93 and better mach - so 93% o fteh speed of sound and closer to the speed of sound - the 737s best cruise is at. The biggest issue not having solid enough control surfaces, and that flexing of those surfaces mislead those engineers for years.Īnd your argument about spending time close to Mach is faulty - most of our jets spend their most efficient flight at. I understand a great deal of the space and Mach challenge era. 458 SOCOM both have highly accurate subsonic loads in AR and bolt action).Īnd I am a licensed A&P that opted out of getting an aerospace engineering degree (and wound up with a BS in psychobio - so top 20% grades in "for majors" chem, bio, and physics, at UCLA, so no slouch). If you can deal with the rainbow trajectories, you can probably get your tightest groups with subsonic bullets (.300 Whisper and. You punch through it and get to your cruising speed with all haste. Supersonic aircraft spend as little time as possible at Mach 1 because you get the crap beat out of you at that speed. Watch the first 30 minutes of "The Right Stuff" again and pretend that your bullet is the Bell X-1 going through that sonic barrier (but slowing instead of speeding up). Once the bullet is subsonic, it moves in a very predictable path again. It's the transition from supersonic to subsonic that causes all of the issues. If it is solely the going subsonic, why doesn't it happen to pistol (and other just hypersonic at muzzle) bullets/rounds?Īs usual, Randall has it right. Or a combination of BOTH transitioning from the supersonic pressure envelope to the subsonic while also having developed a little eccentricity in their spinning causes them to go critical and suddenly start tumbling. 50 cal bullets do well, as it it takes more time and inertia to overcome their ballistic spin, go critical and cause them to tumble.
This problem would seem to be one that would scale - why. Say out to 500 yds (normal factory bullets) or 800 yds (match grade bullets) before the slight wobble catches up and starts making the bullets unstable and then quickly degrade to tumbling. So now people that don't do that, and those that aren't even using match bullets at long ranges, have to just rely on factory tolerances - which are pretty good as whole. In benchrest, I know many (all?) people spin their bullets to check for concentricity to varying degrees before loading them, while most other people assume good enough from factory. I was wondering about the bullet quality - so in rifles, you get out to the long ranges 500 yd-800yds, and the LONG ranges 800-1000+yds. Why do these bullets not tumble and go scatterwonky, if going subsonic causes that to happen in bullets?
In handgun silhouette shooting, the bullets start out just above supersonic, but are often very subsonic on the long stages. I was wondering about whether it is really the going subsonic, or is it more the quality of bullet that makes it start to tumble after so long in flight, and therefore lose great amounts of velocity and fall short. 308WINs going subsonic causing instability/inaccuracy and barrel length being the culprit. The thread turned into long range ballistics, and. Thsi si a lead in from another thread - but this aside interested me - hopefully some of those people will follow and comment.
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