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3CH. R/C HUGHES DEFENDER YD-911 COAXIAL HELICOPTER

3CH. R/C Hughes Defender YD-911 Coaxial Helicopter, retail $72.98
Manufactured by (Unknown)
Last updated 07-14-12

This isn't a flashlight, household lamp, Christmas light set, or other thing that glows, but it *DOES* have a bunch of LEDs on the front and back of its fuselage, so what the hey.

This is only the thirteenth R/C helicopter to have graced these pages (out of at least a thousand other products) over the last eleven-plus years this website has been online, so please play nice and don't bite my head off to tell me that I forgot some important detail.

I love things that fly; that's why I took the bate (I saw it on Ebay not that long ago) and also why I added a seperate section titled "PRODUCTS DESIGNED TO FLY" on my website a number of years ago. I was also attracted to three things that this heli has that many others don't...

1: It's much larger than any of the "micro" helis I have flown before (actually, just a tick smaller than the Syma S031G R/C Coaxial Heli) -- I specifically wanted a larger model.
2: It has all kinds of colorful blinking lights on the front of its fuselage (pronounced "

; not "fyoo SELL' uh jee" as Drake Parker from the TV program "Drake and Josh" would pronounce it

) and a white LED facing rearward.
3: It has a gyro -- that means it's easy to fly even for a "craptastic" pilot like me.

This is a fairly large, lightweight (as a helicopter in a plastic body goes), easy-to-fly 3-channel remote-controlled outdoor (and indoors with a large enough space) helicoper. Its remote uses RF (radio frequency) radiation.

It has a coaxial design to minimise those "out-of-control" moments, and make flying possible even with a busted tail rotor (though if the tail rotor is completely gone, moving forward & backward will no longer be possible).
"Coaxial" in this case means that it has two sets of main rotor blades; one set of blades spins in the opposite direction as the other. Doing things this way virtually eliminates that wild, out-of-control spinning that plagues many other non-coaxial R/C helicopters and makes this one exceptionally easy to fly even for beginner pilots!!! It also has a gyroscope (very commonly abbreviated to just "gyro") in it that makes this heli exceptionally stable and lets slow-speed maneuvers and hovering be accomplished much more easily than it would be in R/C helis without a gyro.

Size of product w/hand to show scale

SIZE

This toy (some people might call it something other than a "toy") is remarkably easy to use for a helicopter...here's how to get it off the ground:

As with any rechargeable product, charge it first (see directly below), and then you can pretend to fly a dragonfly (well, that's what the kitty cat thought it was when I flew it in the house yesterday).

Secondly (and you only need to do this one time): Screw the furnished antenna into the receptacle for it on the front of the remote control ("front", as the joysticks face upward). Screw it in finger-tight only; please do not use tools of any type here. Then pull up on it to extend it.

1: Place the heli on the ground so that the tail faces you. On the underside of the Hughes Defender YD-911 Coaxial Helicopter's body (toward the rear of its fuselage not far from the tail boom), there's a fairly sizeable on/off switch.
Slide this switch to the "on" position.

Move several feet away from the helicopter (at least six feet away).

2: On the remote control, turn the "on/off" switch to the "on" position.

3:Gently push the left-hand stick on the remote control forward fairly gingerly so that the helicopter doesn't just blast away -- it has a good deal of thrust, so the possibility of it getting away in this manner does exist.

5: The Hughes Defender YD-911 Coaxial Helicopter should now lift off the ground. Congratulations, you're now a pilot!!!

Reading this web page (about another R/C helicopter) will give you a good idea of the process of flying it.
For additional instructions & tips on how to fly, please read the instructional material that comes with the product.

There is a toggle switch on the upper left face of the remote: it is to change modes from slow to faster respose -- as you become more experienced flying, you can change the flight mode to the faster one.

Turn the Hughes Defender YD-911 Coaxial Helicopter and remote control off when finished using them.
Same switches as before, but slide them in the opposite direction this time.

The battery in the Hughes Defender YD-911 Coaxial Helicopter itself is rechargeable and is not designed to be changed; however the batteries in the remote will need to be changed from time to time.

