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09-25-2019, 06:59 AM
I never had issues with the fuel tank position on the FG-11. I had it inverted, and the tank was above the carb. Never flooded, was easy to start and ran great. I now have it in an LT-40 and the tank is below the carb.
09-25-2019, 07:17 AM
The Saito crankcase check valves can make fine pressure. By throttling the outlet check, the pulse can be made stronger.
09-25-2019, 07:35 AM
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I know with the valiant factory tank the carb level was almost at the bottom of the tank . in order to get the low tuned in properly you had to adjust the needle way past the factory recommendations to achieve a proper tune. Then in flight the tune would change when you went inverted with the plane. The engine would also flood in transport . I have a bad habit of not emptying the tank at the end of the day and doing it later in my garage . After lowering the tank i was able to achieve my low settings within the factory recommendations. The motor now holds tune when flying inverted regardless of my tank fuel level, and the motor does not flood in transport any more .
09-25-2019, 12:10 PM
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The Saito engine code is RR for the plain engine and SS for the GK, here are some parts: https://www.horizonhobby.com/SearchD...ain=&pageView=
Macgregor/Hobby Plastic has 72 parts scattered over many pages: https://www.hobbyplastic.co.uk/index...5ktv8mhao8q8s5
Click, Return to Product List to see more.
Last edited by Hobbsy; 09-25-2019 at 12:21 PM.
09-25-2019, 05:44 PM
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if this helps with the Regulator talk,
my manuals for my OS Heli regulators show that a one way valve is used on the engine's back plate to pressurize the fuel tank, but of course these are 2 St engines. so if some one says they are using a regulator on an engine without a pressurized fuel tank, or without a fuel pump and they can not get a rich enough setting, I can see where the problem just may be.
edited, I forgot, I have a fuel pump for my Saito 115
Jim
my manuals for my OS Heli regulators show that a one way valve is used on the engine's back plate to pressurize the fuel tank, but of course these are 2 St engines. so if some one says they are using a regulator on an engine without a pressurized fuel tank, or without a fuel pump and they can not get a rich enough setting, I can see where the problem just may be.
edited, I forgot, I have a fuel pump for my Saito 115
Jim
Last edited by the Wasp; 09-25-2019 at 05:47 PM.
09-27-2019, 12:52 AM
I've never run a fuel pump on any of my saito's, although there may be some installations that would benefit from an accessory pump?? someone say so if you use them and they work well for you. My personal experience at a flying field is the guys running accessory fuel pumps like perry etc spend a lot of time on the ground,
09-27-2019, 01:49 AM
Aside from the crankcase pressure system on the Saito 120 dual plug, pumped, never found a need for a pump or regulator since day one. This includes several inverted installations. The Saito 120 pump system worked fine but there was a bit of a learning curve. The trick was not trying to run with high pressure. It used a needle controlled vent valve to relive excess pressure.
After one season, that pump was removed after relocating the tank. Ran very well without the pump.
Aside from that lone venture, no pump or regulators, thank you
Parts that aren't there never fail or go out of adjustment.
After one season, that pump was removed after relocating the tank. Ran very well without the pump.
Aside from that lone venture, no pump or regulators, thank you
Parts that aren't there never fail or go out of adjustment.
09-27-2019, 02:57 AM
Hey it's not all bad down under, it's the queens birthday long weekend and three whole days off woo hoo! riding the duke down south to a classic bike racing meet where they burn heaps of methanol and castrol R
Try telling that to jet pilots
09-27-2019, 03:08 AM
Great on top too.
Have a nice day . Hopefully the steam boiler and water pump on the Duc hold up. Better take along a spare radiator hose too.
Or is yours the turbine powered Ducati?
Have a nice day . Hopefully the steam boiler and water pump on the Duc hold up. Better take along a spare radiator hose too.
Or is yours the turbine powered Ducati?
Last edited by Jesse Open; 09-27-2019 at 05:03 AM.
