Hoppus Foot Formula

V volume in board feet for 4 foot section d dib on small end of 4 foot length.

Hoppus foot formula. 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. I shall show you two types of formulas to calculate the volume of wooden log in this video. A short video showing how to measure the hoppus foot of a log. These are i local formula ii the hoppus foot formula.

Bf d 12 l 20. A hoppus foot is roughly 21 percent less than a true cubic foot. This is the hoppus foot rule in metric format with results in francon cubic metres fr. This formula is used in the province of quebec canada.

It is an imperial measure sometimes used in the hardwood trade and not in the softwood market. 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. A hoppus foot includes the rounded edges from which the cubic volume has to come. 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. 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. The hoppus foot is named for edward hoppus who introduced this measurement in his manual of practical calculations printed in 1736. 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.

Hoppus foot is a measure of volume from log to converted timber accounting for loss. Bf board feet. 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. Hoppus foot hft girth inch 42 x length ft 144 wwwpeakoakcouk.

This volume measurement was developed to estimate what volume of a round log would be usable timber after. The author died three years later but his book was wildly successful going through numerous editions in the 18 th and 19 th centuries. The hoppus board foot when. Volumeofwoodenlog hoppusfoot.