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Search: Posts Made By: Leftbrainstuff
Forum: Gear & Maintenance   04-13-2015
Replies: 56
Views: 4,452
Posted By Leftbrainstuff
good engineering debate

Airplane wings flex so they can absorb energy. There is a dynamic fatigue limit based on peak load and number of cycles that we design for.

Bungee cords stretch to avoid subjecting the heart to...
Forum: Electronics   04-01-2015
Replies: 3
Views: 417
Posted By Leftbrainstuff
I drive my pactor through a serial to usb...

I drive my pactor through a serial to usb adaptor. I then manipulate the pactor via the airmail app using the terminal popup. (the command line)
Forum: Gear & Maintenance   04-01-2015
Replies: 10
Views: 1,038
Posted By Leftbrainstuff
We use our handheld depth sounder from our...

We use our handheld depth sounder from our dinghy. It's only really practical for sounding around our mooring to find the shallower or deeper mooring spots.

We've used it in Angel Island at Ayala...
Forum: General Discussion (sailing related)   03-24-2015
Replies: 23
Views: 1,638
Posted By Leftbrainstuff
dodgy contract

You were right to refuse to sign. There is an inherent risk in any business which implies the owner assumes some liability. How much is one for the lawyers to articulate.

It is probably not even...
Forum: Gear & Maintenance   02-26-2015
Replies: 88
  Sticky: Adjusting Your Rig
Views: 58,342
Posted By Leftbrainstuff
propellor hat approved

Nice technical rig tuning post.

Just to clarify a few basic engineering principles.

Engineering strain is dimensionless. So multiply by length to calculate actual stretch to achieve a certain...
Forum: Gear & Maintenance   06-27-2012
Replies: 10
Views: 741
Posted By Leftbrainstuff
Epoxy Failure

Adhesive joints fail when subjected to peel loadings and flexing of the deck will create this type of loading. A mechanical joint is required for your application such as screws or a routed wooden t...
Forum: Diesel   06-08-2012
Replies: 14
Views: 4,062
Posted By Leftbrainstuff
valve to rocker clearance

Set em to spec. Others have provided good advice but if you find they're still too noisy check for any uneven wear between the contact surfaces.

You might need to regrind the valve stem in...
Forum: Gear & Maintenance   05-24-2012
Replies: 11
Views: 3,017
Posted By Leftbrainstuff
control of distortion starts during design

Distortion can be managed by fitup and by weld sequencing. Any competent tig welder should have no problem with controlling distortion. Without exact details i can't provide specific advice.
Forum: Seamanship & Navigation   03-01-2012
Replies: 26
Views: 2,701
Posted By Leftbrainstuff
pendulum effect

Conservation of angular momentum can be visualised in a playground by watching how kids slow themselves spinning by shifting their centre of mass outward on those spinning poles.

On a sailing...
Forum: General Discussion (sailing related)   11-17-2011
Replies: 111
Views: 14,036
Posted By Leftbrainstuff
Sailing in Decline?

Using Google to measure the popularity of sailing is not statistically relevant as keyword search is quickly abandoned for less noisy and more useful means to find information.

You also need to...
Forum: Diesel   11-13-2011
Replies: 11
Views: 2,532
Posted By Leftbrainstuff
overheat damage

Typically when you drastically overheat an internal combustion engine you have 2 potential issues. The first is loss of oil control ring tension. Secondly pistons can start to touch the cylinder...
Forum: Diesel   11-11-2011
Replies: 11
Views: 1,092
Posted By Leftbrainstuff
Diagnosing Fuel Problems

Before spending a fortune there are some simple checks you can do to identify the root cause.

Firstly check the no load flow rate. This will allow you to see if you can flow enough fuel and...
Forum: General Discussion (sailing related)   11-03-2011
Replies: 30
Views: 2,183
Posted By Leftbrainstuff
bogus warnings

I've had feedback recently that some windows anti-virus products seem to be using their blacklists to list sites as bogus or in some cases to restrict site access.

I suspect treachery by certain...
Forum: Gear & Maintenance   11-01-2011
Replies: 3
Views: 606
Posted By Leftbrainstuff
HDPE water tanks

High density polyethylene is the, usually black, plastic you see being used for irrigation use and some quite large pipelines.

It's very durable, safe to drink or eat from and relatively easy to...
Forum: Diesel   10-27-2011
Replies: 7
Views: 1,340
Posted By Leftbrainstuff
Running on Oil

Many years ago it was possible to run many diesel engines, with the old style pintle injectors, on anything from sump oil ro used cooking oil. With any of the modern 'clean diesels' your options are...
Forum: Gear & Maintenance   10-27-2011
Replies: 12
Views: 15,347
Posted By Leftbrainstuff
Grinding Fibreglass Hints and Tips

If you're going to be doing a lot of grinding you might want to consider air grinders like most body shops will use. They're lighter and stop spinning quicker so you'll be more productive.

Forum: General Discussion (sailing related)   10-26-2011
Replies: 10
Views: 3,895
Posted By Leftbrainstuff
Hot Plate for HDPE

Tes HDPE is weldable. Full strength joints are achieved in pipelines. These are the black poly pipes you see. A spexial hor plate is used with axial clamps to apply pressure. The joint is a solid...
Forum: General Discussion (sailing related)   10-19-2011
Replies: 43
Views: 3,236
Posted By Leftbrainstuff
Motorsport, Military Experience

I've found my background in the motorsport industry to have been great preparation for maintaining, improving and fixing any yacht problems from composite, electronics, mechanical, structural,...
Forum: Boat Review and Purchase Forum   04-26-2011
Replies: 7
Views: 3,494
Posted By Leftbrainstuff
I like the Waiquez Amphora. The following link...

I like the Waiquez Amphora. The following link might help you to locate some appropriate makes and models. hxxp://
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