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Jun 27, 2019, 12:44 AM
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p901P901's Avatar
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Yakovlev Yak-23


90-100mm EDF
64" wingspan, length 56"

OML printed ASA filament, internals made with printed and wood parts.

Preliminary design is here: https://grabcad.com/library/yakovlev-yak-23-scale-1-1-1. So far, I am making mods with Fusion 360 to this design to fix some discrepancies.

This will be an test to see if there is any benefit to just printing the skin than other conventional methods.
Last edited by p901P901; Jun 27, 2019 at 06:22 AM.
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Jun 27, 2019, 09:31 AM
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Lynxman's Avatar
I think you will want to point the efflux down one or two degrees instead of up like shown in your exhaust shape illustration, because the thrust line is quite low. If you point the efflux up like that it will probably pitch up when throttle is increased.
Jun 27, 2019, 09:30 PM
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Dirty Dee's Avatar
Subscribed!

Always liked the flora, and thought it looks like it was just an engine with wings.
Jun 29, 2019, 05:32 AM
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p901P901's Avatar
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Started the Former install


Skin will be a single layer, thickness will be around .030" using a .6mm nozzle. Formers will be .125" light ply in the front and balsa in the back.
There will be some 1/8" x 1/4" stringers installed connecting the formers.
Repositioned the fan and exhaust duct.
Jul 02, 2019, 07:20 AM
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To many problem with the Grabcad model, so I had to redesign the fuselage.
Redesigned the main gear like the real one and found that there was not enough room for the main gear to retract into the fuselage. Fixed by making the fuselage larger near the main wheel well. Nose gear was redesigned also. When this was retracted it would interfere with the splitter in the intake. Splitter was redesigned. With the bigger exhaust, the fuselage area around it needed to be larger also.

The model from Grabcad was designed in Solidworks. Importing this into Fusion caused the fuselage to be in surfaces and not bodies. The only fix was to convert to a mesh and then into a Brep. This made the fuselage editable, but not to the extent I needed. So the only way was to remake the fuselage.

Will not use the airfoil in the file. Will use S8307 for the root and S8036 for the tip.
Last edited by p901P901; Jul 02, 2019 at 05:04 PM.
Jul 08, 2019, 05:45 AM
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Started with a new fuselage and so far its easier to modify than the Grabcad file. I am a novice with Fusion, so it was a struggle to get the fuselage somewhat correct. Almost went back to Turbocad pro.
Jul 08, 2019, 09:00 AM
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Nice work !!! Fusion is tough. I'm still trying to understand the 'components and bodies' thing .
Jul 22, 2019, 03:20 AM
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Retracts


I think I finally have these retracts figured out.
At first I was going with electric retracts but the gear does not extend and retract at 90 degrees. I was thinking about making some electric actuators and using a JP Hobby retract controller, but that would be costly and time consuming. So looks like the best solution is to use air actuators.
The nose retract needs some more work. It retracts fine, but need to figure out steering.

Still struggling with Fusion. Hopefully I can get this project done before Autocad starts asking for money . By the way--did any one see the 50% off sale for Fusion. Terms?
Jul 22, 2019, 10:58 AM
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Quote:
Originally Posted by p901P901
Still struggling with Fusion. Hopefully I can get this project done before Autocad starts asking for money . By the way--did any one see the 50% off sale for Fusion. Terms?

I hope they don't start charging . I've become dependent on it !!
Jul 22, 2019, 11:51 AM
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Ken Lapointe's Avatar
Looks good.

We should start a how to model an airplane in fusion 360 thread.

Guys, fusion 360 is free to hobbyist's

https://knowledge.autodesk.com/suppo...I4eHhiS3Q1NyJ9
Jul 22, 2019, 08:03 PM
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Kevin Cox's Avatar
Quote:
Originally Posted by Ken Lapointe
Looks good.

We should start a how to model an airplane in fusion 360 thread.

Guys, fusion 360 is free to hobbyist's

https://knowledge.autodesk.com/suppo...I4eHhiS3Q1NyJ9
Yes, you guys should!
Jul 23, 2019, 02:51 AM
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The file I started with was downloaded from Grabcad. This was a full scale model and was imported as a Solidworks file into Turbocad Professional and then rescaled and exported as a .dxf file. The .dxf file was imported into Fusion and saved as a Fusion file. All sketches and bodies were rescaled. After looking all the discrepancies of the model and doing additional mods, I may be using 10% of the original file.
Last edited by p901P901; Jul 23, 2019 at 03:48 PM.
Aug 05, 2019, 02:52 AM
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Wings


Working on the wing internals. The stringers, spars and ribs will be wood. May go with printed ribs if I can find a glue that works with ASA and wood.
A Robart #620108A air cylinder will be used for the main retracts. There will be mechanical stops that will limit the cylinder's stroke to .8".

Wing skin will be single layer .030" thick ASA
Last edited by p901P901; Aug 05, 2019 at 05:33 AM.
Aug 08, 2019, 04:56 AM
Build'em and Crash'em
Ken Lapointe's Avatar
How are you doing the individual ribs?
Aug 08, 2019, 07:38 AM
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Quote:
Originally Posted by Ken Lapointe
How are you doing the individual ribs?
Yes the ribs will be individual. It will be a build up wing with the printed skin. Ribs will have temporary tabs for jig building. Wing ribs past the mains could be balsa or foam board. Was thinking of honeycomb infill for this, but this may be slightly heavier. Wing tube is 7/8", spars are 1/2" x 1/8" bass wood. The other strips are balsa.


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