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It's hard to find a good quality low-profile servo to steer some of our smaller cars (like an M-chassis or a cramped electric tourer).
Futaba makes one and now KO Propo makes one, but these cost more than the car I intended to put them into, so I looked around for a
cheaper alternative and found the Bluebird BMS-705MG. On paper, it has metal gears, a decent amount of torque, a respectable speed,
is analog and costs a fraction (a quarter to be exact) of what the Futaba costs. Since I was already paying for shipping, I bought two.
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The servo really is very short, but I found that it's a bit wider and thicker than normal servos. On my M-03, I had to make some new servo mounts to fit it. Also, to my disappointment, I have not found a single touring car that it can fit in. The one in my M-03 Mini Cooper stripped a gear, but to be fair, I had a good amount of crashing in the car and by the time I realised the servo had stripped, my chassis was cracked and my steering rod was bent. |
| Here it is in the DF-03. I had to mod the chassis a little, but the servo fit very well after that. Read more about the mods on my DF-03 page here. |
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Conclusion: It's a decent servo for the price but beware of the extra width, which might make it difficult if not impossible to fit in some cars. Also, it strips gears easier than the Futaba and KO.
Update Jan 27, 2010: Now that many other manufacturers (Sanwa and Savox to name a few) are also making good quality low profile servos, I can no longer recommend this servo to anyone. Spend a little more and get something much more durable. Check our Servo comparison chart for info on other low profile servos.