Propeller Size

Propeller on 5 cylinder rotary engine

The propeller size should be chosen to match the engine and airframe. However, it may take some trial and error before you get the right propeller for your particular installation. However, the following table may be used as a guideline for two-stroke engines with four-stroke engines in the next table. Propeller Sizes for Two-Stroke Engines … Read more

Fizgig Stirling Engine

fizgig stirling engine

Engine build and author: Dick Barnes Having now reached that moment of retirement and with a fully kitted out workshop, this Fizgig stirling engine looked like an ideal subject to commission the new lathe. Fizgig is a Gamma Stirling engine in which the power piston is not mounted coaxially to its displacer piston. The advantage … Read more

Oscillating Engines

double acting oscillating engine

I thought it would be good to talk about oscillating engines. In particular the oscillating engine I made some time ago. A double acting oscillator with a geared flywheel. The valve on the oscillating engine is very simple. So simple that at first it is difficult to understand how enough steam enters the cylinder. However, … Read more

Brake Mean Effective Pressure

Bouland Motors 1/3rd scale cosworth DFV

Brake Mean Effective Pressure is the average effective cylinder pressure that does useful work calculated from the brake horse power. Abbreviated BMEP, this is a fundamental parameter associated with an engine design. The work accomplished during one engine cycle divided by the engine swept volume. It is essentially the engine torque normalized by the engine … Read more

Horizontal K-Type Engine Configuration

k-type engine rapid prototype

Horizontal K-Type engine configuration proposed and analysed by Rushiraj Kadge. This engine boasts the following benefits: Better balanced (percentage difference between unbalance forces as compared to existing configurations is more than 45%). This means more power can be extracted from Horizontal K configuration. The proposed configuration has least frictional losses. CG height of proposed configuration … Read more


cast iron piston and aluminium conrod

The piston is a cylindrical part which reciprocates in the cylinder bore of an engine and transmits the force of the gas pressure through the connecting rod to the crankshaft. This means the piston needs to seal against the cylinder wall with a low friction and a low wear rate. Articulated Piston Two-piece piston incorporating … Read more

1/3rd Scale Cosworth DFV

Bouland Motors 1/3rd scale cosworth DFV

A 1/3rd Scale Cosworth DFV model engine by Bouland Motors It was December 2015 and Marcel Bouland, scale model engine enthusiast and collector decided to develop a fully working 1:3 scale Cosworth DFV engine. Many people were asking if he wanted to sell one of his scale model engines, the answer was no. So it … Read more