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New OS .70 Four Stroke?

Old 11-03-2006, 06:31 AM
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bps
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Default New OS .70 Four Stroke?

I am looking for a candy drop plane (Sig Senior Kadet with Many mods) I am building. OS has a lower priced and lighter .70 4 stroke the O.S. 70FL. Any one have experience or knowlege of this power plant? I was just about ready to order the Magnum 4 stroke when I saw this. Any information would be appreciated.
JEB
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Old 11-03-2006, 07:00 AM
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w8ye
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Default RE: New OS .70 Four Stroke?

The Magnum 70 will be a lot more engine than a OS FL70.
Old 11-03-2006, 09:16 AM
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wcmorrison
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Default RE: New OS .70 Four Stroke?

Many curse the OS 70FL, lower priced, lower performance, etc. I, too, recommend the Magnum 70 over the OS-FL any day. On the other hand, the OS Surpass 70 is a very good engine but cost a lot more than the umbiquitos FL.

Go with the Magnum and you will never regret it.

Cheers,

Chip
Old 11-03-2006, 09:23 AM
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doubledee
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Default RE: New OS .70 Four Stroke?

JEB,
I'm glad to see that I am not the only one who spoils their dog. Dick Hanson, take note.

Regards,
doubledee
Old 11-03-2006, 08:01 PM
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Default RE: New OS .70 Four Stroke?

Read the cust reviews on the FL 70. I think you will opt for the Magnum or the Surpass
Old 11-03-2006, 08:15 PM
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Default RE: New OS .70 Four Stroke?

Thanks for the feedback. Magnum it is! As for the dog, quality control manager and he is letting me know it is time to relax! And doubledee I believe that the dog has spoiled us, he rules the place. This picture is the "did someone loose this house slipper" picture.
JEB
Old 11-03-2006, 08:20 PM
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Default RE: New OS .70 Four Stroke?

Most of the bad talking I've read about the FL sprung from inverted installations. Since the Kadet is a "flies on the wing" model, I'd go with the 52 Surpass, which is more than enough power, even with a sucrose payload (or, free load).
Old 11-03-2006, 10:13 PM
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Default RE: New OS .70 Four Stroke?

The .52 is my first (and only) OS four stroke and it is one sweet engine.
Old 11-03-2006, 11:46 PM
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Default RE: New OS .70 Four Stroke?

ORIGINAL: low@slow

Read the cust reviews on the FL 70. I think you will opt for the Magnum or the Surpass

-----------------


Every negative customer review of this engine that I have read from folks THAT ACTUALLY RAN THE ENGINE has been from newbies with little or no glow engine experience, IIRC.

I've read comments from "experts" criticizing design features and how they predict the engine will behave, but I can't recall a single incidence of anyone reporting a failure as predicted. This engine has been thoroughly trashed before it ever went into service. I will humbly apologize if someone points out real world failures occuring to experienced engine operators.

Ed Cregger
Old 11-04-2006, 04:13 AM
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asmund
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Default RE: New OS .70 Four Stroke?

Pease do tell me that if you have settled for the magnum 70, that you will go for the magnum 91 instead. Same outside dimentions, virtually the same weight but more power if needed, or for planes to come. It`s like getting a 46 instead of the 40 twostroke. why pick the weakest one?? The magnum 91 can be had as cheap as 137$
Old 11-04-2006, 08:09 AM
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w8ye
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Default RE: New OS .70 Four Stroke?

The 70 and 91 do not have the same dimensions. They are close but still different.

The mounting bolt pattern on the Magnum 70, OS 70, Saito 65,80,91 are all the same.

The Magnum 91, OS 91, Saito 100, 125 Y-S 91, 110 are the same
Old 11-04-2006, 08:46 AM
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Default RE: New OS .70 Four Stroke?

Every negative customer review of this engine that I have read from folks THAT ACTUALLY RAN THE ENGINE has been from newbies with little or no glow engine experience. I'm sure a bunch of newbies bought the Magnum and the Surpass as well, but the negative comments are a whole lot less with them.
Old 11-04-2006, 09:16 AM
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Default RE: New OS .70 Four Stroke?

A .91 in a Sig Kadet??!! Maybe if you're scaling it up 150% to 117" I could see it. That's like putting a G38 on a Kaos 60.[X(] (not really, but you get my point)
Old 11-04-2006, 09:46 AM
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Default RE: New OS .70 Four Stroke?

I ment Low Slow is right
Many of the post of the fl, in fact almost all of them, were started by me. I was still really a nube at tuning at the time. We finally figured out that the fl doesn't like to be mounted upsidedown. I have got it in a funtana x50 and she hovers the bird at around 65% throttle.
Old 11-04-2006, 12:15 PM
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Default RE: New OS .70 Four Stroke?


ORIGINAL: low@slow

Every negative customer review of this engine that I have read from folks THAT ACTUALLY RAN THE ENGINE has been from newbies with little or no glow engine experience. I'm sure a bunch of newbies bought the Magnum and the Surpass as well, but the negative comments are a whole lot less with them.

----------------


That is an interesting and well taken point. Still, I hear a lot of grumbling and rumbling about how the FL-70 should fail, but see very little actual proof that it has failed. Maybe it is just me and I'm missing evidence that is in front of my face, but I don't recall seeing anything really horrific about mechanical engine failings, other than one mentioning of a wiped camshaft. I wish I could recall where I saw that. Of course, I see the same failing mentioned with Saitos and their wiped camshafts. Do you see what I mean?

