Tacet

Two aspects are being confused here. The five year rule (no sale of a non-RCD boat within five years) and the requirement for ongoing PCAs in respect of previously RCDd vessels.

What was the nature of the maintenance that allowed the bollards to endure this type of abuse?

Me too...

The quote says 8% of CC licence holders are over 65 years. Therefore, presumably 92% are 65 or younger - which is traditionally taken as working age. Probably skewed towards the to younger end by our London friends.

It's a fallacy that marina moorers pay 9% to CRT. Firstly, as a matter of cash flow it is the holder of the network access agreement. More fundamentally, mooring rates are set by supply and demand; they would be the same regardless of the operators' costs. The expense is, ultimately a burden on the original land value. It's basic land economics.

13 pairs of unnecessary inverted commas in one post. Surely a personal best.

Public liability insurance does not relate to claims from customers or clients. I think more work is required on your definition of professional and how one might be confident that cover would continue to be available for delayed claims. But the basic flaw is that you are suggesting that if an insurance company will be able to put a claim on an insurance company, all will be fine. Of course, the two companies will be different on most occasions, but the inherent problem of liability is only shifted rather than eliminated.

That won't work well. Professional Indemnity Insurance is usually on a claims made basis. That means one can only claim against a current policy and not the one when the faulty work was undertaken. You can check that insurance is in place when commissioning the work - but not that there will be cover in a year or two time when a claim might be brought.

Or, for mental arithmetic, the sq rt of twice the length (in feet) gives a result in MPH or knots or thereabouts

I represented a man who was registered blind (severely impaired - which is the highest level) who also scored zero on his assessment. We did eventually get it sorted - but I still get messages asking if he is interested in a career in fork lift driving.

There was a crew of four middle-aged persons and a further friend joined us for up Hatton, which was nice but didn't save anytime that was not subsequently spent in the cafe before he departed. It would have been perfectly possible with just two persons; whether it would be enjoyable is a more subjective question - certainly I would enjoy it. I suppose it depends on your definition of early, but I don't think we went outside 9.00 to 18.00 at all. 162 locks but only 70 miles. 53 hours according to Canalplan on standard settings but these times can generally be bettered.

The Ribble Link is narrow and shallow, by any measure. Maybe you mean the River Ribble or River Douglas?

True enough! That did occur to me - but I won't pretend it came into my earlier posts. Something to do with T^4, I think. A slightly (oh so slightly) reduced heat transfer will occur if the materials are arranged so that the air gap is towards the warmer side of the wall.

OK. We agree if we include the fresh condition that the paint finish remains the same. But that was neither my assumption nor stated to be yours in earlier posts - and I am unsure why it is a relevant condition in a discussion on thermodynamic principles To respond to your final paragraph, stating critical assumptions would help you explain yourself more clearly.

Which bit is wrong? If you have a matt black material on one face of a sheet of anything and a silver surface material on the opposing face, the order in which they face the sun will have a bearing on the solar radiation absorbed and therefore the amount of heat transferred. It's basic thermodynamics. Paint is no more or less than another material in the sandwich.

We can agree on that - my point is that the order of the materials will have an effect, not that this is the only or main factor. In any event, fibreglass (quilt) , cheese and sprayfoam are typically self-coloured and finished. It is rather unlikely all the materials making up a narrowboat superstructure will have similar colours and finishes, so there will be appreciable differences in absorbed radiation depending on the order in which they are arranged.

It does. For the reason you mention - the various materials have different surface colours and finishes.

The point you omitted earlier was that the arrangement of the materials has a significant impact on the roof temperature for a given air temperature.

It is a lot of locks, but Napton to Stratford is perfectly possible in a hire week. We did it last year with a day to spare - as well as spending some time in Stratford.

Above advice is good. The "do not tighten it, so you can't turn the shaft" relates to 2) rather than the tightening of the greaser in 3) The "tighten greaser" in 3) could equally be described as "operate greaser". It does tighten insofar as it becomes more difficult to turn, but that is not the direct aim.

If a safety something is necessary in case the fan breaks, it might be worth considering a stand-by fan rather than a boat!

I wonder why a rescue boat is essential for Harecastle and yet unnecessary for most tunnels?

Maybe but the pedant says check the crankshaft arrangement. There are three cylinder engines with 180 degree crankshafts that avoid the rocking couple. And two cylinder engines with one up and one down pistons, that will be more unbalanced than a 120 degree triple. If you want perfect primary balance with less than four cylinders find a V twin. 90 degree works with a common crankpin. Knife and fork conrods avoids the small rocking couple. Two crankpins can give primary balance at less than 90 degrees. A horizontally opposed twin will give perfect primary and secondary balance but with a narrow rocking couple. Don't really know why, but the BMW motorcycle I have with this arrangement is not especially smooth. I don't much like the bike anyway. Good luck in finding a suitably arranged engine driving a suitable generator

Yes. Oboat is correct and it's Battlebridge, Essex