BB J3 Cub - Page 20 - RC Groups
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This thread is privately moderated by BlueFFF, who may elect to delete unwanted replies.
Nov 19, 2012, 11:05 PM
Up in smoke!
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Dec 18, 2012, 03:06 AM
Registered User
Dear ALL

I print the design and i will start to proceed ,so first of all i want to thank BlueFFF on the design Also i need advice as i am from Egypt and we didn't have FFF or blue core foam we just have depron with paper on both side with thickness 5 or 3 mm which will be more heavier so i will edit the design to use servo tray and fuselage formers instead of Mono-Block to decrease the wight also cause we haven't Mono-block foam so i need the dimension for firewall that i will mount my Turnigy L2206A-1650 Brushless Motor (130w) and how i will center the motor on it.
Jan 23, 2013, 06:45 AM
Registered User


Hadydodo, looks like this thread has died. Your firewall would be 2"square, just center your motor in that.
Jan 29, 2013, 12:08 AM
Registered User
I just stumbled on to this thread, found it in a search because I am planing on making a Cub from scratch myself. Spent a good chunk of today laying it out, and guess what? My plans look almost identical to yours I could have saved myself a few hours and just scaled your plans up to the size I want
Jan 29, 2013, 06:32 PM
Registered User

Now The Fun Cub

I've built the J3 and still fly it today. It is a great plane to learn on. But I just had to play around:
I tried to imitate the Multiplex Fun Cub
Stretched the J3's fuselage and made the monobloc 3" wide, tapered in the front and then sheathed with the $tree ala SeaBB42.
Modified the profile of the tail
Went with a full house 60" wing modded from Experimental Airlines' design with built in ailerons and flaps tipped with carved foam ends.
All except the carved ends and the monobloc is $tree and packing tape
Dual spars in wing, does not break down into 2pcs.
carbon pushrods and wing supports
4 1/2" Dubro wheels with hole drilled to lighten ( not that it helped, almost 4 oz. in lg alone, I just couldn't see $25 plus s/h for the Multiplex gear)

I'd like to say it is as light as Multiplexes but it isn't so probably will not float like the original but I had to try. No maiden yet due to weather.
All electronics from HeadsupRc of course! should swap into the Multiplex if this one's a dog.
EMP 3536 1100kv motor
45a esc w/ 6a switching bec built in
2200mah batt
MG servo E&R
43 oz AUW
Feb 02, 2013, 03:52 PM
Up in smoke!
BlueFFF's Avatar

Looks great, but seems heavy. You have plenty of wing span though, so let us know how it performs.

Feb 10, 2013, 07:14 PM
sbjct hawk's Avatar
hey blue .
can i build the plane with dollar tree foam board as long I scale up the power plant (because it might be a bit heavy )
Feb 11, 2013, 11:27 PM
Up in smoke!
BlueFFF's Avatar
You can build with dollar tree foam board at the original plan size and motor. Just soak the foam board in water and peel off the paper. After building you just need to put a layer of packing tape or actual wing covering to help cut down on road rash. Read thru the blog and you will see people have built it in a couple of ways. Also take a look thru the Blue Baby thread for more construction ideas.

Feb 12, 2013, 03:26 PM
sbjct hawk's Avatar
Will do thanks
Feb 12, 2013, 04:20 PM
Registered User
thanks for answer me davovinch
Feb 19, 2013, 10:57 AM
sbjct hawk's Avatar
well here it is just waiting on the motor ,esc, and reviver
Feb 19, 2013, 02:06 PM
Up in smoke!
BlueFFF's Avatar
Looks good!
May 19, 2013, 03:01 AM
Registered User

Re: Advice please


i finally finish the plan and test it yesterday but it was uncontrollable ,as i make 2" dihedral and use aileron but it hasn't any effect so please advice should i remove aileron and just make it RET plan or make anther wing with no dihedral with aileron also advice as i have tail heavy problem although i put died wight to eliminate it ,so i suggest to increase nose length by 2 " is it good ideal .
May 19, 2013, 02:57 PM
Registered User

my plan

My plan Pic
May 21, 2013, 03:38 AM
Registered User
PLZ answer me

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