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Old Apr 03, 2009, 06:22 PM
Up in smoke!
BlueFFF's Avatar
Greenville, TX
Joined Jun 2007
627 Posts
Build Log
BB J3 Cub

Presenting the BB J3 Cub. This plane was my entry in the BB Tribute Contest, but was not finished by the dead line. In fact it has taken me a 3 months since then, because of more pressing issues. The plane flys better than my 42" RET BB, I built this one with ailerons, my first. I have a vid of it flying for about a minute before the batteries ran out of juice and I hit a tree. Remember to always charge your batteries before you go fly.

Here is the vidio of the maiden flight.
http://www.rcgroups.com/forums/showthread.php?t=1032837

Ok, I finished the plans for the BB J3 Cub. See below.


The specs are;

Wing span = 44"

Wing area = 413.5 square inches

Fuse length = 29.5 inches

Motor = Emax 2822, 1200kv
http://www.hobbycity.com/hobbycity/s...runner__1200kv

Prop = 9x3.8
http://www.hobbycity.com/hobbycity/s...ropeller_9x3.8

Esc = Simple 18 amp
http://www.hobbycity.com/hobbycity/s...Simple_18A_ESC

Receiver = 9 gm, 6 channel
http://www.bidproduct.com/part/Produ...RYSTAL_40.html

Servos = 9 gm, qty 3
http://www.hobbycity.com/hobbycity/s...ec_Micro_Servo

Battery = Lipo, 1000 mAh, 20c
http://www.hobbycity.com/hobbycity/s...idProduct=6470

Wheels = D75xH18mm
http://www.hobbyking.com/hobbycity/s...5pcs_bag_.html

Landing Gear = Made from bent coat hanger

Auw = 19 oz.

Construction material = Dow PBIII fan fold foam


The BB J3 Cub uses the same monoblock construction as the BluBaby, so for assembly instructions I would suggest you check out that build thread.

http://www.rcgroups.com/forums/showthread.php?t=681556

If anyone wants to build one of these and has a specific question, just let me know here and I'll do my best to answer it.

BlueFFF
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Last edited by BlueFFF; Aug 05, 2011 at 08:25 PM. Reason: Added some build pics.
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Old Apr 07, 2009, 09:06 PM
we spozed ta be tite!
fr0g_D's Avatar
Nowata, OK
Joined Aug 2005
159 Posts
That is one sweet lookin little bird! I would really like to get my hands on a set of plans for it.

Nice Job!

fr0g_D
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Old Apr 09, 2009, 09:34 AM
Up in smoke!
BlueFFF's Avatar
Greenville, TX
Joined Jun 2007
627 Posts
Thanks,

I think I will have time to finish the plans this weekend and get them posted.

BlueFFF
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Old Apr 09, 2009, 09:45 AM
we spozed ta be tite!
fr0g_D's Avatar
Nowata, OK
Joined Aug 2005
159 Posts
Sweet man I can't wait.
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Old Apr 11, 2009, 09:46 AM
Long time newbie
USA, TX, Katy
Joined Nov 2006
976 Posts
Really nice, clean build. Did you show it off over at the BluBaby thread? If you haven't, you really should.

Mike K
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Old Apr 11, 2009, 07:34 PM
Up in smoke!
BlueFFF's Avatar
Greenville, TX
Joined Jun 2007
627 Posts
Thanks hemak,

I plan to put a post on the BluBaby thread and the old tribute thread after I get everything into my blog. A little less pressure this way. I finished the plans, so I just have to make all the pdf files for them. It's supposed to rain tomorrow so I will get it all together and post it then.

BlueFFF
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Old Apr 12, 2009, 02:58 PM
John 3:16
Daddy-O's Avatar
Dom. Rep.
Joined May 2003
3,825 Posts
You did a very nice job on those plans (very thorough). I have a question though. What does "D size" mean on your file name above? Does it need to be scaled to be 44"? Thank you for posting the plans. It looks like a very good flyer in your video. Congratulations.
Daddy-O
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Old Apr 12, 2009, 03:09 PM
AMA 14680
Foamenator's Avatar
Northern Nevada
Joined Mar 2007
1,581 Posts
Blue... Great job on the Cub. You may have to build a few more as you can't have too many cubs. Bob
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Old Apr 12, 2009, 03:22 PM
Up in smoke!
BlueFFF's Avatar
Greenville, TX
Joined Jun 2007
627 Posts
Daddy-O,

D-size drawings are 34" wide x 22" high, so if you have access to a large format plotter you can print it out at 1:1 on two sheets of paper. I have one at work, but only printed it out at 8.5" x 11" for reference and used the tiled pdf to make my cub. I wanted to test the tiled version of the plans since that is what most people will use.

Foamenator, Thanks for the complement. I will probably build a 34" kfm2 version for use with a blue wonder motor.

BlueFFF
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Last edited by BlueFFF; Apr 12, 2009 at 05:38 PM.
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Old Apr 12, 2009, 03:54 PM
we spozed ta be tite!
fr0g_D's Avatar
Nowata, OK
Joined Aug 2005
159 Posts
Killer man thanks alot for hookin us all up with such detailed plans.
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Old Apr 12, 2009, 06:35 PM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,492 Posts
Blue,

What did you use for paint. It looks very nice and opaque.

BTW I downloaded the plans for the future.

Ken
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Old Apr 12, 2009, 06:47 PM
Up in smoke!
BlueFFF's Avatar
Greenville, TX
Joined Jun 2007
627 Posts
dz1sfb,

I used apple barrel craft paint form Walmart, bright yellow. It is very opaque. I had to use several coats to cover the blue evenly. Next time I will put on a white base coat to see if that will reduce the number of coats required. I mixed it 50/50 with rubbing alcohol, each coat dries fairly quickly that way. Also need to try to remove as much of the black printing from the foam as possible before painting. It rubs off of the packing tape very easily, so you should try to scuff the tape up with sand paper before painting.

BlueFFF
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Old Apr 13, 2009, 10:03 AM
A real WingNut
j4ck4's Avatar
United States, OK, Tulsa
Joined Dec 2008
922 Posts
Downloaded plans this is one I will build this summer, After my wife and I get a house.
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Old Jul 13, 2009, 11:00 AM
where did my wings go?
estlin76's Avatar
livingston, tx
Joined Jun 2009
103 Posts
Very nice plane, must have one, off to the land of foam! Thanks for the plans !
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Old Jul 13, 2009, 11:12 AM
Up in smoke!
BlueFFF's Avatar
Greenville, TX
Joined Jun 2007
627 Posts
estlin76,

Please post some pics when you finish your plane and tell us about your experience with it.

Thanks,
BlueFFF
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