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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 10-28-2013, 04:38 PM   #21 (permalink)
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Originally Posted by bmc76 View Post
I'm running them all at 5v. The tail servo is only rated at 5v, cyclics up to 6v. When I get the talon 15 I will either run a stepdown diode to the tail or use a different servo sub 9 grams. I'm researching servos now, not sure which direction I'll go yet as I don't like experimenting with servos at 20 to 40 bucks a pop.
I've got a couple dozen flights running the DS76t at 5.5v with the Talon. Should I be worried? It seems to work fine. What's .5 more volts, right?
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Old 10-28-2013, 05:26 PM   #22 (permalink)
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I've got a couple dozen flights running the DS76t at 5.5v with the Talon. Should I be worried? It seems to work fine. What's .5 more volts, right?
Not sure, just speaking off specs, not personal experience. I've never tried to run it over 5v.
People on the 450x forum frequently switch the esc to 6v and run a diode which would put the voltage to the tail around 5.3. Might dig around that forum and see if others have run the voltage higher with any luck.
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Old 10-28-2013, 05:27 PM   #23 (permalink)
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Not running a step down would be one less thing to add weight!!
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Old 10-28-2013, 05:27 PM   #24 (permalink)
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Do the align horns work with the ds76 servos?

I found a deal on some but they come with out horns.
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Old 10-28-2013, 05:35 PM   #25 (permalink)
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no, and the 300x horns don't work with the 250 balls, so you need 3 packs of s60 horns. I used 10.5/11mm from center with the longer balls on the front of the lower swash
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Old 10-28-2013, 07:15 PM   #26 (permalink)
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Damn I didn't pickup the servo horns. The ones that come with the servos wont work?



Are these the ones to get?



http://www.ebay.com/itm/131016299779





Sent from my Lumia 920 using Tapatalk
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Old 10-28-2013, 07:20 PM   #27 (permalink)
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[QUOTE=mdecker79;5398394]Damn I didn't pickup the servo horns. The ones that come with the servos wont work?



Are these the ones to get?



http://www.ebay.com/itm/131016299779





Sent from my Lumia 920 using Tapatalk[/QUOT

the ones that come with the servos should work, I took mine off the 300 sorry, didn't take that into account. you just need a hole 10 to 12.5 mm, 12.5 is stock, but I use 11, or right there around. if buying horns get the pack ending in100 eflsr100 or something like that
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Old 10-29-2013, 01:32 AM   #28 (permalink)
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Thank you for the info.

The servo horns that come with the DS76's work fine and so far with just very small circuits in the living room (running only a 65 flat curve to keep the head speed down) I can tell it fly's a lil lighter.

My 250 went from 360 to 341 so thats a nice lil diet!
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Old 10-29-2013, 12:39 PM   #29 (permalink)
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Thanks for your info, bmc76.
I am seriously considering ditching Align cyclic servos in my 250 build.

The step-down diode to lower the voltage must be 1N4001.
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Old 10-29-2013, 07:53 PM   #30 (permalink)
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I just pulled the trigger on that 76t servo,all I can say is damn the speed is listed at .03,thats faster than the mks clone servo I had on there before I don't like the torque specs,but I guess that shouldn't be an issue!! Good looking out on the weight loss program!I'm using a ZYXs with satellite already!Jenny Craig better take notes!
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Old 10-29-2013, 10:34 PM   #31 (permalink)
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I think I can get real close to 300 grams flat after installing zyx-s2 (software issues right now), talon 15(mid november release) , carbon boom, either pf or x-canopy, and trimming excess wires.

But at 320 grams I'm 100% satisfied. I think even if a servo failure causes a crash it will still be worth it is I just was not enjoying flying this thing until now, and this thing doesn't cost much to repair normally. I've never had one fail on my 300 or 450 so knock on wood.... I think my 2 crashes were less than $40 combined, I've spent that on a single 130x crash more than once.

I still want to find some high quality servos in the 8 to 9 gram range. Someone in post 2 mentioned those hyperions, I'm going to look for some feedback on those.
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Old 10-30-2013, 02:45 AM   #32 (permalink)
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I just shelled off money to get three ds76 first..

