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How to Build a B-29

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Old 11-13-2015, 07:49 AM
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kram
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Default How to Build a B-29

Dwayne Fosseen is the Big Cahuna of the Bomber Boys here in central Iowa. This is his 3rd B-29, one might say his FIFTH, and he has built at least that many B-17's and mentored several more. His planes have won and placed at Bomber Field and many other events. His birds have proven their air-worthiness and longevity: I personally own and fly a 120" B-17 he built 29 YEARS ago and a 141" B-29 he built 9 years ago.

If you look carefully in this impromptu photo from his private field, you can see 5 of his planes

NOT man known for being an extrovert or an Internet chatter, he would never post his own build thread, but he has agreed to let me chronicle his most recent project: his third Don Smith B-29. This will be a reversion to his first: a 1/10 scale (the one I now own) the second a 14 ft-er he still flies. Bomber builds usually take him 2 winters, the first mostly devoted to planning and construction, the second mechanical out-fitting and finishing

Hang on to your hats!

Mark Taylor (aka Ambrose Bierce)
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Old 11-13-2015, 08:15 AM
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Old 11-13-2015, 08:19 AM
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Old 11-13-2015, 08:34 AM
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Dwayne's Comments:

Kit cutter did a pretty good job and the wood is perfect; PRECISION CUT KITS

I plan to do the hardest part first (the wing) and the rest will be less of a problem

I plan to put a servo in each engine and use the new Futaba 4-engine control program

(previous Dwayne bombers have a single giant servo in center wing driving 4 cables to the throttles)

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Old 11-13-2015, 08:38 AM
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Glue wing to table with scrap wood scraps with main bottom spar straight and hold washout exact with wing glued to table.

Glue enough scrap pieces to hold solid.

Sanding, TE, aileron and some flap area work will be completed with wing glued to table
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Old 11-13-2015, 08:40 AM
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WASHOUT:

Center of wing Zero degrees

Plug-in wing joint 1.75 degrees

Wing tip 3.0 degrees washout

Last edited by kram; 11-15-2015 at 04:13 PM.
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Old 11-13-2015, 08:46 AM
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Now I will be working the left wing TE: has to come out straight from tip to root with 3.0 deg washout

Flap and aileron have to twist with the washout while being built

Sheeting has to lie flat on a frame that is sanded and positioned with the washout

Top sheeting will somewhat hold the twist and the bottom sheeting locks the washout solid

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Old 11-13-2015, 08:48 AM
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Mark's Notes:

Pay VERY close attention to Dwayne's washout and wing-building notes. They are why his planes fly well at low speed and win awards and last many years
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Old 11-13-2015, 11:38 AM
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Gotta love bombers !
I see you mentioned using a new 4 engine control system. I also have mine set up to use a separate servo for each engine. Are you talking about Futabas MSA -10 synchronizer or is this a program in the radio TX?
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Old 11-13-2015, 03:50 PM
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Futaba 14MZ transmitter

Dwayne still uses 72 MHz. Pretty safe these days, I reckon!
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Old 11-14-2015, 07:40 AM
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TE string system

I increased the total washout to 3 degrees after measuring the 1/48 Monogram model as 4 degrees (+4 at the root, 0 at the tip)

Stab and top of fuse are the "Zero Reference Points"
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Old 11-14-2015, 07:47 AM
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2-3/8" holes cut for air tanks on both sides

1" holes cut for servo wires, tubes, etc
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Old 11-14-2015, 07:51 AM
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Thin Ca 1/8 strip to hold upper flap/wing pocket
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Old 11-15-2015, 08:13 AM
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Supports are added until top wing sheeting is glued
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Old 11-15-2015, 04:07 PM
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Made a couple new spar braces with a little less dihedral than scale

Wing joiners test fit

Bottom dihedral brace needed replacement with less dihedral brace (top)
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Old 11-16-2015, 04:56 PM
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Kram. Sent you a pm.
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Old 11-16-2015, 07:54 PM
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Made spar bridge using two 1/4" aircraft ply on each side of the top and bottom spar

This spar bridge is a critical support for the wing where the wheel wells have to be cut out

Between upper and lower spars, install 3/8" balsa sandwiched between 1/4" ply spar bridges

Exact position to be determined by main wheel size and retracted position. I am building mine for 4.5" wheels
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Old 11-17-2015, 08:08 PM
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What I like about this system is it makes the wing tips rock-solid with the center section
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Old 11-24-2015, 08:47 PM
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Inboard aileron hinge

Push bushing through hinge bracket, then use thin CA to secure bushing

Be sure piano wire will go through straight before CA
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Old 11-24-2015, 08:51 PM
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Use sharp blade to cut bushing flush with lite ply

Add 1/64" spacer, then aileron end cap to give clearance after 1/64" spacer is removed
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Old 11-24-2015, 08:55 PM
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GoldNRod #517 yellow makes great bushing

Piano wire .092 fits ID inside yellow. Drill bit .232 makes good fit OD of yellow bushing
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Old 11-24-2015, 08:58 PM
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Inboard aileron hinge sandwich with light ply and 1/4" balsa between light ply caps with bushings
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Old 11-24-2015, 09:02 PM
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Hinge will look like scale 1/48 Monogram when completed with 3/32" balsa sheeting

Second is a photograph from a previous finished model
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Old 11-25-2015, 06:49 PM
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So is this online reporter thing going to lead to a youtube channel and film contract?

Haven't seen you online in awhile kram... Your profile says you haven't posted since 2013? technology at its best.

I could have sworn Dwayne was building a B17....
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Old 11-26-2015, 05:13 PM
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Foodstick!:

Well, there's an idea! A plane-building reality show!

Should get a minimum of 14 loyal viewers.

Naw, I don't think I'm doing the World a great service, but it seems a disservice to the Field of Human Knowledge that really skilled experienced pro's like Dwayne and Frank are out there building with no one learning from them

Leave it to you to be the only one who picked up on my oblique Bierce reference

I have been lightly active on RCU the last 2-3 years, at least a dozen posts per year, so your electronic tally must be false, somehow

I'm documenting Frank's 1/6 Wingspan build on rcscalebuilder, so that may have diverted some of my attention.

Hope to get that running again soon. As you know, Frank doesn't do much building during flying weather, so this recent round of wintry mix should get him jump-started

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