From IBO webpage:

III. EQUIPMENT

A. GRAINS PER POUND AND ARROW SPEED

1.Arrows must weigh at least five grains per pound of the bow’s maximum
shooting weight unless the archer’s equipment qualifies for the exception set[/align] out in paragraph 2 below. Shooting weight is defined as the bow’s maximum[/align] draw or thrust weight, whichever is greater. A variance of 2 pounds of draw [/align] weight shall be allowed for bow scale variation. Equipment qualifying in this [/align] paragraph (A)(1) shall have no limit on arrow speed.[/align][/align] 2.In the case where an archer’s equipment, when shot at five grains per pound, [/align] does not generate 280 fps, that archer may shoot arrows weighing less than [/align] 5 grains per pound. However, equipment qualifying under this paragraph (A)(2)[/align] shall not exceed an arrow speed of 280 fps. A variance of 3% will be allowed for[/align]chronograph variation.[/align]
If you bow is below 280 fps you can go below 5 gpi!!! As for myself. I never stated that you should go below and I'm not below. They never once state that the arrow is too light to shoot a target. Even yourself said the weight was established for safety. It has nothing to do with the ability of the arrow to penetrate anything. Even a target.

I'm not 10 years old. I've been shooting since I was 7-8 yr old and was born in 71 due the math. Futhermore, you do not know me and do haven't the slightest clue what I do ro do not know. So far from what I've heard from you you basically invented archery and know more about it than anbody on the planet. You remind me of a guy I went to college with. He thought he knew everyhing too and usually he was wrong.

I never said I disrespect anyone. I simply stated that a good experiment is done with a wide range of data. My comment about a light bow was from seeing such low numbers for kinetic energy for an arrow heavier than mine. Yes, modern recureves are better than they used to be. However,I'd liek to see it done with the type of equipment I use. I thinklongbows are cool and wish I'd spend more time shooting one. However, my time only permits me to shoot 1weapon at a time and I want to spend that time being the best shot with the equipment I plan on hunting with.

And as I keep stating. There is more to what makes up a good arrow than 1 value. A smaller surface area on an arrow allows for deeper penetration. I'd just like to see an experiment done with more samples. That's all. It's rare I will ever take the results from 1 person's experiment as the gospil and as I've stated I see the need for a heavier arrow for a lower poundage bow. And, even Arthur Hill admits that he is treating the arrow like it flies in a straight line.

Another note. I've never directly insulted anyone in this thread. However, I can go back thru many replies to a post I made and see some sort of derogatory comment or even pathetic name calling.

A guy says he doesn't want to be told what to think and then says he's the only person that's right and we should all listen to him.

nodog,

So far you've entered the best replythat is worth listening to. I'm not taking anything anyone says personal. Especially when they have to stoop to a sarcastic reply.