Final accurate 5955 torque testing results!

[Extra260]

I decided to start this thread because the other thread might have not had perfect tests and this one was about as close to perfect you will get. These results are totally real world and I believe more raw/true than all the others. It was simply a 5955 with a 1" wheel so the weight was distibuted evenly and the measurments are in ounce inches. This test just used raw weight so there is no chance of a electronic missread or anything like that, just straight up torque. All the tests were performed with a solid 6.14 volts

The first test began with absolute holding torque with a warmed up servo. The absolute max was 20 lbs or 320 oz's. This test was done yesterday with a 1" arm at parrelel so I did not test it again today. This measurment is totally usable.

The second test was performed today with a cold servo to see what the servo can rep at the begining of a flight. The absolute max was 16.5 pounds or 264oz as you can see in the vid I repped it a couple times and If there were may be a 20-30 second brake in the use of the rudder at this force in flight you would consistantly get this value of torque. If you used this force constantly for long periods of time it the power would fade off.

The third test started with the servo at 120 degrees and 14.5 pounds or 232oz's. The servo started off with it easy but lost a little power and then I took 1 pound out to make it 13.5 pounds or 216oz's. After I took that pound out you can see that the servo stayed at the same power and did not get slower or any less powerfull. This confirms that the usable consistant torque of the 5955 is 216oz's. You can bicker with me all that you like but this is the truth. This is raw wieght with nothing but a servo heated up to what it would be in the air and 6volts. There are no variables in this test that can have an affect on the results and that is why I feel I did a good job. The long video I took is your evidence. The servos were given short may be 5 second brakes of the load in neatral a few times in the test


So usable torque for 5955 is 216 ounce inches. With holding torque of 320oz's

YouTube - Final 5955 test

YouTube - Final 5955 torque

[Flatlandman]

Very good info here.

Thanx for the numbers wish you had some more servos to test. Do you know any one local who has a 8611 and a 8711 you could test.

[Extra260]

Unfortunatly not but if someone wants to send me one I would... lol. I dont think I really would bother testing the 8611 because they probably arent that more powerfull and there gears would restrict me from them anyways. But the 8711 I would because they seem to be holding up ok.

[sprice50]

Try the same test with a 8711... anyone? I'd love the same comparison, but I do prefer the 5955 titanium gear train.

[Flatlandman]

The reason i would like to see you do the 8611 as well as the 8711 is that the 8611 is same class servo as the 5955. The 8711 is in a higher class by its self and compareing the 8711 to the 5955 isnt fare.

[Extra260]

Your right, so I think that the 5955 is the best in its class by far with that said!!!

[Zee]

Mike, good job on the testing. You sure do better than some of the big mouth types on the another thread, you did it while they still talk about it.
Zee

[jonkoppisch]

It's simple to see how tests can be skewed... Look at the picture that troybuilt used to test the servo. 1, it was a longer arm and 2, the linkage was set correctly..



Ways tested:

TBM conducted its own servo torque testing using the pictured equipment. We monitored the voltage at the Rx, the voltage at the battery, the amp draw at the battery, and the torque of the servo. We used a TBM 2-cell LiIon battery with a MPI Miracle switch (which has a built in 6v regulator).

Results:

We found that the first 1/10 of a second that the servo is used that the torque is at its maximum. The performance then degraded substantially over the next 60 seconds (of intermittent use), and stayed at that lower value for the duration of the testing. For instance the JR-8711 has an initial torque of 358 oz-in, and after 60 seconds (of intermittent use) the case heats up to 120 deg F and the torque drops off to only 280 oz-in! This is a decrease of over 20%. I regret to report that the Hitec HS-5955 lost 40% of its torque by dropping from 248 oz-in to just 152 oz-in in about 60 seconds (of intermittent use). To define intermittent use: I did not simply stall the servo for 60 seconds to see what would happen. I operated the servo as if I was performing knife edge passes along the flightline and knife edge loops, so the servo was cycled on an off and was stalled for no more than 8 seconds at a time.

This is a real world test done by experienced people who actually sell the servo. If anything, they hurt themselves by loosing sales from this...

JR-8711 vs Hitec HS-5955 in actual use. This test started with using one HS-5955 servo in my 35% Extra 260. I had just enough rudder power to perform a knife edge loop. However I noticed that the rudder lost power later on in the flight. Apparently this was due to the servo heating up and losing power. I added a second HS-5955 servo and the difference was tremendous. Rudder authority was like a foamy plane. I then switched to one JR-8711, and there was no detectable change to the rudder authority compared to the two Hitec HS-5955 servos. This confirms that the above test results of 152 oz-in vs 280 oz in is realistic and usable

[buttface]

Keep werking them 5955s son!!!! They will get stronger!!...................and bigger.........(hickup)

[buttface]

	Quote: Originally Posted by Flatlandman
	The reason i would like to see you do the 8611 as well as the 8711 is that the 8611 is same class servo as the 5955. The 8711 is in a higher class by its self and compareing the 8711 to the 5955 isnt fare.

Thank you !!!This man sees the light!!!!Finaly I have conviced someone!!!!!

[hpapilot]

Aww maaaan. Why don't we all just leave the poor lil' 5955's alone! What'd they ever do to you...

Alright. New idea. Why doesnt someone mount a 5955 and an 8611 in a rudder servo tray with identical arms and a linkage between the two, reverse them from eachother, plug them in and move the stick. See which one gets its way and which gets dragged along. The servo tractor-pull of the century...

And agreed. Comparing a 5955 and an 8711 is pointless. No doubt which will win that... the one pulling nearly triple the amps of the other.

(Rant over.)

[jonkoppisch]

I blew up the jpeg of the 8711 on the test stand and measured the arm. It looks to be a 1 1/4 inch arm that they were using. I guarantee that you can go to an event and a majority of pilots will be using at least a 1 1/4 arm on their servos!!! This should be where the servo is measured (less produces more torque but doesn't count as that isn't real world #'s) or larger as this produces lower #'s which most modelers don't use.... The smaller the arm, the higher the torque.. Larger/lower

[hpapilot]

Another question. As I recall brushed motors do have a break-in period. Has anyone tested well-used servos for torque? Just a thought.

RJ

[buttface]

	Quote: Originally Posted by hpapilot
	Aww maaaan. Why don't we all just leave the poor lil' 5955's alone! What'd they ever do to you... Alright. New idea. Why doesnt someone mount a 5955 and an 8611 in a rudder servo tray with identical arms and a linkage between the two, reverse them from eachother, plug them in and move the stick. See which one gets its way and which gets dragged along. The servo tractor-pull of the century... And agreed. Comparing a 5955 and an 8711 is pointless. No doubt which will win that... the one pulling nearly triple the amps of the other. (Rant over.)

Yea ,the 8711 will win the arm restle!The 5955s will be smokin' in a bad way!I would love to see that and would pay to see it!!!
Servo armrestling could be the new olimic sport!

I bet (1) 8711 could beat (2) 5955s in a servo arm restle with one arm tied behind its back!!!!

[hpapilot]

	Quote: Originally Posted by buttface
	Yea ,the 8711 will win the arm restle!The 5955s will be smokin' in a bad way!I would love to see that and would pay to see it!!! Servo armrestling could be the new olimic sport!

Notice, I said 8611, not 8711. You yourself said there is no comparison between an 8711 and a 5955.