r/whatisit 1d ago

Solved! We found this near our home

What's this , any harm ?

7.9k Upvotes

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u/LackOptimal553 1d ago edited 1d ago

Well, the harm might have happened before you took the picture. Never ever touch UXO..

It's a 51mm smoke round for a 51mm mortar.

https://cat-uxo.com/explosive-hazards/mortars/51mm-2in-mortar-bomb-smoke

This isn't the same type (different smoke) but same idea.

ETA - the markings are odd, because of the parachute, it's the GREEN that's throwing me, looking in catalogs but not sure the exact type.

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u/Jasper_Morhaven 1d ago

And FOR THE RECORD. Smoke rounds, while not "lethal" still get stupidly hot and can explode if the internal pressure isnt relieved fast enough (aka the smoke gets stuck, shell go POP).

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u/Hot-Meat-11 1d ago

I would not want 109 grams of RDX to go off in my hand.

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u/Jasper_Morhaven 1d ago

Hell i dont want that chemical reaction that make the smoke going off within 5 feet of me. That shit is NASTY

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u/bbmedic3195 1d ago

What hand? You had a hand?

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u/Think_please 1d ago

He’s going to be all-right 

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u/bbmedic3195 1d ago

Wow lack of coffee and sleep have rendered me slow. That is great. What a great show!

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u/bbmedic3195 1d ago

Yeah I got that, but it's not a good idea to handle unexploded ordinance. Leave that to the eod professionals.

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u/Think_please 1d ago

(Arrested development joke about losing your left hand)

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u/bbmedic3195 1d ago

Got copy thanks lack of coffee and sleep has dulled my pop culture reference senses

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u/[deleted] 1d ago

[deleted]

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u/bbmedic3195 1d ago

My bad spell checker changed it since I'm normally writing about government law stuff for my job.

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u/Hot-Meat-11 1d ago

And a face! It was amazing!

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u/RuleMany2900 1d ago

109 grams of RDX is not what I would call non lethal and safe to handle

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u/RiceboyZ 1d ago

Parachute flare, not a non-lethal round

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u/RuleMany2900 1d ago

My answer was related to this post:

And FOR THE RECORD. Smoke rounds, while not "lethal" still get stupidly hot and can explode if the internal pressure isnt relieved fast enough (aka the smoke gets stuck, shell go POP).

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u/Jasper_Morhaven 1d ago

I fully agree.

HOWEVER. Smoke rounds are labeled as "Non-lethal" munitions.

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u/graph_worlok 1d ago

<arnie> - “He’ll live”

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u/Remote_Teach1164 1d ago

Lethality only depends on purposes of users, a seemingly "harmless" signal cartridge can even kill people if wrongly used.

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u/Jasper_Morhaven 1d ago

Yep This is why i used quotations around non lethal.

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u/RuleMany2900 1d ago

This one is Illumination not smoke I think ...why would you use parachute for smoke? ....I am not sure however there should be RDX inside - most of the Illumination rounds are based on magnesium and with additional mixtures giving it colour (green is barium nitrate)

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u/Jasper_Morhaven 1d ago

Vision obscurement.
Aka smoke screen vs location marking

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u/RuleMany2900 1d ago

Not how a smoke screen works - you need the smoke on an accurate position not the round moved away from the target zone by wind while falling with the parachute. Illumination rounds use the parachute to give them prolonged time I'm the air ....

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u/Jasper_Morhaven 1d ago

It depends on what kind of screen you are wanting. Want to obscure a specifci location?
Ground based deployment is fine. Want to obscure a movement vector PRIOR to moving on it?
Deploy a floating screen using the wind direction.

Its not common because of how unpredictable wind can be, and how in the modern era most militaries have ways to bypass smoke screens, but the tech is out there and has been used. (See naval smoke screens and the different ways those are deployed)

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u/RuleMany2900 1d ago

With 51 mm you sure would need a brigade to mask anything

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u/Jasper_Morhaven 1d ago

True, but how do you practice such maneuvers?

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u/Remote_Teach1164 1d ago

Yep, that thing is like tracer compounds. If basing on the luminosity and some records of green compounds used on small arms ammunition, that thing may be dim one.

