
> Kindest Regards
> Doug Jackson
> http://jackson.parcabul.com/sub/
> 
> 
> 
> In a message dated 3/15/2004 1:44:06 PM Central Standard Time, 
> pipo305@hotmail.com writes:
> Hello all!
> 
> A long time ago I saw a R/C sub that used small water pumps for 
> movement. (I 
> saw that on psubs).
> 
> I was wandering, could we use that on our psubs for small position 
> movements? We could use boat's pump (12V) and steer the output in 
> the 
> direction we want.
> 
> What do you thing about that? It could be a good (read cheap) idea 
> instead 
> of minn-kota motors...
> 
> Pierre Poulin


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