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Free Flight to RC Conversion

Old 07-11-2011, 01:23 AM
  #1  
smooth operator
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Default Free Flight to RC Conversion

one of the main reasons i got back into the hobby was to do a lot of conversions from the guillows and dumas FF kits to RC. i know this is very challenging but the engineering student in me just keeps saying "GO FOR IT!" i would rate my kit building experience to intermediate, i built a few dumas kits and countless guillows kits and wish i still had all of them. my main concerns are movement of CG, what equipment to use (motor, ESC, rx, servos, linkages/pushrods, etc.), and what covering to use. any advice? i'm planning on picking up some of the said kits in the 18-3-" wingspan range so the gear i will probably put on board will be a lot of micro stuff. any advice before i go through with this crazy venture?
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Old 07-11-2011, 01:48 AM
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kenchiroalpha
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Hi
Have fun
F/F aircraft are a hoot either converted to rc or not
Once you have a specific model in mind it will be easier to plan a setup
Heres some of mine both old ones and new
Do enjoy
Take care
Yours Hank

Last edited by kenchiroalpha; 08-15-2011 at 02:40 AM.
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Old 07-11-2011, 09:50 AM
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JetPlaneFlyer
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Nothing crazy about it at all. i also have a few Dumas kits in my stash of kits which i intend to convert to R/C one of these days...

My advice would be to keep everything very lightweight. With the right RC gear it should be possible to build an electric RC model within a few grams of the flying weight of the original rubber power models, and for me that's the way to go. If you start adding larger motors and larger batteries then the survivability of the lightweight stick built balsa airframe starts to become a big issue.

To keep weight down I'd go with tissue, like they were meant to be covered, or possibly one of the very lightweight polyester heatshrink tissue type coverings (e.g. Polyspan). Standard heatshrink films are a bit heavy and shrink with too much force for these lightweight structures.

Steve
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Old 01-07-2020, 10:56 PM
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foxch0844
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Exclamation Vintage Berkley Kit

My kids just gave me a 1948 Berkley kit, a Fairchild 24 with 36" wingspan, for my 73rd birthday. It is setup for rubber band flight but I would rather build it for electric RC. I had experience building kits (about 60 years ago) so construction itself is not much of an issue....except it has no ailerons and those will need to be fabricated.
My dilemma is that sizing motors and choosing props seems to be a factor of the finished weight of the plane. So I have a chicken-vs-egg problem. Can't know the weight of the motor, ESC, servos and battery until I get them.....and can't get them until I know what I need. Perhaps I am looking for this to be an exact science and it's not. The completed model is advertised to be 6 oz which sounds low to me. I am planning to skin with Ultracote. Since I can literally build the plane around the electric components I need to have parts to work with.
Any advice on how to proceed is appreciated.
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Old 01-08-2020, 09:06 AM
  #5  
CHELLIE
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Hi @foxch0844 Welcome to Wattflyers, I have been building CL, RC airplanes and Helis for over 50 years so I have a good idea what will work for you, here are some Power system parts for you that will work very very well. Hurry and order your parts, they may not be in Stock for very long, belive me on that one
Put your CG at 25% behind the front on the Leading Edge, thats a very very safe place to start from.

Motor 26X27 1200KV https://hobbyking.com/en_us/turnigy-...er-1200kv.html

esc https://hobbyking.com/en_us/turnigy-...ontroller.html

Battery https://hobbyking.com/en_us/turnigy-...lipo-pack.html

prop https://hobbyking.com/en_us/jxf-poly...-7x6-2pcs.html

servo - These are a great servo it all I use https://hobbyking.com/en_us/hxt900-m...-12sec-9g.html

Battery Charger -- this is a 12v powered charger, the 110v chargers seem to be out of stock, this charger is good enough for a 1300 MAH battery and less
and will allow you to charge your battery at the field https://hobbyking.com/en_us/turnigy-12v-2-3s-basic-balance-charger.

Last edited by CHELLIE; 01-08-2020 at 06:32 PM.
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Old 01-08-2020, 09:14 AM
  #6  
CHELLIE
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I listed a can brushless motor above, Dont use Bell motors, the motor wires like to vibrate and break on them and the motor mount likes to get loose and the motor will twist, breaking the motor wires at the motor.

mounting brushless motors - https://wattflyer.com/forums/showthread.php?t=39483

Building Ideas https://wattflyer.com/forums/showthread.php?t=55444
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Old 01-09-2020, 12:47 AM
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quorneng
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foxch0844
Chellie's recommendation look good.
The Berkley Fairchild 24 has a light weight construction (5.8 oz complete incl the rubber motor!) so it is best to keep the weight as an electric RC conversion as low as possible.
I also note Jet planes Flyer's earlier recommendation to avoid using normal heat shrink film. The original structure was intended to to tissue covered. Modern heat shrink films pull very tight so can over load the light weight structure and are significantly heavier than tissue.
Are you sure it will need ailerons? As a high wing with adequate dihedral it will manage fine on just rudder, elevator and throttle (RET). This will save both mods to the wing and some weight.
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Old 01-09-2020, 12:54 AM
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CHELLIE
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Talking YEP

Originally Posted by quorneng View Post
foxch0844
Chellie's recommendation look good.
The Berkley Fairchild 24 has a light weight construction (5.8 oz complete incl the rubber motor!) so it is best to keep the weight as an electric RC conversion as low as possible.
I also note Jet planes Flyer's earlier recommendation to avoid using normal heat shrink film. The original structure was intended to to tissue covered. Modern heat shrink films pull very tight so can over load the light weight structure and are significantly heavier than tissue.
Are you sure it will need ailerons? As a high wing with adequate dihedral it will manage fine on just rudder, elevator and throttle (RET). This will save both mods to the wing and some weight.
I agree with quorneng 3 channel will be just fine, give the rudder lots of throw and tissue paper, silk will work just fine, the light balsa construction might not hold up to modern heat shrink coverings.
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