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250 Class Electric Helicopters 250 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 05-02-2018, 09:00 AM   #1 (permalink)
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Default FBL units and servo plugs.

Just in process of converting a flybar to FBL.
I see a few units have the smaller plug sockets BUT the align servos have standard plugs.
What do you guys do? get a FBL unit with big sockets OR replace the plugs on the servos?
Just ordered the DFC head/parts and HW 15amp esc.
Not ordered FBL unit until I know best way to go.

Any info would be great.
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Old 05-03-2018, 08:11 PM   #2 (permalink)
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From what I've read..

The fbl with standard servo plugs can provide more amperage to the more demanding 250 size servos. Fbl's with smaller plugs provide enough amperage for micro servos and are most in sub-250 size helis.

The Spektrum AR7200bx is popular because it's both a 6ch receiver AND fbl in one unit. Most (all?) other fbl units require a separate receiver (futaba/spektrum)
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Old 05-03-2018, 08:32 PM   #3 (permalink)
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The micro JST's can handle up to 5a - you'll never pull that on a micro servo.

I run a uBrain on mine. I crimped my own micro jst plugs on the servos and it was terrible - jewelers glasses and a bunch of messed up crimps. It works though.

MSH does sell a conversion set for JST to standard servo's - I just wanted to save weight.
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Old 05-04-2018, 09:23 AM   #4 (permalink)
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The Mini Brain 2 fits nice and flies great no need for plug conversions.

Looking back for me it was the micro brain 2 vs mini brain 2, the mini being only a few grams heavier, however the convenience of not having to swap my connectors or use adapters.
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Old 05-06-2018, 06:06 AM   #5 (permalink)
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Micro JST connectors and sockets are not nearly as robust as standard. I've seen them pulled apart with just a little too much force applied the wrong way. The only reason I would use a micro FBL is for a very small heli. Even then, you would only do it to save weight if you don't plan to use adapters, because the adapter cables will add as much weight in total as the difference between a 12g FBL and a 6g micro.

The other reason to use a micro would be if the cost savings makes a big difference to you. Otherwise, stick with a mini or standard size servo.

If you're converting a 450 or larger, which I assume, any FBL out there will fit fine.

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