09-27-2019, 03:13 AM
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One nice thing I like about a regulator is that you can run the engine very near the peak, the mixture will not change from full tank to empty tank. Economy is considerably better also.
09-27-2019, 04:57 AM
That is not usually a problem here. I seldom use or rely on the last 100 RPM for my particular flying style.
Back in the "All the horsepower, all the time" days, I usually employed YS engines in that case.
Every now and then, when the mood strikes, I still fire up a YS powered favorite. Not only great, steady top end, wonderful steady idle and unbeatable transition to boot.
It is indeed all for fun.
Back in the "All the horsepower, all the time" days, I usually employed YS engines in that case.
Every now and then, when the mood strikes, I still fire up a YS powered favorite. Not only great, steady top end, wonderful steady idle and unbeatable transition to boot.
It is indeed all for fun.
09-27-2019, 06:43 AM
If the FG-11 floods, it is possible the carb is damaged. It has a pump in it with check valves, and there may be some debris that is keeping one of them from fully closing, and that will cause it to leak and run poorly. I have never has gas leak out of it regardless of tank position. Might want to consider rebuilding with new gaskets. According to the manual, there is no limitation to where the tank is positioned in relation to the carb with the exception of distance, 200mm Center of tank to center of engine.
09-27-2019, 10:59 AM
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Cap, I just ran the 50-a that you passed on to me, it's a live one; and smooth as silk with the perfectly balanced Bolly 11.5 x 6.
Engine=====Saito 50-a early model
Fuel=======Wildcat 10% with 18% full synthetic
Prop=======Bolly 11.5" x 6"
Plug=======Glow Devil 4c for Saito and Enya
Exhaust====Stock for this engine
Idle=======Per picture
Max RPM==Per Picture
Photo's by Samsung Super 8
Early Saito 50 with A on the right lug
Rock steady and smooth, I did not move it from where Captain Crunch had it.
Speaks for itself
09-27-2019, 12:58 PM
09-27-2019, 01:37 PM
According to the manual, there is no limitation to where the tank is positioned in relation to the carb with the exception of distance, 200mm Center of tank to center of engine.
Last edited by Glowgeek; 09-27-2019 at 02:19 PM.
09-27-2019, 04:53 PM
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[QUOTE=acdii;12552927]If the FG-11 floods, it is possible the carb is damaged. It has a pump in it with check valves, and there may be some debris that is keeping one of them from fully closing, and that will cause it to leak and run poorly. I have never has gas leak out of it regardless of tank position. Might want to consider rebuilding with new gaskets. According to the there is no limitation to where the tank is positioned in relation to the carb with the exception of distance, 200mm Center of tank to center of engine.[/QU
the motor ran great . The only problem was the low adjustment changed considerable with fuel height. once the tank was down below half or more and the pumped had to pull instead of having the pressure of the fuel above the carb height the mixture would run leaner ,and need a readjustment. The motor would flood after sitting a hour or more after the motor shut down . break the siphon on the tank and it could sit with a full tank for ever. My motor was not the only one with the same conditions. Two other fg motors in the same air frame a 14c and another fg 11 were experiencing the same results. since i have lowered the tank to the center line all of the above conditions have stopped and the motor holds the same adjustments no matter the fuel level. so maybe i am compensating for a faulty carb but it runs like a swiss watch now .
the motor ran great . The only problem was the low adjustment changed considerable with fuel height. once the tank was down below half or more and the pumped had to pull instead of having the pressure of the fuel above the carb height the mixture would run leaner ,and need a readjustment. The motor would flood after sitting a hour or more after the motor shut down . break the siphon on the tank and it could sit with a full tank for ever. My motor was not the only one with the same conditions. Two other fg motors in the same air frame a 14c and another fg 11 were experiencing the same results. since i have lowered the tank to the center line all of the above conditions have stopped and the motor holds the same adjustments no matter the fuel level. so maybe i am compensating for a faulty carb but it runs like a swiss watch now .
09-27-2019, 05:31 PM
