Historic Boats for sale online

[Tony Brooks]

4 minutes ago, MtB said:

 

 

I was thinking they might marginally further restrict the flow of water into the prop, making cavitation slightly worse.

 

 

 

That is certainly a possibility, but if it restricted much I think it would ventilate because that means water would have been drawing down from the surface.

[Derek R.]

Well I'll show my further ignorance by asking; What is an anti-ventilation plate, and how does it differ from an anti-cavitation plate?

Where is it fitted, what does it do?

The correction needs an explanation. (At least for me it would appear).

[BEngo]

Ventilation is when air is drawn down from the surface into the propellor, spoiling  its thrust.

 

Cavitation is when the pressure at the front face of the propellor blades is low enough for tiny steam bubbles to form ( boiling )   in spots.  When the bubbles collapse there is often damage to the propellor, and a lot of underwater noise.

 

Anti ventilation plates  as seen on many converted butties e.g. Renown, stop air drawing down and are a substitute for the motors counter plate.

 

Anti cavitation plates do not exist.  Cavitation is dealt with by extra immersion and careful propulsion system design

 

 

N

Edited April 16, 2024 by BEngo

[Derek R.]

https://www.boatingbasicsonline.com/boat-propeller-cavitation-vs-ventilation/

[magnetman]

The motorised former horse Boat I owned briefly had anti ventilation plates. 

 

The Raven butty had a very similar arrangement but I don't think it had the flanged edges so if you fell in at the wrong time it would cut you in half. 

 

This was the Boat I had:

 

 

 

https://www.nationalhistoricships.org.uk/sites/default/files/data/nrhv/vessels/2087_ORIANNE_5.jpg

 

 

Edited April 16, 2024 by magnetman

[IanM]

41 minutes ago, magnetman said:

The motorised former horse Boat I owned briefly had anti ventilation plates. 

 

The Raven butty had a very similar arrangement but I don't think it had the flanged edges so if you fell in at the wrong time it would cut you in half. 

 

This was the Boat I had:

 

 

 

https://www.nationalhistoricships.org.uk/sites/default/files/data/nrhv/vessels/2087_ORIANNE_5.jpg

 

 

 

Enlarged picture of Raven from the other end to my previous picture showing the plates being discussed.  Actually it looks to be more of a single plate as it wraps around the stern but whatever 

 

[Ray T]

On 16/04/2024 at 08:18, BEngo said:

Ventilation is when air is drawn down from the surface into the propellor, spoiling  its thrust.

 

Cavitation is when the pressure at the front face of the propellor blades is low enough for tiny steam bubbles to form ( boiling )   in spots.  When the bubbles collapse there is often damage to the propellor, and a lot of underwater noise.

 

Anti ventilation plates  as seen on many converted butties e.g. Renown, stop air drawing down and are a substitute for the motors counter plate.

 

Anti cavitation plates do not exist.  Cavitation is dealt with by extra immersion and careful propulsion system design

 

 

N

Photo from here: http://nurser.co.uk/index.html

Edited April 17, 2024 by Ray T

[max's son]

On 07/04/2024 at 17:29, Paul H said:

 

And Vesta has been (finally) sold…

 

Paul

See that Ballinger has also sold

[ditchcrawler]

Up on Facebook 

[Admiral]

Gort for sale

Gort

[David Mack]

21 minutes ago, Admiral said:

Gort for sale

Gort

We accompanied Gort up the Grand Union after the Diamond Jubilee Parade on the Thames in 2012. The owner is a lovely chap, and from spending a few days boating, and a couple of evenings in the pub with him, I would never have guessed he was a Peer of the Realm!

[Ray T]

Gort was Mike H's first boat as captain.

I met the owner and boat a few years ago now at Sutton Stop.

I was privileged to be allowed in the cabin. 

A beautifully maintained boat.

[Stroudwater1]

6 hours ago, Ray T said:

Gort was Mike H's first boat as captain.

I met the owner and boat a few years ago now at Sutton Stop.

I was privileged to be allowed in the cabin. 

A beautifully maintained boat.

We let Gort past us last year round Wolfhampcote, lovely engine noise and a beautiful boat. I hope someone who appreciates and can look after her is tempted. 

Re an anti ventilation plate - does this one count? 

 

 

[mrsmelly]

13 hours ago, Stroudwater1 said:

We let Gort past us last year round Wolfhampcote, lovely engine noise and a beautiful boat. I hope someone who appreciates and can look after her is tempted. 

Re an anti ventilation plate - does this one count? 

 

 

I used to moor next to that boat lol. 

[Admiral]

James Henry bantock for sale on the duck

 

James Henry

[cuthound]

12 hours ago, Admiral said:

James Henry bantock for sale on the duck

 

James Henry

 

Phil and Margaret Dowling's old boat, so would have been well looked after at least until he died a few years ago.

 

They were a lovely couple who used to manage the Black Prince hire base at Northwich. It was one of the better moorings for our shareboat.

 

 

[ditchcrawler]

17 hours ago, Admiral said:

James Henry bantock for sale on the duck

 

James Henry

@haggis have you seen this?

[haggis]

1 hour ago, ditchcrawler said:

@haggis have you seen this?

I knew it was going to be sold as Margaret no longer lives on board. I will miss seeing her when we pass

[Foggy66]

Wooden motor

https://www.facebook.com/groups/canalsandrivers/permalink/7681189938631868/for 

 

[David Mack]

4 hours ago, Foggy66 said:

Wooden motor

https://www.facebook.com/groups/canalsandrivers/permalink/7681189938631868/for 

 

And for those of us that aren't members of the private Facebook group?

[Foggy66]

13 minutes ago, David Mack said:

And for those of us that aren't members of the private Facebook group?

Good question and TBH I’ve absolutely no idea. Are there any 12 years olds on here who can help😬

[stagedamager]

it's the Severner Don, 12k. she's quite hogged and will need a fair bit of work to get her straight again.

[John Brightley]

Just now, stagedamager said:

it's the Severner Don, 12k. she's quite hogged and will need a fair bit of work to get her straight again.

Here's a link to another Facebook post: https://www.facebook.com/groups/389587549882474/permalink/825259346315290/?mibextid=rS40aB7S9Ucbxw6v

[ditchcrawler]

2 hours ago, David Mack said:

And for those of us that aren't members of the private Facebook group?

Most FB groups are private now to stop the spam etc getting through

[Ian Mac]

Just seen an image of NB Don on the bottom.