Holbrook Aerospace

"Median rule", maximum cool. Behold: the drag polar that’s raising the bar (or should we say lowering the drag)! ??? This curve isn’t just smooth—it’s an optimization goldmine. With the area under the curve as a key criterion, we’re not just plotting; we are squaring the circle (or polar) on how to create more impactful, and more fruitful optimization parameters . Because when it comes to efficiency, every square inch counts. Thoughts? Questions? Let’s keep the discussion uplifting! ?? #DataMeetsDesign #AerodynamicsInAction #LetsLiftSpirits"

First print came out really well. This is direct off the printer (QIDI Technology co., ltd. Xmax 3). It's actually printed in high temp ASA. Really strong and light. The model could use some tweaking though!

Now that the HAVF Profile tool is live, I've been using it to stress what I can possibly achieve with it in Onshape by PTC. Wow! 385 features and the part is still easy to work on. A part this complex is not always easy to make in Solidworks, just because a lot of the tools like the split feature are really bad at consistently deleting the intended geometry on rebuild. It's nice not to have to work around that. This design has about 2 dozen split features and I haven't had a problem with one. Now, what material should I print this in first?

With the live stream today, I almost forgot to post this. But it's a crucial part of what we went over today. The HAVF format is open, and it's mechanics are not hidden. Anyone can now create any airfoil they wish and use it within the feature released on Onshape. It's the last crucial part to enable creators with the full power they need to more easily render what exists in their minds eye into solid, discrete CAD geometry. These tools make it easier than ever to create high quality aero models. https://lnkd.in/essGJ__y

If you aren't designing your aero projects with vectors, then what are you doing?!? I was able to design these in half the time it would have normally taken, because I was using HAVF vectors, which completely rebuilt the models while I adjusted them to my hearts content. Have a non-symmetric propeller with 5 unique blades that needs to be perfectly balanced? Adjusting planform for balance is quick and easy, without impacting the airfoil, trailing edge, or even hub geometry! I was able to design these tessellated propellers also, a new concept I've been pondering. Unlike toroidal propellers that connect two blade tips, tessellated propellers form a complete circuit of geometry around the hub by using special blade designs that perfectly intersect and connect like pieces of clockwork. Most of these blades were just drawn up for fun, and the purpose of testing the motor curve for the DJI Avata. But, because the models are parametric blade models using HAVF airfoil formats, the models I've made are actually very useful templates for any blade I'd want to make. What ideas are in your head, that you aren't modeling because it takes too long? Register here for my live stream with Onshape by PTC, Formlabs, and RCTestFlight next week, to learn what's possible with HAVF, and our new airfoil feature on Onshape. https://lnkd.in/exwmkk9S For anyone that wants to get a head start on the live stream, feel free to use code (IWTBRB) to get 15% off the complete HAVF airfoil vector library, found here ( https://lnkd.in/eGyCdh5H ).

Hot of the press!

Speed modeling an F1 Front Wing in Onshape, a PTC Technology! Here am I using the recently released HAVF profile tool to quickly create an F1 wing. Because of the ability to make an airfoil along any line, its possible to create perfect spacing between airfoils, just like you'd want on an F1 wing, all without fiddling with chord values or angles! What's more the four part wing is completely parametric, so you not only can draw it quickly, but it is practically instantly adjustable when compared with a model defined by explicit chord angles. The main airfoil that I used was an sg6043, which I got from browsing my book for airfoils that had 5% camber. The book provides a great way to quickly sort through specific groups of airfoils. The stock feature comes with many airfoils as well, which when used with the "profile thickness" adjustment within the feature, made it ultra-quick to scale NACA 0012 airfoils to fit on the narrow bottom surface of the wiglets. All told it took about an hour to model this. It can certainly be done more quickly. But, this was my first try. I think most of the time could be saved around modeling the trailing edge guidelines. Either by simplifying them by sweeping the root trailing edge line, or starting with the final method of guide points for 3D fit splines sooner. Use code f1 to get a 20% discount on my book this week! Or, better yet, share this post and get a 50% discount on my book. https://lnkd.in/eh5UbRtG

Here are two of the exact same blades from gen1760 of my optimization for the RCTF design competition. One in Onshape, a PTC Technology and one in SOLIDWORKS. The blades are not step files designed in on program, and import into another. The quintuple profile blades are completely defined in CAD by a 1.8 kilobyte text file using the HAVF airfoil format. What is the size of the text file for the ClarkY on airfoiltools.com? 2.6 kilobytes. Now, both software have their pros and cons, but for future clients, being able to work on the exact model simultaneously certainly seems like it's going to be the way to go.

Well, I timed the same operation in Onshape, a PTC Technology as SOLIDWORKS; replacing five HAVF airfoils in a propeller blade from a newer generation in my blade optimization software. The time in Solidworks was 1:49. The time in Onshape is 1:10. That's almost 50 seconds faster, or about twice as fast! So, thank you for the saved time Greg Brown. Stay tuned as I compare the finished models from both software, with updated chords and AOA. The sly among you may realize that these airfoils I am replacing are not from my book. Then where are they from?! To learn more about Holbrook Aerospace is using the HAVF format to simultaneously optimize blades, and all their airfoil sections simultaneously, you can message us, buy our book, or stay tuned for further updates! Optimizing and designing using HAVF doesn't just empower your optimizations, it also makes modeling and prototyping a faster, and more effortless process. Is it compatible with your design software? If it's not already, it will be soon!

Well, I timed the same operation in Onshape, a PTC Technology as SOLIDWORKS; replacing five HAVF airfoils in a propeller blade from a newer generation in my blade optimization software. The time in Solidworks was 1:49. The time in Onshape is 1:10. That's almost 50 seconds faster, or about twice as fast! So, thank you for the saved time Greg Brown. Stay tuned as I compare the finished models from both software, with updated chords and AOA. The sly among you may realize that these airfoils I am replacing are not from my book. Then where are they from?! To learn more about Holbrook Aerospace is using the HAVF format to simultaneously optimize blades, and all their airfoil sections simultaneously, you can message us, buy our book, or stay tuned for further updates! Optimizing and designing using HAVF doesn't just empower your optimizations, it also makes modeling and prototyping a faster, and more effortless process. Is it compatible with your design software? If it's not already, it will be soon!