IBO
 

How much less than the advertised IBO does a bow normally shoot? I know there are a lot of variables to be included in this, but is there an average?

RE: IBO
 

The Bowtechs seem pretty close. Each one comes with a "birth certificate" where it was chrono'ed with a 5 gpi arrow. The biggest deflater of IBO seems to be that fact that most folks don't draw 30"; and we tend to put stuff on our bowstrings to quiet them down that hurts speed. Not to mention the tendency to run arrows heavier than the minimum - to get better penetration.

The only bow I have owned that was weak on IBO was the Fred Bear Element I got for my son in 2006. Calculating backwards from the chronograph, I came up with an "real" IBO of about 290. Manufacterer specs were just over 300.

RE: IBO
 

for a bow fully setup for hunting and an "average" shooter you generally loose 30-40fps off of IBO. thats "average" arrow weight, draw weight, legnth and string setups...sometimes more sometimes less...you shoot heavy arrows on a short draw and like a longer arrow and light draw weight, your going to loose more than the guy that likes a light arrow, as short as he can get them and shooting a maxed out bow...

30-40fps is usually pretty ballpark for a hunting setup though...

RE: IBO
 

Mauser is pretty close form my experience 30-40 fps less would be close with a " Hunting " set up

RE: IBO
 

my bt general shot 275 with 29.5"draw at 71#'s. with a 500(total)grain axis fmj with blazers and a whisker biscuit. i thought it was pretty good honestly. that is a heavy ass arrow. and on its birth certificate it said 300 even so a 25fps loss with that heavy hunting setup isnt too bad to me.

RE: IBO
 

Yeah that is pretty downright smokin' if you ask me.... I have an Iron Mace (pretty much same cam system as your bowtech) that is doing 282 at 63#s with a 454gr ACC at exactly the same draw as you. I'm shooting 346grs right now at flat 60 and whipping right at 305fps hunt ready.

RE: IBO
 

On my Legacey the IBO is 308 fps. I shoot a 28.5" draw and the best I could get out of mine was 294fps, shooting at 70# with a 28" 350gr. arrow, so I lost 14fps with a 1.5" shorter draw.of course my hunting set up is different, I shoot a heavier arrow.

RE: IBO
 

I got 311 from a 370 gr arrow (292 with a 430 gr hunting arrow)out of my Ally after replacing my strings and cables with Vapor Trail and messing with the position of my STS (Birth Cert has 314 I think). Drop of the STS and I'm at 294 with the 370 gr arrow.Before string/cable swap and adjusting STS I was at 283 with the 430 gr arrow.

According to OT2 my adjusted IBO is 309 now. Before it was 304. The interesting thing I drew from this is from those numbers that my bow was not as efficient with the stock string/cables and the STS in the highest position as it is now.

RE: IBO
 

The Diamond Marquis is ibo at 30" 70# 316 - 324 mine came with the birth ceritificate 311 60# 29" draw. for dropping 1 inch and 10# That isn't bad!:)

RE: IBO
 

What effect does the STS have on the speed of the bow?

RE: IBO
 

In one instance I know of, it actually increased arrow speed a couple of fps.

RE: IBO
 

The manufactures say you may gain a few FPS. I shot my bow without STS and was at 284. Shot with STS in highest position: 284. Shot it in the lowest position: 293. My buddy moved his around on his Mathews and it did not change the speed.

RE: IBO
 

None!

RE: IBO
 

Davepir:

You take off the STS and lose 17 fps? That seems like a whole lot of speed loss for an accessory like that.[:-]

As far as IBO, I have 3 bows with 29.5" draw and 60# draw weight.

The one rated 310 IBO shoots a 315 gr. arrow at 298 and a 395 gr. at 270 fps.

The one rated 316 IBO shoots the 315 gr. at 307 and the 395 gr. at 279 fps.

The one rated 330+ (not sure of the exact rating, it is a 2001 bow) shoots

315 gr. arrow at 319 and the 395 gr. arrow at 286 fps.

All of these are with a D loop and catwhiskers or string leeches only. No peep in the string.

RE: IBO
 

I'm not sure why everyone keeps getting confused by this and ignoring my whole statement.[&:]

I stated that: 10 fps gained with STS in lowest position. The other 7 fps or so is from changing out the stock string and I have chrono'd numbers to verify this.
370 gr arrow before new string and STS in lowest postion: 294
370 gr arrow with new string and no STS: 304 or so
370 gr arrow with STS in lowest position: 311

I've tried moving the STS all over the string and without STS and speed is 10 fps slower unless STS is the whole way down. :D

RE: IBO
 

Read some UNBIASED bow reports, and you'd find that nearly EVERY bow tested was short of the is "expected" IBO rating. Some by quite a bit, some by only a few fps. Hoyt seems to consistently be one of those that is REAL close to what they rated a bow at, as does Bear. I think the one that I saw that was the farthest off of it's IBO rating was probably one of the best selling bows in the country last year, and lots of guys like it, so what does it really mean anyhow. IBO ratings are like the chicks in Playboy, not in your wildest dreams will you ever get one.

RE: IBO
 

What kind of speed are you getting out of your Reflex Highlander? That's the bow I shoot at 29" and 70#. It's advertised at 305 fps.

RE: IBO
 

Puke,
Low 270's with a 415gr arrow, actually pulling about 29.25, measured, at 72#, with a little string weight. Same arrows on the Trykon mid to upper 270's, could probably tweak 280's but that's about it with a heavier arrow and string weight, with I don't intend on removing. I am about to put some new strings on it, though, and that may help a little, but I'm not really chasing speed as much as consistency anyhow.

RE: IBO
 

How much effect it will have depends on the bow. The best thing a person can do is go to a shop that has a range and tell them you want to try one and experiement with position.

RE: IBO
 

quote:

ORIGINAL: glockman55


[blockquote]quote:

ORIGINAL: pukeleeland

What effect does the STS have on the speed of the bow?
[/blockquote]


None!


Let me state that this was on my Mathews Legacy that I had no change in FPS. In no way am I saying it won't make a difference on other bows.

RE: IBO
 

There must be something with the Mathews dampeners that are near each end. My buddy get's no increase with his Switchback ST. I'd really like to have him remove them and try the STS by itself to see if there is any change.