Main Discussion Area > Flight Bows
New PB
High-Desert:
--- Quote from: Del the cat on April 13, 2018, 07:20:39 am ---
Interesting that your arrow flew straight with the COG behind centre... I've seen some fly like a corkscrew with the weight too close to centre. Maybe the fatter back end and the flights keep it going straight? Any thoughts, comments anyone.
--- End quote ---
I'm not an expert by am means, but I did testing in a ballistics laboratory. It doesn't matter where the COG is in a projectile, as long as the COP, center of pressure, is behind the COG when launched, either spin stabilized like a rifle bullet, or fin stabilized like a missile, or arrow.
Great looking bow, I hope to get performance like that out of a bow some day. Ill be doin it in yards tho.
Badger:
Interesting Desert, something I have always suspected, I started moving my COP back a couple of years ago, looking forward to trying them out.
Comalforge:
Just curious, how do you calculate COP on an arrow. From what I've read about COP with regard to bullets, I would assume the fletching imparts drag and rotation so the nose stays centered but is there some rule of thumb formula that y'all are using to estimate where that falls? Do you increase rotation or drag (larger feathers) or both?
High-Desert:
There is a lot involved with center of pressure, it's not a simple calculation since it is dynamic calculation. For example, the COP of a bullet will change as velocity changes, which is also true with arrows, but not enough to talk about since we are dealing with extremely slow velocities when it comes to ballistics. Your fletching is what shifts your COP rearward. So a higher or longer fletching will shift it back. A tapered shaft helps too because this will not only shift COG forward, but help move COP back during flight. Maybe I shouldn't use this as an example, but, the opposite of a tapered shaft would be a long range bullet where the ogive is extremely long, this creates in flight COP in front of COG, a very bad thing. So these have to be spun like crazy to over come the instability of the light weight front end and a heavy rear. With arrows, we don't have to worry about that, but tapering is a solution for flight shooting rather than increasing fletching height, along with its other benefits for flight shooting.
Badger:
I have gone with a slight front to back taper and then I come back and gently taper the front 6" just a smidgeon to adjust weight.
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