Sorry I can't help you much more.
I found a pic of an old one here & by the look of the water line painted on it, it does look like it sits pretty low in the water at the stern.
http://boats.iboats.com/robalo/cente.../34544-ad.html
I wonder is it possible to reposition the fish tank or the fuel tank a bit further forward.
Might pay to let a surveyor or someone assess the boat in person & preferrably in the water.
Most boats under 20ft do sit down in the stern & some I've seen are downright dangerous sitting on anchor fishing in sloppy water. I owned one & other than shifting all movable gear forward, there isn't much you can do.
If you are only using 30 litres a trip, then avoid topping the fuel tank up to the top.
If this looks like the back of your boat, then it looks like someone has removed the outboard well.
http://boats.iboats.com/cgi-bin/mari...&img=1&count=1
If that was mine I would get a pod made up to suit & "bolt" it on after I had rebuilt the stern back up to full height.
Get the pod made up to extend the bottom lines & shape & as wide as you can to get more floatation than displacement.
Anybody else got an idea here?
BruceM

"christos" wrote in message ...

"BruceM" wrote in message ...
I'm sorry Christos, but there's not really enough info for me to comment. I
can only guess what the boat really looks like. Usually in most boats of
that size there are two different drain plugs. One within an inch or so of
the absolute bottom of the boat. This is to drain the below deck compartment
among some other functions like maybe checking if your below deck fuel tank
has sprung a leak!

is a hole for the drain of the hull in the lower point and in the center of the V

The one higher up is for draining the deck area and for washing down after
an outing. On many boats this is slightly lower than the deck because there
is a slight well at the back of the deck to "collect" the water.

the 30 cm holes drain out the mentioned well

Now to contradict that last one, there are more & more boats now being
designed with "self draining decks", with scuppers attached to holes at the
rear of the deck.
The measurements don't mean a lot really because unless I know the deadrise
& lots of other details, then I can't comment.
Why are you concerned? Does it look too low in the water?

yes and water enters inside in the well and also coming on the deck

Are you sure that the 30 CM holes aren't just from the outboard well?
brumer

is from the well but i feel that the boat going to sink and also i cant see water in the well always

the deck is located about 10 cm higher and darin the waters in this well
if i go to the aft and add my weight the well becomes full off water the water start enters in the deck and start flooding a near by, fish well adding more weight about 60 liters or more and make the things more worst.
I DONT KNOW IF THIS CORRECT
i start cutting on the deck holes and i inspect the internal foam for waters
i dont see terrible things
then i remove the foam in the aft section i raise the well bottom about 8 cm higher and relocate the drain holes
also i fit a watertight cover to the fish well.
in the new empty space installed a bilge pump
never i test the boat after that.
the boat is a Robalo US made somewhere 80 to 90 i am not sure is a strong construction and planning fast reaching easy 48 knots in calm wheather with 175 hp engine.
i spend lot of my time and personal effort so i dont want to see my tries to fail
the dead rise angle is 18 degrees and really i dont know what this means
when the boat planning all the v is outside the water almost near to surface


back to you
christos



"christos" wrote in message
.. .
bruce i dont know
i launch the boat in the water and i took following draft
fore 28 cm
aft 40 cm
boat contains 120 liters of gasoline
the strange thing is that the drain holes located at 30 cm height from
keel
and the deck is 38 cm

have you ever seen a boat with this consruction or you can say what is the
weight of the boat with the cargo

christos


"BruceM" wrote in message
...
I give up ! ! tell us?
BruceM


"christos" wrote in message
.. .
thanks all for the reply.

the boat is bought with the motor .
it has a V bottom is a planning hull
is an open center console type and the fuel tank is located in the
center
line
boat is foam filled
the console is located from bow at 2.70 meters
the center of fuel tank is located 3.30 meters from the bow and is 1.8
metrs
long by 50cm by 28 cm
50 kgs batteries is under the console
waterline lenght is 4.92 mt max width 2.03 mt
what is your estimation for imersion of the boat in the salt water

christos


"christos" wrote in message
...
18 feet boat with an outboard motor of 350 pounds at the aft end how
much
will submerged in the water
the boat weights 1600 pounds without engine.
christos