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Old Mar 18, 2007, 07:59 PM
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Futaba GY240 VS GY401

I have a GY240 and have a 401 on the way. I an using a HS-81 at the moment on the tail. Am I likely to notice a difference with the 401 using an analogue servo or do I need to go to a digital servo for it to really shine over the 240?
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Old Mar 18, 2007, 08:25 PM
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USA, IL, Champaign
Joined Dec 2006
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Try a POLO 4 Digital. Same size and about $50

http://www2.towerhobbies.com/cgi-bin...?&I=LXGZU9&P=7

This is the MultiPlex Mini Polo Digital Size Servo.

FEATURES: Heavy duty metal gears Universal connector Can be used in aircraft where a Mini size servo is needed 3-Pole Motor Dual Ball Bearing

INCLUDES: One MultiPlex Mini Polo Digital Servo with 1 each round, star shaped, and two straight arms, four mounting screws, four rubber grommets, and four eyelets

REQUIRES: Installing in model

SPECS: Length: 1.1" (28mm) 4.8V 6.0V Width: 0.5" (13mm) Torque: 39 oz-in 49 oz-in Height: 1.3" (33mm) Speed: 0.10 sec 0.08 sec Weight: 0.77oz (22g) Motor: 3 pole ferrite
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Old Mar 18, 2007, 08:40 PM
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You will notice the difference between the 2 using the same servo and you wil get the most out of it using a fast tail servo.
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Old Mar 18, 2007, 08:41 PM
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hes asking about gyro differences.
no, from what i read, you should feel it right away. the 240 is said to have a slower piro rate, and the holding isnt as good. plus, gain needs to be changed on the gyro itself, not that it REALLY matters, but its more precise on the radio/401 because you can use 1% by 1% rather than a pot. plus, the 401 has a DS mode which optimizes for futaba digi servos.
thats all i can think of, somebody else could probably help.

if youre going to spend that much on that digi servo, youre better off going for an extra $10 on a Futaba 9650.
for 35 bucks though, the S3154 is a steal. DO NOT DO NOT DO NOT run DS mode on a 401 and an S3154 on 6V. and keep the tail shaft SLICK, im talking lube every 5-10 flights. i burned up my S3154 not doing these. Futaba replaced it for free, and i thankfully get another chance. im sure its a great servo (FAST!), but i apparently never gave it a chance.
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Old Mar 18, 2007, 09:07 PM
drops screws
Iowa City, IA
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I like the 401 over the 240 for two reasons..

I really like having a limit. It really is annoying when working on your heli and having your tail servo constantly binding.

I love messing with my gain from the TX instead of the stupid pot on the gyro.
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Old Mar 19, 2007, 08:52 AM
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In my experience, both the 240 and the 401 hold the tail VERY well.
As Billy Z said, the limit is really nice to set the servo movement limits.
And I do know that the 401 pirouettes considerably faster.

I think that with your existing servo, you will see all of the benefits, unless you are into 3D, and then the Futaba 9650 servo will be what you want.

Vince
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Old Mar 19, 2007, 03:04 PM
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Quote:
Originally Posted by thermlin'
DO NOT DO NOT DO NOT run DS mode on a 401 and an S3154 on 6V. and keep the tail shaft SLICK, im talking lube every 5-10 flights. i burned up my S3154 not doing these. Futaba replaced it for free, and i thankfully get another chance. im sure its a great servo (FAST!), but i apparently never gave it a chance.

Can you run the 401/9650 is DS at 6V or is this only for use with the S3154?

Thanks in advance
John
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Old Mar 19, 2007, 04:07 PM
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Can the 401 run on 6V OK and is the 9650 OK on 6V as well?
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Old Mar 19, 2007, 04:08 PM
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Christchurch, New Zealand
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Quote:
Originally Posted by Vince Herman
In my experience, both the 240 and the 401 hold the tail VERY well.
As Billy Z said, the limit is really nice to set the servo movement limits.
And I do know that the 401 pirouettes considerably faster.

I think that with your existing servo, you will see all of the benefits, unless you are into 3D, and then the Futaba 9650 servo will be what you want.

Vince
Thanks Vince,
I am into 3D but only the basics so far so I will test the waters with the 81 first and then decide if moving to digital is worth it.
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Old Mar 19, 2007, 04:48 PM
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I checked the S9650 and it is "rated" for 6v. What is the issue with the S3154? Is it only the 6v or is it only the 401 or both?

Seriously considering selling one of my 240s and try a 401 with the S9650 on a TRex. Is this the way to go and worth getting rid of one of my trusted and proven GY240s?
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Old Mar 19, 2007, 05:14 PM
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I would not run the 401 or 9650 at 6V. I remember reading about bad things happening.

The 401 and 9650 is awesome. The 9650 doesnt burn up for mysterious reasons and its super fast. I am sooo happy with that combo and so glad I didnt settle for less.
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Old Mar 19, 2007, 06:48 PM
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9650 should be fine on DS mode at 6V. nobody seems to have problems. the issue is running an S3154 at 6V with DS mode. it seems you can get away with it, and ive heard of people doing it, but you really gotta keep the tailshaft slick. mine was running 6V, DS mode, and a little sticky shaft when it burnt up. ill be running 6V with DS mode here when i get flying again and see how it goes.
try it out-if it gets a little hot after flights, switch to 5V or Normal. its not worth the risk of burning it up.
i was thinking about just getting a 9650, but this S3154 is so blazin fast im spoiled now. and if you get it locked in well, it holds like a rock.
whatever you do, keep that shaft slick, because with the lower torque S3154 vs. the 9650 it doesnt take a whole lot of stick to burn it up.
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Old Mar 19, 2007, 06:52 PM
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I've decided to get the 450SE so my funds don't allow the 401 .... yet . Sooo for now it will be the trusted 240 probably on 6v. What servo is recommended? Could I get by with an HS50 for awhile and save for the 401? I have several HS50's.
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Old Mar 19, 2007, 06:53 PM
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ive not had any experience with it, but it can WORK for hovering. i emphasize WORK because it will only do that. it has VERY little torque, and the tail will be sloppy. 3D? no. get a better, higher torque servo, even if its analog.

whew! theres a LOT of people on right now! 70 people, 48 of which are members. havent seen it this full in a long time.
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Old Mar 19, 2007, 10:53 PM
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Quote:
Originally Posted by vic20owner
I would not run the 401 or 9650 at 6V. I remember reading about bad things happening.
Rubbish!
I've been running the 9650 on 6V and digi mode for 15 months now with no probs...

..
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