"Trading in pork bellies futures began in 1961 on the Chicago Mercantile Exchange (CME) and allowed meat packers to hedge the volatile pig market."
https://www.investopedia.com/terms/p/porkbellies.asp

Place your bets here Gents😉
https://www.barchart.com/futures/quotes/PBY00/overview
Pass the pork belly slices and black eye peas please😛
Eggs and bacon anybody? 😋

"You'd have to have a large set "
Set of what? 🙄 Oh😮 I C,
Cobblers awls!😮
😁

Shame Kiwi - just because it looks a bit like USS Hunley

You'd have to have a large set to climb into that coffin! (or be an extreeeme optimist!)

It sounds a bit like pork belly futures now Martin - never understood those either.

You got it Doug - seems an interesting subject - have a plan somewhere......... But no plans to build it (pun intended) too much else to finish and get a paddler made.

Aha! Do you mean this Peter?
The Welman Midget. Codename 'Wellfreighter'.

I will not say yet just in case it all goes belly up.
But I am starting to get ideas for future projects.

Martin.

I like the Possum idea.

Martin.

Just NOT water-/jet propulsion please JB🙈🙊😮
😁

Hi Martin - is it a wellfreighter ?

Here we go Guys,
This is what I like, might get some fresh ideas.

Martin.

Don't get us started Doug,!! (thinks wonder if I could do something with that dead possum, floats on each foot 'long tail'drive system mmmmmmmm................💡

Wack on Bro👍
Can't wait to see what you come up with this time Martin 😮
Here's some inspiration for others looking for wacky projects😁
https://www.pinterest.de/maurojaviercarrenochao/steampunk-submarine/?utm_campaign=rdboards&e_t=f86fdf50912e45c6ba3359a364dd2b2b&utm_content=645422259036867518&utm_source=31&utm_term=2&utm_medium=2004
Cheers, Doug 😎

Hi JB,
Thanks.
This whole project is a total experiment.
There is no need for speed but as I said it is the only prop that I have.
The motor is also a mystery.
The only thing that I will say at the moment is I have done some water displacement tasting and hopefully it should work fingers crossed!
I don't want to reveal what it is just yet in case it all goes belly up.
It is WACKY though.

Martin.

It will be more for high speed use Martin (perhaps 30 Dia out or in-runner of 900-1100 Kv ) or reasonably grunty brushed motor. as it will have a bit more bite than a std scale type round bladed prop. You can of course run it slower with a smaller motor for a slower boat. It's something you might put on a .25-.30 cc nitro boat or elec equivalent. It will still work no matter what you match it with. You can play with props forever trying to get performance (I had dozens for my nitro boats) but for slower non scale boats,- pretty much what your motor can handle.
John B

I've never come across a LH prop marked as RH as long as I've been modeling boats (scale and nitro racing) I've used props from Graupner to Octura and they have always been marked the same Not saying there are't any but I've never seen them. The easiest way to tell left and right is to look from the back of the prop with one blade at the top, and if the blade slopes/curves away from you and down to the left, it's normally called a LH and vice versa. Mind you most of us who have been modeling for years or running nitro boats can just look at a prop and know in 1 sec.
Strangely enough, people can even get it wrong on big boats. The owner of the 64ft ex RNZAF BPC 100 series HSL here had a new prop made for it after a big re-build, fitted it, and had 4 reverses and 1 forward. The prop had been made RH by mistake and no one noticed!
John B

Thanks JB.
It is the only small prop I have, and I plan on using it on my next wacky project.
So far to date this project has cost me absolutely nothing, as I still have a few bits and pieces lying around. And plenty of ice cream and food containers.
It is not quite working out how I hoped but it is certainly different.

Martin.

Could also be a NQD prop from one of their boats - have a few as they break easily so bought some assorted ones on Ebay - some are marked some are not. Cant get to them at the mo - will check when I can.

Hi Martin, looks like a LH low lift racing prop ( the SX being the type of blade ie has no overlap, has straight back, cupped leading edge. Usually have a number like X50 which denotes the blade pitch but if this is a cheap one it may not (might have the blade diam on the rear hub face unless it's worn off). Normally it might be say X50 x 35 ie low lift 50mm pitch x 35 D. Different manufacturers have various descriptions but have a look at an Octura site and it might give you an Idea. https://www.gravesrc.com/boats/boat-hardware-by-manufacturer/octura-boat-hardware-and-accessories.html
The hand left or right is mainly to do with nitro boats as the motors only rotate one way (anti clockwise looking from the front of the motor) most electrics can of course go either way and your selection is just to suit your particular application (twins etc). This prop is a normal prop for nitro boats but the "right hand' prop (or reverse rotation) is actually for any motor which can run clockwise (from the motor front) - or very rarely, a nitro motor with a rear PTO, such as nitro outboards ie K&B (rear crank PTO). or one with adjustable timing/direction.
Model aircraft props have always been either L or R hand for either 'tractor or 'pusher applications.

