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« on: February 25, 2012, 02:47:59 PM »
aimbug
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Hey guys i have bought a new house of balsa J3 piper cub 1/5 scale and have built it but its an nitro powered plane but i want to convert it to electric so i want to know which brushless motor is suitable for .046 engine.

this is the kit

http://www.houseofbalsa.com/store/store-type-tem.html?item=products:k-20&sid=00014tfToFZHJZIqj08w715

and this is my site where i uploded the pics

http://www.tarakntm.in/2012/02/piper-cub-j3-project.html

please help   
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« Reply #1 on: February 25, 2012, 03:44:25 PM »
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some thing looks wrong.... 52in wingspan and .049 engine....?? looks like it has a .49-.72 engine and the "0" is a typo....

by the  pics  i  think it is god for a .15-.25..

superb build...  Hats Off Hats Off
check the below pic to  sort things out....!

.46 - 500-600 watts

Capture.jpg
Re: My J3 Piper Cub From House of Balsa. 1/5 scale need help
* Capture.jpg (28.14 KB, 595x318 - viewed 438 times.)
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« Reply #2 on: February 25, 2012, 03:48:41 PM »
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thank you Smiley  Salute reall y helped
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« Reply #3 on: February 25, 2012, 11:22:19 PM »
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Couple of things
It is not a 1/5 scale. You are good with the engines suggested. i.e. .049 - .074 or equivalent electrics.
Thirdly and most importantly I have serious doubts about the wing center section joint. Your build did not cater for dihedral while gluing in the root ribs and hence when you have joined the two halves there is a gap which has been filled with glue in the hope that it will hold. It will not and you risk in flight failure of wing joint.
Suggest have it looked over by some one experienced to correct the situation. And I hope that the joint has dihedral brace.
 
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« Reply #4 on: February 25, 2012, 11:44:50 PM »
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sir ,

dont u think .049 is small compared to the 1.3m wingspan...??  Head Scratching

missed out that pic ...! nice observation..  Thumbs Up  looks like it is just standing on the two  sheets and missing the root rib.. Salute
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« Reply #5 on: February 25, 2012, 11:47:40 PM »
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Please check the AUW of the model as stated by the mfrs. Do not go with the wingspan alone.
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« Reply #6 on: February 25, 2012, 11:53:25 PM »
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680 gms...! seems fine... but  i would go  with a .10-.15...! .049 for a 2ch is fine....!

BTW... update  on the tiger moth  Drool ...! looks like the XUV500 was specially brought for that...!
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« Reply #7 on: February 26, 2012, 12:40:45 AM »
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.074 = 1.2cc
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« Reply #8 on: June 15, 2012, 12:24:06 PM »
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finally i got it...

http://loke.as.arizona.edu/~ckulesa/propulsion.html
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« Reply #9 on: June 15, 2012, 07:49:27 PM »
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Those are brushed motors and less efficient. Suggest you go with brushless and lipos
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