Search found 171 matches

by mcgruff
Sun Jan 10, 2021 10:31 pm
Forum: Sea Kayaking
Topic: Introduction and looking for advice.
Replies: 30
Views: 884

Re: Introduction and looking for advice.

Interesting Mcgruff re cold shock I have just started ending a bath with a cold shower, partly for cold shock and partly because it is helpful for the immune system. Yeah I often do that too - as much so I can wash on camping trips as anything else. The only chance of a bath is to jump in a river o...
by mcgruff
Sat Jan 09, 2021 5:34 pm
Forum: Sea Kayaking
Topic: Introduction and looking for advice.
Replies: 30
Views: 884

Re: Introduction and looking for advice.

Perhaps the biggest danger of the sea is how damn cold it can be. People often don't understand how bad survival times in cold water are. https://www.ussartf.org/cold_water_survival.htm As soon as you hit the water, the clock is ticking. Re-entry and rolling are good things to practice in safe condi...
by mcgruff
Mon Dec 21, 2020 3:54 pm
Forum: Sea Kayaking
Topic: Energy drinks
Replies: 37
Views: 957

Re: Energy drinks

I'm not 100% sure but I think eating any kind of food triggers this process.

It's a red line I wouldn't want to go near though, for safety reasons, unless there's an easy exit to shore.

Would be interesting to hear how St Kilda paddlers managed the journey.
by mcgruff
Thu Dec 17, 2020 12:39 am
Forum: Sea Kayaking
Topic: Energy drinks
Replies: 37
Views: 957

Re: Energy drinks

I once had a car which wouldn't start. I called the breakdown guy and waited. Another time, in a small boat, the outboard wouldn't start. I got swept through a narrow channel where wind against current was piling up some big waves. All I had was a single oar to try to keep the bow into the sea. I th...
by mcgruff
Thu Dec 10, 2020 10:13 pm
Forum: Sea Kayaking
Topic: Charging a vhf radio from a lithium power bank
Replies: 28
Views: 582

Re: Charging a vhf radio from a lithium power bank

EDIT: "I'd think the 18650 cells used in most powerbanks probably aren't protected"

--> I mean they probably don't use batteries with extra internal protection. The powerbank circuitry itself will almost certainly have charge protection.
by mcgruff
Thu Dec 10, 2020 7:46 pm
Forum: Sea Kayaking
Topic: Charging a vhf radio from a lithium power bank
Replies: 28
Views: 582

Re: Charging a vhf radio from a lithium power bank

They shouldn't be hard to find. I've got a high-quality, high-current battery in my headtorch with built-in overcharge/discharge protection. I've also got some unprotected cells which I use as a portable powerbank (with a Nitecore F1). Protected are probably the best choice for demanding application...
by mcgruff
Tue Dec 08, 2020 9:23 pm
Forum: Sea Kayaking
Topic: Charging a vhf radio from a lithium power bank
Replies: 28
Views: 582

Re: Charging a vhf radio from a lithium power bank

Apart from protection against excessive discharge (mentioned above) the batteries would need individual charging circuits that detect when charging is complete, as they wouldn't all reach full charge at exactly the same time and overcharging can cause them to explode. Good point. If I was experimen...
by mcgruff
Tue Dec 08, 2020 9:21 pm
Forum: Sea Kayaking
Topic: Charging a vhf radio from a lithium power bank
Replies: 28
Views: 582

Re: Charging a vhf radio from a lithium power bank

It isn't clear* that that buck converter has any battery protection in it. AFAIK some batteries have protection built-in but no doubt it wouldn't do any harm to have a second layer of protection. Protection circuits can be picked up pretty cheaply too. One of the challenges would be making a robust...
by mcgruff
Mon Dec 07, 2020 10:52 pm
Forum: Sea Kayaking
Topic: Charging a vhf radio from a lithium power bank
Replies: 28
Views: 582

Re: Charging a vhf radio from a lithium power bank

It should also be possible to DIY a 12V power supply with a bunch of 18650 batteries connected to a ready-made step up converter like this.

