RCTESTFLIGHT Propeller Design Competition Kickoff 

Wish you guys could do another collab. You both have wonderful minds. I had to dig to find the video you guys did.

Do you have a video explaining DOE? I’m struggling to understand how to set one up and execute to it.

​@@garybenninger1544whats the video? Had no idea they collabed

@@nateevink7237 nighthawkinlight has an incredible video on multivariate experimental design! (basically DOE i think)

使ったことはないけどタグチメソッドの可能性を感じますね

I don't know who prop-osed it, boat i'm a fan.

😂you must be new here!? He's a Savage!

Yeah, that took a pair 😂 It wasn't smooth water either!

He wouldn't risk it if he wasn't confident.

Should have used Minnie by Voyagesystems to save his laptop 😁

I forget the exact make & model but my uncle had a US brand car with a Mitsubishi motor which I was going to buy off him. Turned out that I would need to pull the motor just to change the spark plugs…lol.

@@tomchelle1That would almost certainly be a Dodge Stealth. They were basically the same car as the Mitsubishi GTO/3000GT, and had a transversally mounted V6 whose rear bank was so far into the engine bay/close to the firewall that the plugs were essentially impossible to remove without pulling the motor out of the car.

@@KaminKevCrew yep! Nailed it

Most engineers already do this stuff during school. You have to do a capstone project your senior year. Engineering students now have to cover more material in less time. School is just meant to be a foundation and you learn the rest on the job.

Actually thats how you get fired, a good engineer wouldnt have to waste so much with trial and error.. understand, design, verify....

more than 300😂😂😂

Factorial experiments not random OFAT. 😂

yeah way more than 300 he better get sponsored by matterhackers or something 😂😂

Maybe thats why PCB way is sponsoring, 300 prints for them is nothing

He already literal paddle prop adapter XD

We did this with the launcher mechanism in pinewood derby when I was younger. There was a single dowel rod in the middle of the track the would fold down and release the cars. We figured if your car passed all the length width and weight regulations but had a nose that was high up and just barely touched the tip of the dowel, your car would start moving immediately while all the other cars would only move when the dowel was all the way retracted. Optimized this design in following years with a similar high nose design but with a channel cut out of the length of the car that allowed the car to gain almost an entire car length head start on the other cars as soon as the dowel was retracted a tiny amount.

@@tmappe I guess that's clever, but in the lamest and most shameful way possible. Did you work for VW in emissions?

@@brianwelch1579 cry more because you didn’t think of it. We designed for the track. That’s what every racing team does in real life. Real life lessons learned during cub scouts make me more clever and smarter person today.

@@tmappe perioddddd. you slayed 😂😂

@@brianwelch1579 Racing is based on finding gaps in the rules to gain an advantage. If it's not in the rules, it's not cheating, and even then, it's almost encouraged to push the rules to their absolute limit to gain an advantage. Every professional racing series is like this.

So TPU might be fun to play with is what I'm hearing.

idea for a flexible thin nitinol version of that lexan prop! It would be super resistant to fatigue effects and flexible and able to flex in a similar way.

How do you get the thrust in newtons of a propellor, is this by doing prior testing and already having an understanding of the boats drag and knowing how much force is required at a given speed?

@@-B_S- Been a while since I watched this video so I don't remember what I was getting at with my comment. But, to answer your question, if you have a real propeller and boat, you can potentially measure the thrust with a load cell on the prop shaft. You can also measure the thrust by tying off the boat to a dock and measuring the tension on the line with a load cell. That may not be the same as the thrust while underway, though, so you have to be careful with that. That is called "bollard pull." If you are designing the boat, you can make predictions about how much power it needs based on rules of thumb or detailed study using computational fluid dynamics (cfd). If you have a hull, you can tow it and measure the tension in the tow line using a load cell. The rules of thumb are based on displacement of the boat and desired speed you want to achieve. So rctestflight could maybe just tow the hull at a few different speeds to establish a thrust vs speed curve, then for each prop he could estimate the actual thrust it is delivering based on speed. That will tell you how much thrust power has been delivered to the boat. Compare that with shaft power (torque x shaft speed) and you can get the prop efficiency. Or at least an estimate of it.

That would be cool, but it probably would not be printable (or atleast work well when printed)

Controllable pitch is being used to achieve higher power regeneration when sailing. This is where propellers need innovating.

I was thinking the same thing. Maybe even some kind of Auto feathering system that sets pitch automatically according to speed.

if you so smart and knowledge glutted why you don't submit your own "improved" design and let the numbers speak? Too afraid? ;)

@@guillermomarturetfendt9037 I hold 4 world records in aero. Yes - I'm to afraid.

​@@Rick_Cavallarohave you read jack Norris's book on propellers? It's hard to come by and is usually the expensive

@@terryboehler5752 I do. Jack sent me a copy of it when I was designing and building a wind powered vehicle that goes directly downwind faster than the wind. I was eager to make the most efficient propeller I could, and hoped he had some good secrets. My recollection is that the book had some good concepts and explanations, but overall it was kind of a mess. We ended up designing the propeller using JavaProp.

just looked it up - wow! very interesting!

dunno if you trolling but voltage dividers only go down not up, to go up you need an amp

Berlin?

Yes

@@TravlieGerman gang!

Me in Berlin rn...

Dieser Kommentar ist absofort deutsches Staatsgebiet

I saw a video by smarter everyday where he went to the coast guard and got to ride their new unique jet boat. It had multiple independently controlled movable jet engines which allowed them to conduct extremely unique movements in order to help with rescues and other stuff. It was the coolest most maneuverable boat I've ever seen

@@benmcreynolds8581 I'll have to watch it, thanks. My jet boat experience was 1972-ish. I'm 75 now.

@@WhatDadIsUpTo it's really cool to hear a little bit about your past experiences. I think you will enjoy the video and seeing what modern stuff they now use. I'm curious how drastically different things will be in certain areas. Mostly related to engineering capabilities

if you design it to wear slowly you can continue to be a software developer.. badum tsss!

A current transformer is even less accurate at low currents, a shunt is the best method here. Just need to choose a slightly higher shunt value or different amplifier for better data at low current. He could just replace the shunt resistor on the board he has with a better value, the math is literally just ohm's law.