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Old Jan 21, 2014, 01:43 PM
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Futaba FP-S148

FIrst of all thank you for having me, I'm usually posting on an other site in the helicopter section. I started out with sailplane years ago and loved them. Been playing with heli's lately but plan to go back so here is my question.

I have an old radio I was thinking of selling on eBay, but I started thinking I may want to keep it just for the servos. This is an old 72mhz 6 channel Futaba. It has 4 FP-S148 servos in it. I know these are not high end servos, but for a thermal plane they may work. The plane I thinking of putting them in is an old Airtronics Aquila. I started this project years ago, and planned on making it a show piece. Put a lot of hard work into it. Just got sidetracked with life and have yet to finish it. I also have a small slope soarer I could put two of them in.

Anyway is it worth keeping them? Just as a side note they're over 15 years old. Sorry for the long winded post.
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Old Jan 21, 2014, 07:30 PM
more casual than stylish....
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I have shopping bags full of servos like that. Test them and use them. And post a pic of that Aquila.
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Old Jan 21, 2014, 08:38 PM
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Don't risk an Aquila by using them , I too had a gaggle of them that lay in storage for a very long time . When I recently decided to thin out the inventory , I tested them . They all failed . They chattered, jittered, or just wouldn't do a damn thing . Trash 'em , new servos would be the best bet .
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Old Jan 21, 2014, 09:19 PM
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Quote:
Originally Posted by slopemeno View Post
I have shopping bags full of servos like that. Test them and use them. And post a pic of that Aquila.
I haven't finished the plane yet. Needs final sanding, covering and radio install. I'll be using an Aurora 9 for the radio. Just have to get the time and gumption to finish her. I'm actually surprised that anyone remembers that plane. When I got it, it was the plane to have. I also have an old Ridge Rat slope plane pretty much ready to go.

Quote:
Originally Posted by jetmaven View Post
Don't risk an Aquila by using them , I too had a gaggle of them that lay in storage for a very long time . When I recently decided to thin out the inventory , I tested them . They all failed . They chattered, jittered, or just wouldn't do a damn thing . Trash 'em , new servos would be the best bet .
Yeah I was feeling the same way that's why I asked. I think I'll put out a little money and buy new. Nothing high end just a good servo.

Thanks for the advise guys!
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Old Jan 22, 2014, 03:11 PM
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I use Hitech 225 MG's on most of my stuff , never had a problem . Metal gears just make me warm and fuzzy .
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Old Jan 23, 2014, 01:40 PM
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Its weird how the old 148s just fail like that. I had the same experience when digging through some old ones while looking for a servo for a Coyote. I wonder what causes it...do they corrode inside?
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Old Jan 23, 2014, 03:46 PM
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I've had way better luck with 148's than the modern replacement from Futaba.
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Old Jan 23, 2014, 04:53 PM
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The reason that they fail like that , at least I'm told , is that the elements within the feedback pots corrode where they come in contact The suggested way to minimize the problem is to rotate the servo to an end stop , then store it away in a sealed baggie. I can't swear by all that but it does make a degree of sense .
Back in the day it wasn't uncommon to have a dead spot on something like a volume control .
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Old Jan 23, 2014, 10:11 PM
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In all seriousness, don't risk a nice model like an Aquila on a $14 servo. Same goes with batteries. You can replace all three servos and get a modern equivalent battery for way less than $100.

Digital servos have replaced analog servos in the past 15 years. They generally are faster and have more torque than analog servos. You will be much happier if you use current generation servos in your model.
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Old Jan 23, 2014, 10:29 PM
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What he just said .
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