Another wasted evening with the OS 91FX  
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    • All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Another wasted evening with the OS 91FX
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    Another wasted evening with the OS 91FX - 7/29/2003 12:19:04 PM   
    rajul



    Posts: 6379
    Joined: 6/18/2002
    From: Missouri City, TX, USA
    Status: offline     		Some distributors have "quietly" removed the 0S91FX from their price list.

    _____________________________

    Mike Marks
    RCU Moderator
    Aerofly Support Representative http://www.aerofly.com/index.html

    (in reply to FLYBOY)
           Post #: 51

    Another wasted evening with the OS 91FX - 7/29/2003 12:52:02 PM   
    nashtm



    Posts: 290
    Joined: 11/13/2002
    From: Port Elizabeth, SOUTH AFRICA
    Status: offline     		Well after fixing my bubble problem by using a perry remote
    nv I am contemplating purchasing a second 91fx !!

    Tim

    (in reply to FLYBOY)
           Post #: 52

    OS .91FX - 7/29/2003 3:25:51 PM   
    DarZeelon



    Posts: 7233
    Joined: 4/9/2003
    From: Rosh-Ha'Ayin, ISRAEL
    Status: offline     		Why is everybody trying to solve all these problems, that OS failed to?

    There are MANY .91 engines out there, that are much stronger, cheaper, lighter and some even better looking than OS.

    From all the posts in this thread and in numerous others, I would say this falls into the "Lemon car" law catagory, doesn't it?

    _____________________________

    Dar Zeelon - ISRAEL - ddzeelon@gmail.com
    MVVS - Jett - Nelson - Bolly - Mejzlik

    (in reply to FLYBOY)
           Post #: 53

    Another wasted evening with the OS 91FX - 7/29/2003 5:26:34 PM   
    Sprink



    Posts: 2236
    Joined: 4/23/2003
    From: London, UNITED KINGDOM
    Status: offline     		Unfortunately it is a lemon. But OS have a big reputation, and they are living on that. Problem is it is borrowed time. I have not bought another OS since the 91, which was over three years ago now.

    The other manufacturers are all improving and relaunching thier products and other new manufacturers are coming in, while OS don't seem to be doing very much at all (slight revision to the 46FX and the newish 50SX is all I can think of over the last few years).

    They built their reputation by mass producing strong reliable and powerful engines, but they are not the only ones to do that now.

    Even just a couple of years ago at my club if you turned up with a new engine that wasn't an OS, they looked at you funny. (and if it wasn't an Irvine either, they would run a mile). Now the only new OS we tend to get are LA 46s on the Trainers of new members. Instead I have seen MVVS, ASP, ST, TT, Laser, YS, Saito, West Eurotech (Webra), MDS...

    Our club air section secretary has a new OS 91, I noticed on Sunday. I think I should mention the problems, so he can send it back before running it, and get something more reliable.

    _____________________________

    "If it doesn't break, it is probably too heavy"

    (in reply to FLYBOY)
           Post #: 54

    The fact of the matter is.... - 7/29/2003 6:41:48 PM   
    Flyboy Dave



    Posts: 13511
    Joined: 3/20/2002
    From: San Bernardino County, CA, USA
    Status: offline     		....it's not that bad of a motor, just not really powerful.
    Things that exasperate the problems (aside from the
    cheap needle valve) are sometimes operator induced.

    I'm not saying that some guys don't know how to run
    'em....but listen.... : ....

    In the first place, the FX is NOT a big powerful motor.
    You guys are way over-propping them, adding to the
    overheating problems. Put a 13-6 on it, and let it turn.
    Secondly, the big ABC engines need to run a little richer
    than a ringed motor, they run hotter.

    The fuel....(here we go : )....I just saw a guy
    wipe out a new Magnum .91 XLS with three runs, with a
    cowled motor, on synthetic only oil. Shot....no compression.
    The big ringless motors need castor oil to survive, plain
    and simple. Use some 15% Powermaster, and dump 4 oz
    more castor in it....the motor wont fry....

    Cowlings, and Pitts mufflers are nice....but they add to
    the overheating problems.

    Given a chance the Fx is ok, just not a powerhouse. With
    the right prop, fuel, lubrication, cooling, tuning, and some
    proper break-in....they will run fine, and not overheat.

    Dave.

    _____________________________

    An engineer says.... "That won''t work".
    A mechanic says..."Oh yeah, watch this".
    "Old Age, and Treachery will overcome youth and skill".
    Revver Bro #4.

    (in reply to FLYBOY)
           Post #: 55

    Another wasted evening with the OS 91FX - 7/29/2003 6:55:24 PM   
    Sprink



    Posts: 2236
    Joined: 4/23/2003
    From: London, UNITED KINGDOM
    Status: offline     		The 91 FX is ringed, not ringless. Believe it is ABN aswell rather than ABC (not sure on that).

    I am aware that I over prop with an APC 15x7, but it is the lowest loading prop that I can use and pass my club's sound limit. The engine seems perfectly happy with this prop.

    Since sorting out the needle valve, I have only ever had one deadstick in over two years flying. It is cowled, but the head is outside the cowl, and there is plenty of open space at the back to let out the hot air.

    _____________________________

    "If it doesn't break, it is probably too heavy"

    (in reply to FLYBOY)
           Post #: 56

    Another wasted evening with the OS 91FX - 7/29/2003 7:02:30 PM   
    Dave03B


     

    Posts: 2207
    Joined: 6/5/2003
    From: Bournemouth, UNITED KINGDOM
    Status: offline     		So, give me an run down of what to use with the OS91 for smooth operation. I was hoping to use a Box (dustbin) silencer, is this OK.

    Please give me some tips for what to do to get this engine running reliably!