That's more or less what you'll find inside a standard powerbank: a bunch of 18650's and a circuit board.
by mcgruff
Sat Dec 05, 2020 2:41 pm
Forum: Sea Kayaking
Topic: Charging a vhf radio from a lithium power bank
Replies: 28
Views: 582

Re: Charging a vhf radio from a lithium power bank

Omnicharge make some small powerbanks with 12V DC and even 240AC outputs. Not cheap though.
by mcgruff
Wed Dec 02, 2020 2:47 am
Forum: Sea Kayaking
Topic: Rudder and skeg on the same boat
Replies: 37
Views: 1117

Re: Rudder and skeg on the same boat

By "unbalanced" I just mean difficult or impossible to hold a course in strong winds. Rudder & skeg influence weather/lee cocking. I suspect that one might work better than the other in tough conditions but you wouldn't want to use both together. I don't really know for sure.
by mcgruff
Tue Dec 01, 2020 12:37 am
Forum: Sea Kayaking
Topic: Rudder and skeg on the same boat
Replies: 37
Views: 1117

Re: Rudder and skeg on the same boat

AFAIK a kayak will be designed for one or the other but not both. It would be nice to get some advice from the boat designer so you can use the boat safely. Without the correct use of rudder or skeg it could become unbalanced in strong winds and handle very badly. Using both together sounds like a r...
by mcgruff
Mon Nov 30, 2020 8:14 pm
Forum: Sea Kayaking
Topic: Power supply for electric bilge pump
Replies: 17
Views: 609

Re: Power supply for electric bilge pump

Has anyone ever tried fitting a bailer like they have in surf skis?
by mcgruff
Sun Nov 29, 2020 8:11 pm
Forum: Sea Kayaking
Topic: Power supply for electric bilge pump
Replies: 17
Views: 609

Re: Power supply for electric bilge pump

AFAIK not every lithium battery is suitable for a high-current device but they will all supply a small current quite happily.
by mcgruff
Sat Nov 28, 2020 11:53 pm
Forum: Sea Kayaking
Topic: Long swim.
Replies: 37
Views: 1957

Re: Long swim.

It looked like the lifeboat could cope with the conditions provided it was handled well. Trying to land at Hastings was risky, as the skipper acknowledged. All the energy in a big sea gets dumped in the surf zone. I was almost yelling out loud at the screen: "make for Eastbourne!" Someone should hav...
by mcgruff
Wed Nov 25, 2020 4:57 pm
Forum: Sea Kayaking
Topic: Good Head Torch Recommendations ?
Replies: 15
Views: 1215

Re: Good Head Torch Recommendations ?

For the past year I've been using a Thrunite TH10 v2 for camping trips. This thing is nuts. On the 2000 lumen turbo setting it's so bright that if you hold your hand in front of the light for more than a second or two you'll get burned. I'm not kidding. At this setting, it has a huge throw. The clai...
by mcgruff
Sat Nov 21, 2020 5:03 pm
Forum: Sea Kayaking
Topic: Long swim.
Replies: 37
Views: 1957

Re: Long swim.

I have had a 1.5km swim in rough conditions after windsurfing gear failure. It is a very frightening experience and you need to keep a very cool head. If you panic, it is probably game over. You can train, choose the right equipment, dress for immersion etc, but this must be the hardest part of all.
by mcgruff
Tue Nov 10, 2020 2:31 am
Forum: Sea Kayaking
Topic: Sea Kayak/surfski/OC1?
Replies: 10
Views: 474

Re: Sea Kayak/surfski/OC1?

The Epic V6 might tick all the boxes.

Open cockpit. Fast compared to most sea kayaks - but more of a hybrid design rather than an all-out racing ski. Tons of storage if you ever get the urge to go off on an expedition.
by mcgruff
Fri Oct 30, 2020 9:19 pm
Forum: Sea Kayaking
Topic: Rolling
Replies: 59
Views: 2229

Re: Rolling

I've got a really strong 180-degree roll. I can do it anywhere in any conditions.

One day maybe I'll figure out the next 180.
by mcgruff
Thu Oct 08, 2020 3:32 pm
Forum: Sea Kayaking
Topic: Zegul Searocket C Core V. Epic 18x performance
Replies: 3
Views: 404

Re: Zegul Searocket C Core V. Epic 18x performance

The Epic rudder is clever.

