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Old 12 November 2009, 11:00   #11
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Mark - I notice your rib is a Porters rib as is mine. I have attached a photo of how mine was done by Porters it has the small drain in the sump for emptying when on trailer and a trunk at deck level for when under way. I also have fitted an auto bilge pump in the sump and hardly ever have to use the trunk.

Keith
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Old 12 November 2009, 12:05   #12
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Mark - I notice your rib is a Porters rib as is mine. I have attached a photo of how mine was done by Porters it has the small drain in the sump for emptying when on trailer and a trunk at deck level for when under way. I also have fitted an auto bilge pump in the sump and hardly ever have to use the trunk.

Keith
Keith,

Many thanks for your input. I now know what and where, I hope someone will be along soon to advise how.

Mark
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Old 12 November 2009, 13:26   #13
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There's been a few people fitted their own on here. As far as I know (never done it myself) you need to find the best place for it to go. Drill a hole big enough and then seal that hole with something like sikaflex. Fitting the kit from RIBshop should be very straight forward.
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Old 12 November 2009, 13:55   #14
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I sealed the hole in my transom with resin first then put sikaflex in the hole to seal it completely.
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Old 12 November 2009, 14:44   #15
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very important to keep the plywod transom core dry...
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Old 12 November 2009, 15:05   #16
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Some RIB manufacturers, eg Osprey, use a length of pipe (68mm downpipe, or 82mm soil pipe) through the transom, seal it in place and stick the trunk to the bit that protrudes out of the back of the transom. Others, eg Ribcraft & Avon, line the hole with GRP and use a trunk with a flange which is screwed to the outside of the transom.
Whichever way you decide to do it, cut the hole out with a good sharp core cutter. If you decide to use some pipe to line the hole, then drill the hole horizontal, rather than perpendicular to the transom face, to keep the trunks horizontal when deployed. Stick the pipe in place with plenty of Sikaflex, to prevent any water ingress.
If, on the other hand, you decide to use a trunk with a flange, then the angle of the hole cut out is less important. In this instance, I would cut some 2" wide strips of chopped strand mat and lay up 2 layers inside the hole against the plywood core, then finish it off with some flowcoat.
If you think all this may be beyond your capabilities, it may be worth having a word with Ribcraft in Yeovil, to see if they will do it for you.
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Old 13 November 2009, 03:53   #17
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If you think all this may be beyond your capabilities, it may be worth having a word with Ribcraft in Yeovil, to see if they will do it for you.
Many thanks Dai, just of to get some hole cutters, in for a penny and all that!!!
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Old 13 November 2009, 04:30   #18
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Nice one!
Remember my old man's rule in these matters:

'Measure twice & cut once'
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Old 13 November 2009, 04:40   #19
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Some RIB manufacturers, eg Osprey, use a length of pipe (68mm downpipe, or 82mm soil pipe) through the transom, seal it in place and stick the trunk to the bit that protrudes out of the back of the transom. Others, eg Ribcraft & Avon, line the hole with GRP and use a trunk with a flange which is screwed to the outside of the transom.
Whichever way you decide to do it, cut the hole out with a good sharp core cutter. If you decide to use some pipe to line the hole, then drill the hole horizontal, rather than perpendicular to the transom face, to keep the trunks horizontal when deployed. Stick the pipe in place with plenty of Sikaflex, to prevent any water ingress.
If, on the other hand, you decide to use a trunk with a flange, then the angle of the hole cut out is less important. In this instance, I would cut some 2" wide strips of chopped strand mat and lay up 2 layers inside the hole against the plywood core, then finish it off with some flowcoat.
If you think all this may be beyond your capabilities, it may be worth having a word with Ribcraft in Yeovil, to see if they will do it for you.
I think I explained it far better than you did
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Old 13 November 2009, 12:43   #20
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Also don't forget to Mask the area and to drill from both sides to prevent the gel coat "Scabbing" i.e when the centre drill "Pilot" is through let the hole saw cut slowly on one side for a few Mil's then cut through from the other side, if that all make sense
Oh and yes take is slooowly
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