Recent content by PeteMcK

In that case, I'm feeling much better about wimping out!

Bollard pull provides only one point on the standard type of prop performance curve (at zero advance ratio, i.e., at 100% slip). If thrust at zero boatspeed is what you're after, then it's a valid point for comparison but it tells you absolutely nothing else about how a particular prop will...

"If you register with this site you can get the empirical results of the tests. (It'll cost you though)" With the publishers' agreement, you can get a pdf of the penultimate pre-publication draft free of charge at http://strathprints.strath.ac.uk/5670/ Freewheeling produces substantially less...

Bejaysus left Jura just after 10am on Saturday so she's probably hit the Mull just as the tide was just beginning to run east. I think the wind speed would be a bit lower then too so she probably got the best of it. Of the boats leaving Jura between noon and mid-afternoon, only North Star...

Congrats to all those who finished. We (Hot'n'Tot) left Jura at 1pm on Saturday, 3rd in Class 3, nipping at 2nd place Nuage's transom, but knowing we'd be hard pushed to make the tide at the Mull. With the wind cranking progressively into the mid and high 20s, we went down from No1 to No3 at...

Re Drag:- Fixed v. Folding (or feathering); locked v. freewheeling. See http://strathprints.strath.ac.uk/5670/ or full research paper at http://strathprints.strath.ac.uk/5670/1/strathprints005670.pdf

Sorry - it's been changed to: http://strathprints.strath.ac.uk/5670/1/strathprints005670.pdf The gist of it all can be gleaned from the sections, "Case Study" and "Concluding Remarks", whilst the differences between folding, locked and freewheeling props can be seen in Figs 6, 8 and 9.

The drag from a fixed-blade prop is very significant (it can be of the same order as hull skin friction in some situations). We've reported research on this at: http://eprints.cdlr.strath.ac.uk/5670/01/MacKenzie_PM_Sailboat_Propeller_drag_Jan_08.pdf The graphs towards the end have the important...

Available new under the Delphi brand from Lucas (LSUK) service depots for £15 ...

Every IRC certificates shows the SSSN for the individual boat to which it applies. You can purchase a copy certificate for any boat from the ratings office. On the other hand, someone at RORC Rating may be able to give some guidance. I know the Achilles 840 (or 9m perhaps) has done well in the...

Try the SeaTeach website. They've hundreds of s/hand sails of all sizes, mostly hanked-on. If you don't know the dimensions, they can probably guide you.

I don't think the M29 was built in very large numbers so your choice might be limited. For the same reason, you won't get too many comments based on first-hand experience here. All I can add is that the Primrose designed M33 in it's various guises was, from the outset, and for many good...

I posted this last year:- http://www.filtrauto.com Click Crosland => Uk => Application => (and, believe it or not) Thornycroft => 90 Crosland code 405 it says. It gives dimensions and a pic too. I ordered 6 from one of my local motor factors - came in at about a couple of pounds each. A...

The Tuff Luff bit is fairly easy. The extrusion will want to stay coiled - easier to fit to the stay with a helper and on a warm day. Obviously a bit of care is required in measurement and cutting but nothing is very critical. And the feeder and pre-feeder will be very expensive to replace if...

That's Lambash alright! I've had it explained to me by a Lamlash diver that the tide runs through the bay north to south for all but one hour of the full cycle and that consequently your boat is almost never going to lie bow-on to the waves, especially when there's little wind.