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View Full Version : im trying to figure out my fps on my 2010 bengal...



gravedigger
02-05-2011, 08:48 AM
well this is what ive got.2010 bengal set with acutrac cams,stock string,the roller ccs,and the sts.28.5 draw length.shooting at 73 pounds.my arrows are goldtip pro hunter seires 0.001 straightnes.100 grain field tip.arrows are rated 75-95#.how can i figure out what fps im shooting at.i know its fast and i am verry happy with it.but i am just looking to know more about my bow.

Money Man
02-05-2011, 09:14 AM
You could figure out fps by using a chronograph, but if you don't have access to one, alot of guys on here say the calculator at http://www.backcountrybowhunting.com/articles/calc/ seems to be pretty close. Good luck, keep us posted.

gravedigger
02-05-2011, 10:29 AM
well i used that calcuator and it said im shooting 328 fps.and 81 foot pounds or torqu.if thats right then wow,it got some zing behind it.

Arrow Splitter
02-05-2011, 10:52 AM
well i used that calcuator and it said im shooting 328 fps.and 81 foot pounds or torqu.if thats right then wow,it got some zing behind it.

When I ran your specs the calculator showed me only 301 fps and 73 ft. lb. of kinetic energy, which is excellent, but not the speed you stated.:confused: I don't know what your arrows weigh, but I used the lightest weight the calculator told me for your setup.

bfisher
02-05-2011, 12:12 PM
Working up the arrow on GT's website it comes up to 420 grains. That's figuring a 28" shaft, 2" Blazers, acculite nock. Plugging the numbers into Backcountry calculator and using 317 fps for IBO speed, 20 grains on the string it calculates a speed of 281 fps with 74 lbs.ft of energy.

This would probably be the maximum speed your bow will achieve if it's tuned very finely. Real world? I'd subtract some more and estimate that it's more like about 270 fps.

A lot of people over estimate things. I've had a lot of people say my arrows are zipping along at 300 fps when in reality they were only dong around 250 to 260. So much for eyeballs.

gravedigger
02-05-2011, 02:00 PM
i will have to find a range that can get me on a radar or something.i dont know all the tec terms.but like i said im happy with it.i just took it to my local dealer he went threw it for me.on tuesday im going in to get a new string put on.does anyone have any sugestions on what to get.if not im going with winners choice.

gravedigger
02-05-2011, 02:04 PM
really i would like to pump it up as mush as i can.its my first bow.im doing great on my groups.just trying to get ready for elk seson.i have a nice outdoor 3d range with 40 real life condition targets and i have been spending a good amount of time ther and im not doing bad at all.

Hutch~n~Son Archery
02-05-2011, 02:06 PM
i will have to find a range that can get me on a radar or something.i dont know all the tec terms.but like i said im happy with it.i just took it to my local dealer he went threw it for me.on tuesday im going in to get a new string put on.does anyone have any sugestions on what to get.if not im going with winners choice.

If you have a dicks sporting goods around you can put a few arrows through there chronograph and find out what speed you are doing. They don't charge much to do that. As far as strings many different makers but try H&M strings or go to archerytalk and look at the string builders on there.

HUTCH

gravedigger
02-05-2011, 02:24 PM
i do have a dicks sporting goods about 15 miles from my house.i will have to head out ther.thanks for the tips.

Hutch~n~Son Archery
02-05-2011, 02:36 PM
One thing to remember all your specs need to be right to get the most out of a bow. The ATA, BH, Cam position, Draw length. With all this correct the bow will preform well.

HUTCH:cool:

gravedigger
02-05-2011, 03:33 PM
my arrows are 8.9gpi cut at 27.5 with gt knocks and vane tech vanes.i got ni light,heavy weight arrows.and archers afield tuned it all sorts of nice for me.i will post what the fps is after i go to dicks sporting goods this week

Spiker
02-06-2011, 06:26 AM
i will have to find a range that can get me on a radar or something.i dont know all the tec terms.but like i said im happy with it.i just took it to my local dealer he went threw it for me.on tuesday im going in to get a new string put on.does anyone have any sugestions on what to get.if not im going with winners choice.

