Dairy King

Can you figure my IBO speed for me? I dont have the slightest idea how I would go about doing it. I know speed isn't everything, I shoot a 510 grain arrow. Im just curious how it would compare to "todays bows".

26 inch draw
54 pounds
242fps with a 342 grain arrow.

What else do you need to know?

H80Hunter

The way I see it, IBO=350 grain arrow, 70 lb. draw and 30 inch draw.

342 grain arrow=242 fps, so to make it easier, say that a 350 grain arrow =240 fps. Another 16lbs of draw weight should be roughly 30 fps. Also, Im not positive what 4 inches of draw length would be good for, but say 25 fps (?) which would put you close to 300 IBO.

zak123

I have heard that 1" of draw length is 10 fps. I do not know if that is true with Oneidas, but it should be close. Higher letoff reduces speed, but only by a few fps.

Dairy King

Before I posted this, I used 11fps per inch of draw and 2 fps per pound of wieght. I came up with 350fps. I did something wrong. This is why I hate math. [:@]

buckeye

The numbers you provided produces 310fps ibo.

Dairy King

310fps? Holy cow. I always thought this thing was a slug. Wow. I know its all theoretical, but it gives me an idea.

mobow

I am confused. Do you shoot a 342 grain, or a 510 grain arrow? I could very possibly be wrong here, and mean no insult to anyone....but, how is a 26 inch, 54 pound draw bow going to shoot 300+ fps?

IBO rating is 70#, 30", and 5 grains per pound, yes?

buckeye

I took it as he shoots a 510 grain arrow but gave us fps specs for the 342 grain arrow.

It won't. He was asking if his bow were set at IBO specs what it would shoot.

Dairy King

That was the speed it was when shooting a 342 grain arrow. I currently shoot a 510 grain arrow. I wanted to know what the speed would be if I lengthened the draw to 30 inches, and added 16 pounds of draw weight, etc etc. My bow as it is now, will never shoot 300+fps, but if I were to make it into IBO specs, how would this compare to the bows out now. I would look it up, but this isn't a production bow. So, thats out of the picture.

mobow

AHHHH......gotcha......man, I was backwards and upside down again..lol...thanks for the clarification.