Thanks! I’m glad it was helpful. Part 2 is out as well. I was working on part 3 when the world went into the crapper. I will get back to it as soon as I can.

Well if you sat through the whole thing then you deserve a few hours break 🤣🤣. I’m glad I could help save you some time 👍

Thank you! I am hoping to get back to this project this winter and get the second video pulled together.

Thank you. I will try to get part 2 done later this fall once flying season winds down

dernodar glad it helped

revgro thx!

The structure was the easy part. The smoke and lighting have proven to be the real challenge.

Jeremy H thanks man! Still a work in progress

Dead Fish yes, me too.

Thx man! Yeah, I'm looking forward to that as well. I;m working through the hard part with the smoke and lighting now. Getting closer

Thanks!

Great! I’m glad the video helped. It’s a lot of fun but I wish I had more time to spend with it

Jody Spriggs thx man! That’s the plan. The knowledge series is all about that, knowledge. Brand agnostic, no hype

@@DefiantWings I'm waitiing for your project!!! My graduation thesis is this one so I look forward to part 2 3 and the end. Respect!!

@@tranminhtam3052 Thank you! once I get some time this fall I will get back to the project and the next video

吴斐 thank you! There are some links in the comments below that might help you. I hope to get part 2 done later this fall

I'm studying mechatronics and avionics; the mechanical aspects and the way they interact with our environment, this is what I am truly interested in. I have been taking ground and air courses as well, thank you.

Jarrod Ladd I glad that it helped you out. I hope to get back to the project and video this winter when I have more time

@@DefiantWings Looking forward to part 2 as well! I'm working on a similar project!

QuadMcFly the smoke system and lighting is proving to be more complex and problematic than the actual build.

@@DefiantWings I believe it! Fortunately for mine it's mostly for dynamic load testing of drone power systems, so I don't particularly need a smoke system. Curious what approach you're taking. I'm considering adding one. I've got some buddies who are super into vaping, and I think we can use a vape system and copper tubing to create the smoke points without disturbing the air too much. My biggest struggle right now is trying to figure out how to mount the load cell and motors without disrupting the air flow. I already have the logging system built and I've been using it for about 3 years now, so that part is no problem. Figuring out how to mount it though :O I need be able to consistently control the angle of attack as well, so it needs to be able to rotate the motor/prop assembly in relation to the air stream at specific repeatable angles. I have a few ideas. I'm thinking of using a vertical bar wrapped in a teardrop airfoil to prevent turbulence, and housing the load cell inside the tear drop. I can use a steel bar mount coming directly out from a slot in the airfoil. Then the bar inside the airfoil can rotate while the airfoil says consistently pointed into the airstream. I can probably 3D print the airfoil easily enough. This is a fun build. I'm looking to achieve air speeds of about 40m/s and I'll be using 4 miniquad motors in custom ducts for the powerplant, software speed control via UART. The whole system should be able to be completely automated. I'm hoping to use a high torque stepper motor to drive the rotation sequence as well to achieve the fixed angles.

Thx! Glad you found it useful

Thx man! Hoping to get some good data from this.

They get big fast. There is an awful lot tunnel for a little bit of test chamber...🤷‍♂️physics 🤣

onkar salavi thank you! Part to is in the works now. There will likely be a bart 3 well

I was only able to get about 15-20mph with the fan I used. It needed a more powerful blower.

I’m glad you liked it. I just used a 12v car radiator fan I found on Amazon. It’s no longer available but there should be others. What I found was that it didn’t supply a high flow rate or velocity when used in the tunnel. I think the highest speed I was able to get was 13mph. Fast enough for what I needed but I may upgrade to get more speed.

Theefun 400-Watt Portable... www.amazon.com/dp/B01MDNTD7A?ref=ppx_pop_mob_ap_share

I’m sure we could make that happen. I need to get it finished up this winter and then we can talk further

As long as it looks cool😎😜

@@DefiantWings yes, that is important lol

Here is a link to one of the documents that I used. I found it very helpful. www.intechopen.com/books/wind-tunnel-designs-and-their-diverse-engineering-applications/design-methodology-for-a-quick-and-low-cost-wind-tunnel

I have absolutely no idea 🤷‍♂️

It’s a 6:1 contraction in area. 12”x12”=144sqin x 6 = 864sqin. I used 30”x30” for the inlet wick gave me 900sqin.

@@DefiantWings oh, yes understood thanks for answering so quickly !

www.intechopen.com/books/wind-tunnel-designs-and-their-diverse-engineering-applications/design-methodology-for-a-quick-and-low-cost-wind-tunnel This is one of the documents that I used and the only one that I still have a link to. Its a pretty good writeup and should help you with the sizing. I am planning to spend some time on the wind tunnel this winter to try to develop an instrumentation package. I'm also looking at a higher capacity fan as well. Too may projects, so little time

@@DefiantWings thank you very much, finally a piece of literature that describes exact geometry after all the books I downloaded

Here is a link to one of the documents that I used. I found it very helpful. www.intechopen.com/books/wind-tunnel-designs-and-their-diverse-engineering-applications/design-methodology-for-a-quick-and-low-cost-wind-tunnel There is a lot of great information in here. You really want to start dimensioning the test chamber first based on the size of you test vehicle. All if the other components are based on the size of the test chamber. The document linked above has a lot of great info on the sizes

Probably not until later this fall. I have been so busy with wing development that I haven’t had a chance to finish the build video

I’m honestly afraid to add it all up haha. If I had to guess, I think I have about $600-$800 into it now. I have been doing a little bit at a time for a while so it doesn’t feel bad but I know it all adds up.

Annnd I've read that honeycomb is good for reducing lateral turbulence but screens are needed for longitudinal turbulence. (not sure what how they defined this, I'm assuming small pressure pulses are longitudinal turbulence) Something like window bug screen. This may be useful in the diffuser just before the fan. The primary paper I was reading was about closed loop tunnels so there were two corners and 3-4 diffusers between the test chamber and fan, so they used screens between the honeycomb and the contraction zone.(as I recall it was screen of 0.5mm wires and 80% holes by total area)

@@mytech6779 Here is a link to one of the documents that I used. I found it very helpful. www.intechopen.com/books/wind-tunnel-designs-and-their-diverse-engineering-applications/design-methodology-for-a-quick-and-low-cost-wind-tunnel I have window screen on either side of the straws/tubes. They help with the turbulence and hold the straws in place. win-win

The straws are stacked between pieces of screen. It holds them in place and helps cut the turbulence as well

@@DefiantWings What type of screen? A common exterior window screen?

Yep, it’s some fiberglass screen I had left over from a screen door repair. Nothing fancy 🤣

@@DefiantWings Thanks for the reply! I'm building a similar small-scale tunnel and my one concern is that the screen would unnecessarily decrease the velocity of the air entering the test section. However, the screen saves a lot of time and money over using spray adhesive to fix all the straws in place.

It was a compromise I was willing to make. A lot of the research I read said that screens were a part of the flow straitening process anyway.

MCRideout not bad. I’m working on part 2 now. Hope to have it ready in a couple of weeks.

The dimensions discussion is at 6:06 But the test chamber is 12”x12”x24”. The defuser is 12”x12” tapering to 16”x16” and is 38” long. The inlet is 30”x30” and tapers down to 12”x12” and it 42” long