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Old 11-19-2008, 02:09 AM
  #2504  
Sky Sharkster
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Hello To Fazerdreamer + Murphy, Welcome to Wattflyer!
To Murphy, I agree with HoaRC, there are certainly easier ways to try electric R/C, but if you're determined to convert the Free Flight Cub, I'll offer some advice.
First off, is this the model you're considering?
http://aabt.co.uk/prd337-1120.htm
If so, it is on the large end of the "Micro" R/C spectrum, but a small and lightly-built "Park" flyer.
I would project the completed weight would be 5-7 ounces, of which 1/2 will be the completed airframe and half the R/C and power system. To fly successfully, you will need about 35 to 50 watts output.
There are 3 main concerns with converting a Free Flight in this manner. (1) Strengthening the structure for the additional weight and power.
(2) Selecting a power system and R/C system compatable with the (projected) weight and power output.
(3) Adding R/C controls, motor mounting and battery mounting areas, airflow for cooling the battery + motor, fabricating servo mounts and pushrods, etc.
Here is a long build thread I did on a similar (but smaller) FF to R/C conversion;
http://www.wattflyer.com/forums/showthread.php?t=33844 I've detailed the motor mount, servo tray, "Home-made" balsa + wire pushrods, landing gear reinforcement and general strengthening of the airframe.
I'm guessing you're located in the UK, if so, here's some suppliers of "Micro" gear and a few motor recommendations;
http://media.hyperion.hk/dn/motor/z17/
http://robotbirds.com/catalog/index....f983f415a06573
http://www.e-fliterc.com/Products/De...rodID=EFLM1130
The E-Flite brand is carried in the UK by BirminghamModelCentre, but they don't list this size. A call or E-Mail may confirm whether they can get it;
http://www.birminghammodelcentre.co....essMotors.html
The motor weight will be between 15-25 grams.
Batteries will be 2S (2 cell) or 3S LiPoly of about 400-500Mah. Battery weight will be about 15-24 grams.
You will need 2 "Micro" servos (assuming rudder, elevator and motor control) weight about 4-6 grams each.
A brushless speed control of (about) 8-10 amps capacity, weight 5-8 grams.
A four channel Micro receiver (very few 3 channels available), weight 3-7 grams.
A small 2 or 3 cell LiPoly charger.
And, of course, a transmitter compatable with the receiver.
Here are more Micro suppliers in the UK;
http://www.atomicworkshop.co.uk/catalog/index.php
http://www.falconmodels.uk.com/
http://www.indoorflyer.co.uk/index.asp
http://www.samsmodels.com/site/Catsectionf.html
Hope this helps! If you like, I can move this post to "Scratch + Kit Builders Forum", or you can start a thread there.
Ron
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