9 January 2023
by wpAdmin
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Today I managed to put in a grand total of one more of the foundation posts for the polytunnel. One is better than none though and it does put me over half-way through the process. For the first four, I just had to keep them in a straight line with regular spaces between them. I also had the top of the existing beds to use as a height gauge. In effect, I mainly just had to worry about the length dimension, although there was a certain amount of care needed to ensure the posts were vertical and at the right points along the line.
This afternoon’s one required me to also deal with width and depth. I think I got a pretty good result, although number six (out of eight) might be trickier still, as it has all the challenges of today’s one and needs to be in a straight line with it.
One of the things which helps is that, although the parts are specified in metric, the basic design is still built around imperial dimensions. The polytunnel will be 6′ wide and 12′ long with 4′ between each of the side posts. That means the Pythagorean method for calculating a square is very straightforward. If I work on a triangle 6′ wide and 8′ long, that means the hypotenuse will be the square root of the sum of the squares on those two sides. It doesn’t take much to do the maths in your head – 36 + 64 = 100 and the square root of 100 is a nice round 10. I think I’d be breaking out the calculator if I was working on 1.83m and 2.44m (the result should end up at about 3.05m).
A natively metric design could be made to work with neater numbers but all the lengths would have to be redesigned. It wouldn’t be enough to design in feet but label with metres and there is a benefit to sums you can do in your head.