Slightly disappointed Speed Performance
 

Just got a bowtech liberty. 29.5" draw, 67lbs, Muzzyzero effect, peep,kisser, string loop,shooting blackmax-4 arrows, 100gr tip, and only kicking out 240fps. I kinda expected more.

My old cheap PSE Mohave shoots them faster at 245fps with 67lb draw.

It is a pretty dense arrow with 10.4gr/inch, but still thought it would have outshot my old cheaper PSE speed wise.

Also shot some Beman hawks 400 (real light) and got 255fps. I get 262fps from my PSE.

RE: Slightly disappointed Speed Performance
 

That doesn't sound right ??? Has the chronograph been calibrated ? My Allegiance shoots 296 fps...

RE: Slightly disappointed Speed Performance
 

Actually that sound about right for a bow that IBO's at 295-303. The Black Max arrow is very heavy and you have a lot of crap on the string. The Beman hawks aren't that light as a 29" arrow fully constructed are still a little over 420 grains. You are putting out some hardcore KE though so you can't complain about that.

RE: Slightly disappointed Speed Performance
 

You right. Shouldn't be complaining. Its just been so long since I bought a new bow. And kinda figured I would be kicking my cheap PSE in the butt when it came to shear speed. But, But, its a night and day difference in shooting the two bows. My PSE is setup pretty well, but after shooting these straightlimb bows, it was hard going back to my PSE. I have to admit, 80% letoff, solid backstop, and no, I mean no shock definatly has advantages.

Allegience are setup a tad different however. I can see how yours is flying so fast.

I bare shaft tuned it today and am hitting right on with that. Next step got to broadhead tune. Should be interesting. Well frustating at least.

RE: Slightly disappointed Speed Performance
 

Yea the liberty is a sweet shooter but never was a speed demon. I cant wiat to get my hands on a tribute.

RE: Slightly disappointed Speed Performance
 

bigcountry,
I have the same bow maxed out at 61lbs 30" draw shooting a 28-1/2" 384gr goldtip 5575 @ 266fps. The only thing i have on the string areleeches and a d-loop. I've killed two deer with it so far this year and absolutely love this bow and it's without a doubt a pure shooting machine:D. It's the smoothest, quietest, shockfreeand most enjoyable bow i have ever shot or owned. It's also as accurate as i can be with it.
The Libertyisn'tadvertised as a speed bow and it surely isn't one by any means but yours should do a little better than what you're getting.How heavy is your arrow and how long? You could go lighter and gain some speed andeither losethe peep or the kisser and get a little more. Also you may want to check the chrony or shoot it through a different one. If you make no changes at all then 240fps isn't bad and is plenty fast for hunting and i'll lose speed anyday for such a sweet shooting machine as the Liberty. God Bless! Mike

RE: Slightly disappointed Speed Performance
 

Mykey, I was shooting hawks which I consider light and had a 390gr arrow. I was told that was too light. so I moved up to a 10.6gr/inch arrow. So yea, its a little slower because of that. I bet my arrow is now 440gr.

RE: Slightly disappointed Speed Performance
 

bigcountry,I put a zero effect on my bow as well, with a 28.5 '' draw I use shafts at 27'' and it straitened out my arrow flight quit a bit.with the overdraw allready there just wondering if this is something you 'd concidered?

RE: Slightly disappointed Speed Performance
 

Well, it depends on how my broadhead tuning goes. But I am already on the stiff spine side, so shortening would make it stiffer. Well see.

RE: Slightly disappointed Speed Performance
 

Bigcountry
Your IBO speed is 295 with 30"draw and 350grain arrow.IF your arrow is 29"s long your arrow weight is around 457grains. Thans 157grains above IBO, that alone would put your speed down to 220fps, not to mention all the stuff you have on ur string. So at 240fps your getting 58lbs of KE.If you went with say a Maxima 350 arrow at 29' length , your looking at about 387grain arrow weight, you can expect speeds around 270-278 and 65lbs of KE. So who ever told you that you needed an arrow that was that heavy doesnt understand that when you increase arrow weight, you dont neccesarily gain KE, because you loose so much speed. You just have to find a happy medium. Hope this helps..

