Surface Roughness

end mill finish with SX2.7 and bracket

At a microscopic scale, no surface appears perfectly smooth. Surface roughness is determined by calculating Ra and Rz. Ra = average surface roughness Rz = information for any pore, hole or surface deformities. These can be detrimental to strength. Ra averages all peaks and valleys of the roughness profile and then neutralizes the few outlying … Read more

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

Tom Haney Gallery

Tom Haney - The Bachelors & The Bowery Bums

The Tom Haney gallery, a page to introduce you to a world of kinetic art, model making and art. This is just a flavour of his work, but I hope that this gives you inspiration to explore more. Or even a desire to own one of these fabulous pieces, yes, you can buy or even … Read more