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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › OS55HZ here :). Woot!!!
09-19-2009 02:39 PM  11 years ago
DWS6

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Newark,DE

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I agree coronaL,

I have had excellent service in the past with OS however I have witnessed many fellow pilots get a warranty denial based on what seems like invalid reasoning. Another hyper was just sent in with receipt and no bearing rust. It will be interesting to see what the results are as there seems to be a trend of invalid denials.

I can tell you that it will only take them screwing me over once before I go to a different brand motor. Currently, I am OS all the way but I stand behind what I fly and will not promote poor customer service so I sure hope they follow through in the future.

There are certainly many cercumstances where warranty denial is justified but there has been a known quality issue with Hyper 50 bearings and they cause a lot of motor distruction on failure. It takes a trained ear to catch the failure early enough to save the internals.

I suspect that the economy is putting it's fare share of a financial burden to OS/Hobby services but the last place they should try to make back some margin is in the warranty denial process IF that is what is going on here.
Dave Williams
Team Align
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09-19-2009 07:23 PM  11 years ago
robhurlin

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Pretoria, South Africa

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SO,

How does the OS55HZ perform?????????????
Rob.
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09-19-2009 11:54 PM  11 years ago
montarok

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Brooklyn, NY

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that OS/Hobby Services wasn't having issues with the SZ pumps, and that it was "RARE" for them to see them as they were a reliable design
Don't be shocked at all. This seems to be a prepared line, except that in my case, the "SZ pumps" was replaced with the "50 hyper bearings".
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www.carifuna.com
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09-19-2009 11:56 PM  11 years ago
montarok

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Brooklyn, NY

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...but there has been a known quality issue with Hyper 50 bearings and they cause a lot of motor destruction on failure...
OS/Hobby services absolutely disagrees with the rest of us on this.
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www.carifuna.com
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09-20-2009 12:03 AM  11 years ago
trevortraffic

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southeast Florida

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new OS55 rear bearing
Now that the 55 is out, has anyone checked their new engine's parts list to see if it has the same rear bearing as the 50?
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09-20-2009 03:18 AM  11 years ago
Double Springs

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Cookeville, TN

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Now that the 55 is out, has anyone checked their new engine's parts list to see if it has the same rear bearing as the 50?
It is the same size bearing, but a higher quality NTN (edit - SKF) one. The extra webbing on the case is supposed to help support the bearings better, we will see I guess....
Do or Do Not, There is No Try
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09-20-2009 06:32 AM  11 years ago
Gearhead

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Vt

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well actually the photos I saw of the 55 had a SKF rear bearing, same size as the 50 I believe, and to add the crank was lighten a bit on the Pin sideJim
Buzz Buzz Buzz
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09-20-2009 02:27 PM  11 years ago
Double Springs

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Cookeville, TN

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My bad, it is an SKF, I've got NTN stuck in my head for some reason. It is a 61902 here:

http://www1.mscdirect.com/CGI/NNSRI...PMT4NO=70945145
Do or Do Not, There is No Try
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09-20-2009 03:21 PM  11 years ago
DWS6

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Newark,DE

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I also noticed that the webbing on the crank was removed around the counterbalance. This should help to get more oil to the rear bearing.Dave Williams
Team Align
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09-20-2009 04:20 PM  11 years ago
CoronaL

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Winnebago IL

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plus I think when OS re-balanced the HZ, they probably did something similar with the 55HZ so I think that should help with bearing life too.

Personally I think corrossion played only one part, sometimes smaller part than the balance of the motor, fuel used, and rpm of the motor.

My theory is that when this motor has a better dynamic balance than the old hyper, the bearings should last longer anyway.
Randy!!! I am the liquor
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09-20-2009 06:55 PM  11 years ago
J Kofoed

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Denmark

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How many compression rings is under the cylinder head?Best Regards Jesper Kofoed
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09-20-2009 08:13 PM  11 years ago
DWS6

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Newark,DE

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your probably on to something there CoronaL however my .91HZ needs a new rear bearing after 83 flights. Just tore it down to find the inner race moving side to side inside the outer race. If you spin it fast you can hear the balls rattling. Guess the balance still isnt close enough. LOL!

