| Last Hussar | 28 Mar 2020 1:44 p.m. PST |
Ever wanted to track a Sherman round in slo-mo? Of course you have. youtu.be/xpJ8EoGmLuE Also don't lay any bets on the Soviet 152mm v watermelons challenge. |
| 45thdiv | 28 Mar 2020 1:47 p.m. PST |
The slowmo guys have great stuff. |
 Yellow Admiral  | 28 Mar 2020 3:23 p.m. PST |
I bet WWII weapons developers would have sacrificed an eldest child to get test footage like this. The wobble in the 76mm round was unexpected. Did period ammo fired from period guns do that? - Ix |
| whitejamest | 28 Mar 2020 3:28 p.m. PST |
I'm impressed by the fact that 10 or so watermelons in a row manage to deflect the 152mm round from its course. Clearly there is a future in watermelon based tank armor. |
| Last Hussar | 28 Mar 2020 3:30 p.m. PST |
Obviously where the Wehrmacht went wrong. |
| Last Hussar | 28 Mar 2020 3:32 p.m. PST |
"Did period ammo fired from period guns do that?" I'm guessing so. Shows the advantage of rifling. They didn't comment on them all, but there appeared to be 3 shock waves |
| Stoppage | 28 Mar 2020 4:34 p.m. PST |
To be fair – the 152mm was firing a HEAT round – these are designed to act against solid armour plate – not soft-skinned water-melons. |
| Last Hussar | 28 Mar 2020 6:55 p.m. PST |
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| Blutarski | 28 Mar 2020 6:58 p.m. PST |
Is 12,000 fps the muzzle velocity or the frame rate? ;-) B |
| PzGeneral | 28 Mar 2020 8:51 p.m. PST |
My guess about the wobble was because the rifling in the barrel is worn out… |
| Thresher01 | 29 Mar 2020 1:07 a.m. PST |
Frames per second, since I don't think we had hypervelocity 76mm guns back then, or even now. Of course, I immediately thought feet per second too. Perhaps we should build one though, since think what a wallop that would pack, from a kinetic energy standpoint. ;-) |
| Gunfreak | 29 Mar 2020 2:46 a.m. PST |
How many watermelons do you need to protect against nukes? |
| Cerdic | 29 Mar 2020 3:09 a.m. PST |
Gunny, you idiot! You need honeydew melons for nukes… |
| Gunfreak | 29 Mar 2020 3:28 a.m. PST |
Ah, sorry I'm not a nuclear physicist/melon farmer. |
| Cerdic | 29 Mar 2020 7:43 a.m. PST |
Fair enough! The answer is 42, by the way… |
| d88mm1940 | 29 Mar 2020 8:27 a.m. PST |
I heard that you have to use seedless, 'cause the seeds can cause nasty wounds… |
| 14th NJ Vol | 29 Mar 2020 11:23 a.m. PST |
That wobble is worn out rifling. Only way to fix that is replace barrel or have that original barrel sleeved so it can be replaced at appropriate intervals. Any tankers here that served on tanks with rifled barrels? Im sure they can provide more details. I showed this video to an old M-48 tanker. Said that wobble definitely not what you want in your bullets , HEAT or Sabot. |
| Stoppage | 29 Mar 2020 11:58 a.m. PST |
Surely the wobble only happens initially – after exiting the muzzle? After a distance the round will lose a little velocity and the spin will settle it down into smooth flight. …until it loses more velocity and the spin no longer stabilises. Boat-tailed rounds usually land tail first at far distances. |
| Mobius | 30 Mar 2020 6:29 a.m. PST |
I've heard that rifled shells start out wobbling but settle down. But, I noticed there was some debris that seem to be coming out the barrel. Could the shell be paper patched so as not to wear out the barrel? |
| Last Hussar | 30 Mar 2020 9:09 a.m. PST |
Posted it somewhere else. Apparently that initial upward pitch is down to the forces acting on it as it leaves the muzzle (I'm not discounting the wear on a 75 year old barrel, btw). You'll notice how it corrected to a flat trajectory, which is due to the spin. An object lesson in "why did muskets form up in big blocks?" |
| Gunfreak | 30 Mar 2020 9:30 a.m. PST |
Why did riflemen forme up I'm big blocks?
The musket was more than accurate enough for the distances they were used. The ones holding them were not. |
| Stoppage | 30 Mar 2020 2:29 p.m. PST |
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does his research, selects his colors, and goes forth!
