RunRyder RC
WATCH
 1 page 1861 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 250 › Miny servo for the 520 gyro on T250?
10-22-2009 01:33 PM  8 years agoPost 1
MAXHSHV

rrKey Veteran

,mn usa

My Posts: All  Forum  Topic

what servo works good with the 520 on a trex 250 or any other small heli?
I tryed a 9254 on it in my t700 and wasn't happy because i could never get it to settle in, allways a slight wagg, then some buddies told me they were runninf the bls251 with no issues and so i switched an lo and behold it's the best gyro i've flown, one thing i know is that the bl251 is of the 760 super narrow pulse width type witch i only know of three made and none are mini's, so does anybody know of a mini with 760 pulse width?

Century heli rep. To much power is never enough.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2009 02:19 PM  8 years agoPost 2
robl45

rrKey Veteran

Deerfield Beach, FL

My Posts: All  Forum  Topic

you can try the futaba bls257. don't know if its narrow pulse.

also, the mks mini servo 8910 I think it is. that one is 760 but not brushless.

PM  EMAIL  Attn:RR  Quote
10-22-2009 02:25 PM  8 years agoPost 3
Darren Lee

rrElite Veteran

Woodstock, GA

My Posts: All  Forum  Topic

9257 works awesome with the 520. You don't need a 760us servo.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2009 03:35 PM  8 years agoPost 4
robl45

rrKey Veteran

Deerfield Beach, FL

My Posts: All  Forum  Topic

why spend 60 dollars for a 9257 when you can get a way faster 760 pulse servo

PM  EMAIL  Attn:RR  Quote
10-22-2009 04:35 PM  8 years agoPost 5
nappyroots2182

rrElite Veteran

Moline, il

My Posts: All  Forum  Topic

i have a jr 290 srevo on my tail. works great and small and light

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2009 08:04 PM  8 years agoPost 6
helidevil

rrElite Veteran

Brunswick, ME

My Posts: All  Forum  Topic

the align DS420 hasn't failed me yet!

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2009 08:43 PM  8 years agoPost 7
pseudonym

rrApprentice

Edmonton, Alberta

My Posts: All  Forum  Topic

JR DS290G for the WIN!

You aren't going to get faster than .06! It is also a sub-micro so it is even smaller and lighter than a normal micro. The ONLY issue I have found is that you have to drill your own hole for the ball, but as you should be about 4.8mm out from the centre of the servo, you will need to do that anyhow.

There is still some wag, but I am putting that down to the unacceptable slop in the stock tail blade holders and pitch slider in the stock tail. I am getting the microheli tail next week, I will let everyone know if that fixes the issue or not.

~m

unspelling the world one misprint at a time.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-22-2009 08:56 PM  8 years agoPost 8
coolice

rrKey Veteran

Northamptonshire, England

My Posts: All  Forum  Topic

Hey,

A lot of servo choice will come down to the type of flying you're currently doing with the model.

On my own model originally I replaced the stock Align DS420 with a JR 380G (UK's equivelant of the 290G) which worked well up to a certain point, but as I fly 3D I was finding the limit of this servo's holding power quite quickly.
I've now fitted an Align DS520, which is very similar if not the same performance as the Futaba 9257 but without the high price tag and have been very happy with it so far. It hold great and while does look a little big on the little 250 does not seem to effect the C/G too much that I can notice it in flight.

As usual you need to stick to an arm length of 5mm out from centre and have the normal gyro settings for this model.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-22-2009 09:16 PM  8 years agoPost 9
pseudonym

rrApprentice

Edmonton, Alberta

My Posts: All  Forum  Topic

What kind of issues were you finding? Right now my issue is that the motor seems to be rather under torqued so I get bogging when I try and flip it too fast. Lovely to watch the heli loose tail speed and start to skitter around. Definatly a sphincter puckerer for me!

unspelling the world one misprint at a time.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-22-2009 09:53 PM  8 years agoPost 10
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

http://www.fast-lad.co.uk/store/log...rvo-p-3765.html

I use one of these: http://www.fast-lad.co.uk/store/hyp...gcb-p-7187.html check out the speed! I believe this is the same servo as the Robbe FS 61 BB which is also a good servo for the 250.

pseudonym, try the new SP motor that comes with the new SE on 16T and get an Align 850mah 30C pack! Best pack for this heli, unbelievable power!

