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Bassett Lowke "Eclipse"

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JasonB31/08/2021 16:37:34
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I mentioned in the recent thread about the Gamages engine that I had also found an old advert for a similar engine from Bassett Lowke called the "Eclipse" well I could not resistembarrassed

A couple of evenings with Alibre and a design for a reproduction was modelled. I've taken it up to 12mm x 12mm rather than 7/16" x 7/16" and added a couple of small extra details which may change as the build progresses. Those who followed the converting from fractions thread may be interested that not once did I touch a calculator, rule (slide or otherwise) or even have to take my shoes and socks off to get a design that the modern engineer may find usable.

Nigel Graham 231/08/2021 17:30:57
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Good to see these old designs given a new lease of life.

It's a simple, attractive design and one open to all sorts, such as making a twin-cylinder version.

How did you convert the numbers? Simply by remembering as I do several nearest equivalents (e.g. 5/16" ~ 8mm) then basic mental arithmetic for the in-betweens? (5/32 ~ 4mm, etc.) A lot of the BAs have close though not exact M equivalents too. (5BA ~ M3).

JasonB31/08/2021 18:30:30
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I only had the old advert and a couple of photos from the web to go buy so little to actually convert. It was more a case of what looked in proportion and what may have been used originally

I did get a little bit done over the weekend Those are 10-20-40 blocks for an idea of size not 1-2-3! I've reduced the flywheel diameter by 2.5mm from the 3D images as I felt it looked a bit big

JasonB05/09/2021 13:55:11
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A couple of hours in the workshop yesterday morning and I managed to wangle a cylinder out of this bit of cast iron bar

A similar length session this morning managed to convert an off cut of CI and a bit cut from an unwanted casting into the valve chest and cover

Starting to look a bit more like an engine now. I did make use of the CNC to cut the elliptical bottom cylinder cover and also the fancy recess in the flywheel.

JasonB01/10/2021 16:30:57
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I don't seem to have had that much workshop time over the last few weeks but did find some time this week to get the last few bits for the Eclipse completed and could not resist trying it with a bit of air.

For a high speed design it has quite good slow speed running too as you will see if you watch to the end and the video does not show how fast it's actually going at times but once painted I'll do a better video and get the tacho out to see what it can do. Following a recent thread I also included a shot of the compressor regulator showing how low it's set and the except when adjusting this regulator all other engine speed is controlled by the small flow valve. I'm also liking the new Hyundaismiley

BOB BLACKSHAW01/10/2021 16:46:03
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Ive got one of these engines in a steam boat, I took measurements from it when I stripped it down to have a go at making one.

Bobpa300355.jpg

JasonB02/10/2021 13:35:55
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Thanks for the extra photo Bob, there do seem to be more of these about than the Gamages engine and I was able to find quite a few photos to base my version on though I expect mine is destined for a display cabinet not a boat so I won't be making the Steam Linia plant to go with it.

Well I've had the Tacho out this morning so would anyone like to take a punt at the speed while I'm waiting for the paint to harden? I did wind the compressors regulator up to 1bar (14psi)

Steviegtr02/10/2021 14:49:48
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yes Great work Jason. Guess 3500 RPM

Steve.

JasonB03/10/2021 17:08:52
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Well Stevie you may be surprized to know that your's is the winning guess being the closest to what I measuredwink Off Camera I managed 2300rpm and a little less while the video was running.

So here are a few shots of the finished engine

Quite pleased with how it turned out and an enjoyable little one to make and would certainly suit those with smaller machines. It would be possible to do it without silver soldering the base for those that don't feel upto it by using a bit of JBWeld together with the screws to keep things held together.

A few video clips now, there is a bit of vibration as the speed starts to increase but it works through that and smooths off at the top end, I could not see any signs of balancing in the photos I based it on so did not include any but the flywheel could be played with id desired.

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