downforthecount

I have a Hoyt Havoctec 2002 model with versa cam it states 25.5 to 28.5 inch draw lengths. I have it set on 27" , and i have it peaked at 70 pounds. I have a peep sight, string loop, and 2 cat whiskers(spread the very end of the string). I was wondering what speeds i could expect useing a 350 grain arrow, and 400 grain arrow? Also which would give me better kinetic energy?

Thanks

Big Country

downforthecount, without running your setup thru one of the programs available, I am guessing your speed to be around 260-265fps with the 350 gr. arrow.

Assuming that the spine on the two arrows you mentioned was right for your setup, the 400gr. arrow SHOULD produce slightly more KE, but it would be negligible.

Bigpapascout

You are shooting from 265 to 270 FPS
and your Ke with a 400 gr arrow at 265 FPS is 62 FT LBS KE
350 gr is 54 FT LB KE at 265 FPS.
the only positive accurate way to determine your speed is to launch an arrow through a cronograph.

PABowhntr

I am going to guess that it will be slower than either of the two estimates above.

First off the Versacam operated most efficiently at the upper setting of its draw length range so you are probably going to loose a few fps for having it set in the middle.

Second, your draw length is 3 inches shorter than IBO specs so there is a 30 fps speed reduction there.

Since the IBO for the havoctec Versa was 300 fps that currently leaves you at 267 fps with the 350 grain arrow and 257 fps with the 400 grain arrow..approximately ofcourse.

Now, since you have all those items on the string you are probably looking at an additional speed reduction of at least another 10 fps from what I listed above if not more which would leave you with something around 245 fps for the 400 grain arrow and 255 fps for the 350 grain arrow.

Your KE numbers should be higher for the 400 grain arrow but it is normally within 1-2 ft. lbs of the lighter arrow' s number.

downforthecount

Hello, Thanks for the posts, I shot it through chrono today I just bought one. It shot 266! That is definetly faster than i thought. It is peaking at 71 pounds, and my draw is actually 27 1/2.Thats what my proshop says anyway.

Thanks

PABowhntr

I would assume that was with the 350 grain arrow? If so then it would be right on the money with the extra half inch of draw length and the extra pound or so of draw weight.

Definitely a respectable speed given your setup.

chip387

downforthecount, i too have a 2002 havotec with the versa cam. 70lbs, 30" inch draw. i shoot a heavy carbon arrow(cx term. hunter) at 545gn. i still get 251fps with just a peep and a nock on the string. very quiet this way if your goin to hunt with it. when i was shooting 420gn arrows i needed wiskers and leeches to make it as quiet as it is now and still shot the same speed. its a great bow,,enjoy

Bigpapascout

so my calculations were pretty close