Standards are wonderful things. That's why we have so many of them...all different...

Hi DG,
Thank you.
It goes to prove that you are never to old to learn.
I thought that there was a worldwide standard.

Looking at the video it reminds me that I had some friends that worked with a cavitation tunnel, and they would never talk about there work there.
Obviously we all were doing MOD work at the time.
However it is interesting to see the different results that different propellers have.
Thank again.

Martin.

An opportunity for an essay!

Props work like a screw. It should be fairly easy to see how the prop 'screws' through the water - this video may help:



Far harder is working out what 'left hand' and 'right hand' may mean for model boat props. This is because the US and Europe (essentially Germany) have (or had) opposite standards, and so 'left' for the US means 'right' for Europe! The UK generally goes with the US - but you need to be aware of the issue. It is because the same prop rotates clockwise or anticlockwise depending on whether you look at a boat from the bow or the stern, and different companies adopted different ways of viewing their props....

From PropShop: "..Where previously we only made these in left-hand rotation, all new steam props come in both left and right-hand. Please note that propeller rotation is based on the British and American standard (viewing the boat from the stern) which is the opposite to that in Germany..."

There is quite a lot of discussion of this annoying feature on the boards - see here, for instance:

https://www.rcgroups.com/forums/showthread.php?1993791-Prop-Rotation-North-America-vs-Europe

Most of the explanations of how to determine left or right hand props seem to me to be ambiguous and liable to mislead. It would be much better to talk about clockwise or anti-clockwise rotation viewed from the bow or stern, but left and right seem to be accepted describers. The best description I know is this, and even it can be improved a bit:

https://www.harbormodels.com/proprotation.html

Let us try to improve it (with apologies to Harbour Models):

1 - place the prop on a flat surface with the driven end lowest. The driven end will either have a screw hole or dog groove in it. The un-driven end may taper to a point, or simply be flat.

2 - rotate the prop so that one blade is in the 12 o'clock position. It does not matter which blade this is.

3 - look at the 12 o'clock blade only. The blade will have 2 edges, a left and a right edge. Which of these edges is lower - nearer to the supporting flat surface?

4 - if the left edge is lower, the prop needs to rotate anti-clockwise to go forwards when viewing it from on the supporting surface from above. If the right edge is lower, the blade needs to rotate clockwise for forwards motion.

5 - For US and UK companies, the anti-clockwise prop above is 'Left', and the other one 'Right'. This seems to be becoming a world standard, but several companies may still use the opposite notation, and of course older props will be marked with whatever standard applied when they were made.


To avoid confusion, describe prop rotation by including direction of travel, rotation and direction of view in your statement. Thus 'This prop drives forwards when it rotates clockwise viewed from the stern'. Avoid talking about left or right hand.

Which is the leading edge?😮
Attached info from Raboesch, one of the best brass prop makers I know.
Serve my warships, fish cutter and Sea Scout very well 😊
Cheers, Doug 😎
PS Matches what I saw on various GA drawings during my work on ship comms systems😉

Thank you for the information Guys.
I had an idea how the prop had to be fitted but was unsure, and I knew that I would get the answer if I asked the question here on this sites.

Thanks again Guys.

Martin.

You're right Martin👍
Definitely a Southpaw!
Should turn anticlockwise when going forward.
Always look at the curved edge, that's the leading edge when going ahead.
The slot means it's a so called 'Dog drive' prop.
Meaning that the prop shaft should have a corresponding pin to locate in the slot to transfer the drive. The threaded shaft end goes right through the prop hub to be secured with locked nuts (😮😭)
Cheers, Doug 😎

Hi Martin,
very odd looking prop- would say flat edged portion of blade to the front - but then the curvature of the blade would seem to be in the wrong direction - usually shaped like a scoop - concave not convex - its almost as if its been made in mirror image.
Perhaps SX is S for surface piercing and X the pitch .Heard of X before but not SX.