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-22-2009 10:07 PM  8 years agoPost 11
pseudonym

rrApprentice

Edmonton, Alberta

My Posts: All  Forum  Topic

That is quite the nice little servo! Good price too! I wonder if there is someplace in N.A. that they are avalible?

Not to sure how they compaire in the torque area, I really really really wish that Imperial would just die already. Anyone know the conversion off the top of their heads?

unspelling the world one misprint at a time.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-22-2009 11:16 PM  8 years agoPost 12
krashtagain

rrKey Veteran

ohio

My Posts: All  Forum  Topic

JR 290 and be done . The majority can't be wrong . A 9257 works well also but I wouldn't run out and buy on if you can get your hands on a 290 .

If you're not living on the edge you're just taking up space !

PM  EMAIL  GALLERY  Attn:RR  Quote
10-22-2009 11:55 PM  8 years agoPost 13
coolice

rrKey Veteran

Northamptonshire, England

My Posts: All  Forum  Topic

What kind of issues were you finding? Right now my issue is that the motor seems to be rather under torqued so I get bogging when I try and flip it too fast. Lovely to watch the heli loose tail speed and start to skitter around. Definatly a sphincter puckerer for me!
Hey,

I have read and found myself that if you run too much collective pitch range on the little 250 you can do more harm than good.
While a large pitch range is ideal on larger models it is found that too much on the 250 can cause tail holding problems, largely linked to the torque reaction on the fuselage which is then made worse as the tail rotor slows down slightly and the 1kg torque tail servo cannot hold the tail command.

I take it you have one of the newer tail assemblys with the larger ball bearing which runs smoother under load? You even possibly have the weighted tail grip assembly Align offer for the small 250 which is aimed at helping relieve the forces transmitted back to the servo from the tail rotor.
The bottom line is that the smaller servo's just dont have a lot of torque to push the tail slider and keep it where it needs to be, add in a little too much pitch and you make the situation worse.

Here is a video of my 250 flying indoors with the previously fitted JR DS380G;

Watch at YouTube

As you can see it works quite well inside, but I felt that in any outside flights the combination of a slight breeze meant the tail rotor had to work harder to maintain a given position.

The Logictech LTS 3100G is very similar (if not the same) as Robbe's FS61BB ; http://www.fast-lad.co.uk/store/rob...rvo-p-1806.html which is slightly cheaper still and many are using this servo on the little 250 with good results.

However at these prices you cant ignore the Align DS520; http://www.fast-lad.co.uk/store/k10...rvo-p-4133.html which although marginally slower, bigger and heavier has more torque for commanding those tail blades. Throw in a set of the Align 40mm carbon tails and the weighted tail grips (which is what is on my machine now) and your tail will be locked in all angles.
I've also fitted the upgrade tail slider control arm to help reduce the force needed from the servo to move the tail rotor, as it's quite a powerful little tail.

As ever though the smaller the model the more critical and troublesome obtaining a nice tail setup becomes, the old Century 3D PRO was a real nightmare from memory.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-23-2009 06:17 AM  8 years agoPost 14
MAXHSHV

