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Other › Spektrum S75 Servos Problems & Questions
02-09-2006 02:49 PM  12 years agoPost 1
axis

rrApprentice

Lone Star State, USA

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I bought my new Spektrum DX6 radio a few weeks back and couldn't be happier with the Spektrum Rx and Tx. However, the servo's, well in a word, they suck... The servo's were fine, of course, when they were new but they have slopped out something severe in the last few flights. They are so bad right now that my T-Rex is unflyable.
I can grab the servo horn and rotate it about 1/16th or so before the gears start to turn. The initial movement is just taking up the slop inside the case. It was extremely hard to keep the heli in a solid hover and all my inputs seemed very dampened. The heli also started this odd wobble in the air. I am hoping the wobble can be attributed to slop in the linkage due to the servo's.. So I landed to take a look see and thats what I found. I noticed the problem first about a week ago on the tail servo and switched to a HS-56 and my tail has now been rock solid.
If I am not mistaken these are re-badged servo's identical to the ones that come with the Blade CP.
Anyways, I called Horizon and of course they said send them in to be evaluated and it may be 10-14 days before I even hear something back he said. This really sucks to have such an awesome radio & receiver only to have servo's of this quality.

Has anybody else had this problem with these servo's?
Would that amount of slop in the linkage cause an odd wobble when flying?

I have seen this sort of wobble before with my Blade CP but it was because I had too much pitch and not enough power. I lowered the pitch, brought up the head speed and the wobble went away. No matter what I did with my TRex the wobble remained. As I raised the head speed the wobble got a little better, but never went away.

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02-09-2006 03:20 PM  12 years agoPost 2
TheLost

rrNovice

Utah

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I use S75's in a few of my planes and they work great... But i would never trust them in a Heli (well, ok.. they are working fine in my Blade CP).

s75's have been reported to get sloppy on the TRex. Do a search here on RR and you'll find a few bad reports. Your best bet is to pick up some HS-56HB's.

~Brian

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02-09-2006 03:22 PM  12 years agoPost 3
hoverking

rrKey Veteran

Tennessee

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we installed some in a trex yesterday and could never get a center to be consistant, going to take them out and install hs56mg

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02-09-2006 03:45 PM  12 years agoPost 4
axis

rrApprentice

Lone Star State, USA

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Would excessive slop in the servo heads (all 3) cause the heli to wobble in flight? It seems to get worse everytime I fly it. I have checked everything and everything else is correct. My radio settings are back to the way they were previous to me trying to find a solution.

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02-09-2006 05:15 PM  12 years agoPost 5
lbowen

rrApprentice

York S. Carolina-USA

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Absolutely the inability of the servo to center will cause just the wobble you are experiencing and the servo will probably stall any time and lead to disasterous results - get rid of them IMO. Good you got some use out of them if you did not have an aircraft to have used them in - so put a reasonable servo in while your investment is in one piece.

lbowen

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02-09-2006 05:39 PM  12 years agoPost 6
axis

rrApprentice

Lone Star State, USA

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Thanks lbowen I plan on it. I guess that does make sense about the wobble. I just wanted to make sure my heli didnt have any issues..

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02-09-2006 05:53 PM  12 years agoPost 7
lbowen

rrApprentice

York S. Carolina-USA

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You are welcome and by the way I have A DX6 with about 4 hours on it now and all HS56 servos (Heliup CF frame ) I have rock solid hover and flight - but I have had wobble from a head that was to loose and blade holders that were not holding pitch but servos were my original wobble cause and tail wag as you experienced and solved. I love the glitch free flying with the DX6 . My son's TRex uses an Optic 6 that never experiences a glitch (stock plastic frame CC35). My Optic 6 and CF frames (various that I have had) was glitching even with ferrite rings and chokes on the CC35!

lbowen

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02-09-2006 06:02 PM  12 years agoPost 8
TheLost

rrNovice

Utah

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I'll buy the S75's from ya ..

PM me if you want to get rid of them.

~Brian

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02-09-2006 06:47 PM  12 years agoPost 9
axis

rrApprentice

Lone Star State, USA

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PM sent..

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02-09-2006 06:55 PM  12 years agoPost 10
Rob_T

rrElite Veteran

..

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I had the same experience with S75s from my DX6 in a CDE. One test flight was enough to convince me to switch out to HS56s. They're just not precise enough for this application.

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02-10-2006 03:28 PM  12 years agoPost 11
drdot

rrElite Veteran

So. California, Orange County.

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fwiw..

I've got two sets,
Both work at least as well as HS 55s...Still waiting for the true digital micros we need to bring these things to life...

JOhn.

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02-11-2006 02:54 PM  12 years agoPost 12
axis

rrApprentice

Lone Star State, USA

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Well I went and bought 3 HS56's to compliment the existing HS56 in the tail and WOW what a difference. Hover is rock solid now, the controls are crisp and precise. I need to get accustomed to the heli again. I put the S75's in it when I got it and this is the first servo change since and I must say its a whole different machine now. Also no more wobbling and ALL of my linkage is loose yet slop free..

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02-11-2006 10:39 PM  12 years agoPost 13
whtbronco

rrApprentice

Winchester, Virginia USA

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True digital micros huh??? How about the JR DS281's. That's what I have for Rex.

Chris Wish I was flying!

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02-11-2006 11:23 PM  12 years agoPost 14
Gary Hoorn

rrKey Veteran

Annapolis Maryland USA

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Have you flown with those JR281 servos? They are very slow according to the specs. (.23-60 degrees)
Gary

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