waterfalls

My Feedback: (26)

Xoar props has em in wood and there extremely efficent. And if you want a custom size, they will MAKE it for you if you buy 6 or more. check em out.
xoarprops.com

bbagle1

I have decided on either a xoar 15x5 3 blade or 16x5 three blade but I dont know which is right for the engine. Will the 16x5 be too much load for a new engine? What about after break-in? Also should I go with the laminated or beechwood props?

Ken6PPC

I don't have any experience with a three blade prop, but I think a 16 x 5 three blade prop would be quite a load on this engine.

I use an APC 16 x 6 two blade prop on my Saito 125.

blw

My Feedback: (3)

The 16x5 3 blade prop will probably be too much for the 1.25. I would be looking for something in the 14" range. Maybe a 15", but I would be halfway expecting it to still be too much prop.

Zimodile

Has anyone run their Saito 125 on a Graupner G-Sonic 15x10? Or anything similar? What sort of performance are you seeing from this size of prop?

Z

togatoga

My Feedback: (42)

Anyone tried an apc 17x4w prop with this engine? I'm going for CP 20% heli mix. looks like this engine loses out in the power department to the FZ110 but good thing is that its lighter. Thinking of putting it in a 68in Sukhoi so the reason for the large prop.

waterfalls

My Feedback: (26)

Listen, I 've tried that prop and every other possible prop on the market with this engine, and by far the best 2 props are
1. APC 16.5x5w (best for quick throttle response and vertical)
2. APC 16x8 ( best for speed )

blw

My Feedback: (3)

The APC 16x6 is pretty good, but I'm going to try the 16x8 when I find one locally. I've heard that it is better too.

Zimodile

Hey all

Started breaking in the Saito 125a today. Here's my readings after around 50oz of fuel.

Temp: 6 degrees above freezing;
Altitude: 500ft
Fuel: Nitro 20%; Klotz synth oil content 23%;
Prop: Graupner G-Sonic 15x8;

Peak rpm: 9,800rpm.

Very happy with this. I am sure that I will have 10,000 with this prop once the motor is leaned off and set-up fully. This was still running reasonably rich.

I am hoping to run this motor with the Graupner G-Sonic 15x10 for a good turn of speed on my CMPro Swallow airframe.

Zim

DLEVETT

My Feedback: (13)

Hi Zim, I have a question for you.
Did your Saito 125 come in a Black and Gold box labelled with "High Compression, High Cam Series" listed on the top front of the box?
The reason I ask is, here in North America our engines come differently packaged but that is not all thats different about our Saito,s.
I was under the impression that the European and Japanese marfket engines have higher compression, larger valves and a different cam.
I,m starting to think that the difference that we see with respect to RPM numbers may have something to do with the different market motors.
I currently have a Japanese sourced Saito 125gk that is turning the same prop 400- 500 rpms faster than my earlier purchased Saito 125 that I purchased here in Canada, and the GK is new still.
Saito 125gk 9000 rpm, APC 16X6 Cool Power 21.5% heli fuel.
Saito 125 8600 rpm, APC 16X6 Cool Power 21.5% heli fuel
Its just a theory.
Anyone with any thoughts ?

thx Dave

Piet Le Roux

In South Africa our sportsman pattern planes are limited to a 91 two-stroke or a 125 four-stroke. I opted for the two-stroke option because of cost and lack of experience with four-strokes. I am glad to see that my OS91fX with tune pipe is not being blown away.
Coolpower 15% pattern blend, 15X8 APC, pipe length 44 cm, altitude 1350m(4430ft) .
9300 peak
9100 rich

Zimodile

Hey Buddy - yes it did come in a box as you describe. It's not a GK though. However, I've had excellent results with fitting the intake trumpet to both my 72 and 82 - these come stock with the GK series - so I'm going to fit that to the 125 as well. You can run them leaner at the low end, I believe due to the decreased spitting of fuel from the carb. Fuel economy is noticeably increased and the transition seems better too...

Z

Flyer95

My Feedback: (1)

I have a Saito 125 and it will turn a APC 16x4w or 15x6 about 9600rpm and APC 16x6 @8300rpm. I like the 16x4w and 15x6 better for aerobatic and 3D on a UCD 60.

bawls

These numbers are quite different. Some are impressive and some are disappointing. Some are better than others...but what are the reasons for this?
Mine falls into the disappointing category.

APC 16x6 30% heli fuel 8500 RPM. No way could 15% yield 9000RPM for my engine.

bawls

Update!

Saito 125 30% nitro 19% lubricant. APC 16x6: 9600+ RPM. Removed the velocity stack and it really woke up.

On The Patch!

Whats a Velocity Stack?

Johan

bawls

intake trumpet, some folks call them.
These engines do not come with them so no worries.

On The Patch!

Is it one of these? Sorry about the quality of photo...its is from my Saito 1.20. You took it off and it came to life? Would've thought otherway around...

bawls

That's it. But the 1.20 uses a different stack than the 1.25. Yours may be larger and may in fact, help the performance on the 1.20

On The Patch!

Ok thanks. Have you got any idea how the 1.20 compares to the 1.25? I know mine is heavier...

bawls

I only have the 125. I hear that they both make similar power though.

Ernie Misner

I've never heard of any size Saito that didn't run better with the stack. Anyone else?

Ernie

bawls

Do you have a 125 with which to see?
Are the carbs different sizes for all the smaller engines?

Ernie Misner

Most all take the exact same stack up through the 125 although the carbs themselves are slightly different. The above post sounds like the 120 takes a different stack, perhaps same one as the larger engines.

Ernie

bawls

yes, there are two stacks. One for the small block and one for the large block.

If a particular stack helps a small carb, that certainly doesn't mean it'll help a large carb. The 125 is the largest carb of the small blocks.