170 fps w/ ACS-CX

[limbow]

I built out my rest and shoot axis 400/500's w/100gr brass insert upfront and 125 point, total weight is 465. It has improved the flight tremendously. My ACS CX is 47#@28", I have not run it through a chrono yet, but to the eye it out shoots my 54# Silvertip recurve.

[snag]

What is a good way of building out the rest? I use velcro or seal skin now for the side and the shelf. Should I just put 2 layers on the side?

[Precurve]

What I've done with my other bows is take a short piece of new leather shoe string and split it in half length ways.  If I use an old leather shoe string I don't split it, as the stretching usually thins it down to the thickness I'm looking for.  I put a little barge cement on the short length (1/2" or less) of leather string, lift the side plate and insert it in the vertical position so that it lines up with the deepest part of the throat of the grip.  I repeat this with the shelf rug, putting the short piece of string at a 90 degree angle to the arrow shelf, again in line with the deepest part of the grip.  I usually wrap some dental floss around the riser several times to keep everything tight and in place until the barge cement dries.  It's always worked great.

[snag]

How about some double-side adhesive tape and then putting velcro over that? I have some tape that is about an 1/8" in thickness. I don't know if it will hold the velcro on though.

[limbow]

You need to build it out in one spot, not the entire plate, I slid a matchstick behind the velcro plate that came on the bow, that's all it took.

[Shawn Leonard]

I did not read all the post but those numbers are wrong. I have a 45# Bear K-Mag and at 9gpp drawing to 28"s it does 176fps, so I am sure the chrono was screwy. Shawn

[snag]

Thanks Limbow I'll try that before I go to replacing the velcro.

[Pete W]

Have someone else shoot it thru the chrony. People can vary a lot in the release. If you creep that drops speed a lot too.
Also do you have tight nocks, this can slap off 10 Fps easy,

Draw the cx to anchor, and have someone mark the arrow at the front of the bow,then measure it.or mark the arrow at 28" and have someone witness where you are drawing it to.

Pete

[T-Bone]

For a 550 grain arrow and 170 fps from a 52# bow, those are exceptional numbers from that bow.  You are getting over 35 pounds of ke and really good momentum as well.  That comes out to 10.57 grains/lb.

[d. ward]

One more little factor,while chronying some bows last spring.One of the guy's at my shop was getting 7-9 ft.per.sec.faster from the same bow and same arrow length then the rest of us.Video tape showed us he just had a super clean release real smooth..I thought that may play a little into well 7-9 ft per maybe pending on how clean the shooter gets off the string.We tested the same bow same arrow same length draw with a machanical release and it was about 10-12 ft per sec.faster..... Maybe???????????? bd

[Jim Neaves]

If you are wanting to chrono a bow at 28" you must actually make a mark on the shelf of the bow directly above the throat of the bow. This is the only spot bow to bow that will be consistant because the back of a bow will very in distance from the throat, bow to bow. For instance you may have a bow where the back is 2" from the thoat of the bow so if you draw an arrow that is marked 28" from the inside of the nock, then on that particular bow you will actually only be drawing it to 27 3/4". This is where many people do not standardize and they short draw some bows and over draw others. The standard for depth of shelf as far as measuring is concerned is 1 3/4". To do this correctly you make a mark on the shelf directly above the throat of the bow. If you want to measure the bow at 28" then you mark the arrow at 26 1/4" from the inside of the nock. You then draw the arrow back until the mark lines up with mark on the bow directly above the throat. Now you are comparing apples to apples as far as draw length is concerned. Many mis-accurate readings are done because people just do not know any better.

Thanks, Jim Neaves

[sticshooter]

Jim I'm slow so explain to me what the throat is? Like a pic maybe? I like pics.LOL <><

[Pinelander]

Yes, Jim makes a good point about the throat of grip and 26-1/4" measurement. I believe the ACS-CX is only 1-1/2" out from the throat to the back of the shelf. So the 1-3/4" out from the throat is actually 1/4" before getting to the shelf.

Frank, the throat is the deepest part of the grip.

Most ACS-CX's drawn 28" should be doing around 190-195 fps at 9 gpp, and 180-185 fps at 10 gpp.... regardless of the bow poundage.

Snag, be patient and build that sideplate out so that the right side of the shaft is lined up with the center-line of the string. Work on getting the best bareshaft flight you can and your patience will be rewarded with one of the best shooting bows available.

[kawika b]

Piney,,,Is the distance you mention do-able on any spine configuration? I notice my Beman MFX Classic 500 showing a little weak out of my 52#@25" CX,,, don't wanna cut if I can get away with buliding out the side plate to compensate. Sorry for the hijack snag,,, glad your tune is gettin better though.

[Pinelander]

When it comes to bows that are cut PAST center (like the ACS) I usually only go out as far as the right side of the shaft (for RH shooter). But there are many bows that are only cut TO center and the shaft obviously sits out further from the string center. Doesn't matter though, just need to adjust length or point weight and they tune fine. Don't forget.... lowering the brace height makes the shaft act stiffer and raising the brace makes the shaft act weaker, doesn't take much if you're already real close.

[Sixby]

Pinelander, I question why you would purposely take an arrow out of centerline to the string. Why not center the arrow on the string if the bow window is cut to do that? I do and with the correct spine get absolute perfect arrow flight. If you go to the right side then you have to use an arrow that is less spine so that it flexes around the window. Sorry but that does not make any sense to me. Could you explain.

Thanks Steve and Happy New Year everyone