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OS 75Ax or OS90Fx

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OS 75Ax or OS90Fx

Old 09-13-2007, 06:20 AM
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Default OS 75Ax or OS90Fx

I was thinking of buying the new OS75 Ax but looking at the specs. I see that the OS91Fx is a bit lighter, more powerful and nearly the same price. What advantages would I have getting the 75AX?
Old 09-13-2007, 11:29 AM
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Default RE: OS 75Ax or OS90Fx

None, absolutely NONE! That's a no-brainer. The 90 is built on the same size crankcase as the 75, is lighter, and will outgun the 75 in every respect.

Dr.1
Old 09-13-2007, 08:50 PM
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Default RE: OS 75Ax or OS90Fx

Go for the super tiger G90, you will get much more bang for your buck. Also what kind of plane do you plan on putting this engine in.

Now if only we could convince super tiger that they need to make a .55 to compete with the new O.S. .55AX
Old 09-14-2007, 02:49 AM
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Default RE: OS 75Ax or OS90Fx

I want the engine for a UcanDo 60. The plane would probably fly better with a 4 stroke but I don't want to worry with tuning and prefer to spend less also.
Isn't the Super Tiger more difficult to tune than a OS?
Old 09-14-2007, 06:33 AM
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Default RE: OS 75Ax or OS90Fx

Supertiger does have a bad rap for being dependable on the carb settings. Alot of flyers have installed different carbs on them and they are good engines then. I have to agree, go with the 91. Good Luck, Dave
Old 09-14-2007, 10:28 AM
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Default RE: OS 75Ax or OS90Fx

91FX no question. That engine/plane combo should be a lot of fun for you.
Old 09-30-2007, 12:01 AM
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Default RE: OS 75Ax or OS90Fx

I fly a supertigre 45 on my 46 size u can do swinging a 12x4 prop never had any real issues with carb

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