Aluminium Longboard Thickness?

RadeonHDx

New member
So, with the assistance of my dad and his workshop, I am going to be taking upon myself the task of making an aluminium pintail longboard. I have seen lots of designs of aluminium longboards but most are extremely thick and I fear that they may be too heavy and have no flex to them. My question is, will I be able to get away with having a sheet of 1/4" aluminium to make my deck but still have it be light enough for easy carrying?

I know this isn't really the place to be asking but I was asking from more of a physics stand point to know weather it would be able to take my weight (around 75kg).

The deck would ideally be from 44" to 50" and have the 2 trucks as far down the nose and tail as possible. much like is shown here but with a sharper point on the tail:
91044pintail50-combined.jpg


The designs I have seen on the internet have mostly been CNC machined to get rid of excess weight but I was hoping that I would be able to do a minimal amount of this because of the complexity of setting up the code on my dads Hurco CNC.



Some designs I've seen that I like the look of and will base my own designs off:

images

DSC00677.jpg
 
1/4 seems a little thin IMO. If it were me I wouldnt go below. 3/8. If you need to keep the weight down on a thicker piece you could machine ribs out so the material is lighter but the ribs add strength almost as though it were the thicker material. Look at underneath a injection moulded garden chair. The ribs greatly increase the strength with minimal weight and use of material. If course there will be a large amount of waste if milling out sections but that is just one of the things to consider
 
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I was worried it might be abit thin :(. Looks like I'm going to have to mill some chunks out of it to get the weight down, I think we have some 5/16" but I know that that's not that much thicker at all. Well I'll just have to see what I think of the weight when I cut it.

Thanks
 
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