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Old Jun 01, 2012, 02:45 AM
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Build Log
2,3m / 88" Extra 300 Depron/fiberglas composit Scratchbuild - Extreme Light

Hey folks

After building lots of depron planes, including a 1/4 Cub, I have now started this new project:
A 2,3m Extra 300, builded in 3mm Depron, and full covered with 49g fiberglass. I beliewe in a takeoff weight about 4-5kg.

My Cub - takeoff weight 2,2kg
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First step on the Extra
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Last edited by polledk; Jun 03, 2012 at 06:07 PM.
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Old Jun 01, 2012, 01:27 PM
Fremont, CA
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Wow! 2.3 meters is HUGE! Good luck on the maiden!
What glue do you use between wood and foam?
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Old Jun 01, 2012, 04:33 PM
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Quote:
Originally Posted by djacob7 View Post
Wow! 2.3 meters is HUGE! Good luck on the maiden!
What glue do you use between wood and foam?
Between wood and depron i use UHU Por or polyurethane glue - depense on where.
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Old Jun 02, 2012, 05:27 PM
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Latest pic┤s from the workshop
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Old Jun 03, 2012, 09:57 AM
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More pic┤s of the wing construction

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Description: assembly of the box in the wing

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Description: the box┤s for the wing

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Description: complete main bar, 250g
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Old Jun 03, 2012, 06:09 PM
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First wingsection almost done.
Weight this far is 146g/5oz

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Old Jun 03, 2012, 06:55 PM
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Thats huge! Great work so far.
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Old Jun 04, 2012, 03:51 AM
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South of France
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Hi !

Very interesting project...

Subscrived !
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Old Jun 07, 2012, 11:18 AM
JustFlying
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How is the progress?
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Old Jun 07, 2012, 04:54 PM
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Got a few more pic┤s from the work so far.
The wingpanels this far are showing 207g / 7,3OZ each.

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Motor is ordered: Hacker A60-6XS

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Old Jun 09, 2012, 08:58 AM
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The maingears on the market, that will fit this size, are too stiff and heavy, so i┤ll try make one myself.
Laminated in plywood.
First I have wet the 4 layers of 1mm ply, and will let them dry in the form. Them I┤ll glue them with polyurethane, again in the form.


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Description: "Toe-in" is builded in the form
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Old Jun 10, 2012, 04:31 PM
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Maingear is out of the form. It was still feeling wet, so into the owen for 6 hours. Now it feels dry, and strenght is feeling like it will work. weight is 106g
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First wing panel is ready to be sanded, and then fiberglass. Weight incl. aileron is 216g
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Old Jun 12, 2012, 02:44 PM
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Both wingpanels are now ready to be sanded before fiberglas, so its time for the fuselage.
I┤ll use same construction pricip as the Extreme Flight I┤m copying, with an inner section, wich will be the connection between motor, accu, wing and maingear.

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weight for inner section incl. maingear is 310g
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Old Jun 15, 2012, 04:54 AM
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Status this far

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Old Jun 15, 2012, 05:40 PM
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And - some more pic┤s

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Dowels in 2mm carbon
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