fritzdecat

I have a Saito 125a in my Sig Four Star 120. I have a 16 oz tank in it.
Should have shoehorned a larger 24 oz in there. Getting about 9 minutes flight time is tricky

Makes me wonder how much flying time the guys with the Saito 150' and 180's getor do they know of a large tank supply that I missed?

I thought Sullivan had a large selection but they have few in the 24 oz size....

blw

My Feedback: (3)

I have a 12 oz tank for my 1.25 and I'm getting more than 10 minutes a flight. I've checked after 10-11 minute flights and I had a lot of fuel left in the tank. It sounds like you are running too rich. That will use up the fuel in a hurry. Unless you are running at wide open throttle most of the time, check your low speed needle valve setting.

rcdude7

My Feedback: (264)

Dubro has a 24 I think.

fritzdecat

It is a new engine and I am wanting to play it safe on the rich side.
I suppose as it begins to get more broken in the leaning out will
help the fuel consumption .
It still amazes me that they don't make more large capacity tanks for these engines. Long and narrow so they don't require custom fits?
I tried the Dubro 24 at the hobby shop when I was selecting a tank, it did not fit at the time, should have made it fit by dremel tool widening

blw

My Feedback: (3)

You can start leaning out the engine somewhere around the 4th tank of fuel. The engines really need to be broken in on a test stand, especially the 1.25 if mine is a typical case.

You should be getting more than 10 minutes in the air after the recommended break in on a 16 oz tank and landing with fuel to spare. What prop and fuel are you using on the engine?

fritzdecat

I broke the engine in on a test stand ran about five tanks thru it very rich. Leaned it back a bit to where it tachs around 8300 at wide open
with a 16X8 APC prop

burning Omega %15 glow fuel.

Going very carefull with leaning out. I have about 10 sub 8 minute flight on it now

Edwin

My Feedback: (2)

You're ready to lean that engine out. I have four saito 1.20's. Dont know how much similarity there is but I generally use 14oz tanks. I set my timer for 10 minutes. I consider that enough time for playing around. I still usually have 1/4 tank left. I use the smaller tanks now cause I had a near fly away on a rascal110. With a wood prop, I get around 8500 to 8700 with a 16x8. With the APCs and MA Classic series 16x8 I get about the same number as you. But I run 10% 2-stroke fuel.
Edwin

onewasp

You are running so rich it is hard to describe!!!!!!
A 16 oz tank should be giving you around 11.5 to12 minutes at WOT with some to spare.

Before I learned how to tune a Saito I once got but 10 minutes (16oz. tank) from a 150 at WOT----yours is even more ridiculous than that was.
A 14 oz should be plenty and a 16 should let you fly a 10 minute sequence on 30% with plenty to spare. You are doing neither yourself nor your engine any favors running that rich. Rich runs are often accompanied by severe vibration as well.

I can get 10 on a 180 with a 16 ounce. Even a YS 110 will be happy with a 16 ounce for a 10+ minute sequence....... You are way out there!

fritzdecat

Ok.....IMA a gonna lean out this sucka and in the process of doing so I will report back here with results, video etc.

Thanks for the help

fritzdecat

Well I leaned it out gradually and timed it on the starting bench to see how long it would run and it went for 16:54.....quite an improvement.

The tach reading with a 16 X 8 prop is 8400


I'm learning. Just been at this game for about seven months now.

Really liking this motor. Quiet and strong.

Thanks for the help

JustErik

No one mentioned a velocity stack yet, so I'll take the liberty of doing so. I have one of these fitted to my Saito 100 and get about 8 minutes out of a 6 ounce tank, with a bit left over in reserve, which I think is pretty respectable. For me, light weight is more important than flying time, so while I could fit a bigger tank, I'm sticking with the 6-ounce for now.

Anyway, the stack is cheap and effective. It won't make more power, but it will increase efficiency because less raw fuel gets sprayed back out of the carb.



(click the pic!)

E

fritzdecat

Thanks for the tip

Going to order one .[8D]

blw

My Feedback: (3)

I have one on my .72, .82, and 1.25.