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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 10-22-2017, 09:14 PM   #1 (permalink)
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Default Trex 250 servos

I have a trex 250 (base, not se but all aluminum rotor head) that I picked up that was a complete airframe plus the electronic components not installed. The servos that were included were ds415m?s that were too big to fit in the airframe. They were too wide and I didn?t want to get of the files to make them fit. What is a good replacement for the ds410?s that are meant for the heli. Looking at the specs the ds410 has a lot of torque but is that overkill for a 250 because those servos were also used in the 450? Trying to stay in the budget I?m looking at corona ds-919-mg?s but they stall at 1.7kg and a 410 stalls at 2.5.
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Old 10-23-2017, 01:55 PM   #2 (permalink)
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1.7Kg is fine, just make sure you run them @ 6.0V.

Those coronas are not full metal gear, they have one plastic gear which tends to break in a crash. So try not to crash.
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Old 10-24-2017, 10:27 AM   #3 (permalink)
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Not sure why you can't fit the ds415m, I have those in mine, fit in the old SE frames and the new pro frames.

They are meh ... servos, they work great for me however have a ton of play after a few flights.
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Old 10-24-2017, 07:31 PM   #4 (permalink)
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Not sure why you can't fit the ds415m, I have those in mine, fit in the old SE frames and the new pro frames.

They are meh ... servos, they work great for me however have a ton of play after a few flights.
My frame is pre SE. they are too tall to fit the offset cuts and I didnt want to file.

I ended up getting an offer accepted on 3 turnigy tss-10mg servos on eBay so I?ll be giving them a try. They are pretty close to the specs of the ds410 but no ball bearing. If they are sloppy they?ll get pulled out for something else.

On a second note, how much drag should there be on the radial bearing in the swash plate from cyclic input? This one seems kind of ?tight? so if the swash won?t self center once it?s been set up I may have to replace it.
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Old 10-24-2017, 08:21 PM   #5 (permalink)
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IMO the Spektrum 3050/3060 can't be beat for the cyclic and tail. They're pretty much the lightest metal gear servos with decent specs. Weight is everything on the 250.
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Old 10-25-2017, 12:58 PM   #6 (permalink)
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Emax 08's are a fine budget option if you want something that is pretty light, durable and a great value. $18 for a set of 3.
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Old 10-25-2017, 02:51 PM   #7 (permalink)
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Originally Posted by Tug Driver View Post
On a second note, how much drag should there be on the radial bearing in the swash plate from cyclic input? This one seems kind of ?tight? so if the swash won?t self center once it?s been set up I may have to replace it.
Mine is pretty loose, prolly from the 100s of flights I have though, maybe some triflow and a couple of hovering flights to see if it loosens up?

As for centering, I gave up on precision on this heli, the DS410s are horrible for centering and usually fly in some wind so my heli bobs all the time anyway, I pretty much used her as a means for muscle memory on always being on the sticks keeping her where I want her.

Now I am thinking about getting a good set of cyclics ... my first CP does deserve some new love.
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Old 10-26-2017, 07:14 AM   #8 (permalink)
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Emax 08's are a fine budget option if you want something that is pretty light, durable and a great value. $18 for a set of 3.
Those emax servos look like a generic china version of the servos I got. The turnigy tss-10mg. They don?t have a bearing either it looks like the output just rides in the top cover. The turnigy is digital though.
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Old 10-26-2017, 10:19 AM   #9 (permalink)
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Those emax servos look like a generic china version of the servos I got. The turnigy tss-10mg. They don?t have a bearing either it looks like the output just rides in the top cover. The turnigy is digital though.
Generic version of Turnigy? I didn't think it was possible to get more generic than Turnigy. In case you don't know, Turnigy is the house brand of Hobby King.

https://www.banggood.com/Wholesale-E...1893200201507N

They are digitial and have a pretty good reputation on RCG for use as 450D03 replacements.
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Old 10-26-2017, 10:43 AM   #10 (permalink)
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AFAIK, the Turningy servos are all re-brands. Some are KST and some are made by a company called Henge (Wuxi Henge Electronic Co., Ltd.). I haven't used them myself, but I've read people like them.

