May 22, 2013, 12:22 PM
Post #1 of 16
(2282 views)
Shortcut

Packing volume tolerances + / -

Can't Post

Hi,

I'm turning to the community as I haven't yet got a response from my container manufacturer (pre-empting the smart arse stock reply). Hopefully they are busy building my gorgeous rig rather than answering stupid e-mails

I've read many times that as a rough rule of thumb you can generally go up or down a size of canopy (assuming its a like for like type of canopy).

My container is sized for a specific canopy which I have already but I may buy another as I just fancy a new one and I've been offered a good deal which makes it more worthwhile.

The new canopy I'm looking at, depending on which packing volume figures you believe, may be larger in volume anything from 4-29 cu in. Is this a possible issue or no problemo? I don't really have an understanding of how much 29 cu in is in my head.

Twenty nine cubic inches is about the difference between a Sabre 190 and a Sabre 210, one size in other words. You can tell us what canopy and container combo you are looking at, and see if anyone else is using it, and with how much ease.

I don't really have an understanding of how much 29 cu in is in my head.

The cube root of 29 is about 3.07, or in other words a cube that is 3" on each side. That's not much volume. It's about the size of two doughnuts stacked one on top of the other.

A radius of about 1.9 inches sir. Anyway, a better solution to the problem is the imagine a cube with edges of length L and volume V. In this case that makes a cube with sides of about 3 inches.

Just after I posted that info I got to thinking and came up with a better idea.

1. Since I do not know, I will make an assumption that his main pack tray is 12 inches wide ( east to west ). 2. Since I also do not know, I will make an assumption that his main pack try is 6 inches long ( north to south ).

Take 12 x 6 = 72

ETA to change this: Now take this 72 cu inches and divide by his 29 cu inches and you get 0.4 inches thick. So a canopy of 30 cu inches greater in volume ( for many rigs ) would be about 3/8 inches thick.

Something to do on a rainy afternoon, ETA: If I was paying attention.

JerryBaumchen

(This post was edited by JerryBaumchen on May 22, 2013, 5:12 PM)

I've read many times that as a rough rule of thumb you can generally go up or down a size of canopy (assuming its a like for like type of canopy).

I think thats an old rule of thumb. I think todays manufactures make the rig for the canopies you tell them your going to put in it. Thats been my experience with Sun Path and UPT.

Just after I posted that info I got to thinking and came up with a better idea.

1. Since I do not know, I will make an assumption that his main pack tray is 12 inches wide ( east to west ). 2. Since I also do not know, I will make an assumption that his main pack try is 6 inches long ( north to south ).

Take 12 x 6 = 72

Now divide by his 29 cu inches and you get 2.48 inches thick. So a canopy of 30 cu inches greater in volume ( for many rigs ) would be about 2 1/2 inches thick.

I think you divided at the end when you should have multiplied.

A pack tray that is 12 x 6 is 72 sq. inches. So a one-inch thick layer of fabric on top of that would be 72 cubic inches. But the 29 cubic inches in question is only 40% of 72 cubic inches. So the layer of space that 29 cubic inches would occupy is only 40% of that one inch layer, or .4 inches thick. And .4 inches is a layer only about three-eighths of an inch thick.

I don't think there's many of us whose pack trays are so tight that we couldn't stuff another 3/8" layer of fabric in there.

(This post was edited by BeteNoire on May 22, 2013, 7:21 PM)

Just after I posted that info I got to thinking and came up with a better idea.

1. Since I do not know, I will make an assumption that his main pack tray is 12 inches wide ( east to west ). 2. Since I also do not know, I will make an assumption that his main pack try is 6 inches long ( north to south ).

Take 12 x 6 = 72

I think you divided at the end when you should have multiplied.

A pack tray that is 12 x 6 is 72 sq. inches. So a one-inch thick layer of fabric on top of that would be 72 cubic inches. But the 29 cubic inches in question is only 40% of 72 cubic inches. So the layer of space that 29 cubic inches would occupy is only 40% of that one inch layer, or .4 inches thick. And .4 inches is a layer only about three-eighths of an inch thick.

I don't think there's many of us whose pack trays are so tight that we couldn't stuff another 3/8" layer of fabric in there.

I think you divided at the end when you should have multiplied.

A pack tray that is 12 x 6 is 72 sq. inches. So a one-inch thick layer of fabric on top of that would be 72 cubic inches. But the 29 cubic inches in question is only 40% of 72 cubic inches. So the layer of space that 29 cubic inches would occupy is only 40% of that one inch layer, or .4 inches thick. And .4 inches is a layer only about three-eighths of an inch thick.

I don't think there's many of us whose pack trays are so tight that we couldn't stuff another 3/8" layer of fabric in there.

You betcha!

(This post was edited by Festus on May 23, 2013, 1:23 PM)