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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 08-10-2018, 01:58 PM   #1 (permalink)
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Default Just bought a used 250 dfc any tips?

As the title

Just got a used trex 250 pro dfc that came with a Spektrum ar7200bx and a separate bec attached also

Any tips at all for spares that go regular in crashes or wear quickly ?

Also are the transmitter settings the same for the ar7200bx the same as the ar7210bx ?

Thanks in advance 🙃🙏🏼
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Old 08-10-2018, 03:28 PM   #2 (permalink)
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I still fly mine on a regular basis. In fact last week before IRCHA I got new NanoTech batteries and that really improved performance over my 3 year old batteries.

Make sure the bearings in the head are good and not crunchy. Bearings in the head that don't move smoothly cause a bad hysteresis effect with the collective. The mushroom gear has spun on its shaft on me also. Maybe caused by damage from a prior crash, however.

Anyway, on a used machine I'd probably totally disassemble it and check all the bearings and gears and torque tube assembly.
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Old 08-10-2018, 05:28 PM   #3 (permalink)
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Quote:
Originally Posted by ic-racer View Post
The mushroom gear has spun on its shaft on me also. Maybe caused by damage from a prior crash, however.
This has been happening for ever - it's a combination of heat and oil getting up under the gear. If you look through the threads from years ago, you'll find that even on the new ones we would pop the gear off and use some JB Weld to keep it on snug. Clean it with alcohol first and apply the epoxy inside the gear before pressing it on so it doesn't get in the bearing.
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Old 08-11-2018, 08:19 AM   #4 (permalink)
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Ah thanks for the heads up .. going to replace all the bearings as there’s wobbles all over the place .. shall get some goo for the pinion gear too 👍🏻
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Old 08-12-2018, 05:02 AM   #5 (permalink)
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I'd be tempted to look at some of that wire routing too. No need for cable braid on a 250, it's unnecessary weight. And ESC wires have an easy route along the side of the frame, no need to cross under the motor like that.
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Old 08-12-2018, 06:27 AM   #6 (permalink)
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I'd be tempted to look at some of that wire routing too. No need for cable braid on a 250, it's unnecessary weight. And ESC wires have an easy route along the side of the frame, no need to cross under the motor like that.

Yeah I thought it was a bit unnecessary as not even done it on my 470 lt lol

Shall take a before and after weight see how many grams we can shift .. I reckon a lot will be saved swapping out the align esc/ ccbec will save a fair amount 🙃
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Old 08-12-2018, 07:27 AM   #7 (permalink)
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Yup, likely 20g or more weight saving from that alone. I always solder my 250 motor straight to a Talon 15, makes it neat & tidy, the Talon 15 can stick underneath the battery tray, and it's the ideal combination.
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Old 08-12-2018, 05:57 PM   #8 (permalink)
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So ... Started stripping her down this eve weighed it without battery and we got 293.18g .. old esc/ bec combo came in at 30.09g compared to the 6.45 of the talon 15 .. may even get a talon 25 instead of the 15 we shall see ..

Also just stripping it down we’ve managed to chop out 5g just in cable ties and heat shrink and a couple of unnecessary sticky pads alone .

Is looking like a much more sprightly bird already 👌🏻🙃
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