Both HZ cranks are designed the same as far as the webbing goes.
Dave Williams
Team Align
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09-20-2009 08:39 PM  11 years ago
trevortraffic

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southeast Florida

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The SKF bearing in Double P's link contains 12 balls vs. 10 for the Hyper.
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09-20-2009 11:52 PM  11 years ago
CoronaL

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Winnebago IL

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got my first few flights in today on the new OS55hz

Decided to do a slower approach to break in similar to what I do with my 91's.

First few tanks were no significant load on the motor. FF etc.. Of note, factor needle settings were way rich, and really wouldn't run well so I needed to lean it to about 1.75 turns on the high and about 1.25 turn on the mid before it would run clean enough to fly. Each flight I'd go in about 1-2 clicks so by tank 5 I was at about 1.25 +3 clicks on the high. Tank 5 it started to smooth out a bit. Sounded better and smoother as well. Leaned 2 more clicks so I'm about 1.25 on the high, and I was about 1 turn give or take on the mid. I tried 3/4 on the mid, but I would get a slight cackle during some transitions so went back to 1 turn or so. Tanks 5-8 I was doing FF with some loops/rolls etc.... No tic tocs yet.

By tanks 7-8 the motor really seemed to smooth out and feel like it was starting to get "there" as far as seating and getting a bit looser. I put a 9th tank on it and by then it was even better. I think I went another click or so in on the main/high needle. Motor really seems pretty good. I tried a couple tic tocs and power seemed good, but I dind't want to load it down much so I didn't do sustained tic tocs, but I'm happy with how things are going.

This is on an Align pipe btw which seems to be a pretty decent combo. I'm sure I'm leaving some power on the table vs a Hatori 566, but Bert K said the Align would work well so since I had a couple on hand I wanted to try this before my Hatori comes in from Japan.

I'm also running a mix of 1 gallon of 30% CY Wildcat mixed with 1 gallon of 15% Wildcat 2/4 cycle fuel which gives me a 22.5% nitro blend with about 20% oil content. I actually prefer this to the straight 30% CY wildcat as it runs a bit cooler and I can't tell a noticable power difference. The OS55 seems to like it just fine

If the weather holds out for tomorrow I'll head out after I work in the AM, and hopefully put about 5-6 more tanks through it before I really start to flog it . I'm pretty close to my final tune, so not alot of power left in tuning, but the past 3 tanks the motor really seemed to be coming on just from being run in I think .
Randy!!! I am the liquor
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09-23-2009 09:34 PM  11 years ago
72CHVY

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Dallas, Texas-USA

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Thanks for the tips CoronaL, I put my 55HZ in monday and ran one tank through it yesterday with the manual settings, it never got over 115 degrees on the head running 30% wildcat and having the Align pipe on a Trex SuperPro. I couldn't resist "Popping" it a few times in normal and I can tell it has more power already, I'm totally pumped up for this weekend, thanks for the setup tuning tips!
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09-23-2009 09:38 PM  11 years ago
CoronaL

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Winnebago IL

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lol it's so hard to resist isn't it
have fun with it. Can't wait to fly mine again.

Hopefully the "whether" here will improve. Wheter I give a rats a$$ if my wife gets pissy about me flying that is.
Randy!!! I am the liquor
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09-23-2009 11:12 PM  11 years ago
72CHVY

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Dallas, Texas-USA

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Have you seen the O.S. pipe that is supposed to be for this motor?
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09-25-2009 03:26 PM  11 years ago
newflyer2008

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edgefield

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I ordered mine today. Plan on putting it in my Vibe 50. Anyone runnning one in a Vibe?JR VIBE 50,Futaba,Radix
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09-25-2009 05:43 PM  11 years ago
envoy2004

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Endicott, New York 13760

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Does anyone have any left in stock?
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09-25-2009 06:23 PM  11 years ago
newflyer2008

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edgefield

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Your best is on ebay. Theres a guy thats has a few left on there. They are not in the US yet. Heliproz has the hatori 55 in stock so thats where i got my pipe from.JR VIBE 50,Futaba,Radix
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › OS55HZ here :). Woot!!!
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