How to work out m3 of a round log.

[Celtictimber]

Nice explanation

[Celtictimber]

Is there any online calculators to work out hopus foot.

[WeeDee]

Using 3 instead of Pi as an allowance for saw keft and waste doesn't work unfortunately.

 

For instance a 3ft diameter 10ft log has an actual volume of 70 cube (rounded), a hoppus volume of 55 cube and a volume using 3 instead of Pi of 67 cube.

 

Alright, so which one is most suitable?

[openspaceman]

Is there any online calculators to work out hopus foot.

 

It's too simple to need one if L is the length and QG is a 1/4 of the mid girth then

 

=L*QG^2/144

 

dropped in a spreasheet gives Hft

 

Who still uses Hoppus feet?

[difflock]

J.

I was not suggesting the 0.14159 element of PI would compensate for the saw kerf.

Rather that no point in using it if deducting a kerf wastage %age anyway.

To make for simple sums.

ps

(i)Cept ussens went metric in 1972/3.

(ii)So what do the Germans do in respect of Hoppus meters (which would be an unusably large unit)

(iii) Actually with the very rapid progress in laser scanning technology, it should be relatively simple to build a hand held unit to scan the log, thereby measuring it, and calc the usuable timber within.

N.B.

decimal figs for Pi from memory.

well kinda, with the aid of a nemonic.

"Sir, I bear a rhyme excelling, in mystic force and magic spelling"

It has more verses that I did not bother to learn, 11 decimal places generally being sufficient for most calculations.

[Celtictimber]

Is there such a calculation for hoppus cubic meter

[Celtictimber]

Am I right in thinking that if you can multiply the m3 of a round log by 0.7852 and that will give you the hoppus m3

[openspaceman]

Is there such a calculation for hoppus cubic meter

 

I don't understand the question but 1m3 of solid wood is 27.736 Hft IIRC.

[codlasher]

I have always rounded to; 30 hoppus feet is 1.0 cubic meter. Which in beech terms is one ton. I worried when a beech butt measured over ninety cube as I knew we'd have trouble moving it because it weighed in at over three tons.

codlasher

Edited January 23, 2014 by codlasher

[difflock]

I have always rounded to; 30 hoppus feet is 1.0 cubic meter. Which in beech terms is one ton. I worried when a beech butt measured over ninety cube as I knew we'd have trouble moving it because it weighed in at over three tons.

codlasher

***************

discreet couch-cough

Quite a large tree then Codlasher:thumbup: