Piper J-3 Cub - 44" Wingspan

Started by findvikas, November 23, 2010, 12:01:55 PM

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findvikas

Call me crazy if you like but I just love this plane, while I could not do the maiden of my Su-31 last weekend I thought I would take 2 for maiden instead of 1 as I have some free time till 4th December to really build the models.

I used this plan - http://www.rcgroups.com/forums/showthread.php?t=1028141

Cut it on 6mm depron - Thanks Foamy... I got finished with 2 so will ping you when I need more :)

So far the fuse is completed and gave it nice finish using sandpaper..I used normal thermocoal inside for strength.

Here are pics...  (other two planes for size comparison) should be a good flyer

Planned Electronics:

Motor: 1200KV - http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=5354
Prop: GWS 7x6 - http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=10057
ESC: HK 25-30a - http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6460
Battery: not really sure... I dont have a spare battery with big power... max I have 610mah 3S... might try that... or I will get a 3S 1050mah
Servo: HXT900 - I have tons of that
Gyro: H401B - Yeah I am planning to put a gyro for rudder... want it to be stable in heavy wind too.


Lets see how this goes. Comments are welcomed and appreciated :)

foamybuilder

Looks great and it looks huge..
With that motor and 7x6 you wont get enough thrust. ( I think I had this in my Red trainer :D It was severely underpowered, though it had other problems) 
Regarding Gyros, what I had read in rcgroups was If you are using a gyro,mixer,servo with a plane. Make sure to use all from the same company. Anyway I havent yet been able to successfully use a gyro with the plane. Lost two servo's till now when used with gyro, not sure whether its coincidence.

findvikas

I tried to make sure I dont oversize the fuse's width... your plane had most of the thrust blocked by the fuse I guess... still lets see how it goes. Gyro are optional... will add them after a successful test flight only

foamybuilder

It was cessna which you saw which had oversized fuse, not the trainer  :giggle:

findvikas

hehe... I see. Hey do you have any local source for prop saver... I ran out of them...

rajathv8

At this rate you are going to run out of space at home buddy :D nice one :) 4th model you made since i met you a month back! +one HK 450.

findvikas

lol... yeah... I was thinking where will I keep this one :) I think this is high time I think about modular design... plug n play kind of..

rajathv8

You planning on fixing the wing or attaching it with rubberband like ashok? Fixing the wing will cause transportation prob i guess.

findvikas

no way, I cannot fix it. specially for this size.

findvikas

Awright... I got a little surprise...

I missed my sleep for this, and Rajath you cannot complain if this is another yellow model in my collection. :) Still some work pending on fuse like Lightning & Fake Engine. Only the wings are left from being colored as I ran out of carbon rods.

foamybuilder

Oh no...What r u up to...opening a factory  :banghead:

rohitgupta322

Be Inquisitive

findvikas

Status update:

So the fuse is complete.. 99% just some touch up here and there and a fake engine mount pending.
The motor mount is build using some ply board and drilled 4 holes to screw tight the motor.
The wing is complete with airfoil shape... LE & TE shape is pending using sandpaper.

Here are some pics..

findvikas

I am planning to put the servo inside the fuse and let the control rods stay inside fuse for the maximum part... they will come out just below the elevator wing and control the elevator & rudder. Ailerons servos will be mounted on the wing itself.

foamybuilder

What is the expected AUW? Will it be ready by saturday....

findvikas

I need some carbon pushrods 3mm, if you can lend me then it can be ready.. I took friday off from office so will work on this guy but without pushrods I cannot finish the wing. If nothing works then I will go to RCDhamaka to get them.

AUW... will try to keep it under 500gm but rest bhagwan malik :)
I want to give it enough strength and detailing.. I could compromise on 100gm extra weight and can put a bigger motor if required.

atul_pg

Hi Vikas,

As you mentioned right now, that  you would like to keep the servos inside the fuse. Am afraid it would be very hard to do so if you have already sticked the fuselage.. In btwn my blue baby has the same design as yours.:)

cheers

foamybuilder

Quote from: findvikas on November 25, 2010, 04:23:51 PM
I need some carbon pushrods 3mm, if you can lend me then it can be ready.. I took friday off from office so will work on this guy but without pushrods I cannot finish the wing. If nothing works then I will go to RCDhamaka to get them.

AUW... will try to keep it under 500gm but rest bhagwan malik :)
I want to give it enough strength and detailing.. I could compromise on 100gm extra weight and can put a bigger motor if required.

Dont unnecessarily spend money for carbon fiber for pushrods:D. Once cut you cant reuse it for wings.
Use knitting needles number 14. It comes to just 3grams more.

findvikas

I gave the servo a dry fit and yeah I agree it wont be that easy but if done properly will keep the beauty of the plane alive :)

Yeah... actually the plan that I am using is also a BB plan.. I see you are using 2212/13 how much thrust does it give and what is AUW for BB ?

findvikas

#19
Quote from: foamybuilder on November 25, 2010, 04:31:26 PM
Use knitting needles number 14. It comes to just 3grams more.

this is for support for wings and I doubt knitting needles come in 20" size :)

findvikas

for pushrods I will probably use 2mm as the rods will stay inside the fuse and should stay safe inside.

foamybuilder

#21
Quote from: findvikas on November 25, 2010, 04:38:41 PM
this is for support for wings and I doubt knitting needles come in 20" size :)

You asked for 3mm carbon fiber pushrods in your post, so I thought its for pushrods.
I dont have 3mm tubes, I have rods. Vinay must be having some tubes.

findvikas

I think I can use rods, what do you use to support the wings ?

foamybuilder

I use tubes, some how I feel rods tend to bend more than tubes in midflight.

rajathv8

Hey you have done an awesome job man. Not complaining about the yellow :D Cool :) :) Will try to drop by your place tomo.