rrKey Veteran

,mn usa

My Posts: All  Forum  Topic

thanks all for your input.
hey robl45 what brand of servo is mks 8910?
I know the 1520 pulseband servo's will work but my exsperiance is that the 720 works about ten times as well, whats the poinr of have a top end gyro if you don't put a good servo behind it?
anybody know anything about the jr 3500 i think it is.a buddy is running one on the stk gyro and i flew his and was impressed, but don't know the pulse width on it.
also some of you talk of the 9257 witch i have a couple of one on my t500 and the other on g550 and they work great with the 401 but hav'nt tryed them on the 520, is the tail locked in , or does the tail always have a little wag from time to time.whitch was my exsperiance when runnijng the 9254 on my t700. then a couple of buddies got 520's and put the bls251's on them and right from the get go awesome performance, so i switched and whala perfection,what i was told was the 520 just can't perform to it's fullest with a 1520 servo that it needs the 760 otherwise it will never be happy, just when you think you have the gain right , it starts wagging again,and so on and so on, once i put a 760 servo on it the gyro gain was the most forgiving i've seen i went from gain numbers from around 25 in a futaba (62 in a jr) to 45 to 50 or (arounf d95 ) in a jr radio and the tail never even hints at a wagg and man does it keep up witht the collective, I also noticed it to be alot less sensitve to highspeed flight, with my 401 /9254 saetups you have to turn the gain down for fast flight, but not so with the 520 /bl251 combo.

Century heli rep. To much power is never enough.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-23-2009 10:41 AM  8 years agoPost 15
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

The micro servos maybe lacking in torque but with an arm length of no more than 5mm they will power the tail fine. I have ground off the weighted tail grips on my SE and the tail holds a little better! Certainly no worse anyway! I can do fast backwards hurricanes, funnels, high tail slides no problem, mind you I could with the DS420 and the stock 40mm blades. So basically ive wasted my money on a faster servo and carbon tail blades!

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-23-2009 10:45 AM  8 years agoPost 16
pseudonym

rrApprentice

Edmonton, Alberta

My Posts: All  Forum  Topic

Well.. the bogging issue got me today. Went up, inverted and started to do a tic-tock, she bogged and I lost tail control and she hit the dirt like it was trying to plant a tree. Broke the feathering shaft, boom is done, battery tray broke, bent a canopy mount and broke a boom strut and one of the upper links on the head. Not bad, I had extras of all the parts except for the link, so she is back together 99.9% now =). What is quite amazing is that after 2 fairly major crashes and one minor one, I STILL haven't had to get a new set of blades! Some little chips out of the tips, but a bit of sand paper took care of those! I love carbon fibre! It is an old friend. We have been using it in sailboats since the 80s and it is one of my favorite materials to work with.

Anyhow, I don't think the issue was a loss of torque from the servo. It definatly was loss of headspeed. I was useing a cheep e-flight 800mah 20C battery which just doesn't give me the pop that I got from my outrage 860mah. Still, I don't think it should have bogged that easily or that baddly. I think I am going to get my hobby store to order in a 16T pinion for me.

As for the tail servo.. do you think that a Futaba s3153 would be better? It is quite a bit slower (.10 compaired to .06), but it has alot more torque. I would get a 760.. if I could find a micro version! I really don't want to add any more weight to my heli if I can at all help it.

unspelling the world one misprint at a time.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-23-2009 01:47 PM  8 years agoPost 17
robl45

rrKey Veteran

Deerfield Beach, FL

My Posts: All  Forum  Topic

i've dealt with these issues on my gaui 200, and the bottom line I've found is the specs aren't that important, the little micro servos just don't seem to be up to the task. the mini servos seem to be the ticket for these little helis. 9257 seems to work well but if I had to do it, I would go with an MKS mini servo as its super fast and 760 pulse.

the make of MKS servos is MKS, you can get them from mars480.com in the states or hobbycity.

PM  EMAIL  Attn:RR  Quote
11-15-2009 03:21 PM  8 years agoPost 18
MAXHSHV

rrKey Veteran

,mn usa

My Posts: All  Forum  Topic

we ended up putting an alighn gyro and servo on my buddies t250, I convinced him to save the 520 for some thing that costs more then the gyro and that we can put the bls 251 in.I did read in the manual though that there recomodation for mini heli's is the 9257.
His 520 found it's way into his new NX 50 with a bls 251.

Century heli rep. To much power is never enough.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1861 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 250 › Miny servo for the 520 gyro on T250?
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Sunday, August 19 - 2:51 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online