348 FPS?
 

Someone I know told me they shoot at 348 feet per second. Do you think thats bull****?

RE: 348 FPS?
 

Considering I witnessed a Forge bow with a 8 1/2" brace height set at 57 lbs shoot 303 fps I wouldn' t be so quick to chalk it up to b.s.! That was our proshop owners son tweaking his bow for a tournament. I' d venture to guess that with a speedburner like a bowtech , it would be easily done.
Can you say 3 or 4 grains per pound of draw;)

RE: 348 FPS?
 

i sure hope there is a lifetime guarentee on that bow with no questions asked

RE: 348 FPS?
 

Why anybody would want to shoot 348 fps has got my pistol corked!;)

RE: 348 FPS?
 

Depending upon the bow 348 is VERY possible even with IBO specs of 30" /70# and a 350gr arrow. The only bow I know of that has a shot at 348fps at these specs is the BowTech Black Knight Dual cam. Both the high brace height version and the low have a spped rating of 350fps at the top end. (The Low brace model is rated at upwards of 350fps with a 29" draw length!)
IF someone shot that speed then there is a good chance that they had this bow........or it could be quite possible that they are shooting any number of the really quick bows on the market at under 5grs per lb of draw weight.

Here' s an example........My BowTech " Pro38" dual cam shot at 70#/30" shot a 350 gr arrow 336fps with a string loop on the string.........with a small tie in nock set I' m sure I' d be at or over 340fps.....and that was with a 6.75" brace height. And that wasn' t even pushing the bow.

ALso my new BowTech Patriot Dually at 30" /70# shot a 375gr arrow at 319fps, and that was with a string loop and SIMS Leeches........and oh yeah.......a 7 7/8" brace height![:-] If I stripped off the leeches, and brought the arrow weight down to 350grs I would most likely bring the speed over 330fps without much trouble.

Your friend could very well be feeding you a line of bull.............BUT there are bows that can do it.

RE: 348 FPS?
 

Another option...could be a high poundage bow (or even a longer draw length bow).
The bowtech sampson at ~77-80# and an IBO arrow should get you there.
But I would agree that it is more likely your leg is being pulled.

RE: 348 FPS?
 

your friend is bragging about speed but how is his accuracy ? missing is missing no matter what speed you do it at

RE: 348 FPS?
 

just heard through the vine that hi country is going beyond 375 fps mark....
matthews backmax 2 is 330 fps.
so anything is possible....but is it shootable???

RE: 348 FPS?
 

What is the world record speed from a bow now? My pro-shop owner said that it was somewhere around 575 f.p.s. [:-][:-][:-][:-] I am not sure of any details on this, but, the bows on the market can be EXTREMELY fast if tuned just for speed. Take a fast bow, put the poundage up, put the draw length up, shoot the smallest, lightest arrow possible. Twist the string as much as possible, ect..... and you will be flinging arrows at scorching speeds. Terrible for the bow, but awsome for the whole speed part.

RE: 348 FPS?
 

Let' s not forget there are some BIG Guys out there too. I know a guy that pulls an 86#PSE at 32" draw...he shoots real close to 330. Big weight and long draw go a long way. He shoots 6.5 grains per pound too;)

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RE: 348 FPS?
 

He says he uses one pin all the way out to 50 yards, but beyond that his arrows do not have enough energy left.

RE: 348 FPS?
 

He has to change strings at least 2x a year.

RE: 348 FPS?
 

I heard from a coworker that when he shoots it sounds like a gun.

RE: 348 FPS?
 

Yesterday he asked me where I shoot and he said he had noone to shoot with, and he wants to get together and shoot sometime. A little friendly competition? I gotta get the shots for my back first b4 I can pull my bow. I hope the shots work.

RE: 348 FPS?
 

Krisken,

I do not mean to be argumentative but this is not necessarily a true statement. For example....

