Thread Tools
Aug 08, 2019, 08:45 AM
Build'em and Crash'em
Ken Lapointe's Avatar
Sorry, ment how did you make the ribs in Fusion 360. did you do each one individually, or is there a plug in you used?
Sign up now
to remove ads between posts
Aug 08, 2019, 02:48 PM
Registered User
p901P901's Avatar
Thread OP
Root and tip ribs were imported as canvases. they were then placed on planes. Tip canvas was moved for washout. Sketches were made for both ribs and then in patch space they were lofted. Additional planes were made 4" apart along the loft (this is for additional ribs. On each plane I placed rectangle boxes .125" thick and them cut them with split body in patch mode. Deleted the left overs from the boxes.
Spars are made with rectangles at each end of the root and tip ribs and then a line was snapped to each rib and then it was swept lofted in model space.
Last edited by p901P901; Aug 08, 2019 at 06:26 PM.
Aug 08, 2019, 03:58 PM
Build'em and Crash'em
Ken Lapointe's Avatar
Thanks for the explanation. Using the construction plane to slice the loft was a neat idea.
Aug 11, 2019, 04:38 AM
Registered User
p901P901's Avatar
Thread OP

Bones


Started on the fuselage internals. Most of the formers will be .125" balsa and the longerons will be .125' x .250 bass wood. #3 former will support the 7/8" wing tubes. This will be printed with 2 layers top and bottom with 6 perimeter layers, infill will be 20% honey comb.

The intake splitter needed to be enlarged so the nose wheel fork will fit inside when retracted. This ended up leaving about 90% FSA for the 100 mm fan. Intake area was enlarged to 110%. Jetfan 100mm with 12 cells max thrust is 15 lbs. No guess on how much this plane will weigh.
Last edited by p901P901; Aug 11, 2019 at 04:49 AM.
Aug 13, 2019, 08:58 AM
Dont forget the velcro straps
corsair nut's Avatar
Awesome project phil!
Aug 15, 2019, 01:51 PM
Classic jets rule
AIR SALLY's Avatar
very interesting Phil, ill be watching.
Aug 15, 2019, 05:05 PM
Registered User
jumo004's Avatar
Nice cad work !

Are you using the material library in Fusion and keeping track of your total weight and center of mass ?
It's a pain to set up but once you get it done and saved as your 'favorites' it works real nice.
That info along with your c of g and you can move parts around to get the plane close on balance.
Saves some headaches down the road.

Cool subject !
Aug 17, 2019, 05:17 AM
Registered User
p901P901's Avatar
Thread OP
Yes there are many useful tools in Fusion. I am looking at the stress analysis tool for the spar former that I designed and found ways to get it lighter. For the weight and balance, I started making the front of the fuselage. In Simplify3d the quoted weight would be .22 lbs with ASA density of 1.07g/cm3, time to print would be 1.9 hrs. After printing the actual weight was .2lbs and 2 hr print time.
Printed part ended up to be .045". This should have been .035". Need to adjust extrusion width some. Multiple blobs in print also, need to adjust extra restart distance. Another problem is, on opposite sides of part, there is layer separation. It looks like one layer did not print causing the others to fail because of this.

I am using modified CR-10 with merlin software. The hot end is a E3D Volcano with a .6 mm nozzle. Enclosure stays around 110 F.
Last edited by p901P901; Aug 17, 2019 at 05:52 AM.
Aug 18, 2019, 02:34 AM
Registered User
p901P901's Avatar
Thread OP
Could not print .035" walls, had to go .045" Still have blobs in the print but got two section done in under 5 hrs. Started cleaning the first section and found that scraping with a utility knife removes the blobs and smooths out the layers. When all the parts are done I will mate them with internal joiners and then use
.75 lb cloth and a light whipping of acetone to bond it to the plastic. So far I have .5 lbs of plastic.
This ASA is pretty strong and could just go with 2.4 oz uni carbon cloth internally and eliminated some of the formers. `
Aug 19, 2019, 03:33 AM
Registered User
p901P901's Avatar
Thread OP
After 3.2 hrs one more section printed. Still getting some defects, but can be repaired. Total sections weight is .82 lbs
Last edited by p901P901; Aug 19, 2019 at 03:40 AM.
Aug 29, 2019, 07:25 PM
Classic jets rule
AIR SALLY's Avatar
Nice hi tech work Phil.
Aug 30, 2019, 08:33 AM
Registered User
Dirty Dee's Avatar
Are you experiencing any warping toward the base of the parts that contact the build plate? When I was working on my airbus, I noticed about 10-mm worth of concavity/bowing inward for large fuselage sections.

The solution I came up with was extrude the contact surface by another 15mm, and applied a fillet to the edges. This allowed the "sacrificial base" be by snapped away cleanly and easily.


Your fuselage is coming along nicely.
Aug 30, 2019, 02:31 PM
Registered User
p901P901's Avatar
Thread OP
Thanks roger.


DD:
I am using kapton tape on my bed with some ABS juice (acetone/ABS mix) brushed onto the surface. Also use one skirt layer with 8 outlines. I do get some warping near the base and areas near cutouts. My prints are fairly smooth near the bottom and I get banding near the top of the print. Thought this was was due to warping, but could be because of a bad z motor. This eventually failed on one print.

I used acetone to glue halves together and abs/acetone paste to fill the imperfections. I also could use automotive spot putty on ASA or ABS for filler.

I ended up replacing my Z motor and extruder motor with Moons'. Did not know that these motors have different pin-outs, so I ended up blowing the extruder driver. Should get a new board today.
Last edited by p901P901; Aug 30, 2019 at 02:37 PM.


Quick Reply
Message:

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Yakovlev Yak-12 GeorgeG97322 Scale Drawings and Three Views 5 Feb 23, 2019 07:06 AM
Discussion Yakovlev Yak-6 GeorgeG97322 Scale Drawings and Three Views 2 Aug 14, 2016 01:10 PM
Discussion Avios Yakovlev Yak-52 1100mm DutchRC Electric Warbirds 6 Oct 18, 2015 03:00 PM
Discussion Yakovlev Yak-52 TedD60 Scale Drawings and Three Views 4 Sep 20, 2015 08:48 AM