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Old May 09, 2015, 06:38 AM
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Build Log
A-3 (Was B-66) Foam EDF Build Project

Hi,

PLEASE NOTE: Due to the simpler flap setup on the Navy A-3 Skywarrior, I'm changing the model from B-66 to A-3. In most other ways, the aircraft are essentially the same.

I’m starting this build thread to document my A-3 Skywarrior project. When it came into service, it was the heaviest aircraft operating from aircraft carriers. Below is an image of my creation of its cousin, the B-66, in the Phoenix flight-sim program. I created the B-66 before deciding to build a foam A-3 instead of B-66.



This is my first scratch build of an RC airplane and the first time I’ll be working with foam. So, the process will be slow as I research best practices for each stage of the build.

For a brief video about the project, including B-66 Phoenix flight scenes, go to :

B-66 "Destroyer" RC Model Planned Build and Phoenix Test Flight (7 min 57 sec)


The project has four main phases:

Phase 1. Preliminary research and creation of a Phoenix B-66 flight-simulator model to test and refine the design’s flight characteristics.

This step has been completed. Attached are two files:

-- One is a folder containing the files needed if you want to fly the B-66 model in the Phoenix flight sim program.

-- The other is the B-66 model I created in SketchUp to export to Phoenix Builder. Jacques Brault gave me permission to use his X-Plane B-66 model for that purpose. SketchUp is free, if you wish to view this model from all angles.

Phase 2. Extensive research culminating in the development of the plans for the RC model, including a 3D rendition in SketchUp. (IN PROGRESS)

Phase 3. The build, documented with still images and/or video.

Phase 4. And, of course, the test flights, which, for better or worse, will be captured on video.

Below are the model’s basic specs, as of now:

Material . . . . . . . . . . . . . . . . . . .Mostly foam, supplemented by balsa, etc. as needed.
Wingspan. . . . . . . . . . . . . . . . . .60 inches
Weight . . . . . . . . . . . . . . . . . . . 60 - 80 ounces (give or take)
Propulsion. . . . . . . . . . . . . . . . .Two 70mm ducted fans
Flaps . . . . . . . . . . . . . . . . . . . . .Yes (Fowler-type contemplated)
Retractable gear . . . . . . . . . . . .Yes
______________________________

Below are links to some RCGroups posts related to this project. Some chronicle discussions generated by questions I’ve raised. My queries show an evolution in thinking as I have received more input. I will update this section as relevant posts go online:

“Would Like First Impressions of B-66 Project” (my query, March 30, 2015)

"How Much Does Acrylic Paint Weigh?" (my query, April 3, 2015)

“Suggestions for Building a B-66 Bomber” (my query, April 4, 2015)

“Recommendations for Light-Weight Retractable Landing Gear” (my query, April 22, 2015)
This thread gets into wing-chord and thrust issues as well.

“RC Groups: A3d Skywarrior, The Whale Buildthread” (GGRN, Nov., 2008)
I expect GGRN’s build thread to be very helpful, even though it ends suddenly without explanation before the project is completed—not an omen, I hope.

"Foam-Safe Spray Paint" (Discussion) (Reactivated by me May 14, 2015 .)

"Attitude Adjustments (of Models, That Is)" (my query, May 15, 2015)

"Plastic Nose Section?" (my query, May 16, 2015)

"EB-66 'Bat 21' @ 1/8th Scale" (J Morgan, May 23, 2015)

"Performance Difference Among Different Flap Types" (my query, May 27, 2015)

"Would Like Feedback on Fowler-Flap Design" (my query, May 30, 2015)

"Anyone Have Experience with/Info on the Dynamic Power (RC Lander) 64mm EDF?" (my query, June 1, 2015)

"Feasibility of Cullip Fowler-Flap Design for A-3 Skywarrior?" (my query July 3, 2015)

______________________________

Please feel free to offer suggestions, insights, support and whatever else you think might be constructive.

Bill
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Old May 10, 2015, 10:32 PM
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Awesome check also Chris Golds build as he done one of these a while back.
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Old May 10, 2015, 10:43 PM
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Couldn't find anything on Chris Golds and the B-66 when I did a search. Any suggestions?

Bill
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Old May 13, 2015, 12:19 AM
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http://gb.trapletshop.com/content/im...autour-27.jpeg

Similar but not a B66
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Old May 13, 2015, 09:05 AM
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Interesting. With the bicycle landing gear, it kind of looks like a downsized version of the B-47.
I found more information at http://en.wikipedia.org/wiki/Sud_Aviation_Vautour.

