Seen at HISWA...... New concept inverted blade propellor

[david_bagshaw]

Been to Hiswa today and seen this


Has the advantage a rope wont foul the prop

http://www.destilleboot.nl/

 

[Thistle]

Has the advantage a rope wont foul the prop

... but when something starts to go through, whatever it attached to it will want to go through as well. Probably OK for the odd plastic bag or pot buoy. But what about a bit of rope attached to a lump of net or a pot buoy that someone else has already cut off with a few metres of rope?

And what about noise with the extra gears? And friction between the prop and the housing?

An interesting idea but I don't think it is in the "better mousetrap" category.

 

[DogWatch]

... but when negative negative negative, new bad old good, negative, negative, showing my superiority, negative, blah blah.

Or you could easily fit a grill. It will also be easier to have variable pitch and a steerable leg(s). It also looks though I can't tell from the image so well, that this prop? will be as efficient backwards as forwards. I'd have two tomorrow if they were able to retrofit.

 

[oldsaltoz]

Primarily used on small still water craft and based on a battery powered electric motor according to the web site.

Good luck and fair winds. :0

 

[Ian_Edwards]

This concept isn't new, it was originally developed for ROV's working in the offshore Oil and Gas Industry, by Amertek in the late 1980's, if I remember correctly. The original concept was a ring of rare earth magnets, with the prop set inside, mounted on a ring bearing system. With the stator of the electric motor being housed in the Kort nozzel. The basic problems with the system are the high linear speed at which the ring bearing has to operate and the difficulty of keeping water out of the bearing and grit out of the gap between the rotor and the stator.
However ropes do pass right thro' the thruster, I've seem them tank tested.

 

[jamie N]

This concept isn't new, it was originally developed for ROV's working in the offshore Oil and Gas Industry, by Amertek in the late 1980's, if I remember correctly. The original concept was a ring of rare earth magnets, with the prop set inside, mounted on a ring bearing system. With the stator of the electric motor being housed in the Kort nozzel. The basic problems with the system are the high linear speed at which the ring bearing has to operate and the difficulty of keeping water out of the bearing and grit out of the gap between the rotor and the stator.
However ropes do pass right thro' the thruster, I've seem them tank tested.

It was Schillings IIRC. Big problems with the bearing seals between the nozzle and blades; the ROV had to have a 'fresh water' reservoir onboard for this! Without being sniffy, no decent ROV pilot has ever snagged a rope.....; er, more than a few hundred times anyway

 

[LadyInBed]

Made by Dyson!

 

[Ian_Edwards]

jamie N, you're more than likely correct, I knew it wasn't Innerspace or Slingsby .... but it's so long ago I could remember!

 

[Boo2]

Been to Hiswa today and seen this

Interesting. Obviously ideal for a bow thruster but what's the efficiency like cf a normal prop ?

Boo2

 

[sailorman]

your a Fan then

Made by Dyson!

 

[jamie N]

jamie N, you're more than likely correct, I knew it wasn't Innerspace or Slingsby .... but it's so long ago I could remember!

Ian, never accuse me of having a memory!!! I'm an 'auld' RCV225 man.