Slider
Member
Posts: 30
Loc: French Camp California
Reg: 05-31-05
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 06-24-05 05:08 AM - Post#62875
Hello, I have an X-Cell 60 that has FMA S301 servos on it. The heli feels a bit sluggish and not real snappy. I was told that the servo horns were too small and didn't allow for enough travel. Are these servos even big enough for this heli and if it is the servo horns where do I get bigger ones and what size do I get. Any info would be appreciated.
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Rudy
Full Time Senior Member
Posts: 4841
Loc: Houston, TX USA
Reg: 03-14-00
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06-24-05 05:32 PM - Post#62893
In response to Slider
You should not be using that servo in a 60 size helicopter. FMA appears to no longer list/sale that servo but I was able to find out that it's just a basic ball bearing servo that puts out 41.7 oz of torque. That's to little on a 60 size helicopter. For a 60 size helicopter you want atleast 70 oz of torque.
If Wile E. Coyote had enough money to buy
all that ACME crap,
why didn't he just buy dinner? |
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Slider
Member
Posts: 30
Loc: French Camp California
Reg: 05-31-05
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06-24-05 08:59 PM - Post#62899
In response to Rudy
What servos do you recommend that wont cause me to have to morgage my house but will get the job done specially if Im am thinking of putting fuselage on this heli. I am wanting to get the Huey fuselage from Century for it.
| Get busy livin or get busy dyin |
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larrytoelle
Full Time Senior Member
Posts: 3735
Loc: Fort Jones, California .....
Reg: 01-20-03
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06-25-05 01:59 PM - Post#62918
In response to Slider
Howdy Slider,
Rudy has it right ... a standard servo is asking for a wreck on a heavy 60 size bird ... especially if you "press the envelope." The sluggishness you're describing can be attributable to a servo unable to maintain its position.
In terms of servo arm length ... that's more a function of how much throw you're comfortable with and how much throw can be employed without causing binding or "over-pitching." Keep in mind that increasing servo arm length on a standard servo will make a bad situation worse.
All of the manufacturers have suitable servos in the 70+ range ... preferrably 90+. Servo speed is another consideration as well ... something in the .20 second range seems to work well ... .15 works very well but becomes more pricey.
All of the major servo manufacturers make decent heli servos in a price range that won't break the bank. We all seem to have our favorites.
Have fun shopping and stay in touch ...
LT
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reddragon
Full Time Senior Member
Posts: 3870
Loc: Brooklyn, NY
Reg: 01-22-03
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06-25-05 02:12 PM - Post#62919
In response to Slider
Most "decent" servos will require you to mortgage your house. 
All joking aside I am away from my spec sheet right now so I can not make any definitive recommendations. You may want to try a Futaba S3010 which has about 72 oz.-inch of torque, has bearings and it can be had for the princely sum of around $25.00 USD at www.towerhobbies.com. This seems to be a good deal for you without breaking the bank. Another choice could be a Futaba S9202 which is a coreless model and it has 76 oz.-inch of torque. At $55.00 USD it is getting up there if you're on a budget but it is still a good price. The next models up the ladder are much more expensive but alas you get what you pay for. Hopefully I can stop by later with more help.
BTW: Please update your bio-LOC so that we know where in the world you're from. Thanks. 
-Wayne
Fly it like you stole it! |
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larrytoelle
Full Time Senior Member
Posts: 3735
Loc: Fort Jones, California .....
Reg: 01-20-03
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06-25-05 02:44 PM - Post#62920
In response to reddragon
Howdy Wayne,
In the 50 buck price range ... I'd have to consider a HiTec digital. I bought some 5625 metal gear last fall and put them in Falcon 50 and have flown the crap out of them. They seem to be working extremely well. At 110 ounces and around .15 ... they're a bargain for 50 bucks. They center well, are quick and they don't seem particularly tough on the battery. I like them every bit as much as the high-buck 9252 and the specs are superior. So far ... so good anyway.
I've tried other HiTec servos on planks and found them less than satisfactory ... centering problems primarily ... and a few have simply failed ... but these particular servos seem to be working very well on a heli. They're a popular servo around these parts on the larger planks ... so there's quite a few of them in use and everyone seems happy with them.