To do this, unscrew & remove the phillips screw from the battery door on the underside of the unit, using a small phillips screwdriver (the #0 from my set of jeweller's screwdrivers worked well here). Set the screw aside.

Remove the battery door, carry it to the top of the basement stairs, and kick it down those stairs into the basement crawling with thousands of hungry piss ants that have to piddle -- they'll think it's something yummy to eat and start chewing on it, but quickly find it unpalatable so that they drag it to the queen, who also finds it distasteful so she piddles on it and instructs the worker ants to do the same...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead.

Remove the eight used AA cells from the compartment, and dispose of or recycle them as you see fit.

Insert eight new AA cells into the compartment, orienting each cell so its flat-end (-) negative faces a spring for it in each chamber.

Finally, place the battery door back on, and screw the screw back in.
Aren't you glad you didn't kick that battery door down the stairs to all those hungry, hungry piss ants with full bladders now?

To charge the battery in the Hughes Defender YD-911 Coaxial Helicopter, take the thin cord that's attached to the "wall wart" charger, and plug that into the charger box.

On the underside of the heli's fuselage, you'll see a cord with three wires on it connected to a rectangular white plug. Plug this into the receptavcle for it on the front of the charger box.

Plug the "wall wart" into any standard (in north America anyway) 110 volts to 130 volts AC 60Hz two- or three-slot household receptacle (or "outlet" or even "wall socket" if you prefer).

When the charge cycle is in progress, the red LED on the charger box will come on; it will extinguish when the charge cycle is complete.
You may then safely unplug the helicopter from the charger, and unplug the "wall wart" from the AC receptacle.

Charging is advertised to take approx. 120 minutes when the battery in the helicopter is essentially fully discharged (flat).

Fully charging the Hughes Defender YD-911 Coaxial Helicopter's battery should give you ~9 minutes of flying time.

This RC helicopter is meant to be used as a toy in a dry area outdoors (or in a large open room indoors), not as a flashlight meant to be carried around all the time, thrashed, and abused; so I won't throw it against the wall, stomp on it, try to drown it in the {vulgar slang term for caca}bowl or the cistern, run over it, swing it against the concrete floor of a patio, bash it open to check it for candiosity, fire it from the cannoņata (I guess I've been watching the TV program "Viva Piņata" too much again

- candiosity is usually checked with a scanner-type device on a platform with a large readout, with a handheld wand that Langston Lickatoad uses, or with a pack-of-cards-sized device that Fergy Fudgehog uses; and the cannoņata is only used to shoot piņatas to piņata parties away from picturesque Piņata Island), send it to the Daystrom Institute for additional analysis, or inflict upon it punishments that I might inflict upon a flashlight.

So this section of the helicopter's web page will be significantly more bare than this section of the web page on a page about a flashlight.

Stated range of the radio in the Tx (RC hobby talk for "transmitter") is 50 meters (~150 feet); frequency is stated as 40MHz / 45MHz / 49MHz.

The unit has a 3-channel remote control; this allows for forward / backward / up / down / left / right movement (movement on all three axes -- X, Y, and Z). It also has a fully proportional control system; simply meaning that the motor speeds can be varied depending on how far you move the joysticks -- it isn't simply "full power and no power at all" like some other R/C products.

This heli is rather large and powerful; it could be termed a "cat slicer" or even a "cat killer" if it were flown indoors in a pet-owning household.

Photograph of its remote control.

Spectrographic analysis of one of the white LEDs (found on both the front and rear of its fuselage)* {body}.

Spectrographic analysis of the red die of one of the red/blue bicolor LEDs in (what looks like) its rocket launchers.

Spectrographic analysis of the blue die of one of the red/blue bicolor LEDs in (what looks like) its rocket launchers.

Spectrographic analysis of the red "Power" LED in the helicopter's remote control.

Spectrographic analysis of the red "Acceleration level high" LED in the helicopter's Tx (remote control).
The minor "hump" in the yellow is caused by yellow LEDs operating very nearby the red ones, and could not be quashed.

Spectrographic analysis of the green "Acceleration level low" LED in the helicopter's Tx (remote control).

