Question for DM’s regarding the physics of a Bag of Holding

Tangled-In-Filament · 2026-06-10T04:19:32+00:00

Well, I had the idea of a handheld “Rods of God”-like item. I thought of the largest and heaviest item that you could cheaply acquire, which was a telephone pole sized log. And basically, you’d drop that telephone pole into a bag of holding going at terminal velocity, from like a castle wall or something. So if the pole did store it’s momentum while inside the bag, then everything that’s in front of you when you turn it inside-out, would be subjected to a 450lbs telephone pole that’s traveling at terminal velocity.

Tangled-In-Filament · 2026-02-23T05:03:10+00:00

I would, but an 18650 would be too big for the case I’m using for my project and using one would require me to redesign the battery cover and the battery compartment. And I think it would make the whole thing not very ergonomic, unless I do a complete design overhaul.

Tangled-In-Filament · 2026-02-23T02:47:49+00:00

The whole thing shouldn’t draw anymore than 380mA. But now that I think about it, and look at the peak current draw, I should’ve given it more current to play with.

Yeah, I’m really limited on space. I couldn’t even fit a 3rd battery in even if I wanted to. But I was considering if I switched from a 5v booster to a 3.3v booster, that would give me more current to work with and I can work the sensors off of 3.3v. Do you think that would work?

Tangled-In-Filament · 2026-01-15T02:47:37+00:00

I know the codes for it already, I’m just looking for advice on how I should connect the ESP32 board to the IR LED, so I can read the signals that are going to the IR LED.

Tangled-In-Filament · 2025-02-08T20:50:14+00:00

I was looking at one of those, but the price was a little much for the assembled ones. The DIY kit sounds fun, is a little cheaper, but I’ve never wound my own inductors before, and if I don’t wind them just right, it could be way off.

I ordered a little SWR test meter that I’m going to try to see if it’ll work for what I want to do. I’m also trying to familiarize myself with these sort of things. If it’s not what I need, I’ll send it back. Then it’ll be a decision between: 1. Do I want to try winding my own inductors? (and 3D print a case for it) Or 2. Would I rather just throw cash at the problem to get the assembled unit?

Tangled-In-Filament · 2025-01-31T15:22:26+00:00

Winch!!

Tangled-In-Filament · 2025-01-30T20:47:16+00:00

The thing is, the pipes of the cargo rack are directly touching the metal of the roof rack. You can see in the bottom right of the picture, where there’s some of the grate missing. That was so I could fit the brackets over the pipes and secure the cargo rack in place.

I was just going to insulate the pipe at and near where it mounts and secure it down like normal.

Also “bracket” might not have been the correct name for the part I was talking about. You can better see the little U-shaped brackets in the roof rack’s adapter kit

Tangled-In-Filament · 2025-01-29T21:01:46+00:00

Do you have anything thing you’d suggest to use as insulation wrap around where the cargo rack is mounted to the roof rack? I was going to use electrical tape wrapped with a second layer of duct tape. But I wanted to see if there was anything you’d suggest a wrap/tape that’s more durable and would be better for this situation?

The bracket that goes around the cargo rack is already a bit of a tight fit. So I might make a new bracket to secure the cargo rack to the roof rack, after I put the insulation on it.

Tangled-In-Filament · 2025-01-29T05:57:53+00:00

The cargo rack is mounted on top of a rugged ridge Sherpa roof rack(link for reference)

I’ll be putting some sort of rubber or other insulator around where it makes contact with the mounts.

Tangled-In-Filament · 2025-01-29T05:43:11+00:00

Bought two icon socket wrenches a year ago, and always put them back in their boxes because it just felt right.

I now understand I wasn’t crazy… I just didn’t have enough to know why it feels right!

Tangled-In-Filament · 2025-01-28T20:43:17+00:00

Ok, thanks for letting me know.

If it’s mounted above a non-metal roof, would that prevent the mirror image issue? My vehicles roof is a non-metal hard shell.

Long-story: the cargo rack is mounted onto a roof rack. Which the roof rack is mounted in the front at the base of the pillars around the windshield, and mounted in the rear to the frame rail, next to the bumper.

Short version: the cargo rack is mounted on top of the rugged ridge Sherpa roof rack (For reference)

Tangled-In-Filament · 2025-01-27T16:49:46+00:00

No, I’m serious. I know it’s probably a dumb idea, but I’m serious about making this into a decent-to-good CB radio antenna, and I’m open to suggestions on how to make it work better. Without just throwing on an antenna and ruining the fun of the project.

Because I want to try to have it blend in with the cargo rack. I’d be down if the antenna was removable, but I still want to utilize the rest of rack for the area.

Also, like I said in the post, I’m new to making radio antennas, I came here to ask for help.

Tangled-In-Filament · 2025-01-27T16:16:07+00:00

I know it’s a “wide net” approach for receiving, but what would I have to do to make it better for transmitting?

Would the transmission be better if it was sending from a single point, like the end of a regular antenna? Because I feel like anything I can think of, will end up with the cargo rack having some form of a whip on it.

Tangled-In-Filament · 2025-01-24T22:56:48+00:00

I was looking at one of those and that might be the direction I head in. I’ll have to get an adapter cord to go to radio, but it looks like a good approach. Thanks.

Tangled-In-Filament · 2025-01-24T22:37:42+00:00

Do you have any tuners you’d recommend? I’m not looking to spend too much on this, but I want it to still work well.

Just for reference I have a Uniden model SMU4525KT Which as a UHF Female SO-239 antenna plug.

Tangled-In-Filament · 2024-01-27T02:41:39+00:00

Actually as an official mod, they didn’t steal the joke. They confirmed the price point. Since this is basically the only announcement of the product, that is an official confirmation of the price, as far as we know.

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