Right, it’s done. I’ve decided, and about time to since onkudu.com was turning in to a blog about nothing other than bilge pumps.
The previous “solution” I posted (here) was perhaps a moment of madness. While I could have got it to work, it was a complete mess of a job and served no place on a seagoing boat. Still, trying it, and seeing it, meant I could at least rule it out.
In the end, I’ve gone with what Ben suggested (see comments on this post), and put the pumps in tandem.
I initially dismissed that idea since it would mean a reduction in the size of the pick-up pipe for the manual pump: The manual pump uses inch (25mm) pipe, where as the electric pump uses 3/4 inch (19mm). I didn’t want a reduction because it would obviously hinder the flow of water, but having thought about it further, I’ve come to the conclusion that if 1/4 of an inch is going to make any sort of difference to a sinking boat, it will only be in the small amount of extra time spent afloat.
So, from bilge to seacock, the system now looks like this
- Whale Supersub 500 (35 litres per minute)
- 19mm pipe
- Non-return valve, which also converts from 19mm to 25mm
- hand bilge pump
- 25mm pipe to 25mm seacock exit via ball valve.
Kudu’s bilges are usually bone dry, so if this system is ever needed, I’m in trouble (or I fell asleep with the hatch open).
I just need to fit it all now, and before I can do that, I need to cut a new floor and bond it to the hull. Whoever fitted the original floor at Newbridge didn’t do a very good job with wetting the matting, and it didn’t pass Whitworth standards so I’ve removed it (I tapped it with a boot toe!).










