Seagull Engine Construction Diary

Making a 10cc twin 4-stroke to the E T Westbury design


Hemingway Kits

Perhaps better known for kits for making tooling, Hemingway Kits also provides kits for quite a number of IC engines designed by E T Westbury and others, and is introducing steam engines as well. I have found the proprietor, Kirk Burwell enthusiastic and pleasant to deal with.


I had a job tracking down a small bottle of Loctite 648 high temperature retainer, intended (but not tried yet) for the cylinder liners and valve guides. I eventually found 5ml bottles at Skydrive who delivered very promptly.

Lapping Compound

A lapping compound that breaks down, called Timesaver is available in two hardness grades and 4 grits from
G A Watt Engineering Supplies, 9 Doune Crescent, Bishopbriggs, Glasgow, G64 3JG - 0141 563 6520.
At the time of writing, a 1lb tin of compound is £36-90 plus carriage and VAT.

Put off by the price, I got some fine garnet lapping compound from Brownells. I have not used either yet, but I have used Brasso, and it seems pretty good.


Joint sealant - not tested yet.

Internet Groups and Mailing Lists

The best site I have found is Home Model Engine Machininst. It is a very active forum with lots of people posting descriptions and photos of their work, some of which is stunning, and answering questions with enthusiasm and (often) good advice.

There are a couple of now virtually defunct Yahoo groups: ET Westbury Engines and Strictly Miniature Internal Combuston Engines. People do still watch these groups, so a posting will be responded to. It's just that posting does not happen very often these days.

Email me (see below) with other links I should include.

Links to other Seagulls

Graham Meek built an air-cooled version with an electric fan, and wrote about it in Engineering in Miniature, October 2010 issue, also here. As well as some interesting ideas, there is some nice workmanship on this engine.

Ron Chernich (see below) acquired a part-built Seagull, with which the original builder had evidently run into problems. Ron never did anything much with it, but his wry notes highlight the need for great care with the head bolts and water passages.

There is some footage of a Seagull running at idle on YouTube.

Other web resources

The late Ron Chernich's long established monthly newsletter is a gold mine.

A most valuable little program is Duncan Munro's ML7 Gear Calculator which will produce a set of possible gear trains for any thread pitch. It will store any gears one may have beyond the standard set.


Westbury, Edgar T (1936, 1992), Model Petrol Engines, TEE Publishing, ISBN 0 905100 34 4.

Mason, L C (1976), Model Four Stroke Petrol Engines, Argus Books, ISBN 0 85242 431 0.

Stride, Malcolm (2007), Miniature Internal Combustion Engines, Crowood Press, ISBN 978 1 86126 921 8.

Law, Ivan (1998), Gears and Gear Cutting (Workshop Practice Series), Special Interest Model Books, ISBN 978-0852429112.


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