More elephants trunk stuff

[ollyit]

Just installed mine as it didnt have one at all, I burnt out an old drill doing the whole and it took bloomin ages, the revs of the drill its slef kept slowing down the pressure to cut through was on, it nearly stopped a few times and bit back at me at the handle end!!

the 11cm drill bit itself was only just deep enough to get through all the layers, I've now siliconed it all up hopefully it'll work a treat if I need it -
space is a bit limited on the transom now - what shall I seal the new hole with from the inside as I guess when it gets wet it might go rotten? I've used silkaflex at the moment, is there anything better I should be using?

[Scary Des]

silkaflex is good if done right
One thing though it’s a good idea to have the closing string fitted over the top of the transom and on a quick cleat this makes it easy to see if the trunk is up or down and to operate. Des

[Jono]

Might be a good idea to epoxy/glass the cut edges first.

[eupa]

dont want to sound ignorant -- but what the hell are 'elephant trunks"
dont tell me thet are oversized boxer shorts??

Jonathan

[Jono]

Way too easy..........

[Mark Halliday]

Olly

It would be best to seal the hole with GRP as Jono said.
You can get 50mm wide woven tape which is good for this sort of job. When that has gone off seal that with gel coat.

How easily did the glass come off the ply core when you cut the hole?
It may be delaminating if it fell off easily.
Was the ply wet? That might explain why the cutter was binding.
I hate those multi-size hole cutters. I am impressed you got anywhere with that one.

[Jono]

It's this bit... When you lower it into the water, forward motion of the boat enables water to be drawn from the inside, by differential water pressure, in reasonable quantities to empty a partially flooded hull. As it's "floppy" it kind of acts as a none return valve ... does that help?

[Mark Halliday]

Jono



Took me a moment to work out what that was.

[eupa]

sure looks like a cod-piece a la CODPRAWN.

I have dummy bailers is that the same thing??

Jonathan

[Jono]

You mean them things with the "ping-pong" balls in? Yugh..!

[eupa]

Originally Posted by Jono

You mean them things with the "ping-pong" balls in? Yugh..!

no. These have a sort of diaphram that opens up when the pressure inside the boat well is greater than the outside water pressure. Stop teasing me you bastard, you know what I mean...............

Jonathan

[Mark Halliday]

Originally Posted by Jono

You mean them things with the "ping-pong" balls in? Yugh..!

I had one of them. It's now installed in the local land-fill.

[ollyit]

Originally Posted by Mark Halliday

Olly

It would be best to seal the hole with GRP as Jono said.
You can get 50mm wide woven tape which is good for this sort of job. When that has gone off seal that with gel coat.

How easily did the glass come off the ply core when you cut the hole?
It may be delaminating if it fell off easily.
Was the ply wet? That might explain why the cutter was binding.
I hate those multi-size hole cutters. I am impressed you got anywhere with that one.

Cheers mark, that sounds like a good idea - if its any consilation with a boat as small as mine its a pig of a job as theres no room, I sweating like a pig inhaling burning wood/fibreglass fumes,deafened by drilling and fastly catching the tourettes syndrome -

the glass needed a bit of poking, ply was thick, bone dry, and made of many intact layers thanks all for your replies

[jwalker]

http://www.rib.net/forum/showthread....ght=grease+tub


A large radius on the inside face of the transom will increase the flow considerably. And I mean a lot!

[Mark Halliday]

More inspired wisdom for the king of all things holey.

[eupa]

Originally Posted by jwalker

http://www.rib.net/forum/showthread....ght=grease+tub


A large radius on the inside face of the transom will increase the flow considerably. And I mean a lot!

JW - you mean "sink"

Jonathan

[John Kennett]

Originally Posted by eupa

JW - you mean "sink"

A large sink on the inside face of the transom will increase the flow considerably?

A large radius on the inside sink of the transom will increase the flow considerably?

A large radius on the inside face of the sink will increase the flow considerably?

A large radius on the inside face of the transom will increase the sink considerably?



John

[jwalker]

Me too.

[Kernow Buoy]

No!
He means that if you cut a big enough ole in yer transom you will........

Sink!

[jwalker]

Oh I see. That's too straightforward for me.