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3DPrintAir

Sparrow 3D Printed Plane

by 3DPrintAir Nov 9, 2018
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Hi!

I already have started printing.
But I have a Problem with the Fuse3_10D2 my Cura says the Part is to small to open? I think they mean to big because it has 61MB. Is there a misstake in this part?
Hope you can help.
Thanks for creating this!

It looks like I exported the part in inches, which made the part incredibly small when you imported with S3D standard mm units.
I have updated the part, so let me know how it works for you. Keep an eye on my website for more detailed printing ab build instructions.

Thanks!

Thanks for creating this and posting the files.

I had a problem with the Fuse3_10D2.STL file. It seems to have a couple of artifacts ( red dots in screenshot ) that make flipping the model a problem for print ( as instructed ). I chopped them off in Meshmixer once I realized what was happening.

Thanks for catching this! I never noticed these extra solid bodies because I always printed that part with the opposite surface facing the bed.
Simplify 3D will often ignore bodies that are entirely below the print bed.

I have updated the Fuse 3 file to fix the extra geometry you spotted that was causing your slicing issues. Cheers, and thanks again!

Hi I have built many RC models in the past I have a couple of observations reguarding the stability of this plane it has no diheadral therfore it will not turn any inputs that you refer to as rudder or aileron (elevons) will just make it spiral elevon control is great for flying wings but not for the type of aircraft you have designed it needs ailerons or diheadral or both

It has diheadral, your can look at the center wing section in the thingiverse viewer to simple see it for yourself.

Yes I see that it has dihedral but this is a rudder only plane and they require a lot of dihedral plus you have chosen probably one of the most difficult types of tail plane a V tail with a propeller up front a notoriously difficult combination. I like the design sadly I am not able to understand how to do these designs otherwise I would offer more help. Downloading and printing things is easy!!(I use the term advisedly) design is a different thing. Something else comes to mind a lot is spoken about the C of G and balancing the aircraft at a certain % of the wing cord this is not the C of G it is the point of balance a very different thing to the point of lift as well as the C of G this will also have an effect on the flying characteristics.

How can you magically judge what amount of diheadral is needed sir? You don't have to say sorry for a problem that you are not sure exists.

Hi it's not magic it's a fact if you care to look back at RC models from the past that were single channel rudder only they have a lot of Dihedral without it it will not turn with respect I have been building and flying models of one sort or another with varying degrees of success for some 40 odd years, I have read the varying degrees of success that those who have printed this model have had in trying to fly it and what they describe fits my opinion of the problem with this design,I am sorry if my criticisms upset you but that's what forums are for.

The battery and servos are low mounted in the fuselage. The wing, in addition to having the dihedral that you did not notice, is high mounted to add additional stability. If you want more stability, you can easily model polyhedral into the wings by skewing the outer wing sections without needing to change any other parts to compensate. In case you forgot, dihedral decreases lift, and part of the issues of designing a plane that will print in an 8in cube is wing area. Forgive me for not compromising the already low lift with 20 degrees of diheadral.

I will take your advice after you have tried the model and given real feedback. I will not work hard to make changes based on someones speculation.

Still no evidence of this plane flying well? If you're selling gcode for $10 then I think there should be published tests at the very least...

Question.

For example, on the part Fuse1_10C2. Are the inner structures supposed to be detached from the outer wall?

I ask, because in Cura, when the surfaces walls are too close together, you start to see a pattern on the outer wall that resembles the internal structures.

Yes, the internal structure, and aircraft skin are two separate bodies. I have had no problems with artifacting of internal structures on the aircraft skin in my prints. If you do, I suggest that you avoid adjusting any print setting that could possibly lessen layer adhesion.

The CG as around 20-25% MAC. At first I set up controls as elevons (for Pitch and Roll) after the first two failed throws we thought with it being a V-Tail which traditionally is used for Pitch and Yaw, like in a Bonanza I set up controls for Pitch and Yaw but that didn't seem to work either. Would like to get it flying as it is a cool little plane and hopefully fairly quick. Thanks for your help.

Have tried 6 times to get this little plane to fly but all resulted in an uncontrolled crash 10-30 feet from launch. I have been flying every kind of rc plane, jet and heli for 20 years but I can't make this fly. Tried setting up v-tail as a traditional pitch/yaw and also for pitch/roll. Can get pitch control but yaw and roll are unstable. Very cool looking design and would like to see it fly. Feel like it needs either more dihedral or added ailerons. Unfortunately I don't have video.

Did you try moving the CG forward at all? This plane need to be balanced at around 22.5-25% MAC. Not the usual 30. This plane has no yaw control so I am not sure how you set up the control surfaces.

Do I also print the 4th fuselage part with 0 top and bottom layers and 1 outer layer?

No, You have to print Fuse4 with some top layers, so that the tail surface attachments print completely. Post the print when you are done!

How did you attach the control surface to the stabilisers?

Glue strips of heat shrink, or some other strong fabric into the slots in the tail. Once all the slots in the tail are filled, do a dry fit test to make sure that the CS fits well on to the material sticking out of the slots in the tail. If you are ready, wet all the heat shrink extending from the tail with CA and slide the CS into place and hold for 1 min.

Halfway finished, do you have any videos of it flying?

Look great.
Wing span?

510mm tip to tip

How much do all of the 3d printed components weight together (roughly)?

Thanks :)

The plastic parts themselves should be between 180-190grams if your print setting are dialed in.

I will have them up soon on my website. I'll comment here again when they are ready. Thanks!

do you have build instructions?

Very nice and easy to print!!!

Thank you for this thing! Thumbs up to you!

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Thanks for the compliment! Enjoy!

Comments deleted.

I cannot explain why that would have happened. Please email me at [email protected] and I will get you whatever file you are missing.

Thanks o lot. And I am very sorry because I finally found then at the original file. Thanks.

But... does it fly? :-)

It looks awesome and I'd love to print and build this one, but I'd love to hear if and how it actually flies... Every 3D printed plane is awesome off course. :-D

Thanks for putting up the design.

Comments deleted.

Prusa Slic3r won't print or see the internal structure of your designs also, which is a shame. I was looking forward to printing it out and see if I could have got it airborne by the weekend. If you do find a fix please let me know as I would love to print this model.

Cura is a free option that will work well if you un-select "union overlapping volumes"

Thanks mate. I have just downloaded Cura, where can I find this "Union Overlapping Volumes" to unselect it?

It's under "Mesh Fixes" - click the 3 little bars next to the search window and select "Show All Settings" and scroll down (to explore stuff I had no idea Cura could do) until you find it or just type "Union" in the search window.

I cannot get Cura to print the internal structure? it is not showing up in the slicer, just the outside skin is.

Nickgreen,

As TimMcCarthy pointed out, on Cura...

Look for Mesh Fixers > Union Overlapping Volumes

Make sure is un-selected.

Hmm, I use S3D, and it doesn't have any issue. Have you checked the print preview to make sure that your slicer is recognizing the internal structure? Which part are you having trouble with?

Yeah that’s the problem it isn’t showing up in the preview just the skin is the inside is just showing as empty and I’ve tried to print and it prints as in the preview as just the shell. I’m having the same issue on all the parts with that internal structure.

3D Print Labs has a work around for their planes in Cura. Sounds like a similar problem. I would check out the instructions for Cura on 3D Print Labs.

make sure union overlapping volumes is un-selected. worked for me

Looks pretty sweet! I would like to see one built and flying...

Thank you! Sorry about that... build log and flight coming soon! Just a little headache learning how to set up the website.