mvweebles
Guru
- Joined
- Mar 21, 2019
- Messages
- 7,780
- Location
- United States
- Vessel Name
- Weebles
- Vessel Make
- 1970 Willard 36 Trawler
In his early days when he was cruising a smallish sailboat, Nigel Calder had a somewhat similar methodology but he overlaid ease of carrying spares and ease of having a spare shipped in addition to probability and impact of failure. In a simple example, he would carry impellers/seals but not a replacement pump - if a shaft broke (improbable), it would be shipped.One thing I have found to be a useful exercise is to create a break/recovery analysis document. It’s just a list of important systems on the boat - not just electronics - and a thought exercise about what happens if it fails. The two key questions are
1) what’s the scope of impact that the failure causes? What else stops working? So for example, if your gps fails, you also lose your position on your charts, might lose your Auto pilot, don’t have emergency position for VHF distress, etc.
2) what are you going to do about it? This can range from “do nothing”, to “call sea tow”, switch to a secondary gps, replace with a spare, etc.
And answer all this in the context of how YOU cruise. That will cause widely different answers. The results can help you decide where you want redundant devices, what spares to carry.
Things like a failed fresh water pump, or a failed toilet may be much more of an issue than a failed radar, for example. And for a lot of people none of it may matter much since you’ll just head home. And fix it later.
But that's a really interesting method TT. If you have something you're comfortable sharing (or perhaps a link on your blog), I'd be interested to read through. Sort of a few moves ahead in chess I suppose. An art I never mastered.
Peter
Edit - you mention impact of a failed head. Amen. My macersror died a couple days prior to departing SF for Ensenada a couple years ago. No way was I leaving with two crew and no suitable head. I also had a faucet cartridge on a shower valve fail, though not catastrophically. Net was water pump had to be turned off between use to prevent water loss from shower. I now carry spare faucet cartridges.
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