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Author Topic: Graham industries TVR1A  (Read 16517 times)

kno3

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Re: Graham industries TVR1A
« Reply #25 on: October 09, 2008, 11:34:32 am »

...
The connections for steam and exhaust at the engine are correct, and cannot be reversed. This is dictated by the valve gear.
The TVR1 is a slide valve engine and the steam and exhaust must allways remain on the correct sides of the slide valve.
Engine Reversing is a mechanical function of the valve gear not the steam/exhaust direction.

...

I might be wrong, but I believe on the TVR1A one could simply disassemble the cylinders and mount them upside-down, thereby moving the exhaust holes to the other side of the engine if desired. Same for the steam chests.
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GreeboTheCat

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Re: Graham industries TVR1A
« Reply #26 on: October 09, 2008, 04:27:23 pm »

Just seen this thread and as I got towards the end I thought "Bl***y hell, somebody has stolen my Alexander Steam Launch  >>:-(  but then a bit farther the poster admitted he'd borrowed it from the web, phew! As some smart-eyed person noticed, the ACS steam throttle WAS upside down and it was after seeing this picture that Andy pointed that out to me. This has all been sorted out now and the whole thing runs as sweet as a nut. I am of the opinion that the Graham engines are incredibly good value for money and can be built up into superb little engine.

Greebo
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AlexC

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Re: Graham industries TVR1A
« Reply #27 on: October 09, 2008, 04:37:01 pm »

Kno3

Whilst it is possible to do what you say, there is absolutely no need.

The TVR1A is symetrical (in that it has the same length crankshaft extension at both ends, and the fywheel, if fitted, can be fitted at either end) so all that will be required is to turn the whole engine through 180 degs. and then fit the Steam and Exhaust manifolds the opposite way round.
(i.e. flip them 180degs)
This could also permit the valve operating levers to be adjacent to each other, rather than on opposite sides.

That said, this was not what I was refering to in my previous statement..... what I was trying to get accross was the fact that you cannot just change the pipe connections over (as you could do with an oscillating engine)..... since this would put the incoming steam on the underside of the slide valve....which would cause it to lift off of the valve port face.

Hope that is now clear. :-)) :-))

Best regards.

AlexC
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kno3

  • Guest
Re: Graham industries TVR1A
« Reply #28 on: October 09, 2008, 05:45:29 pm »

That's correct Alex, admission and evacuation ports cannot be switched on a slide valve engine.
as you observed, the Graham, being symmetrical, is pretty flexible regarding the placement of the ports. i believe you can even build two engines as a mirror pair, which is really nice for a twin engine boat.
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mogogear

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Re: Graham industries TVR1A
« Reply #29 on: October 09, 2008, 07:44:24 pm »

Just seen this thread and as I got towards the end I thought "Bl***y hell, somebody has stolen my Alexander Steam Launch  >>:-(  but then a bit farther the poster admitted he'd borrowed it from the web, phew! As some smart-eyed person noticed, the ACS steam throttle WAS upside down and it was after seeing this picture that Andy pointed that out to me. This has all been sorted out now and the whole thing runs as sweet as a nut. I am of the opinion that the Graham engines are incredibly good value for money and can be built up into superb little engine.

Greebo

Didn't mean to scare you / upset you mate...I picture is worth a thousand words and when I saw your set up ( which is what I am heading towards) It was a great way to illustrate the question!!
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GreeboTheCat

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Re: Graham industries TVR1A
« Reply #30 on: October 10, 2008, 10:21:58 am »

No worries, I'm honoured and pleased to be quoted in that way  :-))  especially as this was my first ever attempt at steam power!  I did get an awful lot of help from the steam guys on Paddleducks.

Greebo
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