The OS .70 and probably the Magnum .70 is heavier than a Saito .91. What is the point in buying either the OS or Magnum if that is the case?

Ed Cregger
Old 11-04-2006, 12:20 PM
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Default RE: New OS .70 Four Stroke?

It's real easy to wipe out a cam and/or lifters on an engine where castor oil was used and the engine sat around for two or three years without ever flushing through with after run oil. The valve(s) will stick. You damage the cam and/or lifters when you turn the engine over by hand.
Old 11-04-2006, 12:34 PM
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Default RE: New OS .70 Four Stroke?

I don't think there was much complaining about FL 70 failures, more about not being able to get it to run well in certain situations. One reason people buy OS and Magnum is price. I think OS 4 strokes and Saito are both top quality products and would not hesitate to own either. You can get the OS cheaper though, especially when tower is offering a discount on large purchases. I have not had good luck with Magnum so I tend to stay away but many other people have had good luck with them. As for the weight issue, it depends on what your flying, if a few extra onces make much of a difference or not.
Old 11-04-2006, 06:14 PM
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Default RE: New OS .70 Four Stroke?

Just tested mine today, getting 10,500 rich on a 13-4 prop. Idle is consistant at 2500, little shacky at 2000-2200.
IS 10,500 to much, have i underpropped this engine?
Old 11-04-2006, 06:29 PM
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Default RE: New OS .70 Four Stroke?

12/8, 13/6, 14/4 would be a better choice. Try to keep that RPM beteen 9000-10,000 ready to fly.
Old 11-04-2006, 06:29 PM
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Default RE: New OS .70 Four Stroke?

I'm flying a GP DR-1 with the OS .70 FL and have many, many flights on it without a bit of trouble. It's a great running little engine at an excellent price. I own several Magnum .70's as well as several OS .70 Surpass and have found this engine to be an outstanding value. Very dependable and trouble-free.
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Old 11-04-2006, 06:34 PM
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Default RE: New OS .70 Four Stroke?


ORIGINAL: low@slow

Every negative customer review of this engine that I have read from folks THAT ACTUALLY RAN THE ENGINE has been from newbies with little or no glow engine experience. I'm sure a bunch of newbies bought the Magnum and the Surpass as well, but the negative comments are a whole lot less with them.

----------------


You may be right, low and slow, but I've seen folks go out of their way to trash this engine that have no experience with it at all, based upon prejudice and ignorance. I wasn't directing my comments at you in particular, low and slow.

There seems to be at least two factions among the nay-sayers. There are those that presently own the Surpass II and that somehow feel threatened by the newest OS addition. And then there are the OS haters that love to jump in and trash any OS engine, just because it is OS. All I want to see is a little fairness injected into folks' comments regarding a new resource for we modellers.

I just read all of the RCU reviews and it appears that some of the FL-70s seem to run well out of the box and I also read that some FL-70s take a considerable amount of break-in time, regardless of the owner/operator's experience. That sounds about like my experiences with Magnum, Saito and Enya four-strokes. I don't recall seeing anyone mention the horrendous mechanical failures that were predicted by the "experts" a while back. This is not to say that a mechanical failure will not occur, since it happens upon occasion to every brand of engine that I have ever heard of.

Folks that buy the .70 Surpass are paying more for an engine that breaks-in faster than other engines, regardless of brand name. Why would someone be surprised that a cheaper engine, even an OS, would not handle and break-in as well as the more expensive OS Surpass?

It appears that while some OS FL-70 engines require little or no break-in out of the box, some of them require the break-in procedure that is mentioned in the engine's instructions. Surprised? No, not me.

K&B made ball bearing, top of the line engines, that required minimal break-in. They also manufactured the less expensive Sportster series which could require a lengthy and messy break-in. I didn't hear folks ripping K&B apart for making these engines. In fact, I've owned several and I own two of them now. I did complain about the lengthy break-in, at first, but was very satisfied when the break-in was complete. This appears to be what many of the folks said about the FL-70 too. It ran fine after sufficient break-in time.

Ed Cregger


Old 11-04-2006, 06:59 PM
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Default RE: New OS .70 Four Stroke?

But, Ed, this is the age of instant gratification. If it's not perfect out of the box, it's utter junk!

Seriously, I agree with you about having to pay for fit. But, as you say, that doesn't mean cheaper engines can't run well, too, if properly broken in.
Old 11-04-2006, 11:11 PM
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Default RE: New OS .70 Four Stroke?

Hello; I too was prejudised against the FL70, until I talked to a fellow flyer who has been flying one all year. He said that it was an engine with a few peculiarities, but a smooth running good performing engine for the dollar.

Good point about opinion being formed with no hands-on experience.
Old 11-04-2006, 11:20 PM
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Default RE: New OS .70 Four Stroke?

One member's reported FL70 rpm's are about the same as my Surpass .70
Old 11-05-2006, 01:33 AM
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Default RE: New OS .70 Four Stroke?

I think it was RCKen ( moderator of the Begginers forum) who said he loves his OS 4 strokes but hates the FL70. That was enough for me as he seems to have a lot of expirence.


I went to tower hobbies and the 91 is only 1.2 OZ more than the 70 so if I buy one it will be the 91!

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