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Futaba Servos for Boat

Old 08-31-2021, 06:13 PM
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tombeck7
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Smile Futaba Servos for Boat

I'm getting back into RC boating after 40 year hiatus. I live in Colorado and am building a Prather 40" Deep Vee with K&B 40 inboard. Both new, just in storage a long time. I'm planning on getting a Futaba 4PM transmitter and R334SBS receiver. Need help picking out Futaba servos for rudder, throttle and needle, with possible future plans to put in larger boat. Also looking for best suggestions for batteries for Tx and Rx, plus charger. This is a fun boat, not for racing. Maybe later.
Old 09-01-2021, 12:38 PM
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Ron Olson
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I quit using Futaba servos years ago except for the 148 for the throttle which you could also use for the 3rd channel. I use Savox and some others off of eBay for steering. Look for 35 kg servos as they're waterproof with metal gears. 35kg translates into something like 486 oz. in. of torque which is more than enough for a very reasonable price.
Old 09-01-2021, 02:24 PM
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Hydro Junkie
 
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In my 1/8th scale unlimited hydroplane(shown in my avatar), I use the Futaba S9156 for the rudder. The write up on it is:
  • Ideal for any heavy duty loads such as control surfaces on 1/3 scale and larger airplanes and jets as well as boat rudders
  • Metal gear train eliminates backlash and slop
  • Aluminum center case helps to dissipate heat
  • Torque: 272 oz/in (19.6 kg/cm) @ 4.8V 340 oz/in (24.5 kg/cm) @ 6V
  • Speed .21 sec/60 @ 4.8V .17 sec/60 @6.0V
  • Dimensions: 1.6 x 0.8 x 1.4" (40 x 20 x 37mm)
  • Weight: 2.2oz (63g)
I've not had an issue turning the boat using one powered by a 4.8volt nicad pack. It is also standard sized so it fits pretty much all commercially made servo mounts. It should be more than enough to turn your boat though it is spendy at $130
Old 09-01-2021, 03:28 PM
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FYI, you definitely don't have to use Futaba servos just because you have a Futaba radio and receiver. There are many great options for servos out there (I typically use Savox), and limiting yourself to one brand seems silly.

There's nothing wrong with being brand-loyal, but if you have been out of the game for 4 decades, you'd be amazed at the plethora of really good (and often, inexpensive) servos that can be had from many different brands.
Old 09-01-2021, 03:36 PM
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tombeck7
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Thank-you guys for your good advice. I understand what you’re saving about venturing beyond the Futaba brand and appreciate the suggestions. For this go around, I’m just keeping it simple. As I get more experience and more connected with folks who know better like yourselves, I’ll venture into other brands like Savox. I’ve read lots of positive reviews on that brand as well as Hi-Tec. For Hydro Junkie, wow, the servo you’re using to control rudder in your 1/8 scale hydro has impressive specs, but like you said, spendy too. Good to note for beyond this boat. Thank you again!
Old 09-01-2021, 04:22 PM
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A sport 40 won't need nearly as much torque as my scale boat. If price is an issue, you might consider an S3305. It's specs are:
  • Wide usage in cars and boats that require standard size, high torque servos
  • Two ball bearings
  • 3-pole motor
  • Standard Futaba J style connector
  • One year warranty
  • Dimensions: 1.6 x 0.8 x 1.5" (1-9/16 x 16/16 x 1-1/2") (40 x 20 x 38mm)
  • Weight: 1.7oz (1-11/16oz) (47g)
  • Speed: 0.25 sec/60 @ 4.8V 0.20 sec/60 @ 6V
  • Torque: 124 oz-in (8.9 kg-cm) at 6V 99 oz-in (7.1 kg-cm) at 4.8V
While it's got less torque, it's also only $41
Old 09-01-2021, 04:30 PM
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Yes, I agree the S3305 better fits my need and budget. I’ve ordered 2 of them. Thank you for your good advice!
Old 09-01-2021, 04:35 PM
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Hydro, any reason you run nicad packs? You can get much better performance from a life, or even a lipo. I run a lipo in my thunderboat with a Savox 1210SG, and compared to that 9156, I get way more torque, and more speed, for about 3/4 the price, PLUS it's waterproof
Old 09-01-2021, 04:50 PM
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Actually, I run them for a couple of reasons
  1. I already have several and they work well for what I need
  2. The instructions that come with the S9156 specifically calls for nicads.
I know, LiPos, LiFes, and several other types have better numbers and most swear by them. I, on the other hand, have never been one that jumps at the latest and greatest just to keep up with the guy next store. I have one LiFe pack and that is in one of my transmitters. Charged it three years ago and it's still got a good charge in it. My other transmitter has a battery holder with AA batteries in it. Both work fine, no need to spend money on another LiFe pack since I only can use one at a time.
Old 09-11-2021, 02:11 PM
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Ron Olson
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Shop eBay. 35 kg servos put out 486 oz. in. of torque with metal gears and are waterproof. These are what a lot of crawler trucks are using and you might not believe how cheap they are!

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