So I was curious what my setup was shooting. 2008 Diamond Marquis 60# 30" draw with FMJ's. I used online tools to do it. How's it look compared to the rest of you? This should be good with my plans to shoot Spitfire Edges or MAXXs this fall. Bow IBO Speed 324 Draw Weight 57 Draw Length 30 String Weight 10 g Arrow Length 28.75 Weight 10.2 g/in Insert 25 g Point 100 g Nock 12 g Vanes 18 Total 448.25 ~(445-450) Speed: 259-257.33 fps Kinetic Energy: 66.3-67.05 ft/lb Arrow FOC: 10-12%
looks good I shoot a helim at 62 lbs at 29 in draw with a fmj and shot a boar with it last year the arrow went though the pig like he was not their this year I will be using fmj and the new piledrivers
Not sure if you used this site; but Easton has a KE calculator <link> | Easton Archery that pretty much matches what you calculated (using your numbers.) One thing I realized was that a lot of KE calculation sites (including the Easton site) did not remind people to take tip weight (much less vanes and/or knocks) into account when computing their calculations. I wonder how many archers out there are thinking they're only getting mid-50s KE due to forgetting to add the 100gr+ more that their arrows actually weigh with a head on it. For example: 340gr (arrow only) @ 280fps = 59.2 foot pounds KE 460gr (arrow+100gr tip + 10gr vanes + 10gr nock)@ 280fps = 80.1 foot pounds KE Just food for thought.
Most online speed calculations are off. Most dont account for efficiency drop off with lighter arrows. Shoot through a chrono and then calculate if you you want accurate ke and momentum. Sent from my SAMSUNG-SGH-I317 using Tapatalk 2
The OP asked for comparisons and here I go spouting nerd tech talk... I'm shooting a Mission Ballistic @ 65lbs, 31" 340gr Victory V3s with 100 gr field points and 20gr Lumenocks @ 275fps at 10yards... not sure how much my Blazers and inserts weight but can't be more than another 20gr total, right? So call it 480gr of total arrow weight. Sooo, using Easton's calculator, I got 80.62 ft/lbs of KE @ 10 yards. I'll have to shoot a chrono at distances to see what speed I'm flying at distances of 25-40 yds to calculate for loss of momentum. Interesting topic. What baffles me is I seem to be getting same penetration at 20 with 100gr tips as I do at 30 with 125gr tips, but at 40yds I'm way better off with 100gr. It's like the 125s just die after 30.