    (in reply to FLYBOY)
           Post #: 57

    Another wasted evening with the OS 91FX - 7/29/2003 8:42:41 PM  1 votes
    FLYBOY



    Posts: 8692
    Joined: 1/7/2002
    From: Missoula, MT, USA
    Status: offline     		[QUOTE]Originally posted by Dave03B
    I have been looking at the MVVS 91! any thoughts Flyboy? [/QUOTE]

    Thats what I plan to try if this needle doesn't work. Maybe tonight I can get the time to try it. Shouldn't take long to install, just never home. Too much going on in the summer. Better than not enough I guess.

    MVVS looks like a nice engine.

    _____________________________

    Fly it till the wings come off.

    (in reply to FLYBOY)
           Post #: 58

    Another wasted evening with the OS 91FX - 7/29/2003 8:47:18 PM   
    maxtenet



    Posts: 708
    Joined: 10/18/2002
    From: Towson, MD, USA
    Status: offline     		Getting an O.S. .91 to run well is like getting a Yugo to run as reliably and powerful as a Porsche. A waste of time is right! Spread the word! The emperor (O.S.) has no clothes. MVVS is King!

    Max

    (in reply to FLYBOY)
           Post #: 59

    Another wasted evening with the OS 91FX - 7/30/2003 8:33:49 AM  1 votes
    FLYBOY



    Posts: 8692
    Joined: 1/7/2002
    From: Missoula, MT, USA
    Status: offline     		Well, I put in the new needle, it has more authority to control the mixture, but the engine still quits dead from full throttle. I am going to try one more thing next time I take it to the lake, and if that doesn't work, I might just throw it in! Just kidding. I will sell it and the second new in the box one though and order something else. I am really tired of dealing with it. I don't get much play time. Don't need this! I defianately will not let anyone I know buy another OS though. That is just bunk! There are too many good engines out there to deal with this. I still haven't gotten a reply from the OS rep at hobbico, and was even given his personal address to write to. Never had service that bad from them. I told Krysta if he worked for me, he wouldn't work for me.

    _____________________________

    Fly it till the wings come off.

    (in reply to FLYBOY)
           Post #: 60

    Another wasted evening with the OS 91FX - 7/30/2003 5:47:12 PM   
    Crash90



    Posts: 2315
    Joined: 10/5/2002
    From: Cressona, PA, USA
    Status: offline     		Every engine I have ever owned with exception of 1 has been OS. I have been a faithful customer to them and never had a problem. However, I have read too many stories just like this one concerning the 91fx. It is obvious that os plans on doing NOTHING. That being said I have decided not to purchase any more OS engines. I can get better value elsewhare. If there is a boycott i'm in. There are too mant other options out there. TT,super tiger,irvine,mvvs. Bye OS.

    Maybe someone should post this in the direct support forum.

    (in reply to FLYBOY)
           Post #: 61

    Another wasted evening with the OS 91FX - 7/30/2003 7:04:50 PM  1 votes
    FLYBOY



    Posts: 8692
    Joined: 1/7/2002
    From: Missoula, MT, USA
    Status: offline     		Kind of a bummer, I too have used them for over 27 years. Most of my engines are OS. I know our club may not be the biggest, but after this fiasco, everyone in the club has seen the results and noone wants to mess with OS. Its a shame, I used to take them out of the box, install them, and fly them. Never had a problem. I always told people they came broke in (figure of speech). My 46 FX decided to do it last time on an inverted pass at less than 4 feet. Luckily, I was quick on the stick and got it flipped and on the gear. The 46 is a bit better, but now I am not trusting it as much either.

    _____________________________

    Fly it till the wings come off.

    (in reply to FLYBOY)
           Post #: 62

    Another wasted evening with the OS 91FX - 7/30/2003 7:21:25 PM   
    Dave03B


     

    Posts: 2207
    Joined: 6/5/2003
    From: Bournemouth, UNITED KINGDOM
    Status: offline     		Oh great everyone's loosing faith in OS engines just as I prepare to get an 91fx

    (in reply to FLYBOY)
           Post #: 63

    Another wasted evening with the OS 91FX - 7/30/2003 7:25:27 PM  1 votes
    FLYBOY



    Posts: 8692
    Joined: 1/7/2002
    From: Missoula, MT, USA
    Status: offline     		[QUOTE]Originally posted by Dave03B
    Oh great everyone's loosing faith in OS engines just as I prepare to get an 91fx [/QUOTE]

    Man, save yourself a lot of headaches. Get something else. Super tigre, MVVS, thunder tiger.

    I have a NIB OS I will sell you, or one with little run time.

    _____________________________

    Fly it till the wings come off.

    (in reply to FLYBOY)
           Post #: 64

    Another wasted evening with the OS 91FX - 7/30/2003 7:37:51 PM   
    Dave03B


     

    Posts: 2207
    Joined: 6/5/2003
    From: Bournemouth, UNITED KINGDOM
    Status: offline     		I have a friend who Is getting me one for £40.
    Him and his club mates say they are still the best!

    (in reply to FLYBOY)
           Post #: 65

    Another wasted evening with the OS 91FX - 7/30/2003 7:38:23 PM   
    rajul



    Posts: 6379
    Joined: 6/18/2002
    From: Missouri City, TX, USA
    Status: offline     		I have an OS46FX and OS61FX, both of which have given me flawless performance. I have a 50SX on the way. I'll buy another OS anytime. Just because one engine in their range may have an issue doesn't automatically put the others in the same basket. I have a buddy who has been running the 91FX without any problems.

    _____________________________

    Mike Marks
    RCU Moderator
    Aerofly Support Representative http://www.aerofly.com/index.html

    (in reply to FLYBOY)
           Post #: 66

    Another wasted evening with the OS 91FX - 7/30/2003 8:39:49 PM