Futaba 3151's

945 Views 5 Replies 4 Participants Last post by xjet, Nov 13, 2004

Jim D

Discussion Starter · Nov 12, 2004

Anybody tried these 'bargain' digitals yet? What do you think? Good for 40-size profiles? Any better than a 9001 on 6 volts?

I've also been running some JR DS811's but they love to chatter on weighted surfaces (ailerons).

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dhooks

· #2 · Nov 12, 2004

I have a friend that has some....he's pleased with them FWIW.

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basmntdweller

· #3 · Nov 12, 2004

I've only played with them on the counter in the LHS. Specswise, they aren't any different than the S148s. Probably the same servo with a digital amp. I wouldn't pay for the extra advantage of digital.
On the bench, they didn't feel like they had the holding power like other digitals I have played with and they were relatively slow.
Matt

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xjet

· #4 · Nov 12, 2004

I bought 12 of these in ServoCity's 2 for 1 deal (so they ended up costing about $19.99 each -- pretty damned cheap).

They are just an S3001 with a digital amp so don't expect them to be any faster or stronger than an S3001.

Unlike Hitec digitals (my only frame of reference) they're pretty much indistinguishable from a regular non-digital servo unless you load them up. That is to say they don't "sing" like a hitec digital does when moving.

So far they seem to work just fine though -- bearing in mind that they are just a .23 second / 56oz-in ball-bearing servo at heart. They certainly appear to have a better holding torque and centering under load than the S3001 though.

Since the S3001 itself is selling for $19.99, the ServoCity deal on these digitals seems like a steal.

The next-cheapest digital I've found is the Hitec HS5475 which seems about the same speed but is a little stronger at 76oz-in -- albeit at an extra $15 per unit.

I'm not a great fan of Futaba servos (although I also like the S9001 with its coreless motor and reasonable price) but at ServoCity's prices, these are good value if all you're after is a sports-servo.

Will they work on a 40-sized profile?

If you're currently using S3001, S3001 or HS425 servos then yes, these'll do the job a little better at little or no extra cost (providing you buy from Servo City).

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dhooks

· #5 · Nov 12, 2004

xjet said:
The next-cheapest digital I've found is the Hitec HS5475 which seems about the same speed but is a little stronger at 76oz-in -- albeit at an extra $15 per unit.quote]

I talked with Mike from Hitec......he seems a little gun shy of the 5475s for a very rigorous application. My decuctions are that the gear train (same as the 475s) may be getting a little stressed at the higher torque levels. Thats just my deductions not a quote from him. I think on a .40 sized plane though they would work great.

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xjet

· #6 · Nov 13, 2004

I've got them on the ailerons of my Katana P and they seem to work fine.

I've heard of a couple of big-birds lost to geartrain failure on the 5475s though, which is probably why Mike's quick to caution.

The gears in them are a shirt-load stronger than those in the HS225 though -- so if they're happy to rate the 225 at 66oz then I see no reason why the 5475 should be considered (by Hitec) to be weak

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