Mooring

Well, if the weight changed when they submerged they'd have defeated Newton!

Weight, as defined as the product of mass and local gravitational acceleration, won't change for iron wheels or concrete blocks

The apparent weight will be less, as predicted by Archimedes' principle
 
I was forced by the mooring authority to have my swing mooring proffessionally inspected. They insisted on replacing the old iron mass as it was showing signs of rusting . I had no choice and they fitted a railway wheel. I think of 250kgs. They hada water pump to blast the sand so that it was left semi submerged. Railways in the north of here are big business there being about 4 different lines privaely owned carrying iron ore at about 80 tonnes per truck and 100 trucks in a train. So worn railway wheels are plentiful. Although he charged me quite a bit to supply and fit the wheel.
Any it would not be my first choice for a DIY mooring. I would go for iron mongery that is more manageable in weight and use multiple pieces chained together. Just avoid sharp projections if it is a dryinjg mooring. The concrete filled tire seems a good choice and several chained togethershould be OK.
You could also add anchors or home made fishermans look alike made of iron bar to aid the holding of a central mass.
IMHO use what you can find around. good luck olewill
 
You should download Google Search Engine. http://www.watercressline.co.uk/ It might have a spare wheeel as well.:D

I clicked on your link and lost two hours of my life! Fabulous videos and information on Britannia class locos, always my favourite since I watched them every day with my brother, early 1950s. Wonderful, thanks. Might go to their open day in October.
 
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