wow only once? you where born to be a bow maker my friend

Your bowstring looks a bit like cotton, maybe you want to look into growing flax, or getting sinew, or dacron for a bowstring.

Sisal or jute would work, they are both pretty easy to get.

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It's fastflight i don't know what it's made of but it does the job.  As for growing flax, I would like to but i have no idea how to make it into a bow string.  Sinew is not that easy to obtain where I live becaue every thing is ilegal to hunt

Looks good,  can we see a pic at full draw?   

18 strands

I think a dozen strands would work fine. Nice bow you have there. What tools did you use to make it with?

If you have access to saplings, I have some good advice for you. Cut down the sapling, and debark it.

A 1.5" wide sapling is plenty for a 40 pounder. Work down the belly some more, a hatchet and hand plane are good here. Get it bending eight inches with about 40 pounds of resistance at eight inches.

Then string it backward, with a brace height of 2". Wait a week, then shape it just a little more, get it bending 14".

Wait another week.

Then get it fine tillered, nocks cut, get everything nice. You just made a bow that was green for most of the rough  tillering process. Making a bow green like that will really cut down on your work load, on the necessity for tools to be sharp, time even.

And nothing was sacrificed except two weeks of seasoning time.

But one thing to keep in mind, dont brace it or shoot it while it is seasoning. It will take a serious set, and will makea  very poor bow when fully seasoned. Just be patient.