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RTF/PNP Philosophy

EDFhobbies philosophy on RTF and PNP EDF Jets

 

Stock EDF Jets:

 

At EDFhobbies we try and carry kits only, occasionally you will find some RTF or PNP jets from certain manufactures.  These products have been tested and deemed suitable and reliable enough for us to carry and sell as is with out upgraded electronics.  EDFhobbies’s main concerns are reliability and power at an affordable price that’s why we limit our product to certain RTF’s and PNP’s.

 

Concerns With Stock RTF/PNP’s:

 

Electronics Reliability:  Its no mystery that if you cruise around the Rcgroups forum under the Foamy EDF section http://www.rcgroups.com/foamy-edfs-377/ that your going to find numerous stories and complaints from customers stating that the electronics brought down there $200.00 plus edf jet.  Anything from faulty radio/rx systems, striped servos, dead esc’s, and poor assembly quality.   Buying a kit and supplying your own quality elcectronics could avoid all of these problems.  Supplying your plane with Hobbyking products is not the answer as well though; the quality is a little better than what comes in a kit from LX/Sky Flight Hobby, Starmax, or J-power it is along way from the answer.  Why you ask, Ducted fan systems put an enormous strain on the power systems, most of the setups require loads of amps and volts to drive the inefficient rotor to 45K rpms or higher to get the performance that a jet needs.  Buy your Hobbyking parts for Props only.

 

 Assembly Quality:  Assembly of your edf jet is another one of our concerns.  These jets are assembled with no concern for safety or reliability, which is very important in our hobby.  Under paid and over work employees does not produce a quality result, we being Americans know this from our early days of the American industrial revolution (no, I doubt u will find a thumb chopped of in the fuse of your jet “The Jungle”).  But a wing coming off in mid air or a carbon rod falling out is no secret.  Yes it a little more hassle but assemble the plane yourself or have us do it.

 

A list to protect your investment:

 

1.      Check all carbon rods in wing for proper glue

2.      Dbl. Check all control surfaces mainly the hinges

3.      Check battery trays and straps (flying upside down, loops, and rolls puts a lot of stress on heavy internal parts.  Keep them from flying out of the plane)

4.      NEVER EVER USE THE SUPPLIED GLUE FOR THE WINGS OR FUSELOGE use a well named epoxy.

5.      Check all control horns supplied with the kit, these parts often made to brittle and can break very easily.  We recommend replacing these horns with Hobbico or Great Planes parts.

 

 

Power/Motors:

 

Lets face it 95% of stock jets do not perform like jets they need a serious upgrade!  Do not be fooled for one second the videos you see of RTF products are NOT STOCK.  These planes are sent to the big 3 as kits only and they supply them with there own goodies.  These planes are flown on Spectrum radios or Futaba.. Never the own radio in the kit, never the motor or fan either.. just hoped up performance to get you to purchase a RTF so they can make loads of money with out your investment on their mind.

 

Motor Upgrade 70mm 4s kits:  Take a look at the kv rating you see on the stock motors supplied in these kits they range from 2700kv to 3000kv hardly enough kv or watts to provide jet like performance.  With the new battery technology increasing every month it seems, why not take advantage of this by upgrading to higher kv motors.   For some reason the RTF’s and PNP’s have been stuck in this range for the last couple of years.

 

·        If you plan on upgrading the motor but are still using the stock fan please balance your rotor, we are in the process of developing a video that demonstrates this process.

·        Also be aware that all stock kits use 4.0mm adapters and require motors with 4.0mm shafts.  We carry a full line of 4.0mm motors, yes we prefer you to upgrade to a wemo fan but we understand that you are on a budget as well. If you do upgrade to a wemo then 3.17mm is the stnd. size.

 

ESC Upgrade:  This is the heart of the plane and is the number one most important upgrade possible, loss of power brings down not only real planes but also rc planes.  It is an absolute must to use a wattmeter to check the amps your motor pulls and to make sure it can run on the required voltage that the motor needs so you can pick the right ESC.  We are trying to test several combinations but there are way to many fans on the market to test them all, so please use a wattmeter when in doubt.  We only sale named brand ESCs, If your not going to spend the money on a Castle product then ZTW and Hobbywing are proven quality substitutions.  A long story short if you upgrade the motor you will need a new ESC, this goes for replacing the fan unit as well.  A good rule of thumb is to look at the motor and see the max amp rating then choose an esc with 10 to 15 amps more than what the motor requires.  If you plan to use an EXTERNAL BEC, not the one supplied on the ESC, then you can choose one with in a couple amps of your needs.  You will need to disconnect the middle wire on the lead that plugs into the channel 3 on the receiver, by not using the supplied BEC the esc can handle a few more amps and will not run as hot.  It is also a good idea to have at least 5 MPH of air movement to cool the esc.  An external BEC is always a good idea, even if the esc has one.  If the ESC goes out you will still have control surfaces, gear, and flaps this may be the difference between a safe emergency landing and an uncontrolled crash.

 

 

Servo Upgrades:  It’s hard to believe but the servos supplied in these kits sell for about 30 cents each to plane manufactures like LX, Starmax and J-power.  They are under torque and have cheap plastic gears that strip very easy.  We have found budget quality servos that perform as well as futaba, JR, and Hitec that we believe in.  EDFhobbies recommends that you use metal gear servos in retracts and FULL STAB EVELEVATORS and TAILERON setups.  There is a tremendous amount of torque needed to move these functions.