It *looks* as if it's better protected when retracted - if say you got smacked by a breaker in a rough landing - but I couldn't say for sure which one is more sturdy & reliable in practice.
by mcgruff
Fri Oct 02, 2020 9:05 pm
Forum: Sea Kayaking
Topic: Long swim.
Replies: 37
Views: 1957

Re: Long swim.

There's another way to surround yourself with air, which is to take one of those orange polythene survival bags and hold it open above your head so that the wind fills it. Then pull it over you, round your feet and up between your knees. You are now inside a large orange marker buoy, protected from...
by mcgruff
Fri Oct 02, 2020 8:58 pm
Forum: Sea Kayaking
Topic: Long swim.
Replies: 37
Views: 1957

Re: Long swim.

Many of us can swim 1km in decent conditions. Rough, breaking seas, cold water, already tired (or injured)? Not a hope. IF we were wearing a PFD and suitable clothing for immersion, yes, we might make it. On the few times I've tried, it was surprisingly easy to swim in rough water. Just dive under ...
by mcgruff
Thu Oct 01, 2020 4:23 pm
Forum: Sea Kayaking
Topic: Long swim.
Replies: 37
Views: 1957

Re: Long swim.

IMO regularly practising a 1km swim is more important than carrying a buoyancy aid. I don't want to bob around in cold water (survival times are not good). I want to get out as fast as I can.
by mcgruff
Wed Sep 23, 2020 4:02 pm
Forum: Sea Kayaking
Topic: Yachts and Kayaks Crossing
Replies: 32
Views: 1316

Re: Yachts and Kayaks Crossing

I think there's a simple rule: unless you've contacted the boat by VHF, rude gestures, expressive dance, or your eyes have simply locked across a crowded sea, always assume you haven't been noticed.
by mcgruff
Fri Sep 04, 2020 6:58 pm
Forum: Sea Kayaking
Topic: Shrike versus Night Heron
Replies: 5
Views: 365

Re: Shrike versus Night Heron

Have you seen Bjorn Thomassen's website ? These are strip-plank boats but his comments on the different styles of Greenland kayak might help to explain the significance of different design features. There's also a "build" section which might have useful tips. The Shrike is well-supported here on the...
by mcgruff
Tue Sep 01, 2020 4:14 pm
Forum: Sea Kayaking
Topic: Inchcolm Access
Replies: 4
Views: 425

Re: Inchcolm Access

Asking all visitors to observe #C19 restrictions is reasonable. Reducing visitor numbers to an indoors venue like the Abbey, or toilets, could be reasonable. But if #C19 is the reason given for restricting access, it would make no sense - and it would not be reasonable - to attempt to impose restric...
by mcgruff
Sun Aug 30, 2020 8:30 pm
Forum: Sea Kayaking
Topic: Inchcolm Access
Replies: 4
Views: 425

Re: Inchcolm Access

Sounds like bullshit. Given Scotland's access laws require "responsible" access, it probably is reasonable to ask visitors to observe whatever Covid-19 guidelines are in place at the time - but that's all. They don't seem to have any real grounds for banning visitors. AFAIK a landowner would need a ...
by mcgruff
Thu Aug 27, 2020 11:39 pm
Forum: Sea Kayaking
Topic: Shrike, a lightweight sea kayak for home construction.^
Replies: 624
Views: 64410

Re: Shrike, a lightweight sea kayak for home construction.^

I suspect (without any evidence to back me up) that the networks of wood fibres in plywood would create a much stronger structure than wood dust held together with glue.
by mcgruff
Thu Aug 27, 2020 8:06 pm
Forum: Sea Kayaking
Topic: Drysuit or seperate Cag and Trousers
Replies: 21
Views: 1112

Re: Drysuit or seperate Cag and Trousers

One day I'd love to try Thermocline 4th element. A single layer is said to be equivalent to 2mm neoprene so a full suit plus separate bottoms & top could be worn in different combinations to cover a range of conditions. Double up for maximum warmth. Could easily add an ordinary kag on top for more w...
by mcgruff
Tue Aug 04, 2020 5:21 pm
Forum: Sea Kayaking
Topic: Repair/Emergency kit
Replies: 22
Views: 1055

Re: Repair/Emergency kit

This was impressive - although of course it's an advertising video.



If it lives up to the hype, might even be able to make an emergency hull repair at sea.