Have a look at my Prop!

[thefatlady]

Common material for props is manganese bronze. It is normally resistant to corrosion in seawater but is in fact not a tin bronze but a zinc/copper alloy and technically therefore a brass, but containing manganese as one of the alloying elements. It can therefore suffer from dezincification but normally only as result of some other factor.

I stand corrected. I looked it up and found that some "manganese bronzes" (not prop ones) don't even contain manganese! However all do contain substantial amounts of zinc and are basically brasses.

I have been used to specifying aluminium bronze for high quality marine applications and didn't realise that brass had been renamed to fool the unwary (I can't think of any other reason), presumably because it's cheaper. Sounds like a poor substitute.

Thanks for that. You learn something every day.

 

[pheran]

Solent area? I would recommend CJR Propulsion at Bitterne Manor. Brilliant at repairs or for new props from their own foundry. Nothing seems to be too much trouble for them and prices are reasonable given the quality of the product.

 

[Firefly625]

Solent area? I would recommend CJR Propulsion at Bitterne Manor. Brilliant at repairs or for new props from their own foundry. Nothing seems to be too much trouble for them and prices are reasonable given the quality of the product.

Thank you, another one call.

 

[mjf]

Firefly you say "only left the water for a week a year for the last 5 years so surveyor recommended this year she stay out at least 2 months to dry out"

What dries out that needs to. I come out for a day and normally back in same day as believe boat better supported floating than on a couple of blocks and side supports

 

[Firefly625]

Firefly you say "only left the water for a week a year for the last 5 years so surveyor recommended this year she stay out at least 2 months to dry out"

What dries out that needs to. I come out for a day and normally back in same day as believe boat better supported floating than on a couple of blocks and side supports

Interesting question, everyone knows wooded boats take moisture into their hulls and indeed most are not water tight until they have (so the planks swell up), however GRP also takes on moisture from sitting in the sea (obviously to a mush lesser extent). Hence why on a survey moisture readings are taken. If too much then the boat has most likely got osmosis. Of course I agree that a boat is supported better by water than on a cradle, but its a means to an end. I know someone who's sale has just fallen through on his boat as for the last 14 years it has only been out the water for a few days every year. Don't fall into the false sense of security that as my boat is plastic it can stay in the water forever... IMO a boat needs to come out every year for a month.... I wouldn't be surprised if a number of people disagree.... but it won't change what I do..

 

[omega2]

wet??

from my experience surveyors with their meters try to frighten the life out of you, of course if "read" as it leaves the water it will give a damp reading, if left to "dry" for months then it will wrap around the chocks, try leaving the door open when next lifted. I doubt you will close it easily.

All grp hulls will absorb water eventually, and still be sound.