Great job blodg! I would love to have something like that setup so I could take measurements of some of my bows. I think it would prove to be a very useful tool indeed.

As for the this Ohio/PA shootoff...count me in...provided it isn't something big like that IBO Triple Crown event. I just plain fold under pressure.....

I moved the draw stop to various positions and measured the valley on my jig to determine the affect of moving the draw stop. The bow was set at 63 lbs. while measuring for the following graph:




Note that "out" refers to moving the stop away from the limb, "in" is moving it in torward the limb.

My data with a sample size of 1 agrees with Len in that I gained 1/4" DL by when moving the stop to the 80% position. The valley is also the largest at the 80% position. I can't imagine anyone ever shooting at the 50% position because it feels like there is zero valley and wants to take off if you even breath away from the stop. I read somewhere that twisting the cables 2 or 3 turns can increase letoff and give a little more valley. I am going to set the stop for my 27 1/2" DL and try twisting the cables to see if I can go from current 68% to 80%. Will need to wait until I get my press from WWAG.

Again, great information. Would you mind posting the raw data from the original draw curve or replot showing data points. Looks like you are using Excel scatter with no data points and smoothing. Also, in your original post you quoted 304 ft/sec but I'd really like to know if that's your measurement or Bowtech's.

Thanks!

Well, the Ohio boys needn't worry about rain. At least after we whoop ya. We can hang out in the BowTech Hotel. The Pa guys can stand under the awning.

buckeye,
It's on like Donkey Kong! I'll show up with a box of tissues, that way you can wipe your eyes after us PA boys get done showing you what shooting a bow is all about

Yeah right.... If I keep shooting like I have been, my fellow Pennsylvania boys will be tryin to pass me off as one of you buckeye fellows

Matt I figured it out with the help of the picture you posted. From your description I started wondering if the Old Glory had the sight mounting holes drilled in a different location. My assumption was correct! I measured the middle of my sight bar at 3 3/4" above the burger button hole. I placed your picture next to a pic of mine and if my scaling is correct the Old Glory has the sight bar 3" above the BB hole. That would explain why I had to move the mounting bar for the sight housing to the lowest holes. The center of our sight housings above the BB hole are actually pretty close. Oh, by-the-way I shoot a 4 finger Carter and anchor with the string about 1" below the corner of my mouth, not a "high" anchor at all. I have read that others had problems with sight adjustment on the Allegiance, it looks like they figured it out for the Old Glory. I will have to look if I can drill and tap some new holes in the riser.

Edit - just looked and no room whatsoever to move the holes, the current sight mount holes are directly above a cut-out in the riser.

Now BM better get practicing up Troy, Phil and I are going to be bringing some HC class game to the hills and hollers of NW PA. And to steal Muzzys quote I don't think you "country pumpkins" can handle the heat.

The 1st annual battle of BowTech. The Bucks vs. The Country Pumpkins

Sylvan, I can post the raw data here or I could just send you the entire Excel spreadsheet. Leave me your email if that's what you want me to do. And thanks for the formula to calculate arrow speed, I will plug her into a spreadsheet, although I do not plan on shooting it at the full 70 lbs., I used that number because of the IBO speed standard, will probably shoot 63 to 64 lbs.

Also, the birth certificate that came from BowTech's factory testing listed 299 FPS at 27 1/2" DL, brass nock, string and cable silencers, 70 lbs, 350 grain arrow. When creating the graph I had the DL set at 27 3/4" which will add a few FPS and I added a couple more to simulate speeds without the string and cable silencers since efficiency testing usually is done with a bare string. I did not shoot it through a chrono but feel confident that my 304 estimate is within 1 FPS and more than likely on the low side since they say to figure "5 to 7 fps" for the brass nock and silencers.

I had to do the same with my Hogg-it on my Allegiance.

THanks Blodg!

If you could just post here that would be great.