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BMS-385DMAX Digital Servo (Metal Gear) 4.2kg / .15sec / 16.5g
BMS-385DMAX Digital Servo (Metal Gear) 4.2kg / .15sec / 16.5g
This servo is designed to be used in R/C glider applications. By using carbon nylon gears and optimizing the curvature of the gears, the gears are able to withstand large amounts of force. The servo will automatically learn the users transmitter pulse timings and lock into the signal every time. The servo also includes a signal buffer in the CPU with fail-safe functionality. The servo comes with an accessory package and the universal JR/Hitec "S" Connector which is physically and electrically compatible with all major receiver brands sold worldwide.
1. M9.6 ball bearing (si-oil) 2. Extra Strong torque with low signal affect and success get CE certification. 3. Rubber seals for waterproof case 4. Designed to be used in R/C glider applications. 5. Futaba compatible 25-tooth aluminum 6061 output splines 6. Digital motor drive with ultra-square PWM signal 7. Automatic determination of servo center pulse width 8. Metal gears of aluminum 6061 material combined with light and strong C95 material 9. Fail-Safe function 10. Digital control IC - SOP package with 12bit data transfer 11. MOS-FET motor driver chips that can handle 7A peak loads 12. Useable on 6.0V
Weight: 16.5grams / 0.59oz Dimensions: 26 x 13 x 26 mm / 1.16 x 0.51 x 1.02 inch Torque At 4.8V: 4.2kg/cm , 57 oz/in Torque At 6.0V: 4.7kg/cm , 62 oz/in Speed At 4.8V: 0.15sec / 60 deg at no load Speed At 6.0V: 0.13sec / 60 deg at no load
This is getting really annoying, like I've been waiting for almost 2 month and there's still no estimated delivery date. This is just really getting annoying
I'm going to use the HS-82MG. Its analog, but its a very high quality metal gear Hitec servo. Check out this guys video, he's using one on a tri with a KK2.0 and a very simple yaw mechanism.
The BMS-390DMH looks pretty good. We are using them a couple of RCexplorer v2.5 builds. A little more torque, few grams heaver and a little faster.
...Except after I started typing this I checked and they are now back ordered as well. Must have placed just in time.
Using this servo on the V2.5 Tri is not recommended. the adverse yaw motion and force needed to correct and steer the tri Is a little too much when using the DT700 Motor. A larger servo is recommended. I am using a 1:10 scale steering servo. the DT700 is more than enough to carry the extra weight and Piece of mind. This servo Is very strong and well built but be sure to purchase a replacement gear set when ordering.
Yes same one. I had a blade strike and a gear stripped. I just expected more rigidity. As before make sure to order a replacement gear set so you aren't downed while waiting for a replacement. Cheers!
Good day,
I have used one of these in a Tricopter build, but only after a few flights seems to have burnt out its Amplifier/Control board. Is it possible to replace these boards?
Appreciate the help!
Hi If the control board burned out, it's usually two things to consider. 1st Ensure that your application is easy to operate! Is it heavy, it is usually the reason it burns up. 2nd If it is easy, but still burns the servo is too weak. Change to a stronger!
Then there is the issue of brand! In this case, BMS, I have last year purchase several pieces of it. They have simple tasks, such as driving a throttle. But basically all the servos of this model has overheated and burned up. BMS seems t
Hi folks, I've ordered this servo as it was on the shopping list of the tricopter v2.5 that i want to build. But this servo is back ordered since long time.
Is there any other you would recommend instead?
Thanks
For my tricopter v2 build I used a Turnigy metal gear servo, which worked great with the previous yaw mount. I eventually lost it to rain (whihc the BMS is water tight). I honestly don't see anything as good as the BMS for the price, but I'd search for "metal gear digital servo" and try and find something with similar specs. I've seen a couple of people using the TGY-375DMG for this kind of direct drive yaw mechanisms and they work great.
Hi, i need some spare servo arms (cross) for this servo, are there some compatible ones here on HK? i was looking for some at several hobbystores in my area and non had compatible ones... :/
i was wondering if theese: product id: MI-SERV-HORN
will work?
any ideas?
thanks in advance!
cheers!