Spectrographic analysis of the yellow "Acceleration level medium" LED in the helicopter's Tx (remote control).

Spectrographic analysis of the yellow-green "Power" LED in the helicopter's charger box.

Spectrographic analysis of the red "Charge cycle in progress" LED in the helicopter's charger box.

USB2000 Spectrometer graciously donated by P.L.

Maiden flight of the 3CH. R/C Hughes Defender YD-911 Coaxial Helicopter.

The tail rotor came off and became lost sometime during the brief flight*; it's a good thing that a spare was included because I needed it almost immediately. :-/

I already ordered two more spare ones from this website because I have a rather strong feeling that I'm gonna need them. :-O

Not much to see here, but the motor sound might tell you approx. how long it was in the air but off-camera.

That music you might hear (well, are *SUPPOSED TO* hear) is the song "The Voice of Energy" by...cummon..you've just ***GOT*** to know this one...take a whack at it anyway...

If you guessed "Hozay Feliciano" then ĄĄĄPARA LOS MOTIVOS NO DE CRISTO!!!
It's Kraftwerk you silly goose!!! ;-)

This video is approximately 2.40934633479 megabytes (2,601,689 bytes) in length; dial-up users please be aware.
It will take no less than twelve minutes to load at 48.0Kbps.

I cannot provide this video in other formats, so please do not ask.

ALL OF THE OTHER VIDEOS NOW HAVE THEIR OWN WEB PAGE BECAUSE THERE ARE JUST TOO MANY OF THEM AT THIS TIME!!!

TEST NOTES:
Test unit was purchased on Ebay on 06-12-11 (or "12 Jun 2011" or even "Jun 12, Twenty Double Sticks" if you prefer), and was received at 2:51pm PDT on 06-16-11 (or "16 Jun 2011" or even "Jun 16, Twenty Double Sticks").

* This word is definitely *NOT* pronounced "fyoo SELL' uh jee" as Drake Parker from the TV program "Drake and Josh" would pronounce it

; it is pronounced "

".

The AC charger is labelled to have an input of 100 volts to 240 volts 50 or 60Hz, an output of DC +10.00 volts, and is able to sink 800mA.

* The spare tail rotor came off rather quickly during static testing; had I flown this heli again without doing this first, the tail rotor would have fallen off and (since this is aleready the spare) I'd be S.O.L. I'm trying a bit of white household glue now; after 24 hours or so, I'll repeat my static tests and see what happens.

UPDATE: 06-29-11
The spare tail rotor blades I purchased online at www.detelex.com... a week or so ago arrived yesterday, so I can fly with more confidence knowing that if the heli throws another one that I'll have a couple of backups.

UPDATE: 05-23-12
I have effected a "repair" of the tail rotor ass'y by gluing the tail rotor itself onto the motor shaft with a strong but nonpermanent adhesive (***NOT*** cyanoacrylate or cyanoacrylate-based!). It performed well during static testing, so the next test will be a flight to take place on the socker fields at Celebration Park in Federal Way WA. USA the next fairweather day we get. And if the heli still throws the tail rotor despite its reinforcement (making it stay on the motor shaft more securely), I have two spare ones.

UPDATE: 07-14-12

This is the landing of this helicopter on my 07-11-12 flights.

Unknown

Medium-sized ("400-size") R/C helicopter

LED

17 (1 yellow in R/C, 1 bicolor in charger, 15 in helicopter itself)

N/A

Slide switch on/off on both R/C and helicopter

Plastic & metal

N/A

8x AA cells for R/C; 1,100mAh (1.1Ah) 7.4V Li:PO battery in helicopter

Unknown/unable to measure

Very light sprinkle-resistance only

FOR CHRIST SAKES NOOOOO!!!

Charger, AC adapter for charger, spare tail rotor, unknown spare part in same bag as the tail rotor

45.0cm L x 7.0cm W x 24.50cm H

Unknown/not equipped to weigh (advertised as 418 grams gross wt.)

China

Unknown/not stated

3CH. R/C Hughes Defender YD-911 Coaxial Helicopter *

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