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Jun 01, 2012, 02:45 AM
Registered User
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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Jun 01, 2012, 01:27 PM
Zen in the art of foam
djacob7's Avatar
Wow! 2.3 meters is HUGE! Good luck on the maiden!
What glue do you use between wood and foam?
Jun 01, 2012, 04:33 PM
Registered User
Originally Posted by djacob7
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.
Jun 02, 2012, 05:27 PM
Registered User
Latest pic┤s from the workshop
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Jun 03, 2012, 09:57 AM
Registered User
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
Jun 03, 2012, 06:09 PM
Registered User
First wingsection almost done.
Weight this far is 146g/5oz

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Jun 03, 2012, 06:55 PM
Registered User
Thats huge! Great work so far.
Jun 04, 2012, 03:51 AM
Warbirds Lover
Dreamcatcher's Avatar
Hi !

Very interesting project...

Subscrived !
Jun 07, 2012, 11:18 AM
rebell's Avatar
How is the progress?
Jun 07, 2012, 04:54 PM
Registered User
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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Jun 09, 2012, 08:58 AM
Registered User
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
Jun 10, 2012, 04:31 PM
Registered User
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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Jun 12, 2012, 02:44 PM
Registered User
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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Jun 15, 2012, 04:54 AM
Registered User
Status this far

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

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Dowels in 2mm carbon
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