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  #1  
Old 06-19-2019, 02:50 PM
nani140 nani140 is offline
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Join Date: Jun 2019
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Looking for freelancers

Hello all,

I am new to RF8 and I do not know how to use 3ds max. I am looking to get help in modelling our design. The configuration is a octarotor tailsitter, I will use Arduplane SITL to run the simulation on RF8.

I need a 3ds max file of our model which looks something like the attached design here. Please respond here and I can share more details of the design. Also, please feel free to quote charges for the work.

#In immediate need

Thanks a lot in advance
-Yeshwanth
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File Type: jpg Octahawk_ISO_1.jpg (332.8 KB, 13 views)
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  #2  
Old 06-20-2019, 08:57 AM
Flapper Flapper is offline
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If your goal is to use RF to test fly your design, you don't need to have a model created. There are two parts to aircraft design in RealFlight - the visual model (what you see on screen), which does require 3D modeling. But there is also the included "aircraft editor" where you input/adjust all the physical parameters, starting from a base visual model of something that is sort of close to your design. You can add/subtract/resize/reshape motors, wings, booms, fuselages, airfoils or anything else as desired - the end result is a model that mimics the flight of the intended design very closely. Within the editor, you can see all the items you added/subtracted/changed. The catch is - when you go to fly it, it will still look like the base model you started with - but it will behave much differently.
I use it frequently to prototype an existing "real" model, and then interactively make changes until the one in RF flies the way I want. Then I go to the real model, and make the changes to that - and they bear out the flight behavior that was predicted.
There is a learning curve to using the editor, and some of the parameters can get pretty esoteric about what they do - but it is all there, and there is a lot of help here if there are further questions!
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  #3  
Old 06-20-2019, 10:30 AM
nani140 nani140 is offline
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Hi @Flapper,

Thanks for the detailed suggestion. I tried to edit an existing model to get something close to what I'm thinking.

I think RF8 cannot inherently fly such a model, so I connected it with Ardupilot SITL with Mission Planner. However, I'm unable to get it off the ground (the airfract gets toppled)

Can you please help check if I have done anything wrong here. I'm attaching the RFX file here.
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File Type: rfx Quad Tailsitter_V1_EA.RFX (982.6 KB, 5 views)
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  #4  
Old 06-20-2019, 11:43 PM
Flapper Flapper is offline
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I didn't look for the original, to compare modifications. But you have deleted one of the sets of wings when I compare the physics wireframe to the "ghost" visual image. So two of the engines are offset a long ways from the remaining wing, giving asymmetrical trust. Hence the toppling.

Spend some time looking at a variety of models - both plane and multi-rotor, to get a sense of how the various parts are configured, how the coordinate system works, etc. In looking at the jpg, RealFlight shouldn't have any issue inherently flying such a model for very basic testing, although Ardu and MP would enhance the control a lot.

Start with a very basic quad, and do some uncomplicated modifications - turn it into an octo-copter, etc. (or vice versa). Look at some planes with multiple sections of wings set at different dihedrals to get a sense of how they were made and positioned. It will take time "playing" with it to get an overall sense of how to make the appropriate physics wireframes.
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