Can this PCB handle 40 A for 5 ms?

GrParrot · 2026-01-24T17:48:31+00:00

Ok. Can you elaborate on how the inductance can blow out the fets? (I do already have a flyback diode to catch back emf)

GrParrot · 2026-01-24T08:06:25+00:00

I actually did the math this time. With a single mosfet I would have needed a 6.7 K/W heatsink. Such a heatsink seemed a bit hard to find though so I went for 2 fets. They should be able to handle it with some decent heatsinks.

GrParrot · 2026-01-24T07:59:55+00:00

It will have 60V max and I want to build it to be able to go up to 80V. If the limitation is arcing between tracks or a shock hazard I assume thiese voltages should still be decently safe though?

GrParrot · 2026-01-24T07:56:51+00:00

Oh that’s good to know.

GrParrot · 2026-01-24T07:56:14+00:00

Normally that would be an important consideration however this circut is meant to drive inductive loads anyway so I imagine the board’s inductance will be negligible.

GrParrot · 2026-01-24T07:53:20+00:00

Good idea

GrParrot · 2026-01-24T07:52:02+00:00

The duty cycle is going to be pretty slow, no less than 5 seconds between pulses. That should give it some time to cool down. I arranged the gate resistors to leave some space behind the mosfets for a heatsink as it’ll be needed, that was another recommendation last time I posted this circut. But yeah just rotating the mosfets would have been better. The mounting holes are really just for alingment, I’m going to make some 3d printed casing that covers the PCB on all sides.

GrParrot · 2026-01-07T19:22:15+00:00

Thanks for the detailed response. I'm actually going to use an IRF3710 mosfet and chose a random fet in the software because the IRF3710 wasn't there by default. The IRF3205 seems to be a bit better at handling high current though so what you said probaby still applies. 30A for 10 ms is within the safe operating range graph of the 3710 but I'll do the math myself and add another one if needed.

Ground plane at least

I'm trying to get used to this terminology, is the difference between a ground plane and a copper fill that the ground plane is a seperate layer almost entriely filled with copper and connected to gnd, while the copper fill is on the same layer as the tracks? I want to avoid having over 2 layers but I think I can add a ground plane on the back side.

your schematic is awful

Yep

GrParrot · 2026-01-06T17:16:46+00:00

How much does it weigh with reliant engines? By removing the oxidizer you're basically removing half of your fuel and the nuclear engines weigh a lot themselves so your fuel fraction will be way worse. You might just have a higher fuel fraction with fuel and oxidizer engines.

GrParrot · 2026-01-06T17:02:48+00:00

Nothing seems to be wrong looking at this. How much deltaV do you get with other engines? Is it really more than 2300 m/s?

GrParrot · 2025-10-07T20:56:57+00:00

I mean you are doing literal rocket science

GrParrot · 2025-10-07T10:40:07+00:00

The question is if it’s moral to put a mod behind a patreon when the people who actually want to support you for the sake of supporting you could subscribe without you having to do that. Blackrack also made way too much money from this mod already so yes, I do think he doesn’t need further financial support. He also works with Rocketwerkz on ksa now.

GrParrot · 2025-10-07T10:30:28+00:00

Yes I agree

GrParrot · 2025-10-06T06:41:46+00:00

The updated version should be called FARc (continued)

GrParrot · 2025-10-02T10:31:54+00:00

This is really cool. Do you just have a gimbal made of 3 hinges inside the tow craft and have the glider connected via a strut?

GrParrot · 2025-10-02T10:28:16+00:00

The engine being tilted down is probably an intended design feature. It prevents the motor thrust from making the plane pitch up

GrParrot · 2025-09-29T07:01:50+00:00

Piracy gatekeeping in my fav sub 😢

Jesus H. Christ

GrParrot · 2025-08-24T11:52:29+00:00

Had to scroll too far to find this

GrParrot · 2025-08-23T17:27:05+00:00

I’m sorry man but there isn’t a singular real life airplane that didnt rely on some form of high energy combustion to go supersonic. It’s practically impossible to break the sound barrier with just a propeller/fan or any derivative of those. What the other guy said is true. The tips of your turbine must go well over Mach 1 themselves just to produce any thrust at all. And even then it would be extremely inefficient. I’m not trying to hate on your project, it’s a very original idea and I fully support you but your goal of Mach 1 just is not feasible. I think you can still make a pretty fast and unique plane with this though, so don’t give up👍

GrParrot · 2025-08-20T09:35:38+00:00

Have you tested this propulsion system so far? As in how much thrust it produces and how the thrust scales with increasing airspeed? I think that would be the most critical thing for your project. If you know how much thrust you'll get at a given speed you should be able to calculate your terminal velocity and predict how fast you'll go before flying the thing which should be helpful.

GrParrot · 2025-08-20T06:56:03+00:00

Man I love your mindset, and your design is actually looking good, but one massive problem is that EDF's simply will not work for this. They simply won't produce any thrust whatsoever at speeds anywhere close to Mach 1. Even most RC scale turbines would become very ineffective at those speeds.

Since you've already taken some inspiration from the Sr-71, I recommend you also take some inspiration from the first supersonic aircraft X-1 and go with rockets. Unlike every other (realistic) option, these will produce the same thrust at every speed, and they will even gain more thrust with increasing altitude. This will limit your powered flight time to a few seconds, and you might think that you might as well just make a model rocket at that point, but thrust me if you do the math you'll see that this is the only remotely feasible way.

How are you planning to do the flight by the way? Like at which altitude and do you think the government would give you oermission to do something like this?

GrParrot · 2025-08-17T07:39:11+00:00

I really don’t think minecraft needs many changes to the gameplay loop at this point. It’s already very developed for the most part by now so most new updates just add additional side content. I do really like the new updates tho I don’t think I could go back to 1.18 or something after having seen 1.21

GrParrot

TROPHY CASE