PM Archerx7 on here about string/cables.

Hutch~n~Son Archery
02-06-2011, 12:48 PM
Sorry archerx7 I forgot you make strings I will have to remember to promote you as a string maker.:D

Hutch

RLW
02-07-2011, 01:22 PM
my arrows are 8.9gpi cut at 27.5 with gt knocks and vane tech vanes.i got ni light,heavy weight arrows.and archers afield tuned it all sorts of nice for me.i will post what the fps is after i go to dicks sporting goods this week

Ran it thru a program and if assuming an IBO of 315 / 80% let-off along with on previous data given and this additional info, looks like a 385gr arrow coming out at +/-298 fps......close to 76 on your KE

Looks like a nice arrow for that set-up.

gravedigger
02-07-2011, 02:37 PM
i went into the shop looking to spend money on the best i can get(and they had no problem taking the money)for my bow.im going with winers choice,it will be instald next week.i was going to dicks sporting today to get a definate reading on fps,but superbowl got the best of me.maybe tomorrow,i will post my fps for sure this week.so far thanks for all the help and info.i will try to post some pics.

gravedigger
02-08-2011, 08:56 AM
here is a cell phone pic,it really does not do it justice.but im happy with it

WestMichiganBowhunter
02-09-2011, 04:24 AM
not to burst your bubble, but i just chrono'd mine and i was at 265fps
my specs are
29 draw length
67lbs pull weight
344 grain arrows, carbon express maxima's 250, 29 3/8ths long...
vapor trail strings which are in excellant shape....
Martins whisker biscuit...if i were to go to a drop away i would gain 3-5fps more....

so i would have to think you would be around 270 fps.....
I've been researching the martin bows speed online for days....& i've come to the conclusion that the martin bengals, moabs, tr1 firecats are 10-15 fps slower than the advertised ratings.....
it's dissappointing, but it's reality.....
does it shoot good still, yep, it will still go thru deer.....
I'm getting 265fps.....
i should be around 285fps at the worst.....
I'm losing 20-25fps somehow....my specs seem to be in order and the the cam is in sync......
Martin really should put the bengal type bows fps around 305fps instead of 315-320...it would be more truthful......

*here's the funny thing, it's shoots very flat out to 30 yards.......that's what puzzles me.....
my 20 yard pin is good to 30 yards....
I'm tempted to sell it cuz i'm losing 20-25fps......

RLW
02-09-2011, 05:15 AM
not to burst your bubble, but i just chrono'd mine and i was at 265fps
.........I'm losing 20-25fps somehow.......
I also think the 320 end of the IBO rating is a bit optimistic, BUT also I still think something isn't quite right with yours.
You can see in my signature that I shoot 65lbs at 29", with 426gr arrow at 270fps. Recently made a vane change on my arrow putting 6 arrow average at 422.1grs. Had nice weather here Saturday and shoot a few rounds outside in good light thru my chronograph......dozen or so shots ranged from 270 - 272, averaging out at 270.6

I do want to mention that when I first took the chronny out, is had been sitting in a cold shed and it was mid morning winter light. First shots were 80, 86 and 121.
Went back in until early afternoon for sun and temps to rise and started seeing my typical +/-270 speeds again.

