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Old Oct 29, 2004, 05:50 PM
yodasands is offline
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O.S. Max SF .40

I picked one of these up the other day. Does anyone else use them. Any opinions. I cant find much info on the net.

Thanks,
Dan
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Old Oct 29, 2004, 11:38 PM
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I have a 40FP that I have only run for break-in ... runs very smooth. I also had a 15 FP on a Dynaflite Butterfly ... That was fine running engine!

EDIT: wooops, you did say SF, I somehow read FP ... disregard above ...
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Old Oct 30, 2004, 09:21 PM
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SF is an older ball bearing engine; sturdy & reliable. Not sure the power quite compares to the new FX line of engines but certainly much better than the current OS line of sleeve bearing engines- that miserable excuse for an engine: The LA series (if you buy two, you can use 'em for book ends). I have a few SF engines and they're all good performers.
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Old Oct 31, 2004, 08:57 AM
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Sloping off....
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Superb engine, one of the best I've ever had (the other best one being an OS .25 SF), very easy to operate, pretty powerful for it's size and now quite sought after as being more bullet proof and with better longevity than it's replacement the FX series.

You picked up a good one.

Brian
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Old Oct 31, 2004, 01:46 PM
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Guess I got a pretty good deal @ $45 considering it had never been used.
I have put 6 flights on it this weekend.
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Old Nov 01, 2004, 09:29 AM
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the RC guy!!!
india
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hey yoda,

well just wanted to give you some information about the SF series engines!!! these are the dual ball bearing, long stroke engines, often adjudged better than even the FX series of OS!!!! they had probably the best metallurgy on these engines!!! and they are long lasting, and had some variants like the ringed and the non-ringed ones too!!! i am using about 5 of these engines even today, in india - all SF's and they are doing good work!!! you have really got a deal for USD 45 if you got that!!!

well happy landings and enjoy ur SF engine!!!

sam.
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Old Feb 08, 2010, 05:44 PM
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os max fx40

What is the best fuel fo this 10 or 15% , name brand? any other info would be helpful. can I get a manual on this some place ? Thanks for any help
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Old Feb 08, 2010, 07:02 PM
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I have an OS 46 SF and I have been very happy with it. Parts are kind of getting hard to find for them so be good to it.
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Old Feb 08, 2010, 07:26 PM
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I use 15% Sig Champion because mine has been used so much the compression is low, but it still runs great!!
I understand it ingested some prop blast driven dust while running one day at the local airfield, the original owner was very displeased.
One of my favorite engines and no slouch on power.
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Old Feb 08, 2010, 10:32 PM
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i have 3 os.46sf engines...all have been modified with dave shadel's abc piston/sleeves...i've observed other flyers w/ os.40sf engines, and imho, they were a notch better overall...i think the thicker cylinder wall did the trick...you have a great engine...w/ sus bearings and added castor, the engine will outlive you...
...oops...just noticed that this thread is about 6 years old!!!...OP last posted about 4 years ago...probably moved on to another hobby, LOL...ken
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Old Feb 09, 2010, 01:16 AM
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Quote:
Originally Posted by yodasands View Post
I picked one of these up the other day. Does anyone else use them. Any opinions. I cant find much info on the net.

Thanks,
Dan

The reason that you don't hear much about them is because they are such reliable engines that throttle great and that produce good power, even to this day. Folks are busy flying them and not complaining about them on the internet. <G>

I love my OS .46SF and .61SF's.


Ed Cregger
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Old Feb 09, 2010, 09:06 AM
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Quote:
Originally Posted by Batdog View Post
What is the best fuel fo this 10 or 15% , name brand? any other info would be helpful. can I get a manual on this some place ? Thanks for any help
The BEST? I don't know but for a 40FX I'd use the same fuel I use for my other engines - Omega 15% or CoolPower 15%.

Ivan
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Old Aug 01, 2015, 01:50 PM
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I picked one up for free with 10 flights on it
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Old Aug 01, 2015, 03:20 PM
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never mind
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Old Yesterday, 07:26 AM
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Wearing out rare engines
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Quote:
Originally Posted by BenBen123 View Post
I picked one up for free with 10 flights on it
You did real well . That is a fine engine . Treat it with care and it will give you many years of service .

It would be a fine engine in any 40 sized plane .
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