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Topics - mikenash

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76


Resorted to my four old friends:

Cutting disc.  Heat.  INOX.  Force

79
https://www.trademe.co.nz/antiques-collectables/other/auction-1602171588.htm?rsqid=c90920c314c24d299cdc03a9f76ea353

Oldengine site says made '54-'68?  So not even particularly old

Just thought I'd mention it in case it is someone's wet dream  :)

And, just as a comment - I suspect the people who are interested in old engines are all quietly dying out?  I see lots advertised here.  All the common ones like the NZ-built Andersons and all the old petrol Listers fall into the "can't give 'em away" category.  I see endless adverts for the magnetos for these old engines - nobody is buying them.  CS Listers still sell well as 5 or 6/1 and twins - but 3/1s are hard to sell unless the are pretty mint.  I think the market is just slowly dying off?

Just an opinion/observation

Cheers

85
Original Lister Cs Engines / an optimist with a 3/1
« on: January 10, 2018, 10:53:20 PM »
https://www.trademe.co.nz/Browse/Listing.aspx?id=1515170100

Didn't even bother putting up an image . . . .

TradeMe is our eBay

He may have an extra "0" on the price?

Will watch with interest

86
Other Slow Speed Diesels / TANGYE - not a barn find, a field find
« on: January 02, 2018, 09:16:09 PM »
Can't call it a barn find - maybe a "paddock find" lol

87
Everything else / more blasphemous solar . . .
« on: December 12, 2017, 07:05:53 AM »
Okey-dokey

it doesn't get any simpler than this . . . .

(there's an old SciFi novel, set way in the future, in which a basic engineering principle is that, in order to ensure across-the-aeons longevity "no machine should have any moving parts"

Here we are then

This is the "solar" part of the solar shower

The black panel is kinda 1600 x 1400 (maybe four foot X five foot)

It's propped up on a post so it's easy to re-orient it for morning or afternoon sun or to shuffle it around when mowing the grass

Pressurised water goes in one end and comes out the other - that other end is attached to a valve in the shower cubicle that feeds it into the shower head (think of it as a second hot tap)

It doesn't store heat or thermosiphon so it doesn't matter which end is "in" or "out" or what the orientation is

The piping is 50 metres of 20mm (3/4") black low-density "alkathene".  It's held onto the panel by a squillion cable ties

Ten minutes of clear sunshine makes warm/hot water.  Fifteen minutes makes too-hot-to-shower water

If you're "on holiday" as I am when I'm up there you can kinda have a shower whenever the water's hot . . .

It provides enough water at perfect shower heat to have a good scrub-up, wash your hair and just stand there for a bit

If the sun is really hot or has been shining for quite a while then the water is too hot.  Open the cold tap in the shower a bit

There is no emergency over-pressure valving or pressure relief valves or any similar device of any kind

There's just some plastic hosepipe, some sunshine, a hot tap, a cold tap and a shower head

This one has only done a couple of summers

The one I had at the last place did about ten

In theory I guess there are all sorts of things "wrong" with it. Can it be that simple?

It works extra well and cost about $50

88
Everything else / blasphemy - woodstoves
« on: November 21, 2017, 07:03:44 AM »
Don't know if this is kosher or not . . .

But I would guess we have a bunch of off-grid folks here

My last three houses have had increasingly-modified woodstoves.  The sort with ovens & wetbacks . . .

But for the "cabin" I am pottering along with, which is my "retirement" project, I decided the way to get the features I want is to build it myself.  So you can get things like the heating-rate of the wetback just right, and the size of the firebox just as you want it . . .

As you can see, it's still in the "build" stages, but last weekend I ran it for an evening after connecting up the wetback (a bit rough as yet) and the heating rate for hot water seems almost perfect

Will pictures show here?  I'll press "post" and we'll see

89
Lister Based Generators / 28VDC generator
« on: November 02, 2017, 08:55:28 AM »

Hi there guys.  I know there are lots of you guys who are very savvy about generators and related (Starfire, you're a candidate for starters)

I recently bought a little generator unit.  It is a four-cylinder flathead Waukesha petrol engine with a four a-section belt drive to a (nominally) 28V generator head which also has a starter winding.  I would guess it was made early in the 1950s, or if it is built later, is of an old design that was kept in production.

I just bought it to use the generator head as it is an open-drive design - I can picture it hanging of one of the  CSs doing a sterling job charging a 24V battery bank

The little Waukesha looks to be maybe 600 or 800cc?  I sold it to someone who likes to play with things like that.

These little units were widely used in aviation, I am told, and this one was on a NZ air base keeping helicopter starter batteries topped up, so the son of the original owner told me.  If I was going to guess I would think the little motor might have worked at around 1500 RPM - maybe a bit more?

The generator drive is geared about 1:2 or maybe 1:1.8, so maybe the generator head is designed to spin around 3000 RPM?

The generator is a solid unit, it'd be 30 Kgs, probably.

I don't know what is the relationship between RPM and output for a generator (as opposed to an alternator) and I'd be interested in any thoughts on what the common wisdom is on this, and on how fast or slow a generator of such an old design should be run

I'd appreciate any thoughts

Cheers, Mike

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