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Old Apr 03, 2009, 07:22 PM
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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.
https://www.rcgroups.com/forums/show....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.

https://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
Last edited by BlueFFF; Aug 05, 2011 at 09:25 PM. Reason: Added some build pics.
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Old Apr 07, 2009, 10:06 PM
fr0g_D is offline
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we spozed ta be tite!
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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
Old Apr 09, 2009, 10:34 AM
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Thanks,

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

BlueFFF
Old Apr 09, 2009, 10:45 AM
fr0g_D is offline
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we spozed ta be tite!
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Sweet man I can't wait.
Old Apr 11, 2009, 10:46 AM
heymak is offline
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Long time newbie
Really nice, clean build. Did you show it off over at the BluBaby thread? If you haven't, you really should.

Mike K
Old Apr 11, 2009, 08:34 PM
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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
Old Apr 12, 2009, 03:58 PM
Daddy-O is offline
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John 3:16
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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
Old Apr 12, 2009, 04:09 PM
Foamenator is offline
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AMA 8614
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Blue... Great job on the Cub. You may have to build a few more as you can't have too many cubs. Bob
Old Apr 12, 2009, 04:22 PM
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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
Last edited by BlueFFF; Apr 12, 2009 at 06:38 PM.
Old Apr 12, 2009, 04:54 PM
fr0g_D is offline
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we spozed ta be tite!
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Killer man thanks alot for hookin us all up with such detailed plans.
Old Apr 12, 2009, 07:35 PM
dz1sfb is offline
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Ken's CAD Models
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Blue,

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

BTW I downloaded the plans for the future.

Ken
RCG Plus Member
Latest blog entry: Mini H Quad Project
Old Apr 12, 2009, 07:47 PM
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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
Old Apr 13, 2009, 11:03 AM
j4ck4 is offline
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A real WingNut
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Downloaded plans this is one I will build this summer, After my wife and I get a house.
Old Jul 13, 2009, 12:00 PM
estlin76 is offline
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where did my wings go?
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Very nice plane, must have one, off to the land of foam! Thanks for the plans !
Old Jul 13, 2009, 12:12 PM
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estlin76,

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

Thanks,
BlueFFF

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