STREAMLINE
Hardware- 6 Devlogs
- 103 Total hours
Body & frame
In this time period the overall assembly of the frame and body and the mechanisms which will hold all the body together and will last all most 2G’s during flight
and make sure that nothing get dismantled at 300km/h (unlike Boeing) and also make sure that the frame is tough enough to withstand high tension and gravitational forces and not snap under it and also making sure that everything can fit properly with leaving some room for some wiggle and in this process i had to change the battery that i aimed to use, to fit it inside drone and made a decision to not remake the drone itself again
that’s all folks!
can’t belive that this is my shortest devlog , geez i need to work more efficiently….
Tools used
-fusion 360
Main body design
So the wing is now designed from the NACA 0016 airfoil but there one problem , how do we know that we are getting the require drag and lift ?? , the answer is simple just put your airfoil model into simscale and use C(D) vs C(L) graph from your cfd post process result , okay now we have our data after 10 Mins of simulation , but oh its is newtons… now we will use the equation that every engineers use this formula
Force(Newtons) = C(D) * 1/2 * p * V^2 * A
Notations
- C(D) = coefficient of drag
- p = density of air
- V = velocity
-A = area
so after some mind soaring calculations you get 24.82 Grams of drag per wing yeppe , congratulations ! you have successfully got a low drag and zero lift wing !!
apart from all of this accurate and precise modeling is done for low error model , just joining the wings to the core testing a locking mechanism making few adjustments in models and making the model aerodynamic
that’s it for this devlog folks nothing more !
sources used :
Simscale - CFD - Incompressible , V : 88.3 m/s
New mounting & aero designs
Well i looked at some designs of the worlds fastest fpv pod drone from youtube of world record holders in search of proper tested ideas and mounting hole positioning this helps in saving time and money while the design of the drones is not copied the core idea and the mistakes of the record holders drones are kept in mind to avoid any costly mistakes , while this method cant guarantee 100% perfection of the entire assembely or the design there can always be room for mistakes despite trying to avoid it
Now for the new elements the issue with the PDB mounting holes have bought me to a conclusion to change the distance between the mounting holes and match it to the FC so a single big hole can be used for all purpose avoiding any poor mounting or adding additional weight just to support any additional unnecessary supports for the holes
talking about supports the supports between the holes and the walls are now webbed with thickness of 1mm with multiple walls to make it stiff enough for high G forces , making it a better design choice for mounting and stiffness
about the new addition the previous design of the wing is now changed to a proper NACA airfoil to avoid excess drag and no lift to avoid instability at high speed during maneuvering
Details :
Videos taken inspiration from
-Airfoil details
attached in images
-Website -
http://www.windandwet.com/windturbine/airfoil_plotter/index.php
Components placements , Frame & CFD
for the new Drone design the placements and the frame of the components matters a lot because its helps in reducing weight and keeping it balanced through constant speed and also not concentrate all the weight on a specific point (weight distribution), to model the frame correctly i needed to be sure that the prototype Aerodynamics are correct and balanced without causing to much drag on the cone and on the wings thanks to the water droplet body and the aerofoil wings the drag was significantly less and the main points causing the drag where the points at which the air and the body would first impact and the drag caused by it was mostly negligible allowing the drone to fly at its true capacity rather than being a literal flying brick
Software used
- fusion 360 (modeling/CAD)
- Simscale (CFD analysis , Incompressible fluid (air) )
Reading used
- speed / velocity inlet - 83.33m/s
- pressure outlet - 0 / constant
- walls of the simulation box , Slip walls settings used
New concept for streamline! - Due to my new simulation of the drone flaring and doing some analysis i found out that the flaring provides little to no aerodynamic advantage and instead adds up more weight to the drone , simply said the new analysis showed that a classic fpv drone wont bring up the aerodynamic advantage i am looking for instead a pod drone with a uni-body with integrated chassis would be better for speed and aerodynamics i used NASA Airfoil sim to simulate the NACA wing profile And applied specific Camber angles (0.3 Degrees) which almost eliminates most of the drag on the wing while the current stage of the drone in prototype and mockups
Software’s / services used
- Fusion 360
- Simscale
- NASA Airfoil Sim (student)
- Airfoil plotter
- Airfoil DAT to Spline ( or any other fusion 360 Plugin for the conversion of CSV file to spline for accurate Airfoil Profile)
Although i wasted a ton of time on the classic but atleast i got to learn more complex modeling such as T-spline and Surface modeling for such surfaces .
I am currently not using ansys because using ansys for small task is a waste of time and also my ansys is kind of having a crack down idk why
