Shelling issue

[BilalHussain5008]

I can't seem to shell this model any thicker than 0.3mm

I get the "can't offset selected faces". I've tried the "splitting body" and "scale techniques", but somewhere along the process, I get the same message. 

I've even tried Powershape and Plasticity...

[laughingcreek]

can you export your model as an .f3d and attach that instead of the step file?

[wersy]

Before you get lost in the details. Is it supposed to fly?

If so, forget the airfoil. This will give you a strong negative pitch moment that cannot be compensated by the elevators.
In addition, the elevators cannot move upwards in the way you have designed it.

[BilalHussain5008]

Hi wersy.

The elevators need to be moved back by 5mm to create a gap, similar to that of a slotted flap. I've conducted some basic research, which suggests that using the MH60 airfoil and placing the center of gravity towards the front will result in a flying wing.

Thanks for the thought:)

[TrippyLighting · Accepted solution]

The wall thickness in this area is too small to be shelled any larger than what you have already encountered. 

[BilalHussain5008]

Thanks for answering!

Here you go folks! A f3d.file

[BilalHussain5008]

Hi, thank you for your response!

Maybe splitting the body into simpler sections will solve my issue. I'll give that a try!

Thank you for your time, sir.

[BilalHussain5008]

This seemed to work, but I can't shell it to between .799-.804mm

Oh well, I'll use .805mm 🙂

[TrippyLighting]

I think we were hoping for a .f3d file with a design timeline that shows us how the object was modeled 😉

Although if that doesn't exist, I guess the STEP file is fine, but it will require a very different workflow.

[BilalHussain5008]

I managed to achieve a shell thickness of 0.8mm by splitting the body in a specific way. For future reference, if a complex geometry fails to shell, consider splitting it up.

[wersy · Accepted solution]

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@BilalHussain5008  schrieb:
Hi wersy.

The elevators need to be moved back by 5mm to create a gap, similar to that of a slotted flap. I've conducted some basic research, which suggests that using the MH60 airfoil and placing the center of gravity towards the front will result in a flying wing.

Thanks for the thought:)

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A gap between aileron and wing?
You know that in flight the gap must be almost airtight?

You can also take NACA0010 (if you need the thickness)  and adjust the S-stroke with elevator.
I have done this with all my deltas like this one.

https://www.thingiverse.com/thing:4981477

[BilalHussain5008]

A gap between the elevators and the wing. Like in a slotted flap:)

Very impressive that you have a wing loading of 2.88kg/m2. I managed 4.9kg/m2 (RC planes have a range of 2-12kg/m2)

What were your motor output(w) and battery watt-hours? Flight duration? Pitch speed?

[wersy]

About 250 watts at full throttle.
5 minutes flight time at mostly top speed (the controller has slowed down then) with 2200mAh 3S battery.
That's all I measured.

[BilalHussain5008]

Can't recommend this enough! (https://rcplanes.online/calc_motor.htm) and (https://www.ecalc.ch/perfcalc.php)

Great for calculations and optimization! Finding parts. I plugged in your values and got 5.25 minutes of flight time.