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Old Mar 27, 2013, 08:53 PM
Ken USA is offline
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Build Log

BBCC-2 Twelve KenUSA


I've decided to try a control line to RC conversion of popular 1954 plan.
http://outerzone.co.uk/plan_details.asp?ID=2028
https://www.rcgroups.com/forums/show....php?t=1842080
I intend to participate in the BBCC2

I figure I'll try to document every step of the process from model selection to flight.
I looked for a plane that could use a 370 or smaller powerplant, fit in my car, and look good. I like scale models, but really enjoy the freedom of design available today. So, I settled on Twelve.
I downloaded the plan from Outerzone, who attributed the submission to a poster here at RCG.
I followed the instructions on the site and downloaded Adobe, printed the plan as a poster and taped the 8-1/2 x11 sheets together. The plan is crystal clear and full scale.


Easy flier video
Matt Flying Twelve (4 min 59 sec)



Extreme flight video
CLIP0016 (7 min 1 sec)


Maiden flight
CLIP0012 (8 min 21 sec)


Ground handling pre maiden
CLIP0005 (0 min 49 sec)
Last edited by Ken USA; Aug 31, 2013 at 07:26 AM. Reason: I mistakenly referred to the plan as a kit
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Old Mar 27, 2013, 10:05 PM
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OK, you got two threads. Which one ya gonna use for the contest?
Old Mar 27, 2013, 10:16 PM
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The plane was designed for a Fox.29 engine, which I'm guessing could weigh as much as 10 oz. with fuel tank. The plan also shows 2 3/8x1/2 x 5-3/4 beams to mount it on.
Last edited by Ken USA; Mar 27, 2013 at 11:02 PM.
Old Mar 27, 2013, 10:54 PM
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Old Mar 28, 2013, 05:31 AM
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Looking at that I'm surprised it doesn't have linked flaps/elevator. Given the wing section and overall appearance, it certainly looks like a stunter. That would certainly have made arranging ailerons a lot easier.

Pete
Old Mar 28, 2013, 02:47 PM
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I thought the build threads were supposed to be labeled BBCC "2"?
Old Mar 28, 2013, 03:56 PM
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Oversight. Can a thread be renamed?
Old Mar 28, 2013, 06:46 PM
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Yes... edit Post 1.. then look for a "go Advanced" button... once in advanced edit, you can change such things.
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Old Mar 29, 2013, 06:49 AM
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Next I printed a second copy of the plan to cut templates from. I think I'll use rubber cement to hold the fuse templates in place while I cut, sand and fit them in place.
For the wing ribs, I'll make a thick plastic template that I can reuse and keep for subsequent projects.
Old Mar 29, 2013, 08:43 AM
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Quote:
Originally Posted by Ken USA View Post
Next I printed a second copy of the plan to cut templates from. I think I'll use rubber cement to hold the fuse templates in place while I cut, sand and fit them in place.
For the wing ribs, I'll make a thick plastic template that I can reuse and keep for subsequent projects.
This stuff works really well for templates to balsa...It's reposition-able and does not leave a mess on the balsa.
Old Mar 29, 2013, 08:46 AM
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I agree with the spray adhesive. On my Blackburn Skua, the scaling called for 3/32 bulkheads. After some thinking (a misdemeanor in most societies), I tried leaving them at 1/16 and leaving the paper on them. They have worked very well and were much easier to cut.
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Old Apr 01, 2013, 11:36 PM
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I've decided to access battery via a bolt on wing. Servos and receiver as well.
The plan shows a very stout fuse, so I will put it together to meet my needs and lighten it up after I'm satisfied with strength, access, etc.

I'm concerned about CG, so the battery will have plenty of room fore and aft.
Old Apr 04, 2013, 07:25 AM
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One of the reasons I chose Twelve is to find a reliable fuselage design that I can try different airfoils on. I think I'll build a reusable fixture to hold fuse formers for shaping and gluing fuse together.
Old Apr 04, 2013, 09:43 AM
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Ken,
What sort of power set-up did you have in mind for this model? I see the original was 44" span and that you made mention of a 370 'or less' motor. What flying weight are you anticipating?
Just trying to get a clear picture of what you have in mind because it's the sort of model I'd be aiming for at least 60 watts/lb to feel comfortable with.

Pete
Old Apr 04, 2013, 10:25 AM
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Himax 2025-4600 10x4.7 prop will be my first try. AUW not even a good guess yet.


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