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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Need some input on a HDS-877 Digital Micro Servo
02-12-2006 05:56 PM  12 years agoPost 1
rickc

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Creve Coeur IL. (Peoria Area)

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I purchaces a new digital micro servo from Heli Direct for my 3D-X400. The box is marked Hobby Electronics or (HE). The servo model is a HDS-877. The box also says IC-SERVO. Well my thought is that this servo being about the size of a Hitec H-50 and then being digital is that it would be a good choice for a tail servo for my micro heli. This way I can run my 401 gyro on digital mode. The specs seem good.
Specifications:

1.Type of Gear :Metal & Nylon
2.Motor Type :Ferrite brush motor
3.Operating Voltage :4.8v - 6v
4.Neutral pulse :1.5 ms
5.Travel angle :40-45 degree at +/-400ms
6.Dead Band :1-2ms (Adjustable)
7.Speed :0.11(sec/60°at 4.8v)
8.Torque :1.2(kg/cm at 4.8v)
9.Weight :10g
10.Size :21.8 x 11 x 19.8(mm)

My question is.... is anyone running this servo and how dependable is it? I don't want my micro heli to be a gini pig.

Rick

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02-12-2006 06:03 PM  12 years agoPost 2
Dorset Boy

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Dorset England

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Yep you can run this servo in super servo mode
I have three of these on the tail all running in super servo mode on csm 560s

Trev

Century Helicopters, Coolpower Fuel, Flight Power Batteries, CSM Gyros, Futaba from Hobby Hangar

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02-12-2006 06:05 PM  12 years agoPost 3
z11355

rrMaster

New England

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I have three of these on the tail
WOW

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02-12-2006 08:00 PM  12 years agoPost 4
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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Look closer and you may find a recommendation to not run this servo in DS mode as it may still burn it up quick. I know I've seen retailers warning against it and I've heard it performs great in standard mode anyways.

(but people may have just been turning the gain up too high in DS mode though)

I'll get around to trying this servo out for myself one of these days.

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02-12-2006 08:12 PM  12 years agoPost 5
Dorset Boy

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Dorset England

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[quote Look closer and you may find a recommendation to not run this servo in DS mode]
Now I'm not saying your wrong but what do you base this statment on?

The Uk supplier CSM who know a little about servos and gyros told me this servo would be fine in super servo mode.

We have three helis that have been running this setup for a year now
doing HARD 3D with no ill afects.

Trev

Century Helicopters, Coolpower Fuel, Flight Power Batteries, CSM Gyros, Futaba from Hobby Hangar

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02-12-2006 08:16 PM  12 years agoPost 6
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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I swear Modefo's used to have a warning about using this servo in DS mode. Maybe it's just in combination with the 401 that they burn out quick.
(or maybe it sprung from people using too high a gain in DS mode)
(I notice the warning isn't there anymore so it may have been a hoax)

Found this post offering similar precautions:
http://www.runryder.com/p1767661/?h...yTypeS#p1767661

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02-12-2006 08:23 PM  12 years agoPost 7
Dorset Boy

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Dorset England

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Like I said you may well be right and I would hate to recomend somthing that would cause problems for another pilot.

We have found unless you are pushing hard backwards then ds mode is not needed anyway. But for what we are using this servo for then ds mode is all that will lock the tail.

Trev

Century Helicopters, Coolpower Fuel, Flight Power Batteries, CSM Gyros, Futaba from Hobby Hangar

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02-12-2006 08:31 PM  12 years agoPost 8
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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Well they are certainly plenty cheap enough to take the risk (to the servo itself anyways) and everyone says they perform great in standard mode wether or not they hold up in DS mode. So I don't see any reason not to use this servo at all, I just thought I'd pass along that precaution I'd been seeing.

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02-12-2006 08:37 PM  12 years agoPost 9
Dorset Boy

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Dorset England

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Agreed
one thing I will add to the mix.
After a lot of testing imo the 577 servo is worth a look at.
A lot better hold with only a small increse in weight

Trev

Century Helicopters, Coolpower Fuel, Flight Power Batteries, CSM Gyros, Futaba from Hobby Hangar

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02-12-2006 08:48 PM  12 years agoPost 10
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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It will likely be my next tail servo. I just wasn't going to use it in DS mode from all I'd been hearing. Since you claim not to be having issues in DS mode, I may try it myself as it wouldn't be the first time I've crashed from tail failure if it does happen to burn up. My gyro is a 401 though, so I'll just see when the time comes I guess.

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02-12-2006 08:51 PM  12 years agoPost 11
Dorset Boy

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Dorset England

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What type of flyin are you doing with it?
We found with the 577 we needed a lot less accelaration gain
and the overall hold is a lot better.

Trev

Century Helicopters, Coolpower Fuel, Flight Power Batteries, CSM Gyros, Futaba from Hobby Hangar

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02-12-2006 09:04 PM  12 years agoPost 12
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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Well so far nothing I really need a strong hold for, mostly semi-stationary tumbling about. I've kinda hung it up for simming over the winter but have designs for more sideways/backwards flying next season.

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02-12-2006 09:15 PM  12 years agoPost 13
Dorset Boy

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Dorset England

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You do your self a diservice flips sideways and backwards flying is not easy.
you will be fine with normal mode then try ds mode only if the hold is not good. but you knew that anyway.
good luck with the backwards flying once you have cracked that it opens up a whole new set of manouvers for you.

Trev

Century Helicopters, Coolpower Fuel, Flight Power Batteries, CSM Gyros, Futaba from Hobby Hangar

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02-17-2006 01:45 AM  12 years agoPost 14
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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I ran accross this review but it's not dated and he doesn't give any details about his settings.

http://www.trextuning.com/hds-877.php

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02-17-2006 10:57 AM  12 years agoPost 15
Yug

rrMaster

UK. Herts

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I run my 877 with a 560 in ds mode - great performance once the gyro parameters are dialled in correctly.

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02-17-2006 04:35 PM  12 years agoPost 16
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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Tested and approved by CSM for use with SL420 and SL560 micro gyros in running in high speed DS mode.
No such statements about GY401s though.

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02-17-2006 04:41 PM  12 years agoPost 17
nivlek

rrProfessor

Norfolk England

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The UK importer is actually Ashtek Electronics , and they are now not recommending the servo fo hard 3D . There is a thread on RC Model Flyers , where Ashtek is looking at fitting the digital side of the 877 on to a Hitec motor .

http://www.rcmf.co.uk/4um/index.php?topic=24756.0

At the end of the day , it gets dark .

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02-17-2006 04:52 PM  12 years agoPost 18
Yug

rrMaster

UK. Herts

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Oh, thats news. What's the problem I wonder.

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02-17-2006 04:55 PM  12 years agoPost 19
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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Probably that the 877 motor is burning up like I've been hearing about.
(stall current doing the burning though it looks (poor tail setup?))

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02-17-2006 05:30 PM  12 years agoPost 20
nivlek

rrProfessor

Norfolk England

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Yes , it is due to the motor burning up . The Hitec servo being used for the Frankenservo is the HS65 .

At the end of the day , it gets dark .

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Need some input on a HDS-877 Digital Micro Servo
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