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Nov 23, 2007, 01:23 PM
madrob's Avatar
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Build Log

Gee Bee Z - 28" span

So here's what I have been spending some spare time on lately.

I had been thinking of converting the Dumas 24" GBZ to RC but it just seemed a little too small for what I had in mind and I wanted to have a more scale looking plane. The only solution was to design my own and might as well have it laser cut as well.

Specs are:

Wing Span: 28"
Wing area: 128 sq in
Target wing loading is under 10 oz/sq ft so my target weight is 8.9oz RTF.

Power plant with be a GWS IPS-A gearbox with the Medusa MR-012-030-4000 (4000Kv) motor and a 3 cell 300-350 mah lipo.

I'm going to try using the GWS Pico servos since they are cheap and work very well.

(Feb. 16, 2008)

Short kits including plans, canopy and most of the wood (you supply the 1/8" X 1/16" sticks for stringers) are now available.

Full graphics sets are available from Callie Graphics:
Last edited by madrob; Apr 05, 2013 at 09:05 AM. Reason: update link
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Nov 23, 2007, 01:30 PM
madrob's Avatar
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The fuselage took a long time to design but it turned out to be very easy to build and light.

First, the side formers are glued to the fuselage sides.
Nov 23, 2007, 03:46 PM
Need 4 Speed!
pdawg's Avatar
Sweet project! Can't wait to see how you designed the parts to ease construction. Do you plan to sell kits?
Latest blog entry: original Y/A F-18 Kit
Nov 23, 2007, 09:31 PM
madrob's Avatar
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We'll need the fin before continuing with the fuselage so here's the tail surfaces all built up. You can see the parts all interlock so they come together very fast.
Nov 23, 2007, 09:42 PM
madrob's Avatar
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The fin is glued in place and then start adding stringers. The stringers are all 1/16" by 1/8" balsa. After the side stringers are attached the 1/32" forward skins can be installed.
Nov 23, 2007, 09:51 PM
madrob's Avatar
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Next, the aft upper stingers are installed along with the stab filler piece. Then the rear sheeting is installed. This is a laser cut 1/32" balsa part with pre cut lines for cutting out the cockpit hole later.
Nov 23, 2007, 09:59 PM
Vintauri's Avatar
I'll watch this one with interest.

Nov 24, 2007, 02:13 PM
madrob's Avatar
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The tail skid is glued in place and then the belly stringers are installed around it. Next, the battery hatch is built and sheeted.
Nov 24, 2007, 02:16 PM
madrob's Avatar
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The forward fuselage is built up with laminations of 1/4" balsa. these will be sanded to give this section a rounded profile.
Nov 24, 2007, 02:25 PM
madrob's Avatar
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Now for the cowl. It's all balsa and just needs a little sanding......Ok, a lot of sanding!
Last edited by madrob; Nov 24, 2007 at 07:11 PM.
Nov 24, 2007, 03:00 PM
Res Ipsa Aviatur
Longhorne's Avatar

This is coming together really nicely.
Good work,

Nov 24, 2007, 03:06 PM
zbrubaker's Avatar
Nice...I like it!
Nov 24, 2007, 07:11 PM
madrob's Avatar
Thread OP
Thanks guys!

The parts I got from Charlie at Manzano Laser are great. Good choice in balsa weight and the cutting is very nice.

More updates soon.

Nov 24, 2007, 07:47 PM
Veni, Vidi, Napi
catrancher's Avatar
This is indeed... schweet!!


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