L-39 classic build 2222mm lenght - Page 4 - RC Groups
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Dec 13, 2012, 04:03 PM
Build'em and Crash'em
Ken Lapointe's Avatar
Wow, looks great. Much larger than I thought it would be
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Dec 13, 2012, 07:13 PM
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Gamalier's Avatar
Hey Pekos have you checked the weight of the empty fuselage yet? Just curious about what's the weight of a ply and balsa plane this size. My 1/6 L-39 empty fuselage was 3000 grams and is way smaller than yours.
Dec 14, 2012, 04:13 AM
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pekos's Avatar
hi, empty fuselage 2700gr. and wings 1000gr.
Dec 14, 2012, 07:23 AM
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Gamalier's Avatar
Quote:
Originally Posted by pekos
hi, empty fuselage 2700gr. and wings 1000gr.
For a plane that big that's awesome!! Should weight around 20-22 pounds with 14s and a 120 fan easily if not less. With its size it should float really nice.
Dec 14, 2012, 07:56 AM
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pekos's Avatar
I hope that it will be up to 9 kg.
Dec 14, 2012, 07:58 AM
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pekos's Avatar
landing gear
Dec 14, 2012, 10:13 AM
Firecracker!
BillO's Avatar
Quote:
Originally Posted by SergeyK
I would still like to hear a little bit about your Sketchup workflow.
I guess my question got buried under well-deserved raves.

Sergey.
I second that - c'mon, throw us a bone!
Dec 14, 2012, 01:47 PM
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pekos's Avatar
for Sergey K. : my knowledge of English isnīt at a high level, I will answer you, but I have to prepare for it, ok?
for Billo to.. :-)

precisely, we consider the plane and all the accessories:

fuselage 2582gr.
wings 1027gr.
EDF with motor. 850gr.
landing gears 890gr.
servos, esc,cables 850gr.
2x6s 6000mAh. 1800gr.
altogether : 7149gr.
+ vynil covering and cabin cockpit = 7500 - 7800 gr.
it looks good so far
Last edited by pekos; Dec 14, 2012 at 02:07 PM.
Dec 14, 2012, 10:38 PM
Firecracker!
BillO's Avatar
Thanks in advance for taking the time to explain even a little bit. Clearly your Sketchup skills are at a very high level!
Dec 15, 2012, 03:10 PM
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D_FAST's Avatar
Pekos, outstanding work!

@ Billo,SergeyK
Im trying come to grasp more with this style of building, Here is a simple vid of how im gonna approach it.

Create Skin/3dmodel
Create formers/Stations
Create Splines
Create Stingers/spine
Create knockouts/lightening holes

example_workflow (4 min 45 sec)
Last edited by D_FAST; Dec 16, 2012 at 05:49 AM.
Dec 15, 2012, 05:09 PM
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pekos's Avatar
wow, very interesting work, I am a beginner and I draw everything by hand. I draw without thickness, because the complicated image saving up computer performance.
Dec 15, 2012, 05:19 PM
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pekos's Avatar
For example, this
Dec 15, 2012, 05:35 PM
Firecracker!
BillO's Avatar
Dan, that looks great, I see where you're going.

Pekos, that is such a beautiful drawing. But when you cut the parts on the laser cutter, how does the machine know how wide to cut the slots where the parts intersect if there is no thickness?
Dec 15, 2012, 06:42 PM
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SergeyK's Avatar
I am a beginner too, and I had to discover things as I went along, that's why I'm interested what others came up with.

I drew with the thickness as it helped me visualize the complete model
https://www.rcgroups.com/forums/show....php?t=1442267

And I had to manually clone each part and drag it to a separate area and arrange on a flat plane to print out.

Did you manually draw the lightening holes on each rib separately or used tome kind of shortcut ?
Last edited by SergeyK; Dec 15, 2012 at 06:49 PM.
Dec 15, 2012, 07:12 PM
Registered User
D_FAST's Avatar
It was just one way and was done on the most simplest of geometry, but like billo said you get the workflow.. The biggest is getting your wing loading,fsa, etc... All calculated then build your model. Then begin your RC conversion using slices and such. Placing electronics, etc along the way.

And yes use mirror and array to speed up work flow.


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