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HelicopterGasser Model RC HelicoptersOther › Engine vibration might be a good thing
09-02-2012 03:04 AM  5 years agoPost 1
Toadster25

rrKey Veteran

Iowa

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I was flying today and when I got down close to the ground I flipped the throttle hold and floated down. When I did that I noticed the heli seemed to kind of pitch back when I added in collective. I walked up to the heli and one of the three ccpm servos wasn't moving. As soon as I throttled back up the servo started working. It looks like as long as the engine was running full speed the vibration kept the servo moving but when I idled down it quit. These are jr8311 servos. I guess it is time to get three new servos. What should I get? I'm thinking maybe the DS8231 since it isn't quite as pricy as the DS8711. I wouldn't think I would need that much torque for my Spectra and my flying style. Any other ideas for servos. I also just use a 4.8V nicad battery so I probably don't want servos that use a lot more power or I'll have to upgrade my battery setup.

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09-02-2012 03:51 AM  5 years agoPost 2
Mr.HillBilly

rrVeteran

Salesville, OH - USA

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I hated to do it but I picked up some BLS253 about 4 1/2 years ago and they have worked perfect. They were still running strong but developed a good bit of slop so I just replaced them with the BLS255. My BLS251 died at IRCHA this year (still worked but very weak) so I had to replace it with a BLS256 but it was about 4 1/2 years old also.

They are pricey but they are like the Energizer Bunny they keep going and going.

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09-02-2012 04:56 AM  5 years agoPost 3
rbort

rrProfessor

Franklin, MA - USA

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+1 on Hillbilly

Buy BLS servos, they are worth the extra money you were super LUCKY you didn't crash.

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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09-02-2012 12:58 PM  5 years agoPost 4
wrongler

rrProfessor

Brewerton, New York

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I don't think you can go wrong with the futaba servos, But it doesn't hurt to look at the Hitec for less $$$, Have used a few of them and have not had any issues.

Bill Whittaker

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09-02-2012 02:34 PM  5 years agoPost 5
Toadster25

rrKey Veteran

Iowa

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I've been doing a little reserch to see which servo would be the best for me and found these two. The BLS253 for $149.99 and then I found the BLS451 for $104.99. Looking at the specs I don't see much difference but I'm not sure if the gears are metal in the 451. I think I might go with the BLS451. Any thoughts on this servo?
http://www3.towerhobbies.com/cgi-bi...p?&I=LXUZE9&P=7
http://www3.towerhobbies.com/cgi-bi...p?&I=LXRJS5&P=7

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09-02-2012 03:35 PM  5 years agoPost 6
Doug Darby

rrVeteran

Dallas, Texas

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The BLS451's work good. I have a set I have been flying on straight 2S LiPo for over a year with great results.

doug

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09-03-2012 04:02 AM  5 years agoPost 7
Mr.HillBilly

rrVeteran

Salesville, OH - USA

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I ran the BLS253 on 2 cell LiFe and never had any probs. If you ever wanted to go to high voltage system now would be the time since you are replacing cyclic servos.

The Fut. 400 series servos are designed for cars and trucks, the 200s are designed for helis. BUT I have always seen good posts about the 451s. I have never taken out a set of gears on my 253s even after a lot of hard crashes. I am hoping the 255s will hold up as well.

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09-08-2012 04:10 AM  5 years agoPost 8
Toadster25

rrKey Veteran

Iowa

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Well I ordered and got the bls451. I think I may have found the main difference. They don't come with the same servo horns but one of the horns should work fine. I also think the wire pigtail is a little shorter. The top servo wire is going to have to be spliced and lengthened. That is ok though because now I can switch the connector to a JR end. I hate trimming the Futaba connectors to fit but I think all my electronics on the heli are Futaba except the receiver and transmitter now. Crazy... I guess I should buy Futaba radio next time.

Anyone want to buy some very used jr8311 servos?

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09-08-2012 04:12 AM  5 years agoPost 9
Justin Stuart (RIP)

rrMaster

Plano, Texas

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If you can find some brushless "hall effect" servos, they should last forever. The hall effect sensors are an improvement over the potentiometer because there is nothing touching. They should be very vibration resistant. I'm not sure what servos are using this technology now, but there are dozens of new servos coming on to the market as we speak.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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09-10-2012 04:18 AM  5 years agoPost 10
Toadster25

rrKey Veteran

Iowa

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Servos are expensive! I bought the 451 servos. I think the wire pigtails may be shorter and the servo horns that come with them are probably the best for heli use but they seem to work fine. I've decided to do away with the extra servo supports that I was using. I don't think they are needed and might just transfer more vibration to the servo. I also had to cut and lengthen the top servos wires but that is okay because I don't like how the Futaba connectors fit into a jr receiver. All my electronics are Futaba except the transmitter and receiver. I think if I ever buy a new radio I should buy Futaba.

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