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Arrow weight

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WillS:
Bit confused/stumped here, hopefully somebody can offer some advice!

I recently finished a sheaf of EWBS Livery arrows, and was just recently able to weigh them on very accurate scales.  They are all made of Poplar, all using the same heads and all with the same size/length fletchings whipped with the same thread.

However three of them are 10 grams at least lighter than the rest.  Is this something that happens often due to wood density and I should have weighed them before constructing?  Is there any way of adding 10 grams to an arrow to make it fall into regulation weight categories?  I'm amazed there can be so much difference from one identical shaft to another!

adb:
Yup, that is very normal. I've had arrows with exact materials and dimensions weigh up to 20 grams different. It's about the density of the wood shaft. What I do to compensate is weigh all my shafts beforehand, and group them into lots. I also weigh my hand forged arrow heads, and separate them into lots. I match the heavier heads with the lighter shafts to try and match final arrow weight.

I think it would be difficult to add weight to the finished arrow, and keep the point of balance appropriate.

WillS:
Thanks Adam, total mistake on my part then! Will have to make a couple more up to compensate!

Would you happen to know off the top of your head what a full length (32") poplar shaft bobtailed should weigh, in order for it to meet EWBS specs once completed?

adb:
I don't know... I can't get poplar shafting. But, if your arrow head weighs about 15-20 grams, then your shaft must weigh 45-50 grams. The weight of the 3 feathers is negligible... less than 1 gram, so I don't even account for it.

The next trick for you to consider is the spine. Good luck with that one... it's been a challenge for me! The arrows I made with very stiff spine did not fly as well as comparable arrows with softer spine.

Thesquirrelslinger:
What I would do- hammer some lead sheeting till its super-de-duper thin... then jam some inside the head socket... and also bore down into the shaft a tad(1"max) and fill the hole with lead wire... and the put the point back on.

thats my style.... i like messing with stuff.
i cannot stand to not build/modify stuff.

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