https://en.wikipedia.org/wiki/Mark_82_bomb
High drag dumb bombs. Mostly for low level high speed runs.
Also known as retarded bombs.High drag dumb bombs
Also known as retarded bombs.
Opposite of smart bombs.
Nyuk nyuk.
I am so waiting for the political correctness police to come out of the woodwork over the term "retarded". Hey, I still use it myself.
Retard....to slow down. As in an additave to paint to slow down cure time. They are in fact bombs with built-in retarders. Hence the can be called retarded bombs.I am so waiting for the political correctness police to come out of the woodwork over the term "retarded". Hey, I still use it myself.
Retard....to slow down. As in an additave to paint to slow down cure time. They are in fact bombs with built-in retarders. Hence the can be called retarded bombs.
The difficulty in this design is two fold. 1) They need to be robust enough to handle the deployment of the petals, so ideally that needs to happen as close to apogee as possible and 2) They need to be light.
The military version didn't have to fall slow, it just needed to fall slower than the standard version of the bomb. They were used in low level bombing in Vietnam where accuracy wasn't as important. The standard bombs blew up too close to the jet dropping them causing potential loss of flight control. By retarding the bombs with these petals the bombs hit the ground far enough behind the jet dropping them to mitigate them. Note, these petals make the bombs LESS accurate, but they were typically used in carpet bombing runs so a loss of accuracy was ok. When you see hollywood do this in movies, like Preditor Vs Alien: Requiem, it's typically done wrong and just because it looks cool.
It does, btw, look cool.
I solved the weight problem by making them with a rear electable motor pod that comes down via streamer. The rocket is then light enough that the resistance of the petals can slow it significantly. My 24mm version darn near floats down.
Like you, I came across this bomb design and thought "That's kewl! I should make that!" Then I searched the internet to see if someone HAD done it and found the old thread linked above. I don't possess the wood cutting ability the OP had in that thread, but I do own 3D printers, so I started experimenting using parts I designed and printed. I got the 18mm version working on my third prototype. Then I designed a 24mm version using mostly printed parts and submitted it to Apogee rockets hoping to make it a design of the month. They made it a feature article instead. Currently I am working on another 24mm version using Pringles cans as the main body tube, just because I like making Pringles versions of things.
18mm version on Thingiverse: https://www.thingiverse.com/thing:4847720
24mm version in issue 551 of Apogee's "Peak of Flight" newsletter: https://www.apogeerockets.com/education/downloads/Newsletter551.pdf
24mm version in flight:
24mm version on board video:
18mm version in flight:
24mm Pringles Prototype:
The pringle's version is too short and too heavy. It worked, but it fell faster than I'd like, so I'm going back (a little) to the drawing board on that one.
If anyone builds one whether my design or their own, be sure to post videos. This is an interesting design concept and challenge and they are some of the most interesting rockets to see in flight.
What good timing for you! My brother Perry (alslansmonkey in the forum) already designed a rocket for this that was featured in Apogee Rockets' Peak of Flight Newsletter.I saw this photo today and wondered what bombs these are? Looked like a neat scale model rocket design.
View attachment 475167
Sorry all. I didn't realize he'd already posted.
The difficulty in this design is two fold. 1) They need to be robust enough to handle the deployment of the petals, so ideally that needs to happen as close to apogee as possible and 2) They need to be light.
The military version didn't have to fall slow, it just needed to fall slower than the standard version of the bomb. They were used in low level bombing in Vietnam where accuracy wasn't as important. The standard bombs blew up too close to the jet dropping them causing potential loss of flight control. By retarding the bombs with these petals the bombs hit the ground far enough behind the jet dropping them to mitigate them. Note, these petals make the bombs LESS accurate, but they were typically used in carpet bombing runs so a loss of accuracy was ok. When you see hollywood do this in movies, like Preditor Vs Alien: Requiem, it's typically done wrong and just because it looks cool.
It does, btw, look cool.
I solved the weight problem by making them with a rear electable motor pod that comes down via streamer. The rocket is then light enough that the resistance of the petals can slow it significantly. My 24mm version darn near floats down.
Like you, I came across this bomb design and thought "That's kewl! I should make that!" Then I searched the internet to see if someone HAD done it and found the old thread linked above. I don't possess the wood cutting ability the OP had in that thread, but I do own 3D printers, so I started experimenting using parts I designed and printed. I got the 18mm version working on my third prototype. Then I designed a 24mm version using mostly printed parts and submitted it to Apogee rockets hoping to make it a design of the month. They made it a feature article instead. Currently I am working on another 24mm version using Pringles cans as the main body tube, just because I like making Pringles versions of things.
18mm version on Thingiverse: https://www.thingiverse.com/thing:4847720
24mm version in issue 551 of Apogee's "Peak of Flight" newsletter: https://www.apogeerockets.com/education/downloads/Newsletter551.pdf
24mm version in flight:
24mm version on board video:
18mm version in flight:
24mm Pringles Prototype:
The pringle's version is too short and too heavy. It worked, but it fell faster than I'd like, so I'm going back (a little) to the drawing board on that one.
If anyone builds one whether my design or their own, be sure to post videos. This is an interesting design concept and challenge and they are some of the most interesting rockets to see in flight.
Already has a name: Aero braking.Also, I realize it has other names, but I submit that this concept be known as a "hard parachute"
Yeah, and as an aeronautical engineer I approve of the proper name, but it's not as fun lolAlready has a name: Aero braking.
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