RE: Slightly disappointed Speed Performance
 

I am just going by Easton's tuning guide min. weight arrow guide.

RE: Slightly disappointed Speed Performance
 

what?? you need to go back to basic physics.. Just for the record take any bow any draw length. shoot a 300 grain arrow you will get such and such a speed and so many ftlbs of KE. now take same bow, same draw length, just change arrow weight and shoot, you will get slower speed but KE will always,I repeat always, be more. and the heavier the arrow gets the more KE you will get, even though it is going slower. You will need a Chronographs to measure the speed at the bow and and grain Scales to measure the weight of the arrow.

At least it's always been that way and I don't see why physics would change just because you bought a bow and arrow.

RE: Slightly disappointed Speed Performance
 

Well, it must be fast enough. Just got me a 4pt this morning. I debated on whether to shoot, but I lose this property after this year, and said why not, I need the meat.

RE: Slightly disappointed Speed Performance
 

You're right ! I didn't read the part about being a Bowtech Liberty.. Thanks for the catch...

RE: Slightly disappointed Speed Performance
 

QUOTE: "now take same bow, same draw length, just change arrow weight and shoot, you will get slower speed but KE will always,I repeat always, be more. and the heavier the arrow gets the more KE you will get, even though it is going slower. You will need a Chronographs to measure the speed at the bow and and grain Scales to measure the weight of the arrow."


Bees,
You are absolutly correct, but take this into consideration:
a 300g arrow produced speeds of 273fps and energy of 49.66 ft-lbs
a 600g arrow produced speeds of 201fps and energy of 54.16 ft-lbs
that means velocity loss = 26.2% and kinetic enery gains= 8.3%
Those are huge losses for minimal gains.
(actuall test may be viewed at: http://www.dundeesportsmansclub.com/dundee%20pic/dundeesportsmansclubinc.compoundbowselectionguide. htm#ketest)

Additionally I personally went from a 447g arrow (speeds of 248fps) to a 369g arrow (speeds of 269) and a loss ofonly 2ft-lb of energy, from 61ft-lbs to 59ft-lbs. But at thirty yards my window to miscalculate yardage went from 3yds (above or below) to 6yds (above or below) still hitting the kill zone.

The old addage "fast miss/Slow kill" doesn't hold water. The extra speed gives me a wider margin for error in estimating yardage! And the kinetic energy? PAALEEEASE! I can drop down to 40ft-lbs and still kill a deer.

RE: Slightly disappointed Speed Performance
 

y'all are cracking me up with your KE. KE never did squat to a deer, i can guarantee you that. where's the darn physics folks, lets burn this barn again LOL.

RE: Slightly disappointed Speed Performance
 

The wife and I hunted together last Friday evening off the ground and as we sat about 10 feet apart, I called "Texas style" with a rattle bag, grunt and can calls. I made as much noise as I could to sound like there was one H3LL of a fight and it paid off very well;)

This buck came in to 6 yards where Patty made a perfect heart shot on him and he dropped in sight after a 50 yard scramble. We weren't using any kind of a blind, only sitting in front of tree stumps. her bow set up was an '05 Bowtech Defender set at 55 pounds and 26 inch draw shooting Easton LightSpeed 400's with a Muzzy 100 grain 3 blade. Though the arrow stopped in the off shoulder, it centered the heart and it was all over in 7 seconds. Her K.E. of the arrow was around 48.5 foot pounds,, all she can generate with her draw and arrow weight.

For hunting,, shoot as much K.E. as you can develop and shoot accurately with your set up and simply live with the results, you'll do just fine;)

RE: Slightly disappointed Speed Performance
 

'Nother look.

RE: Slightly disappointed Speed Performance
 

that's some seriously nice placement right there. tell her congrats, and good job calling there buddy.

RE: Slightly disappointed Speed Performance
 

Yes it was a good shot,, she's still jabberin' about that hunt today!!:D She did a GREAT job of "holding it all together", she held at full draw for about 2 minutes while he licked branches and made a scrape at 20 yards. Then he turned and started coming closer and finally turned broadside at 6 yards where she stopped him with a grunt:)

Heere's a pic or my best for '05 and her's

RE: Slightly disappointed Speed Performance
 

Very nice--congrats