Help - Designing Flying Wing Fuselage

[RJMathiyazhagan]

Hi there,

I'm working on a flying wing fuselage with a pusher motor mount. I managed to create the fuselage, but I'm stuck on the motor mount.

Can anyone please help me with this? I've attached my work file and a reference image. I would really appreciate your assistance.

Thanks a lot.

Reference imagereference imageMy design

[g-andresen]

Hi,

I think that  @wersy can say something about this.

günther

[wersy]

Before you continue working on it, you should first think about the proportions. The fuselage is far too long in relation to the root profile. Use your example as a guide.

In addition, the wing profile is not suitable for a flying wing, the plane would fly downwards.
The fuselage should be more neutral, i.e. have a symmetrical profile.

For the motor mount, you need to consider whether the motor should be on the inside or outside and how the motor should be mounted.

According to the dimensions, this should be a huge plane.
For a project like this you should consult a very experienced designer.

[TrippyLighting]

---

@wersy wrote:

For a project like this you should consult a very experienced designer.

---

I can offer the necessary surface modeling skills... 

[RJMathiyazhagan]

Thank you so much for your reply.

I appreciate your points and I agree with them.

I am still working on the conceptual design and I have not decided on the airfoil yet. I am testing different reflexed airfoils with simulations.

Before I finalize the design, I want to make sure that I can model the plane for 3D printing. That's why I am experimenting with various dimensions and airfoils to find the best fit for my needs.

The original model that I am working on is very small, with a maximum take-off weight of no more than 3 kg.

I want to learn how to model the integrated motor mount so that I can apply it to the real model.

Thank you for your help and guidance.

[RJMathiyazhagan]

I am very pleased to hear that. Could you please tell me more about that.

[wersy]

---

@TrippyLighting  schrieb:

---

@wersy wrote:

For a project like this you should consult a very experienced designer.

---

I can offer the necessary surface modeling skills... 

---

As to surface modeling I have learned a lot from you.
As to a "very experienced designer" I meant an aerodynamicist. I am in the fortunate position of having two of them - one is a flight captain 🙂

[TrippyLighting]

---

@wersy wrote:

---

@TrippyLighting  schrieb:

---

@wersy wrote:

For a project like this you should consult a very experienced designer.

---

I can offer the necessary surface modeling skills... 

---

As to surface modeling I have learned a lot from you.
As to a "very experienced designer" I meant an aerodynamicist.

🙂

---

Yep, that's what I assumed 😉

[wersy]

---

@TrippyLighting  schrieb:

---

@wersy wrote:

---

@TrippyLighting  schrieb:

---

@wersy wrote:

For a project like this you should consult a very experienced designer.

---

I can offer the necessary surface modeling skills... 

---

As to surface modeling I have learned a lot from you.
As to a "very experienced designer" I meant an aerodynamicist.

🙂

---

Yep, that's what I assumed 😉

---

Oh great, I didn't know you knew about aerodynamics.
Do you use programs for optimal lift distribution and all that stuff?

[TrippyLighting]

---

@wersy wrote:

---

@TrippyLighting  schrieb:

---

@wersy wrote:

---

@TrippyLighting  schrieb:

---

@wersy wrote:

For a project like this you should consult a very experienced designer.

---

I can offer the necessary surface modeling skills... 

---

As to surface modeling I have learned a lot from you.
As to a "very experienced designer" I meant an aerodynamicist.

🙂

---

Yep, that's what I assumed 😉

---

Oh great, I didn't know you knew about aerodynamics.
Do you use programs for optimal lift distribution and all that stuff?

---

I don't know a thing about aerodynamics. That's why I stated that I can supply the necessary surface modeling expertise 😉

[wersy]

---

@TrippyLighting  schrieb:

---

I don't know a thing about aerodynamics.

---

Oh what a pity, then I misinterpreted your answer.

[wersy]

---

@RJMathiyazhagan  schrieb:
Before I finalize the design, I want to make sure that I can model the plane for 3D printing. That's why I am experimenting with various dimensions and airfoils to find the best fit for my needs.

---

In this case, you should upload the model in the size you actually want to print it. It makes no sense to make a suggestion for a motor mount with a diameter of 80 mm. I don't know a motor that big.
Besides, the motor mount is the smallest problem of all.

To find out if the parts are printable, you have to split the model. That's always the first thing I do. A floor plan is completely enough for this.
Next, you need to know in which position the parts need to be printed. You also need to take into account how the parts will be joined form-fit.

Once all this has been clarified, I have aerodynamic calculations done to find the optimum wing profiles.

Only then I start with the detailed design.

How did you calculate the weight, have you already printed comparable wings?
Which filament do you want to use?

[RJMathiyazhagan]

Thank you for your reply.

I understood that before I proceed with the CAD modelling, I need to work on the aerodynamic sizing of the aircraft.
That seems to be a proper work flow.

I intend to use PLA printed fuselage and foam core wing.

I used the weight of the previous electronics that I had on the model as a reference. I also made a rough estimate of the structure weight based on my past fixed wing model designs.

[wersy]

Mixed construction PLA/foam is a good decision. To save weight, I would make the fuselage part that is printed as slim as possible.

In any case, you need to be clear about which airfoil to use. What you have shown is totally wrong. This is a typical profile for normal airplanes. Flying wings react very sensitively. They need very special airfoils, and if the wing is swept, they are often built with twist/wash out.

[RJMathiyazhagan]

Thank you for your feedback. Regarding the airfoil, you’re absolutely right.
I will definitely consider your suggestion for the next step of the project.

Do you have any specific airfoil recommendation that would work well with flying wings? I would like to hear your opinion on this matter.

[wersy]

---

@RJMathiyazhagan  schrieb:
Thank you for your feedback. Regarding the airfoil, you’re absolutely right.
I will definitely consider your suggestion for the next step of the project.

Do you have any specific airfoil recommendation that would work well with flying wings? I would like to hear your opinion on this matter.

---

I have too little knowledge to recommend an airfoil. The effort required for such a plane is far too great to simply try one out.

There are many sources where you can get information, for example here.

https://www.mh-aerotools.de/airfoils/foil_flyingwings.htm

https://www.mh-aerotools.de/airfoils/nf_1.htm

The difference to conventional airfoils is well explained here.

https://www.mh-aerotools.de/airfoils/flywing1.htm

[RJMathiyazhagan]

Thank you so much for your valuable insights.
I really appreciate your feedback and guidance. I think it's better to test the design with a small foam build version before going into 3D printing. That way, I can make sure everything works as expected and avoid wasting time and resources.

You are very helpful and supportive thank you Mr @wersy.