Supersonic Aerodynamic Control

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“Supersonic aerodynamic control” is in no way the same thing as “terminal guidance” two dudes in the van out front of my house.

BPS: "The good news is we aren't doing any of that math today..." Me: " :( " BPS: "...That's the topic of the next video." ME: " :) "

Imagine the thickness of FBI's folder on this guy

13:07 cracked me up, i just wasn’t expecting that mouth movement

Whenever you say “ should I do a video on it“ no matter what it is I immediately want to see it

You could have convinced me the animation looking down along the airframe was real footage. Holy moly the little tabs work so well!

“And as always, they were mounted with about thirty pounds of hot glue” there is something profoundly wrong with this man and that is why i am subscribed to his channel

The neat thing about unplugging the servo on the first flight is it gave you a baseline for comparison and illustration of future flights.

JOEY B BACK WITH ANOTHER SLAMMER OF A VIDEO

Joey B out here controlling an aircraft over a WIDEEEEE envelope on his f̶i̶r̶s̶t̶ second try, and I hope ya'll know just how hard that is! Aircraft control derivatives scale with dynamic pressure (combo of airspeed and air density)... This basically means an aircraft behaves very differently at different speeds/altitudes with the same control deflection. The successful flight is a testament to Joe's math all collapsing down and "un-coupling" the rocket from its environment, from aero modeling to control system design to sensing. Next video is gonna be good! TL;DR: 😍🚀😍

When you started in on canards, I started muttering "elevons". When you started talking about talking about rotation the whole fin, I nearly yelled "elevons" at the TV as well as grumbling in 737 Max overcontrol. Then when you showed your solution, I was like, DUH, elevons. Yes, I know the shuttle used a separate rudder, but honestly you should be getting the point since you had four "wings" instead of two. This is how supersonic aircraft control their flight. And if you see my name and picture, and recognize them, LONG LIVE THE PID. Glad I found your channel, we did know each other. And to really induce swearing you need to botch a Kalman filter.

The simulations at the end are outstanding and it demonstrates how your channel not only inspires others to take on engineering projects, but perhaps even more importantly the channel builds a community of very talented aerospace engineers who come together and make meaningful contributions. Great job! Kudos to Gabriel, Matt, Andrew and Dan.

We leaving the ground with this one 🗣️🔥🔥🔥

My dad helped develop a few rockets for General Dynamics, they used something called “dithering” which made the fins vibrate(?) and when they wanted to steer in a particular direction they just made the fins spend more time on one side by interrupting the occultations, favoring the direction they wanted to go

It's fun seeing you go through the same problems I encountered about 15 yrs ago. I built a rocket with canard driven by high-powered rc servos. I put together a controller with an $1100 Analog Devices IMU and a custom microcontroller with SD card parameter control and data recording. I initially wanted to control roll. had 9 flights without success. At first I thought I had a control system bug, then I thought I might have a hardware problem. Finally I mechanically fixed the canard at a constant angle. I had roll reversal in every flight. I finally installed a camera to verify the data collection. Unfortunately the rocket came in ballistic and the 8 foot rocket was compressed into 8" long wad. I researched this problem and ran across a group in the NW that was having the same problem and had identified AIAA research that identified the problem many years ago.

Man, I'm an automation and Control engineer in Brazil, I have a masters degree in robótica and I have been teaching engineering and mechatronics for 8 years. I have no idea how on earth you deal with so many complex details in these projects. It seems like it is done for a team of 10 senior engineers. You are crazy! How do you tune the controllers before the launch? Do you have a detailed mathematical model for the whole structure? You are insane man, keep up with the work. You're going to heaven.

"I am not proud of everything I do." is my life motto.

There’s nothing better than trigonometry

The fins extra thickness didn't seem to be an issue, but if you do want to reduce there thickness in the future one option is to mount the servos inside the fuselage and have a thin shaft go up into the fin to control the tab. This could also allow almost all the cables to be inside the fuselage as well, further reducing drag.