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CostaRicaHeli

Heliman

Costa Rica, Central America

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Guys,

I recently read a post where there were arguments for and against having a FBL unit and an ESC within the same unit. I do agree with those that explained that the functions of those units (and the capabilities for manufacturing them) were very different, and especially the fact that ESCs come in many different shapes and sizes, making it impractical for many different setups.

However,this post got me thinking (I know, dangerous proposition!) that while the ESC is the "brain" controlling the motor and power source,shouldn't they come with a magnetic switch incorporated and switchable also from the transmitter. This would be redundancy safety on all ESCs, so that if either the magnet is on or if the switch on the TX is off, the ESC will never get power to arm. A nice touch would be that with another switch on the Tx we could give power only to the BEC in order to power FBL, Receiver and servos having complete confidence that with the magnet on and /or the other Tx switch off, there will be NO power to the motor.

I've been wanting to get this setup and I think I figured it out by reading a lot through posts here and on HF (have to buy components separately), but came to the conclusion, that this switch feature should become standard on all ESCs.

Thoughts? If it already exists in one unit, please let me know.

Franz

10-19-2016 07:25 PM
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ticedoff8

Key Veteran

Morgan Hill, CA. USA

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Do you have a specific FBL that integrates all of this?

I see this as a possible issue on any heli above the "micro size"

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10-19-2016 09:33 PM
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ssmith512

Key Veteran

Indianapolis, IN USA

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Jeti has wireless magnetic switches. For main power leads, they are big and expensive.

http://www.espritmodel.com/jeti-pow...r-switches.aspx

Steve

10-19-2016 10:06 PM
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CostaRicaHeli

Heliman

Costa Rica, Central America

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Those are the kind of switches (either for a 12s/BEC or a 2s RX setup) that should be incorporated into the ESC.

It would be VERY practical (and with additional safety) without having to buy components all over the place. That's my point.

Franz

10-19-2016 10:47 PM
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dkshema

rrMaster

Cedar Rapids, IA

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Fun, but expensive, and impractical.

For anything but micro helis, a fully integrated FBL unit and ESC locks you into only one mounting position for everything. One large unit would be difficult to mount on different airframes. A failure in any part of the unit renders the entire unit unusable, and the entire unit would have to be replaced at greater cost.

I also don't see the advantage to having one or two additional switches, controlled by the TX. Two more TX channels needed to fly; you now need a minimum of 8 channels to fly. It also adds more complexity as well as additional single point failure items to worry about.

You can already disable the power by unplugging the battery. To disable the motor for setup, unplug two motor wires to prevent the motor from accidentally spinning up.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

10-21-2016 01:25 PM
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TheMainShaft

Heliman

Southlake, TX - USA

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Startup Safety for Electric Helis

The much needed startup safety feature belongs in the FBL unit.
No expensive magnetic switches are required. The FBL manufactures need to take a page from the quad manufactures. A simple "unlock" stick movement sequence is all that is required. Something like, on power up, requiring the sticks to be placed in the corners and held for 3 seconds before any throttle signals are allowed to pass to the ESC. Simple to implement and safe.

10-27-2016 11:34 AM
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CostaRicaHeli

Heliman

Costa Rica, Central America

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Agree completely. Now that I'm getting into big electrics, it makes no sense that with a wrong flick of a Tx switch, that I could literally get killed by my heli!!! I know and apply the safeguards of disconnecting the motor from the ESC, separating the motor gearing, throttle hold, but with technology today I find this is just nuts.

Franz

10-27-2016 10:56 PM
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old nitroman

Senior Heliman

Naples florida

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On my big electric planks I use a flag switch, when in esc will not work, pull the flag arms esc.

E5s and E7se, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380,180cfx

10-28-2016 01:26 PM
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RM3

Elite Veteran

Killeen, Texas - USA

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"All in One" units put you in a bad position should something go wrong.

suppose you burn up just your ESC, or the MEMs sensor goes bad in just the FBL unit... it would suck to have to replace EVERYTHING....

The idea behind separating some components is based on possibility of failure of that unit and the cost to replace that unit.

This is why on larger helis 500 class and up, its better to have a separate ESC, FBL and RX should any one of those portions fail, your cost to replace is only the failed device... And just as already stated, individual components allow for higher number of combinations to fill individuals particular applications.

This all in one idea fits the plug and play crowd more than the true modeler IMHO.

showing a preference will only get you into trouble, 90% of everything is crap...

10-28-2016 03:20 PM
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