--- Log opened Thu Jan 09 00:00:43 2025
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08:14 < hprmbridge> alonzoc> saxo: iirc the toroidal prop doesn't actually make less noise it just makes more noise in the lower frequencies which means humans feel it's less noise. I don't think it actually decreases acoustic losses
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09:24 < nsh> aye, that tracks with the greater equidistribution of the vortices 
09:25 < nsh> the modes will be lower in frequency
09:26 < nsh> it's not a zero sum game though ofc
09:26 < nsh> a bird is producing the same lift with significantly less acoustic loss
09:27 < nsh> but they're not using entirely rotational motion 
09:27 < nsh> (and a lot of other things that make a difference)
09:28 < nsh> the question is how can you minimise the transduction of energy through turbulent regimes of the flow 
09:29 < nsh> constrained to: it's very convenient for us to produce high very localised axial torques
09:32 < hprmbridge> alonzoc> I had some thoughts a while ago on ducted drone with a big contrarotating prop and some gyros + thrust vectoring. With a curved top you can get a much bigger effective intake than the opening size alone
09:32 < hprmbridge> alonzoc> the lack of an exposed prop also contributes to safety etc
09:33 < hprmbridge> alonzoc> not an original idea tho apparently https://cleorobotics.com/product/ (these guys beat me to it)
09:35 < hprmbridge> alonzoc> I wonder how good those "fanless" dyson fans are in the thrust regime required for a drone
09:36 < hprmbridge> alonzoc> I haven't actually looked at them besides hearing someone say their efficiency gets abismal as you increase the opening size but drones are small
09:48 < kanzure> https://github.com/piebro/factorio-blueprint-visualizer
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10:42 < AlonzoC> looks like my IRC client is working again woo
10:56 < fenn> https://en.wikipedia.org/wiki/Rim-driven_thruster could be adapted to aerial drone use
10:58 < AlonzoC> would defo help with a ducted drone with a single central fan, don't have wires, the motor, and supports in the way of airflow.
10:58 < AlonzoC> Motor is also further out of harms way
11:00 < fenn> overall it's probably more fragile since the motor is large and thin
11:01 < fenn> it could be driven by a ring gear on the outer edge i suppose
11:01 < AlonzoC> Yeah, maybe you could have the blades setup such that they'd break before any force pushing down on them would damage the ring
11:02 < fenn> i kind of have a thing for large diameter direct drive motors
11:02 < AlonzoC> The centripedal force on the blades would be orthoganal to the direction of force you want the blades to be weak to
11:02 < AlonzoC> well they are kinda neat
11:03 < fenn> linear motors too
11:03 < fenn> also galvos and voice coils. eh
11:04  * fenn watches https://www.youtube.com/watch?v=_S0TzCM9mFs
11:04 < fenn> .t
11:04 < fenn> oh, right
11:04 < saxo> Sorry, t took too long
11:05 < fenn> laser etching 3d prints with a galvo 2W IR laser
11:05 < AlonzoC> Seen those lasers big cousin strip rust of metal in person. scary bet awesome
11:05 < AlonzoC> s/bet/but/
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12:37 < hprmbridge> nmz787> fenn are you seeing the "donut" ev motors that were shown at CES this week?
12:37 < hprmbridge> nmz787> I'm wondering if that's what lead you to the rim-driven ship thing
12:51 < hprmbridge> nmz787> apparently folks are complaining about the donut motors on reddit re unsprung mass
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12:59 < fenn> no, there was some random guy on irc asking if anyone had ever made variable pitch rim driven thrusters
12:59 < fenn> maybe that's what inspired him though
13:01 < fenn> it kinda makes no sense for a car wheel because you want as little unsprung mass as possible for good traction and maintaining contact with the ground
13:01 < fenn> it could simplify the design a lot, but as always there's a tradeoff
13:02 < hprmbridge> nmz787> I thought unsprung mass would just make an uncomfortable ride
13:02 < hprmbridge> nmz787> and harsh on the unsprung stuff too
13:04 < L29Ah> .t https://www.youtube.com/watch?v=u2cETOyuJ20
13:04 < saxo> Sorry, t took too long
13:04 < fenn> say you run over a big rock, we're watching the wheel in slow motion. it rolls off the rock, now the wheel is in mid-air, being accelerated downard by the force of the spring. the heavier the wheel is, the slower it accelerates and the longer it takes to hit the ground and start doing useful wheel stuff again
13:05 < hprmbridge> nmz787> hmm
13:05 < L29Ah> nmz787: i increased my bicycle unsprung mass from 13 to 26kg and now it's much less controllable on uneven road
13:05 < L29Ah> since i can't press it into the road hard enough after it jumps on an obstacle
13:07 < L29Ah> now just gotta be ready for the upcoming uncontrollable flight after hitting a speed bump or such
13:07 < fenn> this donut motor has interesting scaling... 10x the power for 2.6x the weight, 4x the power for 2x the weight http://newatlas-brightspot.s3.amazonaws.com/8c/b8/b7340f734ac497f8d743b485e9d2/techspecs.png
13:07 < hprmbridge> nmz787> I've been looking at hacking EV fast charging port to sink power out instead of charge the battery
13:08 < fenn> that used to be a standard feature
13:08 < fenn> sounds potentially dangerous
13:08 < L29Ah> .t https://www.youtube.com/watch?v=u2cETOyuJ20
13:08 < saxo> - YouTube
13:09  * L29Ah slaps saxo
13:09 < fenn> blame google
13:09 < hprmbridge> nmz787> https://openinverter.org/wiki/Bidirectional_Charging
13:09 < L29Ah> ^ "Thrust vectoring drone"
13:09 < fenn> grepping for <title> still works *shrug*
13:09 < hprmbridge> nmz787> it was a standard on the ChDeMo or whatever the Japanese Nissan Leaf used
13:11 < fenn> heh that acronym works better in japanese
13:12 < fenn> "CHA deMO ikaga desuka" (お茶でもいかがですか), translating to English as "How about a cup of tea?", referring to the time it would take to charge a car.
13:14 < hprmbridge> nmz787> huh
13:14 < hprmbridge> nmz787> neat
13:17 < L29Ah> o-cha
13:19 < fenn> just a politeness modifier
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13:46 < AlonzoC> what's going on with saxo today lol
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14:11 < hprmbridge> kanzure> brain surgery
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14:32 < nsh> it's youtube being difficult
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14:32 < nsh> https://www.youtube.com/watch?v=u2cETOyuJ20
14:32 < ipassbutt{r}> Thrust vectoring drone
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18:39 < hprmbridge> kanzure> deepseek v3 on CPU only https://x.com/nisten/status/1877276141905387565
18:44 < fenn> that's the only way to run it because nobody's got 400GB of VRAM
18:45 < fenn> hopefully somebody will distill it down to a more reasonable size
18:46 < fenn> 12 tokens per second is actually a very good and usable speed
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--- Log closed Fri Jan 10 00:00:44 2025