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Other › Tail Servo Question
11-13-2005 05:34 PM  12 years agoPost 1
DJ ASBO

rrNovice

Surrey UK

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Hello

Can anyone tell me whether I can get away with using a Futaba 9254 digital servo on my t-rex???

I am getting a GY420 soon (along with the new rex SE) and the 9254 servo seems like it would function best with the GY240 gyro (as they are sold together)

What I am concerned about is that the servo may weigh too much and be too big to fit on my rex???

Any info would be appreachiated

Cheers

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11-13-2005 05:38 PM  12 years agoPost 2
kileak

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If you mean the GY 240, I believe it doesn't support digital servos. The GY 401 does support digital servos.

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11-13-2005 05:42 PM  12 years agoPost 3
Rum95

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Puerto Rico

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11-13-2005 05:59 PM  12 years agoPost 4
DJ ASBO

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Surrey UK

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Sorry - My mistake

It is the GY401 that I have on order.

So will the 9254 servo (that is sold with it) fit onto my Rex???

Or will the weight and size be an issue???

Cheers

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11-13-2005 07:50 PM  12 years agoPost 5
drdot

rrElite Veteran

So. California, Orange County.

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fwiw..

401 is da bomb for the Rex...I use the 965o digital mini servo, works great..9254 is a little too heavy imo, but seems like the Rex will lift it..Andy the importer is running a 9253 on on of his, reports are it works well, 9254 is the same size, but faster...

John.

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11-13-2005 09:58 PM  12 years agoPost 6
DJ ASBO

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Surrey UK

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I cant find the 9650 digital mini servo for sale in England

I don't know whether to get a different servo in order to save weight, or whether to stick with the 9650 which can be used with the GY401 in digital mode! (I think)

As you can see from the specs below, the wight difference is a big issue - about 22 grams heavier!
It is incredibly fast though - at 0.06 sec/60°

S9254 Heli High Torque/High Speed:
47.2 oz-inTorque
0.06 sec/60°Speed
Dimensions Weight - 1.6 x 0.8 x 1.4 in. - 1.7 oz.

S9650 Mini:
50.0 oz-in
0.14 sec/60° Torque Speed
Dimensions Weight - 1.4 x 0.6 x 1.1 in. - 0.9 oz.

Or of course somthing like the "Futaba S3107"
Speed: 0.12 sec/60 deg
Torque: 16.7 oz-in @ 4.8V
Weight: 0.3 ounce (9 grams)

So I am thinking that a servo weighing over 5 times what it could is a little heavy. Do you guys think that the weight would make the T-Rex SE too sluggish? Because I might get a different one

On the plus side, this setup would probably make for a rock solid tail.

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11-13-2005 10:24 PM  12 years agoPost 7
Titan520

rrApprentice

Philippines

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No I don't think so.. The Trex can lift that, I heard a couple of users having them. The GY401 can be purchased as a standlaone or with a digital servo 9254. I don't use the digital servos though, I use an HS50.

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11-13-2005 10:30 PM  12 years agoPost 8
timebandit

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In the Sticks, Oxford, UK

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>>I cant find the 9650 digital mini servo for sale in England

I got one from Midland last week

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11-13-2005 10:32 PM  12 years agoPost 9
DOKEY

rrProfessor

Northamptonshire UK

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I cant find the 9650 digital mini servo for sale in England
Try Midlands, http://www.modelhelicopters.co.uk/a...s_NewItems.html

Ryan.

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11-14-2005 12:40 AM  12 years agoPost 10
darrens

rrKey Veteran

United Kingdom

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Midlands have them in stock, I bought one Saturday and it works very well with the 401

He who dies with the most toys is the winner!

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11-14-2005 01:03 AM  12 years agoPost 11
balbs

rrKey Veteran

Los Angeles, CA

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How about this new Airtronics servo. There are threads about this being used on the tail with success. Smaller than the 9650.

94761Z

Balbs

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11-14-2005 02:09 AM  12 years agoPost 12
UH-60PILOT

rrVeteran

Seoul, South Korea

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Hey guys,

Don't get sidetracked. To answere DJ ASBO's question about the use of the bigger servos (9253 or 9254) I saw a guy flying a TRex yesterday with a GY 401/9254 combo and there is no problem with power or maneuverability. I'm currently flying a GY 240/ HS 55 combo with pretty good success and I'm doing high speed backwards and backwards inverted flight. As for using a micro digital like the 9650, don't think that because it is a digital servo that you will have the same performance as a 9253 so don't get stuck on that option. The 9253 is designed for use as a tail rotor servo and is perfectly matched with the GY 401 in mind. Any other servo you put in place of it will not work as well but will work well regardless. I think the gains you will see between the HS 50, HS 55, HS 81, 9650 will be like splitting hairs. If you are really wanting to go with a small, light servo just pick one and go for it. I think all of them will dial in and do a great job.

Now, your attention and resources may be better focused on getting a governing speed control like the Quark. I initially started with a Cool Running non governing speed control and switched the Quark last week and it made all the difference in the world on the tail. I have the head speed set at 2200 and it works great. I consistently get 12 minutes of smooth 3D flight with this set up using Thunder Power 3S packs. I hope this helps you out in your quest for taming the TRex. I love mine!!!

Kenny Thompson

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11-14-2005 06:18 PM  12 years agoPost 13
DJ ASBO

rrNovice

Surrey UK

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Cheers for the help

I have decided to get a Futaba 9650 Digital Servo for the tail instead.

I found it at Midland Helicopters, so cheers for the link.

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11-15-2005 01:37 AM  12 years agoPost 14
darrens

rrKey Veteran

United Kingdom

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Good choice and as for it being within a "hair" of a HS 50 etc etc, well I can only suggest that UH60-Pilot has no physical experience of this servo as it flies just like a full size combo with the 401 in digi mode.

He who dies with the most toys is the winner!

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