As a new guy in RC heli, I will definitely crash a lot, and ds76 gives one more advantage to me compared to ds415M: cheap to replace striped servo gears.

BTW, how unreliable is the DS76 in reality?
Is the ds76 mid-flight failure limited to elevator servo due to some mechanical binding issue? Or, is it really happening in all cyclic servos probably coming from poor QC?
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Old 10-30-2013, 04:35 PM   #33 (permalink)
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I'm waiting on that Talon 15 also!
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Old 10-30-2013, 04:50 PM   #34 (permalink)
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I just shelled off money to get three ds76 first..

As a new guy in RC heli, I will definitely crash a lot, and ds76 gives one more advantage to me compared to ds415M: cheap to replace striped servo gears.

BTW, how unreliable is the DS76 in reality?
Is the ds76 mid-flight failure limited to elevator servo due to some mechanical binding issue? Or, is it really happening in all cyclic servos probably coming from poor QC?
I've not had one fail on either the 450x or 300x, but you do read about it every once in a while, not like it's a constant subjuct on those forums, but I expect that at some point running them I will have a failure. The biggest gripe you read about is the plastic servo gears strip easily in a crash, but imo that is one of the tradeoffs to get the 7.6 grams.

I'm good with these until I find a better one very very close in weight. with the other things I have planned I may be able to afford another gram or so each on the servos, but whatever I do I'm not ever going over the 320 gram mark.
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Old 10-30-2013, 05:01 PM   #35 (permalink)
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You guys should cross post to the 300X/450X forums where those guys are all convinced that the Align 415/425 servos are the answer to their dreams!

A match made in heaven
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Old 10-30-2013, 06:19 PM   #36 (permalink)
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Default Lightweight 250 pro dfc

You guys sure are about your diets over here haha.

I have a talon question since you seem to know enough.

Talon 25 vs talon 15 ?

I have the yellow align esc and I want to switch it for something more reliable. The talon 25 came to mind but now I see there's a 15? Why would someone use the 25 over the 15 if the 15 is enough?
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Old 10-30-2013, 06:52 PM   #37 (permalink)
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Good thread, thanks for sharing what you've found bmc76.

Having recently put together a 250 DFC, and found that with stock electronics my fully loaded weight is 346 grams. It does feel heavier in the air than I'd like.

I too have a 450x with the stock ds76 /ds76t servos currently installed, but have read too many reports about the ds76 gears stripping in flight etc. It's made me paranoid to fly the 450x in case of failure, but putting the ds76's into the 250 should give the servo's an easier life than the 450x will give them, so I think this is the way I'll go too, and find some nice metal geared servo's for the 450X, though I doubt I'll use the Align 415 & 425 servos as they have far too much slop in them even when new.

I've done the "diode mod" on the ds76t so I could run the ESC's BEC at 6v, but I think I'll leave it in place when I move the servo's over and see how it goes before I take the diode back out again. It hardly adds any weight at all, so not something I'd be concerned about.

Having only the stock Yellow ESC at present, I have to admit that I'm tempted to hold out for the Talon 15 when it comes out to further reduce weight. As bmc76 has previously stated (in another thread I think) the stock ESC is only rated for 15A peak and seems to work fine, so the Talon 15 should fit the bill nicely.
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Old 10-30-2013, 08:54 PM   #38 (permalink)
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Talon 25 vs talon 15 ?

I have the yellow align esc and I want to switch it for something more reliable. The talon 25 came to mind but now I see there's a 15? Why would someone use the 25 over the 15 if the 15 is enough?
The 15 is not available yet. I can't think of another reason, but that's a good one.
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Old 10-30-2013, 09:12 PM   #39 (permalink)
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Default Lightweight 250 pro dfc

I just saw that. Do they have an eta?
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Old 10-30-2013, 09:49 PM   #40 (permalink)
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I just saw that. Do they have an eta?
mid november according to tower, so not long from now. Bad thing for me is I pulled the blue align out of the mail box then 30 minutes later saw the talon 15 on cc site .
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