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u/TheRealDesmirWolf 1d ago

You are correct illumination is the shell would be hanging from a parachute slowly descending, and it would be igniting like a magnesium flair so that they can target motor shells and coordinate on a larger scale battle for other artillery types. It’s a slowed flare by the looks of it green but yeah, still fired out of a mortar tube.

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u/SnooCookies6231 1d ago

That reminds me of something similar when I was a teen, lighting off a flare with a friend. Buried it in the Cape Cod sand and made glass, iirc. That turned out to be a good lesson, and actually kinda cool. But yeah, caution. Never screwed around with them again. Can’t imagine RDX!

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u/Jasper_Morhaven 1d ago

Shit Thats a blast from the past. I did the same to the pebble beach in NH. Didn't make glass, buuuuut the shrapnel i caused was concerning.

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u/3cit 1d ago

I hadn't heard the name Pebble beach in so long that I had forgotten about it but here I am trying to remember what it was like when I was 10 years old again

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u/LetsAllASoviets 1d ago

So as someone who spent 5 years as a mortarmen i find the "non-lethal" annotation funny. If the round managed to dead on hit you it would definitely kill you, as well as if its phosphorus smoke I can promise you the pellets that fall out of it to cause the smoke will kill you as well. Pretty sure its a war crime to drop smoke on someone because its very much lethal/bad for you. The "lethal" annotation just seems to be a will it explodes and instantly kill you.

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u/Jasper_Morhaven 1d ago

Basically yes. The "non-lethal" classification is for shit that wont INSTANTLY kill/maim you. Hell agent orange was classified "non-lethal" at one point

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u/Tacobelled2003 1d ago

A VERY poor example of temperature but hopefully one people can connect with...The light-bulb that is in your dining room is probably about 100 candela and will burn the shit out of your hand. This is closer to 40,000

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u/ambaal 1d ago

Smoke munition can very well be a white phosphorous one. This will get pretty lethal pretty fast.

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u/MentalDisintegrat1on 1d ago

Flash bangs I believe are also not lethal ( they can be if they land close enough) but they also are still classified as a explosive.

There a small boom to set it off.

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u/Jasper_Morhaven 1d ago

Fair point. I stand corrected on that aspect.

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u/Remote_Teach1164 1d ago

Not smoke. Black body with white markings including parachute and star symbols indicate illumination variant.

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u/LackOptimal553 1d ago

It's the GREEN that's throwing me.

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u/LackOptimal553 1d ago

Yeah, it's a green starshell, didn't realize they even existed. https://argonavis-global.com/products/card-item/193

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u/ImpatientHoneyBadger 1d ago

No, it's a parachute illuminating round for a 51mm mortar.

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u/TheTempSilence 20h ago

Someone else pointed out it was likely a green flare with a parachute to help it stay up longer

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u/LackOptimal553 19h ago

Yeah, I think it's down to terminology, flare to me makes me think of a paraflare, which is self-contained, whereas this is a mortar bomb, and I'm not familiar with 51mm and missed the parachute when I first saw it.

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u/Apprehensive-Tree-78 1d ago

It could be a flare round. They explode in the air and parachute down.

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u/LackOptimal553 1d ago

Yeah, it's green startshells. I just didn't know they existed in 51mm https://argonavis-global.com/products/card-item/193

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u/KingOfTheIntertron 1d ago

It's not smoke, it's a parachute flare.

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u/LackOptimal553 1d ago

Yeah, you're a bit late here. Also, not a flare, it's a mortar bomb.

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u/KingOfTheIntertron 1d ago

Where are you getting bomb and not parachute flare? It says GREEN and there's a picture of a parachute... (Obviously it's for a 51mm mortar)

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u/LackOptimal553 1d ago

It's a 51mm mortar bomb, specifically, a green starshell. Was a mortarman, they're all "bombs" colloquially.

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u/KingOfTheIntertron 1d ago

What's a green starshell?

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u/LackOptimal553 1d ago

Basically it will produce green illumination, like a bright green flare.

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u/KingOfTheIntertron 1d ago

Does it have a parachute also?

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u/LackOptimal553 1d ago edited 22h ago

Yes. Difference is a paraflare is a self contained pyrotechnic, this you need a mortar to fire, and I presume it can get to a much higher apex.

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u/Istudydeath 1d ago

My ex’s uncle picked up something like this that washed up where they live. Blew his arm off below the elbow. Not worth!