O.S. Max SF .40 - RC Groups
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Oct 29, 2004, 06:50 PM
Registered User

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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Oct 30, 2004, 12:38 AM
Registered User
skid2964's Avatar
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 ...
Last edited by skid2964; Oct 31, 2004 at 12:22 AM.
Oct 30, 2004, 10:21 PM
Registered User
SamD's Avatar
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.
Oct 31, 2004, 09:57 AM
Sloping off....
leccyflyer's Avatar
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
Oct 31, 2004, 02:46 PM
Registered User
Guess I got a pretty good deal @ $45 considering it had never been used.
I have put 6 flights on it this weekend.
Nov 01, 2004, 10:29 AM
the RC guy!!!
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.
Feb 08, 2010, 06:44 PM
Registered User

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
Feb 08, 2010, 08:02 PM
Registered User
Hewey19's Avatar
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.
Feb 08, 2010, 08:26 PM
TEAM BOCA
jeffie8696's Avatar
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.
Feb 08, 2010, 11:32 PM
Got toys?
kenhiraihnl's Avatar
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
Last edited by kenhiraihnl; Feb 09, 2010 at 01:47 PM.
Feb 09, 2010, 02:16 AM
NM2K
Quote:
Originally Posted by yodasands
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
Feb 09, 2010, 10:06 AM
S.A.D. member
ivanc's Avatar
Quote:
Originally Posted by Batdog
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
Aug 01, 2015, 02:50 PM
Fly 3D and keep cool
BenBen123's Avatar
I picked one up for free with 10 flights on it
Aug 01, 2015, 04:20 PM
Registered User
never mind
Aug 02, 2015, 08:26 AM
Methanol, The Cool Fuel !
Gary Cee's Avatar
Quote:
Originally Posted by BenBen123
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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