WestMichiganBowhunter
02-09-2011, 05:31 AM
I also think the 320 end of the IBO rating is a bit optimistic, BUT also I still think something isn't quite right with yours.
You can see in my signature that I shoot 65lbs at 29", with 426gr arrow at 270fps. Recently made a vane change on my arrow putting 6 arrow average at 422.1grs. Had nice weather here Saturday and shoot a few rounds outside in good light thru my chronograph......dozen or so shots ranged from 270 - 272, averaging out at 270.6

I do want to mention that when I first took the chronny out, is had been sitting in a cold shed and it was mid morning winter light. First shots were 80, 86 and 121.
Went back in until early afternoon for sun and temps to rise and started seeing my typical +/-270 speeds again.

idea here
maybe i should send out my bow to either you or hutch and son and have ya tune it...?
the way the string is in relation to the cam, going from the photos online here and other sites....my string and cam are good.....
my ata measurement was 32 7/8 approx and the brace height was like at 7 inches...

I'm also thinking this is a bunch of BS with my bengal if i'm perfectly tuned......lol
I don't think the chrono machine was off on it's #'s........the archery shop owner was there helping us with the machine...and his indoor shooting arena was very warm in there...like 70 degrees.....
the last time i shot 265fps was when i owned a mathews switchback at 62lbs.......& that was with 377 grain beman ics 500 arrows....

I will say that the string is touching the sts a bit firmly.....probably need to shave down the sts rod and then put the rubber stopper back on.

RLW
02-09-2011, 05:40 AM
idea here
maybe i should send out my bow to either you or hutch and son and have ya tune it...?
the way the string is in relation to the cam, going from the photos online here and other sites....my string and cam are good.....
my ata measurement was 32 7/8 approx and the brace height was like at 7 inches...

I'm also thinking this is a bunch of BS with my bengal if i'm perfectly tuned......lol

Factory axle-to-axle is closer to 32.00"......anyway, bottomline if you like shooting it and it's cleanly putting an arrow where you point, the speed doesn't matter.

WestMichiganBowhunter
02-09-2011, 05:50 AM
Factory brace height is closer to 32.00"......anyway, bottomline if you like shooting it and it's cleanly putting an arrow where you point, the speed doesn't matter.

if my ata is longer by a few 8ths of an inch.....what does that mean or do....and does that figure into the quality control of martin...?
how do you get it back to spec....?

Arrow Splitter
02-09-2011, 05:59 AM
Factory brace height is closer to 32.00"......anyway, bottomline if you like shooting it and it's cleanly putting an arrow where you point, the speed doesn't matter.

X2. Brace height is supposed to be about 32.00", as RLW said. I also agree on the other point, that if the bow is accurate, speed is not really a concern, unless you were only shooting 240 fps or something.:eek:

Arrow Splitter
02-09-2011, 06:01 AM
if my ata is longer by a few 8ths of an inch.....what does that mean or do....and does that figure into the quality control of martin...?
how do you get it back to spec....?

Just twist your cable a few times, then measure the ATA. If it is still not right, then repeat the process.

WestMichiganBowhunter
02-09-2011, 06:21 AM
Just twist your cable a few times, then measure the ATA. If it is still not right, then repeat the process.

twisting your cables a few times will bring the ata back down to spec....?

RLW
02-09-2011, 06:22 AM
....?

I just replied back on your original thread on my "guess" of what's happening.
http://martinarchery.com/mtechforum/showthread.php?p=38397#post38397

WestMichiganBowhunter
02-09-2011, 06:45 AM
I just replied back on your original thread on my "guess" of what's happening.
http://martinarchery.com/mtechforum/showthread.php?p=38397#post38397

i just replied back

it's the F5 module

MLN1963
02-09-2011, 09:46 AM
To help me understand this can I ask some questions?

By twisting the cables and shortening the A2A by 7/8" and bringing it back to 32" he's going to preload the limbs more and I assume get some of that missing speed back? If he does that will he have to twist the string too to shorten it? Will any or all of this change his draw weight or draw length?

gravedigger
02-09-2011, 11:54 AM
i just got back from dicks and drum roll please..........308 fps.now thats not too bad. befor any one starts saying b.s. on my fps.i put 12 arrows through it 3 at a time just to make sur and i avarage 308 fps.

