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Model Engineering Glossary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Radial Engine
Cylinders arranged radially around the crankshaft. In this case a 1850hp Wright R-2600-29 Cyclone 14-cylinder radial. Note that this is effectively two 7 cylinder radials back to back with the rear bank of cylinders being rotated half the cylinder to cylinder spacing.
See also:Engine Configurations.
Radiation
This is the electromagnetic radiation emitted by a body as a function of its temperature. The idealised body is a black body, this being one which absorbs all radiation that impinges on it. Stefan's law states that the total energy radiated per unit time per unit surface area of a black body is proportional to the fourth power of the temperature (kelvins) of the body.
E=sT4
where s = Stefan's constant = 5.67x10-8Wm-2K-4
See also: Heat, Physical Constants.
Red Gold
25 % Copper 75 % Gold
Red Lead
Chemical name: Plumbate
Chemical formula: 2PbO PbO2
See also: Chemical Table.
Reith's Alloy
74.5 % Copper 9 % Lead 11.6 % Tin 4.9 % Antimony
Resistors
The basic laws relating to resistors.
Rheostan
84 % Copper 4 % Zinc 12 % Manganese
Rings
Turning a ring on a lathe.
Rivet
Used to permanently fix two or more sheets of metal together.
Search for metal rivet books on Amazon.co.uk
Rotary Engine
Rotary engines were used extensively in early aircraft. Note that with a rotary engine the crankshaft is fixed and does not rotate, the propeller is fixed to the crankcase and the whole crankcase rotates with the propeller.
A steam / compressed air / CO2 5 cylinder rotary engine is described in our gallery.
See also:Engine Configurations.
Rotary Table
As the name suggests, this is a table that can be rotated. More specifically this is used with a milling machine to machine a circular part.
Rust
Surface rust on machinery can be a real problem in the small workshop.
There are a number of options such as using a heater that operates below roughly 5°C to stop machinery getting cold and condensation forming on it.
Another option that I have just tried is to use a calcium chloride based trap to reduce humidity and so reduce the chance of condensation by drying the worshop out.