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HeliProz . ZoomsHobbies . HeliHobby

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e-E-Sky Honey Bee- Lama- Belt CP- E-Smart > HBK2 Stings like a BEE
 
 
Tsuper
Heliman
Location: Canada West

Ouch! Ouch! Ouch! Ouch! Ouch!

I basically tried stopping the blades with my 2 hands.
I received some deep bruising and major soreness.

Why am I so stupid you may ask?

Long story short: I plugged in the battery and then noticed that my radio was not on. Then I frantically tried to get the deans connector unplugged.

So I have 2 questions for the forum.

1. How can I get them(deans) to come apart easier?

2. And why did my HBK2 rotor start to rotate?

I never thought to unplug the E-sky 3900 motor connectors as they come off easier and they would have stopped the motor from digging into my hands as I tried to get them out of the way.

I finally got to my radio and decided to turn it on as my heli was going crazy and self destructing in front of me. Nothing worked.
After the rotor stopped spinning I finally did disconnect the motor connectors and then the deans connectors.

Still assessing the damage but it is major.

I was smart and did buy a bare bones machine for parts but it looks like a couple servo's are stripped.

It was a huge lesson to learn and fortunatley I didn't get hurt too bad.

Tim
01-28-2008 05:46 PM
 
 
tryan02
rrProfessor
Location: Canton, Missouri

Wear boots and drop kick it out of the way.
the connectors are tight for a reason so they dont fall out in flight. I hope you learned a lesson that these are not toys. And if you ever get in this situation again let it go the blades will strike the ground and the main gear will strip and then you can more safely unplug it. Never willingly run into a limb chopper.

Canton MO backyard flying club
Club President
Team No funds left.
01-28-2008 06:08 PM
HOMEPAGE  
 
 
Gregor99
Elite Veteran
Location: Western Wa

All good points there Tryan. There are two things that I will add

1) If you follow the RADD training, he has you go through start up procedure, every time. Don't get lazy, do it every time. My startup procedure includes checking the radio (on, and throttle off, or throttle hold). Once the power up proceedure is done, I check the movement of the swash servos before applying throttle.

2) One of the advantages of higher end radios is that it will not power any of the servos or ESC unless its recieving a signal from the Tx. I have a Spektrum so I'll speak to its features, I suspect Futaba and JR have very similar features.

The Spektrum has two failsafe features. The first is that if the Rx looses the signal from the Tx it goes into pre-set fail safe mode. I have mine set for 0 pitch and 0 throttle. That makes it impossible get into trouble with your startup or shut down proceedure. The other failsafe is that every profile in the radio is coded to a specific Rx. That prevents the issue of forgetting that your Rx was set to one of your other helis, a plane or your SIM.
01-28-2008 06:40 PM
 
 
Jerry In Maine
Senior Heliman
Location: "Downeast" Maine

Back when I had my first Hummingbird heli I was at the table setting it up one evening. I had no experience with "e" power before - just nitro stuff. With Nitro engines you hear noise when they're dangerous...if they're quiet your safe. I learned that wsn't the case with an ESC.

Turned on the radio, ran the throttle up a bit - nothing. Checked everything and all seemed fine. WTF?

With the heli powered on I got into the radio programming and was checking/changing various settings and I guess I stumbled on Channel 3 reverse somehow. When I changed that settign I heard a "beep beep" as the ESC initiated and things then got real exciting real fast. Rotor started spinning - papers flew, I yelled and up went the heli from the table. It went from the dining room to the kitchen and hovered for a few seconds while it decided where to go and who to kill - then it turned right and went down the hall like a rocket. It glanced off each wall before coming to a halt near the front door.

I have a pet bird that sits on my shoulder when I'm messing around the house - she watched the whole episode and she's never been right since. The wife was on the couch and "hit the deck" when the heli went by and has never been real trusting of them since then.

I however have learned to be REAL careful. I wasn't hurt, but did see several years of my life go by and have much more respect now for these little flying blenders.

Be careful!
01-28-2008 06:49 PM
 
 
Tsuper
Heliman
Location: Canada West

The tightness of the Deans is not the issue, its getting my big mitts around the connector. There is no grip and the fingers just slip off.

Maybe these E-sky T connectors (aka deans) are not for me.

I would also think that the E-sky 25A ESC would have some kind of fail safe. It is just plain dangerous. IMHO.

I too have a nitro and there is an On/Off switch right on my raptor. Wouldn't it be easy to have a switch right on the ESC?

Tim
01-28-2008 08:44 PM
 
 
Gregor99
Elite Veteran
Location: Western Wa

Quote 
Wouldn't it be easy to have a switch right on the ESC?
Back on in the day, when I used to race RC cars, all of the ESCs had on off switches. Usually they were nice tiny little micro switches on a dongle so you could mount them anywhere its convenient. Plus you could also plug in the battery, and install the body, leaving the power off until you were ready. When I got into helis I was surprised that feature seemed to be lacking in all the speed controls.

But then again all the RC car speed controls were for brushed motors and cost well over $100. Brushless is more complicated and they are dirt cheap by comparison.

Fortunately features like those I described on the Spektrum make the power switch almost obsolete. If the Rx is recieving the Tx, it won't power up the servos and throttle stays off. There's still some current being used, but not alot. Regardless if there was an ESC with a remote power switch (and reasonably priced) I'd pay extra for it.
01-28-2008 09:15 PM
 
 
slider46
rrProfessor
Location: Gloversville, NY

Another good reaso to unplug the ESC from the rx while working on your heli.. I power my RX with an old nicad pack to do any setup of the radio or heli. Just plug it into the spot where your ESC plugs in and you have full power to everything you need but the motor and ESC. That way the only power is to the rx only, so no scary things can happen by accident.... Plus some ESC's will fry if powered up and not drawing current, I had an Align ESC burn up on the bench, makeing adjustments while it was plugged in.... Never again will I do that..

Tom..... No "D" flying....
01-28-2008 10:10 PM
 
 
shizack
Key Veteran
Location: Augusta, GA USA

The problem with a power switch is that in order to handle the current we're pushing (often 12 - 15 amps or more) It would need to be nearly as big as your thumb. Another 25 - 30 grams added to an already piggy heli would pull even more current; shorten flight time...

Pumping your fist and yelling, "COME ON!!!" does not increase battery charge rate.
01-28-2008 10:11 PM
HOMEPAGE  
 
 
Gregor99
Elite Veteran
Location: Western Wa

On my Novak speed control the swith is not in series with the battery. I don't know excactly how it works. Most likely its connected to a transister or mosfet that is in series with the battery.
01-28-2008 10:20 PM
 
 
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e-E-Sky Honey Bee- Lama- Belt CP- E-Smart > HBK2 Stings like a BEE
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