Arrow Splitter
02-09-2011, 01:06 PM
i just got back from dicks and drum roll please..........308 fps.now thats not too bad. befor any one starts saying b.s. on my fps.i put 12 arrows through it 3 at a time just to make sur and i avarage 308 fps.

WOW! I'd say your setup is VERY fast. The calculator was about 10 fps off(based on RLW's calculation, not mine).

gravedigger
02-09-2011, 01:15 PM
WOW! I'd say your setup is VERY fast. The calculator was about 10 fps off(based on RLW's calculation, not mine).

i am very happy with the read out.it cost me 5.99 per 3 arrows.i did not belive whats he was telling me so i shot all 12.it cost a bit to use there machine but in the end it was worth knowing a bit more about my bow.plus all the feed back ive been getting,how short of a time i have been flinging arrows and how under educated i am on archery i am at this point i needed to really make sure it was really 308 fps.

Arrow Splitter
02-09-2011, 01:18 PM
it cost me 5.99 per 3 arrows.

YIKES!!:eek: At least you know your speed now though.
Just stick around here and maybe you'll pick up so more knowledge, you never know.:)

MLN1963
02-09-2011, 04:33 PM
Good God, $2 an arrow? I would have told them where they can stick those arrows!

gravedigger
02-09-2011, 05:56 PM
Good God, $2 an arrow? I would have told them where they can stick those arrows!
yep it was spendy.but they are close by and i really wanted to know.

elkslayer4x5
02-10-2011, 11:05 AM
YIKES!!:eek: At least you know your speed now though.
Just stick around here and maybe you'll pick up so more knowledge, you never know.:)

Guess you and Dad are going to get a chrony for the shop? :D

gravedigger
02-10-2011, 11:12 AM
what is the price rage for a crono?

Hutch~n~Son Archery
02-10-2011, 11:22 AM
$69.99 UP T0 $599.00 START SAVING THE PENNIES!!!!!:eek: Wife is going to kill you. Probably with your own bow by beating you.:D:D:DLOL

Hutch

MLN1963
02-10-2011, 12:36 PM
Wife is going to kill you. Probably with your own bow by beating you.:D:D:DLOL

Hutch

There is a silver lining to every cloud. If she does this you will surely need to replace that 2010 Bengal with a 2011 or 2012! :D

Arrow Splitter
02-10-2011, 02:13 PM
Guess you and Dad are going to get a chrony for the shop? :D

I hope so!:D

gravedigger
02-10-2011, 04:39 PM
$69.99 UP T0 $599.00 START SAVING THE PENNIES!!!!!:eek: Wife is going to kill you. Probably with your own bow by beating you.:D:D:DLOL

Hutch

wow.that is spendy at the top price.she has a pump action 30-06 i think she would shoot me if i came home with one.maybe on next years tax returns i will get one.who knows i might be able to make a few bucks off it.

Hutch~n~Son Archery
02-10-2011, 04:45 PM
Check for deals like sportsman guide, eBay, and other places they will run specials. The higher price ones are for plugging into the computer and running programs for target shooters.

HUTCH:cool:

gravedigger
02-10-2011, 04:52 PM
Check for deals like sportsman guide, eBay, and other places they will run specials. The higher price ones are for plugging into the computer and running programs for target shooters.

HUTCH:cool:

i did not know that..see learn something new every day.thanks.i thought 2010 was the last year for the bengal.

Arrow Splitter
02-10-2011, 05:37 PM
i thought 2010 was the last year for the bengal.

You are correct, production of the Bengal ended in 2010. The 2011 Ridge Hunter is basically the same thing as the Bengal.:cool:

Hutch~n~Son Archery
02-10-2011, 05:42 PM
i did not know that..see learn something new every day.thanks.i thought 2010 was the last year for the bengal.

The 2010 Bengal is a done deal and not made anymore. I was refering that you could get your self a chrono look at sportsman guide and ebay.etc etc.


Hutch :cool: