Oil & Lubrication

August 19, 2017 Nigel 0

Liquid that reduces friction or wear, or both, between the moving parts within an engine; removes heat, particularly from the underside of pistons; and serves as a combustion gas sealant for the piston rings. Thicker [more…]

Spark Plug

August 13, 2017 Nigel 0

A model engine spark plug can vary in size, but 1/4” x 32 is common as it fits the same thread and rough dimensions of a model engine glow plug. I took this photo to give [more…]

British Association Threads

August 5, 2017 Nigel 0

A British system of threads with 47.5° included angle with rounded roots and crest. Even numbers are the preferred sizes. Favoured by model engineers, Stuart Turner models are traditionally supplied with odd numbered BA nuts [more…]

Metric Threads

July 30, 2017 Nigel 0

The most commonly used type of general-purpose screw thread, one of the first international standards agreed when the International Organization for Standardization was set up in 1947. Metric threads are becoming more common in model [more…]

Gear Noise

July 15, 2017 Nigel 0

Gear whine – Generated by meshing gears due to the vibration caused by failure of the rolling action between the mating teeth due to: Minute imperfections in manufacture of Tooth pitch circle (radius and centre) [more…]

Gear Design

July 2, 2017 Nigel 0

Fundamentally we there are a few different gears: Bevel Gear – Conical shaped gears, the angle between the input and output shaft is anything except 0 or 180°. Double Helical Gear – The double helical [more…]

Centre Drill Profile

June 30, 2017 Nigel 0

I use centre drills all of the time, usually as a pilot drill in the lathe to give me a good starter for a larger drill. However, whey are they the profile they are? A [more…]

Steam Indicator Diagram

June 23, 2017 Nigel 0

The pressure in the cylinder is plotted versus the cylinder volume. This was developed by James Watt and John Southern to improve the efficiency of the steam engine. The work done is the area within [more…]

Gas Turbine

May 20, 2017 Nigel 1

Although practical model jet engines have been around since the early 1980’s it has only been in the past few years that home construction has become viable. Careful design has made simple home construction possible [more…]

Pistons and Liners

April 17, 2017 Nigel 0

There are a number of different combinations of materials for the piston and liner of engines. I’ve listed a number below and comment on their merits, if I’ve missed one then do drop me a [more…]