Brian of NB Invicta has written a fascinating account of his trip through Standedge Tunnel last week. See The Invicta Standedge Tunnel Report
It's 3,000 words, and in a stilted, formal style at odds with his normal cruising log - it reads more like an engineering report or expert witness testimony.
Which I suppose it is.
But boy, how interesting.
It's over four years since Granny went through Standedge, towed in convoy by the electric canal tug while I travelled in the tug's own cabin. (See Granny Buttons goes through Standedge Tunnel, 2004)
At that time I wondered why Granny needed to be towed, and the tunnel clearly didn't need the insistence on hard hats that we were told to use. But I did as I was told (thankfully I wasn't asked to wear a lifejacket, or I'd have probably walked over the tunnel top).
Brian's boat has a traditional narrowboat engine - in his case, a 2cyl Kelvin. He was asked to remove the traditional chimney, and the engine spurted its exhaust directly up to the tunnel roof - which replied in kind, with plenty of detritus on the cabin roof.
It was precisely because of his configuration - engine room, vintage engine, vertical exhaust - that he was chosen to test the tunnel.
The BW-assigned steerer was told to keep to the pedestrian 1mph speed of the official Standedge tunnel tug, and soon found steering almost impossible at that speed, coupled with his inexperience at handling a vintage-engined boat, so they agreed to speed up a bit.
At which point the BW man handed over to Brian, as it was clear that:
... this combination of skills and familiarity of the tunnel and boat [respectively] by the BW pilot and the author became immediately apparent; and the passage continued without any cause for concern by either party.
(i.e. it was clear that the boat owner knew best!)
The electric tug behind asked them to slow down, so that it could keep up, but if they slowed down, they lost steering.
And they soon had a sterling demonstration of the tunnel cutter:
The lowest point of the tunnel gave no problems and the exhaust pipe that spit the exhaust flow to the sides could have been left on. As it was the vertical exhaust flow was bringing considerable amounts of debris down form the tunnel roof and covering the roof of the boat. At some points it became uncomfortable with dust flying in both the author’s and Fred’s eyes.
I'm pleased to say that I've found no more sterling description of a 'tunnel cutter' than mine own, four years ago - see Define: Tunnel Cutter.
(Billy Bubbles' description of a tunnel cutter runs it close, and is funnier. But I win on points, because I have a photo.)
Near the Marsden end of the tunnel Invicta gets trapped against an underwater obstruction. It's only got a 2' 6" draught, and it's clear that the problem is a combination of an underwater 'ridge' in the channel, the lower water level at the front (due to propellor 'suction') and the low water level overall.
But they get by, thanks to legging and poling.
The other chief conclusion is that Brian feels his standard 'flat beam' headlamp (which is kindly designed not to dazzle oncoming boats in wide tunnels) would be inferior to a conventional main-beam headlamp, since Standedge is a one-way tunnel and thus you can focus (literally) on the way ahead.
In summary, Brian recommends 'self-steer passages', because, inter alia:
It will greatly reduce the pressure of water supply on the on the Diggle and Marsden flights when up to four boats are ascending the flights all at one time.
If a passage of the tunnel can be made on any or a number of designated days in a week and the lock flights left open during the day boaters can arrive at relatively random times.
They can enjoy the villages of Marsden and Diggle more and bring more income to those communities (especially Diggle, where they arrive at 12.00 noon and have to descend the locks at 13.00.)
It would also greatly reduce the financial expenditure of BW compared with the present method of tunnel passages.
Amen to that last one.
But amen to the previous one too. In fact, I'd applaud it if they could build canal basins on that particular summit and encourage many more boaters to tarry longer and explore the area.
There's one small error. Very small. He says Invicta was "the first private boat owner to steer a boat through the tunnel since 1944 when the canal was abandoned", but Rolt and Aickman and their friends took a boat through in 1948.
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