Hoppus Foot Formula

V 0199 x diameter in inches2 0642 x diameter in inches.

Hoppus foot formula. Hoppus foot hft girth inch 42 x length ft 144 wwwpeakoakcouk. This formula is used in the province of quebec canada. Its quite accurate for 14 and 16 foot logs. Bf board feet.

The hoppus foot is named for edward hoppus surveyor to the corporation of the london assurance who described this method of estimation in a book published in 1736. To avoid confusion the cubic metre result from hoppus is referred to as a francon cubic metre. For comparison a cubic metre is the same as 3531 true cubic feet which is almost the same as 424 board feet with board feet bd ft being the standard measure of wood or lumber in the us where a bd ft is 112 of a cubic foot. This is the hoppus foot rule in metric format with results in francon cubic metres fr.

It is plain to the most casual observer that this is a most primitive system and that hoppus whoever he might be succeeded in attaching his name thereto not as its inventor but merely as its tabulator for his popular work is nothing but a ready reckoner. I shall show you two types of formulas to calculate the volume of wooden log in this video. These are i local formula ii the hoppus foot formula. A hoppus foot is roughly 21 percent less than a true cubic foot.

Volumeofwoodenlog hoppusfoot. Following the so called quarter girth formula the square of one quarter of the circumference in inches multiplied by one 144th of the length in feet the notional log is four feet in circumference one inch of which yields the hoppus board foot 1 foot yields the hoppus foot and 50 feet yields a hoppus ton. This volume measurement was developed to estimate what volume of a round log would be usable timber after. Hoppus foot is a measure of volume from log to converted timber accounting for loss.

The hoppus foot is named for edward hoppus who introduced this measurement in his manual of practical calculations printed in 1736. V g 42 l 10000 v volume in francon cubic metres g girth measured mid point of the log in centimetres l length of log in metres. A short video showing how to measure the hoppus foot of a log. V volume in board feet for 4 foot section d dib on small end of 4 foot length.

Bf d 12 l 20. The hoppus board foot when. The hoppus cubic foot or hoppus cube or h cu ft was the standard volume measurement used for timber in the british empire and countries in the british sphere of influence before the introduction of metric unitsit is still used in the hardwood trade of some countries. There is an allowance built in to the h ft for the loss of material during the milling of a butt or log.