A 60 lb bow shooting a 300 grain arrow might have a hypothetical speed of 260 fps. Then, lets look at the same hypothetical bow shooting at 70 lbs with a 350 grain arrow. When you increase bow poundage you will have an average gain of approximately 1.75 fps for each pound of draw weight. That would mean a speed increase of 17.5 fps for the 10 pound difference in draw weight. But since you are increasing arrow weight by 50 grains to keep the ratio at 5 grains per pound you also need to subtract approximately 10 fps. If we combine the two figures then that results in a net gain of approximately 7.5 fps by increasing draw weight by 10 lbs while maintaining the 5 grains per pound of draw weight ratio.

A more accurate statement might be that increasing draw weight doesn' t offer a significant amount of additional speed if the person maintains a 5 grains per pound of draw weight ratio.

I did not want to seem like I was lecturing but this is a commonly misunderstood issue. :)

RE: 348 FPS?
 

who said he was shootin five grains per lb. I can deviate from the rule and shoot a light arrow weighing 244 grains and get 287 feet per second out of 52 lbs and 27.5 inch draw. My buddy shot the arrow from his 72 lb pull and got 315 feet per second once. :)

RE: 348 FPS?
 

Are dual cam bows generally faster then a single cam??

What' s the trade off in design differences?

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RE: 348 FPS?
 

Krisken,

I do agree and said as much in earlier post....ie...." ...doesn' t offer a " significant" increase in speed...." .

But then there is Kinetic Energy numbers.....:D

..................

...and I also agree that current dual cam designs are faster than their single cam counterparts. That was not always the case until Bowtech came onto the scene.;)

I would also worry about someone that needs to change their string/cable setup twice a year. I do not think that the gain is worth the effort.

RE: 348 FPS?
 

I, on the other hand, enjoy sounding like I am lecturing. ;)

KE = m*v*v/2 = energy stored in the bow * bow efficiency = S * E

v = square root of ( S * E * 2 / m)

Increasing the poundage increases the stored energy at the same rate as the mass is increased and the velocity is unchanged, if one shoots the same grains per pound.

I.e., Krisken is exactly correct as long as you keep all the efficiencies the same.

RE: 348 FPS?
 

All I know is this guy has a 3 year old PSE and shoots 327fps??? How the hell? He says he pulls 90#, but I made him put it on the scale and it was maxed at 86#. He also told me he shot 6.5 grains/ pound, but I didn' t weigh the arrows so???

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RE: 348 FPS?
 

bprepn,

Not to contradict you my friend but my above example is right on the money for a majority of the bows out there. There is a larger speed increase for the increase in draw weight in comparison to the decrease in speed for the increase in arrow weight.

I would be more than happy to do this comparison on any bow out there.

To put it very simply, a 70 lb peak draw weight bow shooting at 5 grains per pound of draw weight will shoot several feet per second faster than a 60 lb peak draw weight bow shooting at 5 grains per pound of draw weight. One effect does not equally cancel out the effect of the other. Equations on paper are fine but practical experience tells me otherwise. ;)

RE: 348 FPS?
 

PABowhunter,

I never tested this with two different cams but you are correct if we are talking about the same cam set at 60# and then at 70#. I have always been told and have read a cam is always designed have the highest efficiency at it highest draw weight and longest draw length.

Have you tested this with two different cams? A max at 60# and a max at 70#.

Toby

RE: 348 FPS?
 

Toby,

Sorry it took so long to get back to you. I have tested it on several different make and model bows. Both a 60 and 70 pound peak draw weight comparison as well as one bow set at 60 and 70 pounds. There is a much more pronounced difference with the latter but there is still a difference in speed with the former as well.

However, the actual speed difference varies significantly from model to model and also depending on the grains per pound of draw weight ratio being used. Some bows might only see a speed difference of 2-3 fps whereas I have shot others that varied by 8-9 fps (60 and 70 lb peak draw weight comparison). My suggestion of 7 fps was the easiest to actually prove using the normal generalizations, however, 4-5 fps would be more of the average of what I have found.

RE: 348 FPS?
 

I' m with PA on this one.

and as has been mentioned...dont forget about KE

not only will the higher poundage bow be abit faster...but the heavier arrow it shoots wont lose speed as quickly.