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| Git 'R Dun - Giant Scale! From the box to the runway. Whatever it is, show us how you build 'em! (build threads only) |
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09-27-2006, 12:04 PM
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#1 |
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Bad-ass Super Contributer!
 Join Date: Jan 2005
Location: Ozone Park,NY
Posts: 919
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Scratch built 126" Extra 300
As some may remember, I started desgning a scale Extra 300 in Winter 2005. It went on a back burner during the flying season, but I slowly finished the design over last 2 months.
It's all built up balsa, lite ply and carbon fiber construction. I tried to follow full scale design and assembly procedures as much as I could. Hopefully, at the end I'll end up with a good airplane !! Well, it's time to build the thing !
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09-27-2006, 12:07 PM
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#2 |
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Bad-ass Super Contributer!
Join Date: Feb 2006
Location: UAE
Posts: 350
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Re: Scratch built 126" Extra 300
Nice construction!
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09-27-2006, 12:07 PM
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#3 |
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Bad-ass Super Contributer!
Join Date: Jan 2005
Location: Ozone Park,NY
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Re: Scratch built 126" Extra 300
As I was waiting for laser cut parts, I contemplated having Kinko's print my plans, but decided to draw the plans by hand instead. A dimensioned printout from CAD software was used to make the full scale drawing.
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09-27-2006, 12:11 PM
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#4 |
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Bad-ass Super Contributer!
Join Date: Jan 2005
Location: Ozone Park,NY
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Re: Scratch built 126" Extra 300
Next, I laid out the fuselage sides truss from a mix of 1/4" basswood and balsa sticks. Aluminum channels are used to keep everything true.
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09-27-2006, 12:13 PM
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#5 |
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Bad-ass Super Contributer!
Join Date: Jan 2005
Location: Ozone Park,NY
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Re: Scratch built 126" Extra 300
Joints are reinforced by 1/32 plywood.
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09-27-2006, 12:14 PM
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#6 |
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Bad-ass Super Contributer!
Join Date: Jan 2005
Location: Ozone Park,NY
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Re: Scratch built 126" Extra 300
One side done - that was easy ! A mirrored version followed next.
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09-27-2006, 12:17 PM
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#7 |
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Bad-ass Super Contributer!
Join Date: Jan 2005
Location: Ozone Park,NY
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Re: Scratch built 126" Extra 300
Now I align the sides over the top plan view and make sure everything is square (specially the future wing spar sockets).
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09-27-2006, 12:20 PM
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#8 |
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Bad-ass Super Contributer!
Join Date: Jan 2005
Location: Ozone Park,NY
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Re: Scratch built 126" Extra 300
At this point, my camera battery died, so while it was charging, I finished the rest of the basic fuselage frame. First the top, then the bottom. Again - aluminum channels keep everything true.
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09-27-2006, 12:26 PM
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#9 |
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Bad-ass Super Contributer!
Join Date: Jan 2005
Location: Ozone Park,NY
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Re: Scratch built 126" Extra 300
At this point, I spent 4 days between drawing the plans and the fuselage frame.
Move over fuse - box from a laser cutter is here ! I should have made the retention gaps on all the parts.... Good thing I wasn't lazy to label the individual pieces. Couple hours of sorting and it's starting to make sense.
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09-27-2006, 12:32 PM
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#10 |
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I'm Watching You!
  
Join Date: Jan 2006
Location: Connecticut, USA
Age: 29
Posts: 8,616
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Re: Scratch built 126" Extra 300
Excellent Job Paul! Glad to see your continuing this project! Cant wait to see it on the IMAC circuit next year!
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John Banks www.jtecrc.com www.DesertAircraft.com www.aircraftinternational.com www.3dhobbyshop.com www.rcarmour.com www.stansphotos.com |
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09-27-2006, 12:37 PM
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#11 |
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Bad-ass Super Contributer!
Join Date: Jan 2005
Location: Ozone Park,NY
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Re: Scratch built 126" Extra 300
I figured rudder would the easiest to start with.
I'm really glad I spent the time on designing the interlocking parts.
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09-27-2006, 12:39 PM
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#12 |
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100% EDGE Builder
Join Date: Jan 2006
Location: Guthrie, OK
Age: 36
Posts: 1,001
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Re: Scratch built 126" Extra 300
Paul,
This looks awesome! It is cool to see soemthing like this from scratch. I will definitely be watching this thread. One thing I am sure you are aware of but will say anyway. The only disadvatage I have seen to a built up wing compared to a foam wing is that extra care must be taken to get the ailerons stiff enough. Sometimes the blow back feel is from flex and not servo power. Good luck and keep it up! Dan |
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