0S .61 sf, BETTER than FX?
12-01-2003, 07:58 PM
#4
RE: 0S .61 SF better than FX?
Yes, it has ball bearings. It looks a lot like the FX except it doesn't have square head.
There's another little bit older OS 61 FP that is a bushing engine. It looks a lot like the SF.
They are all good engines except the FX is the most powerful.
Enjoy,
Jim
There's another little bit older OS 61 FP that is a bushing engine. It looks a lot like the SF.
They are all good engines except the FX is the most powerful.
Enjoy,
Jim
12-02-2003, 02:34 AM
#5
Senior Member
RE: 0S .61 SF better than FX?
Jim,
All who tested these two engines, said the FX is noticeably quieter.
None said it was more powerful than the SF.
There were SF engines which had a real chromium, ABC piston+sleeve, like the great FSR predecessors.
These were more powerful than the regular, ABN and ringed versions.
All who tested these two engines, said the FX is noticeably quieter.
None said it was more powerful than the SF.
There were SF engines which had a real chromium, ABC piston+sleeve, like the great FSR predecessors.
These were more powerful than the regular, ABN and ringed versions.
12-02-2003, 06:05 AM
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RE: 0S .61 SF better than FX?
There were absoutely NO OS SF's series of any size that were true ABC engines - they were ALL ABN's. OS switched from true ABC to ABN on all their sport engines some time in the middle of the FSR period.
The 61 SF (ABN or Ringed versions) have the same power as the 61 FX (also ABN). The advantage the FX has is that it is much quieter but also a tiny bit heavier. If you check OS Engines.com you will see the RC Report test of the 61 FX where they compare it to the 61 SF.
The 61 SF (ABN or Ringed versions) have the same power as the 61 FX (also ABN). The advantage the FX has is that it is much quieter but also a tiny bit heavier. If you check OS Engines.com you will see the RC Report test of the 61 FX where they compare it to the 61 SF.
12-02-2003, 06:53 AM
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RE: 0S .61 SF better than FX?
read about it here: http://www.osengines.com/reviews/osmg0561-rcr.html
12-02-2003, 01:24 PM
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RE: 0S .61 SF better than FX?
w8ye,
The SF ABC-P is quite a bit more powerful than any FX! Remember the Hanno Spl is just a tweaked rear exhaust version (RF) of the SF.
The SF ABC-P is quite a bit more powerful than any FX! Remember the Hanno Spl is just a tweaked rear exhaust version (RF) of the SF.
12-02-2003, 02:17 PM
#10
RE: 0S .61 SF better than FX?
I was trying to get on here this morning right after Darr but the server would not let me reply.
I've never seen them running on a plane on the same day nor have I run them on the bench at the same time. I don't own either. I've just been around them.
I've been around more SF's than FX's. I really think a lot of the SF's I've been around. They were not mine and I don't know if they were ringed or ABC. I had just assumed they were ringed.
I never seen a FSR fly in a plane to know what it was. I've been around the Hanno's and they didn't run much different than the SF's at the field. But there again, it wasn't the same day.
So I recind my statement from early on about the FX being more powerful.
Jim
I've never seen them running on a plane on the same day nor have I run them on the bench at the same time. I don't own either. I've just been around them.
I've been around more SF's than FX's. I really think a lot of the SF's I've been around. They were not mine and I don't know if they were ringed or ABC. I had just assumed they were ringed.
I never seen a FSR fly in a plane to know what it was. I've been around the Hanno's and they didn't run much different than the SF's at the field. But there again, it wasn't the same day.
So I recind my statement from early on about the FX being more powerful.
Jim
12-02-2003, 03:14 PM
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RE: 0S .61 SF better than FX?
Dar - Yes, some FSR's labeled ABC were actually ABN (later versions) and some were actually true ABC (earlier versions). You won't know until you pop the liner out and then it will become obvious to someone like you who knows something about 2 stroke glow engines.
BTW - Is it true that the square of the hair is equal to the cube of the root or would that be equal to the angle of the dangle plus the heat of the meat?
BTW - Is it true that the square of the hair is equal to the cube of the root or would that be equal to the angle of the dangle plus the heat of the meat?
12-02-2003, 04:14 PM
#12
RE: 0S .61 SF better than FX?
All I can tell you is that I have all three engines (FSR, SF, FX) and the SF is the best IMHO. I just rebuilt one of the SF's after 11 years of hard running and it runs perfect. The FX is a good engine (I removed baffle first thing) but I don't feel it is quite as strong.
12-03-2003, 09:08 AM
#15
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RE: 0S .61 SF better than FX?
Ron,
If you are using the standard silencer, since the SF and the FX are about the same power-wise, you would be better off using a slightly heavier prop.
The Sig Kobra is a fast plane and in flight, you engine is over-speeding. Not from a red-line perspective, but from a maximum power perspective. Your engine probably unloads beyond the RPM, at which it makes its maximum HP.
If you use a slightly larger prop; an 11x8 will give you a slight speed advantage, with similar vertical performance and an 11.5x7 will give you more thrust, without any significant speed loss, which means improved vertical performance.
If you are using the standard silencer, since the SF and the FX are about the same power-wise, you would be better off using a slightly heavier prop.
The Sig Kobra is a fast plane and in flight, you engine is over-speeding. Not from a red-line perspective, but from a maximum power perspective. Your engine probably unloads beyond the RPM, at which it makes its maximum HP.
If you use a slightly larger prop; an 11x8 will give you a slight speed advantage, with similar vertical performance and an 11.5x7 will give you more thrust, without any significant speed loss, which means improved vertical performance.
12-03-2003, 04:45 PM
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RE: 0S .61 SF better than FX?
Sorry I don't have the .60 size, but I would like to get in on the SF/FX discusion. I have quite a few .46SF's and one .46FX. All are very sweet runners, but I like the front needle valve. If I was looking in an engine case today at both, I would surely choose the SF. I think an FX (or the new AX) with a front needle valve would be a great engine...