Servos basically come in 3 different sizes (micro, standard, and giant or 1/4 scale). This servo is a standard size, so almost any sevro arm made for a non-micro or non-giant size servo will work. I'm pretty sure "HobbyKing Mi Servos" means micro, but I'm not completely sure. If you have any spare arms, anything will fit this servo that is not micro or giant. Otherwise you may have to shop somewhere elsewhere. hobbyparts has a bunch of cheap servo arm sets that will work for you.
ahh ok, thanks!.. well i found some servo arms at home, that have the same diameter and also would fit, BUT the teeth inside do not fit... i also went to a hobbyshop and asked them for arms for this specific servo, we tried some there, but same problem, size was ok, but the teeth inside did not fit..
so are there some "standards", concerning the "teeth" of servo arms? or has every company its own standard?
cheers!
There's at least 4 common servo spines, 21-25 teeth you're bound to run into, since it's hard to count the teeth manually it's pretty much trial and error. ***mer that your hobby shop doesn't stock 25 tooth - say Futaba brand servo horns (which is exactly what you need), sorry it was so much trouble for you. Hope you find exactly what you need here: *******servocity****/html/futaba_arms_horns.html , these should be 100% compatible with a standard size 25 tooth servo like the BMS-385DMAX.
Hi folks, I am not an expert in this hobby nor in electronics and I need a help. I got three of these and two of them make a "flying beatle" noise at centered position and without any Tx input. It is not a high volume noise but I never experienced this before. I bought several servos (usualy turnigy and original futaba), both analogic and digital and they are absolutely quiet with Tx stick at neutral position. I think these noisy ones are NOT OK. I am not confident about them. Does someone can tell me why the servo is "buzzing"? Servo does not move with Tx sticks at neutral position, but is behave like it is getting signal from Tx. Can I fix it by myself or should I return them to HK? Many thanks.
Don't worry too much about it. Digital servos commonly hum at centre, particularly if there is a little load on hinge (line not straight)or tight linkage. The noise is amplified by the covering on model. The buzz is the servo trying to get to neutral.
Marcus you are right they hum at centre. However as i said this is common with digitals. caused by the low deadband at centre. It is not as obvious when servo is not mounted in model. I have found that it is not a problem. I have a lot of models with various brands of digital servos and they all have this noise to some extent.
HOBBYKING needs to put a flag on across the main graphic for this part, and that is it stays on backorder for LONG periods.
I understand HK offers the email function, however that gives no indicator you could be waiting for several weeks.
Koupil jsem dvì na zkoušku do modelu F3X na klapky.zatím jsou výborné a fungují jak mají!Rozpìtí modelu je 3000mm a váha 3200g. info: ****boban.websnadno.cz sekce f3x modely Boban
Bought three of these and two of them make a "flying beatle" noise at centered position and without any Tx input. It is not a high volume noise but I never experienced this before. I bought lots of servos, both analogic and digital and surely these ones (66pcnt !) are NOT OK. I am not confident about them and I will not risk a plane with these servos.
2 comments. Reply..
Overall Rating
kurtus420
111 likes
Value
UNRATED
Quality
UNRATED
44 thumbs up!
I bought 1 and it showed up DOA, the gears were completly jammed in it. Sent it back 40 days ago and haven't received anykind of response from hobby king yet. Giving it 3 stars for the fit and finish but I never got to test it so I can't do a 5 star rating.
No comments. Reply..
Overall Rating
Karl
28 likes
Value
UNRATED
Quality
UNRATED
17 thumbs up!
The auto-centering of these servos is terrible. They cannot find the Center and so they hunt and make a high pitch buzzing noise. I do not trust these in my glider and so will throw them in the bin. Waste of time and money if you buy these servos.
No comments. Reply..
Overall Rating
malcomx
101 likes
Value
UNRATED
Quality
UNRATED
16 thumbs up!
I bought 2 of those, 1 was burned during third flight, plane was almost crashed, second one I put to the trash for prevention. Don't recomend to buy.
2 comments. Reply..
Overall Rating
guillaumeM
24 likes
Value
UNRATED
Quality
UNRATED
16 thumbs up!
J'ai command 4 servos et il crame les un aprs les autres je vais les changer avant le premier vol! Je pensais mettre un peu plus cher et en avoir des meilleurs et c'est faux!:( Premire fois que je suis du du matos de HK
I ordered 4 servos and it burns one after the others I am going to change them before the first flight! I thought spend more money for having best quality and it's wrong!:(First time when I am disappointed by HK product
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