Showing posts with label gavin atkin. Show all posts
Showing posts with label gavin atkin. Show all posts

Thursday, 20 October 2011

Oar length

I've been discussing oar length with Gavin Atkin of intheboatshed. He has received the exciting news that the first Oarmouse has been built to his plans for a fast, stable, easily-built sculling boat that can be made from just two sheets of ply.
The builder, Fred Rodger in the US, says it fulfils all his expectations but needs a skeg to stop it turning too fast. A skeg is under construction. He is also rethinking the outrigger and thole pin arrangement.
Thole pins are very ancient and still used in many parts of the world, mainly in traditional fishing communities. The rope holding the loom of the oar against the thole is called a humlibaund in Scotland and an estrop in Catalonia. 
Fred doesn't say how long his oars are but Gavin thinks they may be too short.
There are lots of formulae for calculating the 'correct' length of oars of varying complexity ranging from a simple 'half the span, times three, plus six inches' (span is the distance between the thole pins) to the widely-quoted Shaw and Tenney equation that you need a computer to calculate.
I personally use trial and error. Start with oars that are too long and take them out for a thrash. Then cut them down by half an inch. Repeat the process until you feel really comfortable. Then go rowing.
With modern oars, you will need to adjust the button that holds the oar in place against the rowlock to maintain balance, but with Fred Rodger's thole pins it will mean simply repositioning the strop.
It is also worth looking at the height of the rowlock. Even a small change in the height will make a big difference to the height of the handles above your knees - raising the rowlocks just a little can transform an uncomfortable and cramped stroke into a lovely casual swing.

Wednesday, 2 June 2010

First Ella hits the water

Ella, Gavin and Norman with Ella.
It's not often you get the chance to snap a boat with its builder, designer and the girl it's named after all in one shot, but here is Norman Fuller, Gavin Atkin and his daughter Ella with Ella, the latest rowing skiff from Gavin's drawing board.
Norman puts a bit of power on.
Ella is a simple flattie, 12ft long and slim, with flotation chambers at both ends and in the middle, which doubles as a rowing thwart. She is Norman's first boat and won't be the last, he says.
Ella was launched at Barton Turf with the HBBR, and proved to be a nice little mover despite the characteristic turbulence behind the big flat transom. On the other hand, the big flat transom gives a lot of buoyancy at the stern which was very handy when I was sitting in it.  Bet the bow went up a good deal, though.
The bow is very fine to minimise the slapping of waves on the flat bottom. The combination of the upright stem and nice sheer makes for an attractive boat. And the plans are FREE - click here to download.
 Easy does it....Ella rows out.