I bought a Trex 250 Pro DFC kit some time ago and it came with Align branded servos, DS416M and DS424M. Didn't like those servos much at all. They were heavy and one burned out. They didn't center well and had a lot of slop. Align servos are made by Savox and I've since avoided that brand of servo because of that.

I have an Oxy 2 now and have retired the Trex 250. That one has Lynx servos. They're pretty good actually, happy with them, but they're relatively expensive, though the all plastic ones are a lot cheaper. Those are actually made by a company called Blue Arrow and they seem to make pretty good servos, not widely available though, World leading MIBLservo tech innovation
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Old 10-26-2017, 12:16 PM   #11 (permalink)
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Quote:
Originally Posted by yakky View Post
Quote:
Originally Posted by Tug Driver View Post
Those emax servos look like a generic china version of the servos I got. The turnigy tss-10mg. They don?t have a bearing either it looks like the output just rides in the top cover. The turnigy is digital though.
Generic version of Turnigy? I didn't think it was possible to get more generic than Turnigy. In case you don't know, Turnigy is the house brand of Hobby King.

https://www.banggood.com/Wholesale-E...1893200201507N

They are digitial and have a pretty good reputation on RCG for use as 450D03 replacements.
I mean they are generic regardless of who sells them. It?s a generic out of China servo.
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Old 10-26-2017, 01:13 PM   #12 (permalink)
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I mean they are generic regardless of who sells them. It?s a generic out of China servo.
I've purchased just about every micro sized servo out there in the <$20 range, can't say anything I own is exactly like the Emax, so no, I don't think they are generic micro servos. In fact if you find another source of servo horns let me know, the only ones that fit are Emax.
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Old 10-26-2017, 01:54 PM   #13 (permalink)
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I don't know about Emax servos, but their multi rotor motors are top notch ... like they had some game changing motors come out that forced everyone else to up their game.
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Old 10-28-2017, 08:49 AM   #14 (permalink)
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I got the turnigy servos. The drive spline is so high above the mounting tabs that the angle of the pushrods to the swash plate were so extreme I had to take off a frame plate and mount the servo tabs inside the frame but the geometry of the linkage is correct.
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Old 12-03-2017, 08:15 PM   #15 (permalink)
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Quote:
Originally Posted by yakky View Post
Emax 08's are a fine budget option if you want something that is pretty light, durable and a great value. $18 for a set of 3.
Exact part number? I might want to try it.
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Old 12-04-2017, 07:34 AM   #16 (permalink)
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Exact part number? I might want to try it.
https://www.banggood.com/Wholesale-E...1893200201507N

I've since purchased a couple of sets, they are nice for the $. No one is going to confuse them for $20 servos, but they'll get the job done and are way nicer than the Eflite D76 stuff.
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Old 12-04-2017, 09:08 AM   #17 (permalink)
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Quote:
Originally Posted by yakky View Post
https://www.banggood.com/Wholesale-E...1893200201507N

I've since purchased a couple of sets, they are nice for the $. No one is going to confuse them for $20 servos, but they'll get the job done and are way nicer than the Eflite D76 stuff.
Thank you.
straight replacement? rotating same direction as Align servo's?
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Old 12-04-2017, 09:28 AM   #18 (permalink)
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Thank you.
straight replacement? rotating same direction as Align servo's?
Size wize, they should be a direct fit but I'm not sure on the FBL setup, it would be foolish to not go through the setup again. And FWIW, order 4 in case you get a bad one or need a spare.
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Old 12-04-2017, 09:52 AM   #19 (permalink)
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Setting up is easy not that difficult on 3gx mrs fbl. But concern is servo’s need to be rotating same direction as Align servo’s. Or I have to disassembled servo, and reversed the few wires by re-soldering it, which I am not comfortable doing it.
I might pay extra, and get the all 3 Align DS416m servo’s on ebay …..
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Old 12-04-2017, 09:56 AM   #20 (permalink)
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Quote:
Originally Posted by 2005h4 View Post
Setting up is easy not that difficult on 3gx mrs fbl. But concern is servo’s need to be rotating same direction as Align servo’s. Or I have to disassembled servo, and reversed the few wires by re-soldering it, which I am not comfortable doing it.
I might pay extra, and get the all 3 Align DS416m servo’s on ebay …..
Ah, understood.
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