Having a 50-foot wingspan, it's classified as a fighter bomber, versus the 72-foot-wingspan B-66 light bomber.

Nice looking plane. Here's a link to a really classy-looking one:
http://www.airteamimages.com/sud-avi...ce_199814.html

Thanks,
Bill
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Old May 14, 2015, 07:47 AM
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Bill,

Great flying sim model - gonna be fun to watch you build and fly the real thing.

Cheers, rick p
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Old May 14, 2015, 09:23 PM
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Thats a french Vatour not a B-66
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Old May 14, 2015, 09:49 PM
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http://gb.trapletshop.com/copy-of-do...-3b-skywarrior

http://www.magazineexchange.co.uk/el...999-issue.html

My mistake it's a RA-3B Skywarrior
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Old May 14, 2015, 10:10 PM
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Thanks for the tip, but designing the plane will be half the fun. Wouldn't want to miss it. And my plans won't cost anyone anything.

Bill
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Old May 15, 2015, 01:22 AM
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Be a good one since ya using Podded engines make it easier to service.
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Old May 15, 2015, 07:47 AM
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Re: "Be a good one since ya using Podded engines make it easier to service."


Good thought.

On the other hand, I'll have to be careful to land with the wings level, or I'll scrape one of those nice nacelles right off. I'm thinking of having some kind of break-away or flexible attachment--rubber bands, maybe--that will minimize damage in case a nacelle comes in contact with the ground.

Bill
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Old May 15, 2015, 08:34 AM
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Followup to: "... designing the plane will be half the fun. Wouldn't want to miss it. "

However, I'm not so rigid that I won't be taking ideas from GGRN's build thread, starting at about http://www.rcgroups.com/forums/showp...3&postcount=31. Great step-by-step images of his A-3 Skywarrior build. I'll have a chance to learn from a master. (I won't let my Air Force buddies know that I borrowed from a Navy design!)

Bill
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Old May 28, 2015, 09:45 AM
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I have noticed several people interested in the B-66. This is a straight forward edf project
which should not present too difficult a learning curve for newbees to using epoxied and
glassed Blue DOW Polystyrene and an internal fuselage struss to carry the wing loading,
retracts, weapons bay with plenty of room for batteries.

Remember bigger really does fly better when it comes to EDF.

Look forward to watching your project move forward. What have you done relative to a
planset you will upgrade in scale detail and size?

GGRN's project is a good place to start for a total build up as its origins are in a card stock
model build out. Smaller models can easily be built this way, by typically scrafice size as it
quickly gains mass/weight.

Creating a centerline telescoptic crutch permits the entire model to be cosmetic as far as
its shape is concerned. Bulkheads support retracts, fuselage spoilers/air brakes, rudder &
horiz stab mechanics.

Wing halves plug into fuselage and stay attached, at the root, but removable if needed. the
remaining wing outboard the engine nacelles detachable for ease of transport. The retracts
remain down for ease of maneuvering the model.

You are correct that this is a virtual parity of the B-47, but more deployable world wide on
aircraft carriers.

Looking forwrd to your build.
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Old May 28, 2015, 10:11 AM
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Welcome, FliteMetal. I will be looking forward to your input as the project progresses. I've had mixed reviews about whether the B-66 is a good place to start for a first build. I'll eventually find out who's right.

Re: "What have you done relative to a planset you will upgrade in scale detail and size?"


I'm still studying various build aspects. Right now, I'm focused on what kind of flaps to use. Once I have all my ducks in a row, I'll start working on detailed plans, which, of course, I'll post here.

Bill
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Old May 28, 2015, 11:59 AM
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What kind of flaps to use...?

Quote:
Originally Posted by BSquared18 View Post
Welcome, FliteMetal. I will be looking forward to your input as the project progresses. I've had mixed reviews about whether the B-66 is a good place to start for a first build. I'll eventually find out who's right. Re: "What have you done relative to a planset you will upgrade in scale detail and size?" I'm still studying various build aspects. Right now, I'm focused on what kind of flaps to use. Once I have all my ducks in a row, I'll start working on detailed plans, which, of course, I'll post here. Bill
The USN/USMC A3 is the same airframe is it not?

Bill, I am confused. What other way would you do the flaps than the way they
functioned on the 1:1? Do you have a T.O. technical drawing for the B-66 ? At
a minimum you will need to have one or more as reference beyond photos as
all the functional mechanics are "beneath" the visible skin of the aircraft.

The flap can be driven from a linear servo within the engine pylon. It is huge
and contain a linear servo for the flap along with the EDF Nacelle blade onto
which EDF is mounted with its ESC.
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