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  1. #1

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    help with mix digital servos / a123 batt.

    i have some brand new futaba S9252 servos that I wanted to use with my new vanquish. All the other servos are 6.0. I want to go to a A123 rx batt system. Is there a regulator out there that will accomadate this and with the 6.0v servos would that cause a problem with them. Hate to have to order another two servos. budget getting a little tight.

    HHHHEEEEEELLLLLPPPPPP (grin)_

  2. #2

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    RE: help with mix digital servos / a123 batt.

    Tech-Aero dual reg and 2 x 400mAh LiPos.

    Light, redundant, reliable.
    Bob

  3. #3

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    RE: help with mix digital servos / a123 batt.

    Are you saying that all other servos are to be used 6.0V?

    All the servos in the market with the exception of High Voltage servos, do work just fine on 4.8v or 4-cell NiCd.

    Make sure to remember the S9252 servo IS for 4.8V
    Since almost all the 4.8v rx packs come out of charger above 6V, but drops quickly. I wouldn't go any more than 5.2volt as in Heli gyro.

    Tech Aero regulator has lowest voltage of 5.75. I use those on my JR standard digital servos that have 6.0v spec.
    So, even setting the regulator to lowest setting may not work. PLR5-DR2 or other Tech Aero regulators have default 6.2V which I think too high for the S9252.

    SPECS for S9252

    Speed: 0.14 sec/60° @ 4.8V
    Torque: 92 oz-in (6.6 kg-cm) @ 4.8V
    Weight: 1.8oz (50g)
    Power Supply: 4.8V (Futaba does not recommend using 6V)
    Dimensions: 1.6 x 0.8 x 1.4" (40 x 20 x 37mm)

  4. #4

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    RE: help with mix digital servos / a123 batt.

    Jaccio has 5.1 regulator
    maxx products has a few regulators with adjustability.
    Castle BEC will also work.

  5. #5

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    RE: help with mix digital servos / a123 batt.


    ORIGINAL: PatternFlyer

    Jaccio has 5.1 regulator
    maxx products has a few regulators with adjustability.
    Castle BEC will also work.
    I've been using JACCIO regulators since they came on the market.
    I've never had a problem or a failure of any kind with them.
    You can't get any lighter or more reliable.
    Forget Mixing Your Own Fuel....It's Easy But No Longer Needed!

  6. #6
    Jetdesign's Avatar
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    RE: help with mix digital servos / a123 batt.

    ...
    Joe Marri
    Enjoying all things aviation.

  7. #7
    woodie's Avatar
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    RE: help with mix digital servos / a123 batt.

    I used S9252s for several years at 6V thru a 2 cell lipo and Jaccio 6V regulator. No problems.

    Woodie
    There is nothing so simple it can't be messed up by someone....

  8. #8

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    RE: help with mix digital servos / a123 batt.


    ORIGINAL: woodie

    I used S9252s for several years at 6V thru a 2 cell lipo and Jaccio 6V regulator. No problems.

    Woodie
    Early on when I was checking out aileron servos for my Sickle I was concerned about using the Futaba S9154s, which are also rated at 4.8v. Archie Stafford assured me that he had run them for years in glow models at 6.6v with zero issues after many hundreds of flights. Servos in glow models work a lot harder on a constant basis simply holding center against the vibrations of the engine, so after this advice I had no qualms about using them in an electric at 6v. Close to 500 flights later, no issues.
    Bob

  9. #9

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    RE: help with mix digital servos / a123 batt.

    ORIGINAL: cmoulder


    ORIGINAL: woodie

    I used S9252s for several years at 6V thru a 2 cell lipo and Jaccio 6V regulator. No problems.

    Woodie
    Early on when I was checking out aileron servos for my Sickle I was concerned about using the Futaba S9154s, which are also rated at 4.8v. Archie Stafford assured me that he had run them for years in glow models at 6.6v with zero issues after many hundreds of flights. Servos in glow models work a lot harder on a constant basis simply holding center against the vibrations of the engine, so after this advice I had no qualms about using them in an electric at 6v. Close to 500 flights later, no issues.
    Hi Bob....yep , that can be done for sure but I always want to keep the servos at the same speed for slightly more predictable response...I use 5.8v....I need everything I can get!
    Forget Mixing Your Own Fuel....It's Easy But No Longer Needed!

  10. #10

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    RE: help with mix digital servos / a123 batt.

    Combined with 9650's on the elevators and a 9155 on rudder, they are all plenty fast!

    At my skill level (or lack thereof) it doesn't seem to be an impediment.

    My main model now is a Caelestia with ATX 94774 (ail), 94761Z (el) and 94775 (rud) which are also pretty fast.

    I hope some day to be able to afford some BLS all 'round, just for the experience.
    Bob

  11. #11

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    RE: help with mix digital servos / a123 batt.


    ORIGINAL: cmoulder

    Combined with 9650's on the elevators and a 9155 on rudder, they are all plenty fast!

    At my skill level (or lack thereof) it doesn't seem to be an impediment.

    My main model now is a Caelestia with ATX 94774 (ail), 94761Z (el) and 94775 (rud) which are also pretty fast.

    I hope some day to be able to afford some BLS all 'round, just for the experience.
    Oh yeah...for sure.
    But....the reason for the regulator is to keep the servo speed the same regardless of the battery voltage.
    This way....the servo speed/response is the same from the beginning to the end of the battery.
    With the electric stuff we are doing now I sometimes put as many as 17 flights in a 6 hour period....and the speed of the servos never changes due to the regulator.
    I use a Hyperion A123 2s 850mah battery.
    At 60ma per flight I can get 9 safe flights before replacing the battery. I've done as many as 10 flights all in a row of Masters pattern but I thought my neck was a bit too far out there so I cut back to 9 flights.
    You better believe I keep close count on a piece of paper!
    Forget Mixing Your Own Fuel....It's Easy But No Longer Needed!

  12. #12

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    RE: help with mix digital servos / a123 batt.

    If you like to do that many flights in a day, there is another option...

    From personal experience, at least three times a redundant Rx power supply has saved a model, so I always use a redundant set-up. For the Caelestia I am using a Dimension Engineering VHV (Very high voltage) BEC (@ 6v) as primary and a Tech-Aero reg/350mAh (@ 5.75v) LiPo as back-up. This actually saved the Caelestia for me when a defective arming plug burned out (not properly crimped, photos below) and I was able to deadstick safely. Without the back-up, the Caelestia would have been a goner.

    Even then, I check the back-up battery voltage every few flights with a 0.5-amp load.
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    Bob


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