IOMICA Forum

Does anyone know where I can get one of these?

http://www.hitecrcd.com

Hitec HSR5995TG
25kg torque
0.15 sec
180 degrees
62g
40 x 20 x 37

Could this be the ultimate sail servo servo?

Try http://www.servocity.com/html/hsr-5995t ... orque.html

They have them in stock.

/) Rey

Incredible specs! With a 6 cell NiCd pack (and "heavy duty" connector cable!):

Operating Speed (7.2V): 0.12sec/60 degrees at no load
Stall Torque (7.2V): 417oz/in. (30kg.cm)
Current Drain (7.2V): 380mA/idle and 5.2A at lock
Weight: 1.97oz (62g)

You can also find it here. Heinz has it in stock:

http://www.rcsegel.de

and then check the news section.

I have been using a 5995TG for about a month now. It replaced a 5735MG. One word: awesome!

A couple of lessons learned that might be useful to anyone considering using it.

1- Unlike the 5735, the 5995 comes pre-programmed for 180deg travel. I made the mistake of using the Hitec programmer to set the travel to 180deg of travel and I had all sorts of problems, including current spikes. Resetting the servo to factory specs gave me the 180deg travel and cured the problems. I used the ATV in Tx to fine tune the travel.

2- The case of the 5995 gets warmer than that of a 5735.

3- Like the 5735, the stall current is quite high and can damage batteries that cannot handle that rate of discharge.

A couple of specs of interest, one of which is incorrectly stated in many web sites:

HSR-5995TG @6V
Torque: 333.29 oz.in
Idle current: 3mA no load
Running Current: 300mA no load
Stall Current: 4200mA

HS-5735MG @6V (for comparison)
Torque: 263.85 oz.in
Idle current: 3mA no load
Running Current: 840mA no load
Stall Current: 4800mA

Rey

Hi,

I heard that 5745MG replaced 5735, with similar specs, except that it is in a metal, waterproof case.

Has anyone used it, and what to say compared with 5735 and 5995?

Brgds.

No answer?

I have only ever used the 5735 so my comments are based on what have read and people I have spoken to rather than actual experience. As I understand it the 5745 has replaced the 5735. My 5735 was very good until my boat got into trouble and it melted possibly due to it being stalled or perhaps water ingress. My advise therefore would be to fit a fuse as recommended by Ken Binks. The 5995 on paper and according to this forum appears better in every way ie lighter, more powerful and uses less current and as it rotates 180 deg out of the box it doesn’t need to be modified with the hitec servo programmer. However in the UK it isn’t available and I think that from reading other forums there have been some issues with it, so it may have been withdrawn from sale. The 5735 is cheaper but it does need programming so that it rotates 140 degrees rather than 90. Given the choice I would go for the 5995 and accept that it would be a bit of a gamble.


Regards


Chris

From my understanding the 5745 is simply a newer version of the 5735. A couple of minor changes in the case and a more realistic power rating. I have one of each in 2 of my boats that have been running for over a year with the ocasional dunk in salt water and they both still work fine. (bet they don't now I've said that)

A thought on the 5995 which was designed for use in robotics. Power is a finite thing, so how can such a small unit produce so much? The normall way to get more (or the same amount) of power from a smaller motor is to make it spin faster. More speed, more friction, more heat. Look at a formula one car engine, very small, very powerfull, but needs to be replaced more often, I wonder if this will be the case with the 5995?

Nigel28 wrote:A thought on the 5995 which was designed for use in robotics. Power is a finite thing, so how can such a small unit produce so much?

Nigel is right I think. I do not have direct experience of the 5995, but had already got my credit card in my hand to order one, when I heard from people I respect that it has the problem Nigel says -- terrific power, but if you ask it to do this inside an air-tight hull while holding a strain continuously, it simply over-heats and self-destructs. It seems its task cycle must be intermittent rather than continuous, and it needs a cooling flow of free air at all times...

I have been using 5995TGs on 3 boats for over six months now and have been quite happy with their performance and reliability (after discovering a minor issue.) The 5995s replaced 5735s on my boats, at less than half the weight and less current draw (see a previous post from me on this thread.)

The one issue I had with 2 of the 5995s was this: the case screws were overly tight causing some binding which kept the current draw high (I went through batteries like crazy.) The obvious fix was to backout the screws 1/2turn and the servos behaved as expected. The most obvious symptom of this binding is when the servo is lightly loaded and hearing it hum as if it were strugling to with a large load (i.e. close hauled setting with the sheet over the arm - I could hear the servo hum from 30ft away...)

Regards,

Rey
USA 332, 333, 336

Jon Elmaleh also had some very negative experiences with the 5995, in fact he lost two or three in one afternoon. One thing is clear about this servo, if it overheats it melts down and is dead and doesn't come back. I personally, am not comfortable with it particularly in heavy air conditions.

I have not had the kind of negative experience Jon has had with the 5995s. On the contrary, I am quite happy with them, despite the minor early problems.

An alternative to the 5995TG is the 5955TG which has the same specs but a different case with a heat sink. Unlike the 5995TG, the 5955TG does not come pre-programmed for 180deg rotation so you need the Hitec prgrammer to change the rotation angle.

Rey
USA 332, 333, 336