Douglass Dauntless at 30" for 5 ch. - RC Groups
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May 09, 2006, 10:15 AM
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P. Tritle's Avatar
Build Log

Douglass Dauntless at 30" for 5 ch.

OK, the plans are done, parts are in hand, and construction has begun

After Flying the Rittinger designed Dauntless with J-Best I decided that since Marks design flew so well, that it might be fun to try a smaller one -- just to see what would happen.

Since low wing models really need ailerons, this one will have them, and since I decided to go with the GWS PICO retracts, a rudder was in order too. And, since the ailerons are done in scale outline, there's a pretty good chance they will exhibit a bit of adverse yaw, so the rudder would come in handy anyway.

The model is laid out with a 30" span, and 185 sq. in. I'm looking at the Maxx Products EPU-2828 S-280 drive unit with an 8-6 prop and an 880 3 cell battery. But, there's also a ton of good brushless stuff out there that would work great too. Target weight is around 14 oz.
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May 09, 2006, 10:18 AM
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Framing Begins with the Fuselage

The fuselage is built around a trussed box frame with quarter formers. The basic side frame is built up from one laser cur part, 1/8 sq. longerons, and 1/16 X 1/8 vertical braces.
May 09, 2006, 10:20 AM
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Joining the Side Frames

The side frames are joined using 1/16 X 1/8 balsa crosspieces.
May 09, 2006, 10:23 AM
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Adding the Outer Formers

The fuselage will be rounded out using formers and stringers. The formers are in place now, with the next step to get the 1/16 sq. and 1/16 X 1/8 balsa stringers glued in place. Will post up the results as soon as it's all together.

May 09, 2006, 10:59 AM
Balsa is love....
glue_sniffer's Avatar
SWEEEEEEET! Great build choice Pat, and I'm sure it's going to fly really nice!

Is this the "real surprise" or is something even more surprising waiting in the wings?

May 09, 2006, 12:59 PM
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Just couldn't wait huh? Drop off the parts yesterday and here's the fuse already framed up.

Should look and fly great. Don't forget the twin .50's in the back!

May 09, 2006, 01:22 PM
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P_J_Glor's Avatar
Whether or not it is the "real surprise," it knocked my socks off. Subscribed and looking forward to more!

Going to work "sockless"

Pete G.
May 09, 2006, 03:45 PM
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floss's Avatar
Neat subject with a compact wingspan, keep it coming.

May 09, 2006, 04:19 PM
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Looks good!
By the way, it's one S on the Douglas, and twin .50's were too heavy, so it was twin .30's. (Friend & co-worker Les McKinley was a back-seater with the "Cactus Airforce", at Henderson field, back in '42). Usually, Les referred to the SBD's as "Slow, but Deadly", or just "Speedy Bombers".
May 09, 2006, 09:46 PM
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Finishing the Fuselage

Adding the stringers was next in line with the fuselage. The wing mount arrangement was boxed in next, the the whole assembly lightly sanded to know down the bumps.
May 09, 2006, 09:49 PM
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Roughing In the Wing Fillett

The wing fillett is such a dominant feature on the Dauntless that it just can't be fudged. The good news is that it's so big that it's not hard to do. The aft section was built up from balsa and glued in behind the wing mount. The forward sections are 1/64 ply. The side formers won't go in until after the frame is covered.
May 09, 2006, 09:54 PM
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Starting On the Wings

The front and rear wing spar assemblies are built up from 4 sections each -- 3 parts to the spar, with a center section doubler. Since this one is set up with the landing gear, a little extra strength in the middle sure won't hurt.

The main spar sections were glued together with Cya, then the doublers laminated with White glue and weighted with lead ingots for a couple hours to dry. The aileron spars and spar caps were done the same way.
May 09, 2006, 09:55 PM
Kansas is windy.
pburress's Avatar
Looking great Pat! I always enjoy looking over your shoulder with these build threads.

Brushless is obviously desirable but if you are considerig a geared 280 brushed, think about the lowly j-250 motor as an alternative. The power will be closer to a 370 but it weighs less than the 280. I use it geared 4:1 with a 7x6 prop and 2s battery and it draws between 5-6 amps WOT on the bench. I have this setup in the Herr 35" breezy day cub as well as a Guillows Stearman conversion and it works great, with power to spare.


PS you might consider a GWS setup because the gearboxes are a little better, IMO.
May 09, 2006, 09:58 PM
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Framing the Center Section

The wing center section was framed over the plans. The spar/rib assembly "egg crates" together so alignment is easy, and the assembly goes together quickly. The bolt plate, trailing edge and leading edge were glued in next. The outer panels will be built on the plans, one at a time with the other end blocked up.

The bowed outlines for the wingtips, stab tips, rudder tip and dorsal fin were formed up while the glue dried elsewhere.

May 09, 2006, 10:05 PM
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P. Tritle's Avatar
Sky, This is one of them. A little out of character, I know, but seamed like the time was right to slip in a Warbird.

PJ, As long as you have to walk around barefoot, at least it's not dead of winter! Good timing.

Lancer, Sorry about the spelling goofs. Unfortunately, spelling has always been a struggle, and without Spellcheck I'd be in more trouble that you'll ever know!


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