RE: Welcome to Club SAITO !

RE: Welcome to Club SAITO !
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RE: Welcome to Club SAITO ! - 5/17/2008 1:24:28 AM

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From: Ashland, KY, USA
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I tached my 125 with the APC 16x6. 8200 is about it. It now produces about 9lbs of static thrust. It's the first prop that could hold the plane's weight vertical. I think it weighs about 9lbs. Maybe more.

But 9000 RPM would really be a hoot. I bought this engine expecting 9000. I don't mind giving all my Wildcat 20/20 away and buying 30% nitro fuel if it can give me the 9000.
Their website says 9000 on 15% though. I can live with buying 30%. Is there a chance it might?

I can see how the APC 15x6 would be a better prop to get the RPMs up. I might try that one next.

But do I have a better chance at exchanging this engine with a new one (Horizon customer service does rock)? I seek more power urgently.

(in reply to vince.b)

RE: Welcome to Club SAITO ! - 5/17/2008 1:44:44 AM

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From: Hamilton, OH, USA
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Mike, is it my imagination, or does that pink fuel tubing in your picture run from the nipple on the backplate into your flex pipe? That hose needs to be open to allow pressure pulses to go both in and out. It also expels excess oil through that tube.

If that hose is connected on both ends, disconnect it and let it hang loose. Then reset your needle valves and check your RPM's again!

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RE: Welcome to Club SAITO ! - 5/17/2008 1:59:25 AM

w8ye

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Even though it is connected at the outlet end of the flex pipe there's a pretty good chance that it will have some back pressure

< Message edited by w8ye -- 5/17/2008 2:00:23 AM >

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RE: Welcome to Club SAITO ! - 5/17/2008 2:17:35 AM

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I isolated every single variable. Including a shorter tube for that application that was to open air. I did the water test on both nipples and there is, in fact some pressure on that far end nipple. (Not nearly as much as the front one. The front one can push almost 8" of water out and the back one about 2-3) But I can also watch the oil moving through the tube. It has no effect on the speed of the oil droplets exiting the tube. I tell you, the mess comparison is night and day. I would happily sacrifice a couple hundred RPM for the zero mess aspect. But, it really cannot be seen on the tach.
I didn't have the correct sized allen head wrench to fix the servo linkage for my retracts so I couldn't fly it today, damn. The weather is gonna be terrible all weekend. Anyways, I ran two more tanks through it today since I couldn't fly it, I experimented more with the needles. I am pretty sure the needles are at a good setting on both the LS and HS. It idles at 2000 and doesn't hesitate when transitioning to WOT. It immediately hits the redline at 8200, or lower if I richen up a few clicks so it maxes at 8000.

The elbow, the flex exhaust, the stock muffler, the stock muffler with the 90, the crank vent connected or not, different glow plugs, etc. All isolated and have nothing near the effect I am needing.

I was looking at other engines...and I remember why I chose this one. The claimed power/weight ratio is unparalleled in any other 4 stroke. Just not observed.

P.S. The water test on the crank vent would be 100" or more, I'd imagine.

< Message edited by mike early -- 5/17/2008 2:21:04 AM >

(in reply to w8ye)

RE: Welcome to Club SAITO ! - 5/17/2008 3:01:37 AM

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From: Hampton, VA, USA
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Something is definetly up with the engine then. I wish I could tell you whatit was, but Ive seen the 125 pull the 9-10+ pound funtana 90 around pretty decent.Nothing exciting to tell you about, pullout from hover was less then exciting and uplines needed a bit of momentum. But still more then what you seem to be seeing.

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RE: Welcome to Club SAITO ! - 5/17/2008 12:27:04 PM

N1EDM

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Mike, could you explain how you got those numbers for the water test? I've never heard of using that for a model engine. That could be interesting.

I'd also have to agree with W8YE and Ken6PPC about trying a run with just simple pressure to the tank and letting the backplate vent run free to the atmosphere.

Ken, is that PPC in your name from somemilitary piloting you might have done?

Bob

< Message edited by N1EDM -- 5/17/2008 1:34:23 PM >

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RE: Welcome to Club SAITO ! - 5/17/2008 12:43:35 PM

Hobbsy

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You may very well see the oil moving at the same speed as going directly out but that arrangement could still be causing back pressure in the crankcase. One of the biggest secrets to max power is to keep things short, as straight as possible and simple. Are you sure the throttle opening all the way, that looks pretty iffy to me.

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RE: Welcome to Club SAITO ! - 5/17/2008 1:40:16 PM

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From: Victoria , BC, CANADA
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saito 220
I have a few more flights on the sundowner.
I am useing a 17.5x12 on 15% nitro 20% oil and every couple of flights I can hear, see and feel the engine getting stronger.
The idle is still a bit finicky at 1800 but it has richened up again and there is no onboard glow, not to mention its the same plug from the very first run.
Just my 2 cents

Nirto is an oxygenator. @ 30% there is over 60 more oxygen in the fuel.
Oil of course it lubes the parts but it also pulls heat out the engine, and the big one it will retards the timeing or avdance the timeing.
more is retarding, less advances
Hmmm.... I have the vent hose running to the bottom of the landing gear. I am going to trim that up. what do you think ?

< Message edited by vince.b -- 5/17/2008 1:43:24 PM >

(in reply to Hobbsy)

RE: Welcome to Club SAITO ! - 5/17/2008 1:51:25 PM

w8ye

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From: Taylortown, OH, USA
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Bob,

Mike has two pressure taps on his exhaust. The front one is the true pressure tap that goes to the tank. The rear one is where the crankcase is connected

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RE: Welcome to Club SAITO ! - 5/17/2008 6:30:47 PM

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Joined: 10/28/2007
From: Ashland, KY, USA
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To see if a tube has air pressure, one may hold it under a water. It takes pressure to displace the water that fills the tube. The deeper the tube is, the more pressure is required to blow bubbles. I read somewhere that 6" is good enough to pressurize a fuel tank.

I also ran my engine with a very short open-ended tube on the crank case vent. No observable effect on WOT Prop RPM.

(in reply to w8ye)

RE: Welcome to Club SAITO ! - 5/17/2008 6:47:59 PM