Anyone ran one yet? How does it tach compared to the Saito and the Magnum 30?

Yeah, and how does it compare to the ol' .26 FS? I always had trouble with finicky carburation on that one.

mt

OS .26 / OS .30

9x6 Zinger 9800 / 11000
9x5 Zinger NA / 11300
10x4 APC NA / 10800

These are approximate as I recall them. The OS 26 was well broken in, while the 30 only had about 5 or 6 tanks through it. The OS .26's spec is 11k, while the 30's is 13k. I plan to try a 9x4 APC prop next. I would like to see 12k.

I was going to sell my Speedy Bee with the OS 26, but when I saw that the 30 was rated at 20% more power, I thought that this is what this plane needed to bring it back to life (without too much noise, which is a consideration where I fly and I really don't like electric. The OS 30 does seem louder--maybe the higher rpm.)

I have only flown the plane with the 9x6 Zinger on both engines. With the 30 I had no problem taking off in grass and no wind, while with the 26 it was quite a task to get enough airspeed to lift off. I hope the APC 9x4 will slow the plane down some and give it better vertical climb.

16 minute flights with the 26 vs 14 minute flights with the 30, but I may still be rich on the 30.

I'm sold - OS 26's are not in my future no matter how cheap they get.

Has anyone done a similar test comparing a saito-30 ? They seem to have the same weight and power specs. Is the Saito worth the extra money? I'm buying two for my twinstar.

Zinger 9x4 = 12,000 rpm

Although this looked like a good rpm for this engine, the Speedy Bee flew too slow into the wind for my liking. I has settled on using the Zinger 9x5 with this plane and engine combo.

Dear JSchenck:

The PIPE Here again...and at http://www.rcuniverse.com/showthread...681#post419228 you can see what my Saito FA-30 got for RPM readings as it finished its first gallon of Red Max four stroke fuel in my test stand!

Yours Sincerely,

The PIPE! )

pmcderm-

Is the carb air bleed or 2-needle?

-Jeremy

It is air bleed, but it works fine.

It is indeed a bleed-air idle type. The model number is "20N".
The intake tube is cast as part of the body. There is no choke flapper. The carb looks a lot like what is on my 25FP.

I tried to take some closeup shots with my digital camera- that didn't work out, way too fuzzy.

HI: Just wondering how you're OS30 is doing with some more hours on it. I never knew they made a 30 now.

I've been searching for a review/comparision of this & the other small 4 strokes, but haven't found a one.....

However, I dug up some of my old testing of my 26 Surpass. In comparison, it looks like mine was perhaps exceptional?

Stock:
10x4 Graupner 10,700
9x6 Master Air 11,100

With slight mods (enlargement) to carb, muffler, and intake port:
10x4 Graupner 11,400
9x6 Master Air 11,700

These were tested at around 2000 ft. altitude, and using 10 to 15% fuel, I think Byron's, if I remember correctly.

Anyone else out there have figures or direct comparison of the Saito, Magnum, and OS 30's to each other, and to the 26 Surpass?

Let me know, [email protected]

I have bought two OS-30's now and am installing them on my twinstar. I have not run them yet since it is frikin' cold here. As soon as I do run them I will post numbers for both engines to this thread and probably start a new one.

I am still second guessing myself on the saito vs. OS. I will try and get one of these engines on a postal scale before mounting them up.

They are nice looking engines! I wish the valve cover was a bit better for finish, like the HP gold cup engines or the black-crinkle paint on my Chevy V-8's valve covers, but oh well.

Can you weigh one of these OS 30's with the muffler for us? I read elswhere that OS claims 12.5 oz, and that writer was saying this is the same as the 40 Surpass weighs! Is this true?

I will weigh the 30 and post it as soon as I can find a scale that'll do the trick. I may take it by the post office and see if I can use a scale there.

Does anyone have a 40 to weigh? I find it hard to believe that the OS engineers would replace a ~10oz engine (the 26) with a ~12oz engine. The specs say that the muffler weighs over 2oz, which I can tell you it does not because it's much lighter than a servo just by the 'pick it up' measurement.

does anyone have a real-world weight of the 26 also?

My 26 wieghs 10oz (or a hair under) with muffler.

I also just saw some notes of mine I forgot, regarding a Magnum 30 I briefly ran in (it seems to still need more run in time).

I wrote it was 9.6 oz, (I'm assuming with muffler), and show that it turned a 10x6 APC at 9800 to 10,000.

Anyone else have any figures on the 10x6 APC on their 26's or 30's?

I just took one of my 30's to the post office and weighed it.

The engine weighs 9.1oz and the muff. is .6oz. OS has the weight wrong on their documentation which makes sense since the 30 is the same block as the 26, not the 40. I can't imagine why they would say the muffler weighs 2oz !!??!

The reason I bought the 30 is because I assumed the specs for the weight were wrong and I didn't want the extra 6oz. on my twinstar of a pair of 40's.

I'll have them mounted on my twinstar in the next few weeks and will start getting performance numbers.

That's good! So the 30 must wiegh the same as the 26, perhaps less by a hair.

Let us know when you get your performance figures.

Did you weigh the OS-26 on a fine scale? I'm curious to see what the weight really is, down to the 1/10 of an ounce - is OS correct on that document?

Also, what is the real weight of your Magnum?

Not SO fine of a scale... a five pound postal scale with 1/2 big marked graduations. But it's proven pretty accurate relative to all the other motors I've wieghed, they come almost exactly to what the magazine reviewers record on an engine review.

I'd have to dig my own records out, but I couldn't give you a 1/10th oz. resolution. However, I can tell you from memory that the 26 was 9.6 to 9.9oz, and I would bet that would be very accurate. And I've just found my record that the Magnum 30 I ran wieghed 9.6oz, on the same scale. I'm assuming this was also with muffler. Allowing for variations of the scale, I'd say for our purposes the two weigh virtually the same.

But the OS ran much cleaner, and hardly blew any fuel out the exhaust. The Magnum seems to run like a big roudy pig. But it also seems to need a lot more break in. After that, perhaps it will be a great engine. There seems to be mixed opinions out there on these.

Bottom line is --

Saito / OS / Magnum weight is virtually identical. Buy the one you like and/or trust.

It would be interesting to do a side-by-side run of the saito and OS. Which one pulls the RPM given the exact same prop/fuel/temp, as in swap the prop from one to another, using the same fuel tank and measure with the same tach. I wonder how the Magnum would fair.

I just heard of this coming out a couple weeks ago!

Anyone have any figures on it?

The NEW Saito 40 is called the Saito FA-40A

Horizon Hobbies propaganda

I would have bought these if they had been out when I got the OS's .. DANG!

oh well, I'll bet the OS-30's will be good engines. I hope they have the power to pull the twinstar out of the grass I fly off of.

If not, perhaps I'll get two Eaglet kits and build the twin Eaglet I've been fantasizing about.