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T-REX 250 › Trex 250 Align 410 servos
01-20-2010 09:50 AM  8 years agoPost 1
ultra2

rrNovice

Missouri

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I picked up a set of 3 JR 285MG servos, and am considering swapping out the Align 410 servos in my 250. Does anybody know how these compare? The 250 doesn't stay perfectly in trim throughout the flight, ..usually a click or two of trim on my 10X. I fly 4131's, or 8231's in my 60 size X-cells, and love the precision, and would like this little heli to be the same. Any favorite servos for precision out here?

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01-20-2010 12:11 PM  8 years agoPost 2
helidevil

rrElite Veteran

Brunswick, ME

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i dont really notice any drifting with mine. i'd stick with them for the speed!

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01-20-2010 01:59 PM  8 years agoPost 3
Richardmid1

rrProfessor

Leeds, England

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Trex 250 and precision dont really go together, the slightest breeze can fool you into thinking it is out of trim. The 410's are as accurate as any servo ive had, the Trex 250 on the other hand, not so accurate!

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01-20-2010 10:44 PM  8 years agoPost 4
NQNA

rrElite Veteran

USA

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So far my 410's have been great

+1 for Richardmid1 the breeze will be more of an issue than the servos.. She's a fast squirrely little machine.. great fun to fly.. keep the HS up there 5000+

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01-21-2010 01:51 AM  8 years agoPost 5
ultra2

rrNovice

Missouri

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Interesting, I agree, it seems fast and agile, ..and as calm as I thought it was, there may have been a slight breeze. Are you using the outer most hole of the servo arms, ..not the round wheel, or the "plus", but the 5 hole per side arm? 5 grand, man that's zingin'! I don't think my newer Bantam helicheck tach goes that high! How do you tach that?!

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01-21-2010 02:01 AM  8 years agoPost 6
helidevil

rrElite Veteran

Brunswick, ME

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How do you tach that?!
you dont!!! lol you duck and head for cover!!!

but if you want that kind of HS try out the outrage NRG's. im going to a little indoor flying thing this weekend, ill get someone to reccord it. these batts will not disapoint!!!

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01-21-2010 03:16 AM  8 years agoPost 7
NQNArrElite Veteran - USA - My Posts: All  Forum  Topic

We tached it at 5200rpm 0 degree pitch on the bench begin held down by my son.. with a blast shield just in case. When your tach only goes to 3000 your tach can stop the blades at 1/2 speed and then multiply by 2 ...so 5200rpm = 2600 on the tach. Just make sure you see only 2 blades not 4 blades when you look through the sight.

Btw my motor is the Scorpion HKII-2206-3900KV on 3S Hyperion 850 and TP 910's and 14t pinion.

Ultra.. those head speeds are also with all metal tail rotor and main rotor parts.. I wouldn't even think of those speeds with any plastic..

As far as how the stock 250 flys.. I've only flown the SE so maybe somebody else can speak to that..

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01-21-2010 09:42 AM  8 years agoPost 8
ultra2

rrNovice

Missouri

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half speed division
you're right, I have heard that before, just not refered to main rotor head speed calculation! Amazing how fast these things are spinning more and more!

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01-22-2010 09:54 PM  8 years agoPost 9
coolice

rrKey Veteran

Northamptonshire, England

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Hey.

Tight balls :-) the latter can make the little 250 difficult to trim and feel that it cannot be locked into a stable hover.

I've been really happy with my 250 and the stock Align eCCPM servos, but if you don't size the ball links it can feel horrible.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

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01-23-2010 04:03 AM  8 years agoPost 10
NQNA

rrElite Veteran

USA

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yes you will need to size the balls or they are way too tight. Also if the hs is too slow it will wander around and feel like it's difficult to hover in one spot. I like landing in Idle-up and the higher hs.. it just feels and responds more accurate.

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01-23-2010 02:11 PM  8 years agoPost 11
ultra2

rrNovice

Missouri

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head speed
as I read through this, I become more and more curious where the H.speed is. I've got a straight throttle curve, just like the pitch. I grab the motor and esc after each flight to ensure I'm not overloading them and they're always just warm to the touch. As for ball sizing, I have yet to acquire, or fab my own, instead, I've gently pinched mine with a needle nose plier to where I they can be twisted in place like a toothpick between my finger and thumb without being sloppy. I've found factory slop in the links off the swash 90 degrees from the pitch links, ....there, and the linkage connected to the flybar. The "hinged" links off the swash could maybe be improved by resizing, and repinning, ...haven't tried, but think that would eliminate that slop. It is a blast to fly!

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