LT
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Slider
Member
Posts: 30
Loc: French Camp California
Reg: 05-31-05
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06-25-05 04:23 PM - Post#62924
In response to larrytoelle
Man thanks so much. You guys are amazing. I appreciate all the information, it really helps alot and probably saved me an expensive crash. I have two other helis I can fly while I rebuild the servos in this one so at least I'm not grounded. I thought about selling one of the birds to get alittle more money to fix this one up but what kind of sense does that make. Thanks again for the help. Is there a use for those FMA's ond something else or should I just toss em.
Oh yea and I updated my bio reddraggon...its French Camp California.
| Get busy livin or get busy dyin |
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reddragon
Full Time Senior Member
Posts: 3870
Loc: Brooklyn, NY
Reg: 01-22-03
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06-26-05 02:07 AM - Post#62936
In response to Slider
I hear ya Larry! Yep Hitec is right up there with their digitals. In fact I think they give you the most bang for your buck in the digital line up.
The sad thing is that JR does not have anything in their line that is economical (under $50) and high in torque. One of their better analog servos, the JRPS4735 (90 oz.-inch) retail for roughly $85.00. Ouch.
I can not make a recommendation on the Airtronics servos since I only have their servos in one of my helicopters. But one their higher torque analog servos 94738Z (70 oz.-inch) retails for over $70.00 USD.
Well Slider it looks like your choices are very narrow. It may be better to go with the Hitec digitals for the sheer accuracy, holding power and value. As a close runner up you would be hard pressed to find a better, more complete line aside from the Futaba servos.
-Wayne
Fly it like you stole it! |
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Anonymous
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06-26-05 02:14 AM - Post#62940
In response to reddragon
Airtronics 94738 is a digital, not analog. All ATX 947** series are digitals. Unfortunately, the "Inside Baseball" information from Airtronics is that they're discontinuing their high-performance analogs (like the 94453 analogs that I have in my EB) and focusing on digital servos.
Victims of "progress", I guess.
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reddragon
Full Time Senior Member
Posts: 3870
Loc: Brooklyn, NY
Reg: 01-22-03
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06-26-05 02:22 AM - Post#62943
In response to Buddykitchen
OOOPS. Mea Culpa. Thank you Man. 
-Wayne
Fly it like you stole it! |
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RKGDMD
Senior Member
Posts: 469
Loc: Rockland County, NY
Reg: 05-17-04
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06-27-05 03:25 AM - Post#63007
In response to Buddykitchen
Quote:
the "Inside Baseball" information from Airtronics is that they're discontinuing their high-performance analogs (like the 94453 analogs that I have in my EB) and focusing on digital servos.
That's why I bought every 451 Airtronics had in stock a couple of weeks back. 110 oz and .12 seconds is hard to find for $45. Those HiTecs Larry was talking about sound like a great deal too.
Rob
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larrytoelle
Full Time Senior Member
Posts: 3735
Loc: Fort Jones, California .....
Reg: 01-20-03
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06-27-05 02:18 PM - Post#63018
In response to reddragon
Howdy Wayne,
You mentioned the JR 4735 ... that's my favorite servo ... but I can't tell you why. I've had a set since I started this hobby and they've been whacked, rewhacked and munched several times ... but they're still on my bestest bird. The 4721 ... the high-torque version ... is also a "great" servo. If I were to have a brand new ... high-buck bird ... it would have the 4735s ... without question.
LT
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Slider
Member
Posts: 30
Loc: French Camp California
Reg: 05-31-05
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06-28-05 12:42 AM - Post#63028
In response to larrytoelle
Thanks guys I really appreciate all of the great information. Its like having a wealth of information at my fingertips. I'm trying to learn as much as I can but just when I think I'm getting smart I realize how much I don't know. Then I have to remind myself I haven't been doing this very long.
| Get busy livin or get busy dyin |
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reddragon
Full Time Senior Member
Posts: 3870
Loc: Brooklyn, NY
Reg: 01-22-03
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06-28-05 02:14 AM - Post#63031
In response to Slider
Larry I have the JR 4735s and the 4721s on my Raptor 60. They are great.
Slider drink in as much information as you can; you will need it!
-Wayne
Fly it like you stole it! |
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