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Old 12 October 2012, 07:46   #11
Gaz
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Country: UK - England
Town: Poole
Boat name: Spearfisher
Make: Bombard
Length: 3m +
Engine: Outboard
Join Date: Jan 2011
Posts: 35
Quote:
Originally Posted by Scarlet-Jester View Post
First day out on Sunday. Went down to Poole harbor and conditions were ideal for a first run. Filled her up with the entire family, chilly bin for lunch and the obligatory buckets and spades. Went well overall but she would not get onto the plane and when you gave her some throttle the floor would push up at the back. I am presuming due to a lack of pressure in the floor. The standard foot pump seems completely inadequate as after over an hours pumping did not seem to make anything harder. On emptying out the water before getting her on the trailer I found a small line of bubbles coming out of the floor right on the middle of the seam between the two sections – seems to be the thinnest part. I think she has been run like this for a while as one of the floor straps has torn off the hull completely and the other (both at the rear) is coming off as well - signs of a very poor repair being undertaken. Motor went very well although not able to open it right up but didn’t miss a beat.

She seemed to take on quite a bit of water and on close inspection there is signs of silicone at the back where the transom meets the floor and hull but only on the port side. The elbow/circular (?) patch on the outside of the transom has defiantly come away and will be letting water in. A few repairs to make!

Few questions.
1. How would you repair the original seams? Would you remove the offending section/piece/patch and re-glue? Or put more on over the top?
2. I presume detecting leaks is a matter of using soapy water and looking for bubbles?
3. Would I use the same glue for re-attaching the floor toggle as I would for patching?
4. What solvent do I use to remove old glue?
5. Should I expect any ‘bending’ of the tube areas around the transom under throttle, or is this a lack of pressure as well?
6. I presume to detect water leaks you put water in the boat and look to see where it comes out?

Thanks in advance!

Go for the electric high pressure Bravo Pump mate - it will inflate you Aerotec right up to what you need. It really pushes that air in (in a way that you would never do yourself with a manual pump) and turns the boat absolutely rigid. To be honest, I sh*t myself every time I use the Bravo pump, as I'm always convinced it is going to explode my boat. I usually end up taking cover whilst the last bit of air goes in, just in case - but then the pump cuts off when it reaches the required pressure, and I emerge to find a rock hard, deep-v hulled boat that is almost as solid as a RIB.

I've just upgraded my engine to a 25hp 2 stroke, and put a cross bar steering kit and remotes on it, so now it really is just like a RIB.

In terms of weight ratios, pound for pound I think that this set up is probably difficult to beat (bit more tweaking, to stop the water from gushing in over the transom, when I'm going at max chat, and I should be fully sorted).

.

.
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Old 12 October 2012, 07:54   #12
Gaz
Member
 
Country: UK - England
Town: Poole
Boat name: Spearfisher
Make: Bombard
Length: 3m +
Engine: Outboard
Join Date: Jan 2011
Posts: 35
Quote:
Originally Posted by bigscott View Post
Ive had over 40 stone in my 380 and planed easily with the 25 2stroke on the back.

The 380 becomes a pig when the floor goes soft this is my only gripe with the sib.


Scott,

You're the same Scott from DB, right?

Well, if you are indeed the same Scott, them I'm the same Gaz (D) from DB.

How you doing mate?

The guy that sold you that punctured floor needs thumping! That is the most essential part of the boat. When it's working properly the floor should stay hard for months. Mine takes a few weeks to soften up - although I suspect that it is leaking from the valves, so no big deal. But this doesn't matter anyway, as I always put a fresh blast in before I go on the water anyway.

The only snag I'm having at the moment is that water starts to wash into the boat, over the transom, when I am going at max speed, which means that I have to slow down for a while whilst it flushes out.

.
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Old 12 October 2012, 09:40   #13
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Country: UK - England
Town: macclessfield
Boat name: Reach Out
Make: Quicksilver
Length: 4m +
Engine: 30hp Tohatsu EFI
Join Date: Aug 2010
Posts: 301
A few issues with this boat setup.

1\ Floor pressure leaks, floor must be inflated to rated pressure. Not a fan of these hp floors, but I guess they are light for bagging up.
2\ Water coming in from the transom, but more importantly not getting out again. Is the motor leg too low, and splashing back water? An auto bailer of trunk needed. ( bailers work best when planing)
3\ 25 hp not planing with just a few people in? 25hp should plane very easy with this amount of people in, is the prop pitch very extreme? If the prop pitch is right, then it should plane easily, or at feel as if it wants to fold the boat in half trying....

Lots of water in a sib floor will kill the performance, what looks like a few inches could be 100kg of water or much more........

Is motor correct length type, i.e. not too long shafted.
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