an odd fuel tank placement
#1
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an odd fuel tank placement
I have larger glow engines and a gasser......but I want to do a special project with a .15 OS LA glow engine. My Question: How far back from the motor can I place the fuel tank and still get a good fuel feed?? Thanks in advance........ lownslo
Bob
Bob
#2
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RE: an odd fuel tank placement
The closer to the engine for the tank, the better the engine will run.
It would be up to you in the project to determine this value?
The engine would most likely run fine with the tank ten feet away horizontally but you let the vertical position get more than a couple inches off and the engine performance will deteriorate rapidly.
It would be up to you in the project to determine this value?
The engine would most likely run fine with the tank ten feet away horizontally but you let the vertical position get more than a couple inches off and the engine performance will deteriorate rapidly.
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RE: an odd fuel tank placement
Thanks for a prompt reply. I had a Dynaflite Butterfly that I removed the LG and flew, and thermaled like a glider. (I once had a flight of over 45 minutes). I like my big planes but this is a relaxing change. Since that time I replaced the .15 LA with electric power....... flew it for a while and then sold it after building a very nice, electric sailplane. I have this other Butterfly kit under the bench, I want to kit bash it, and fly again with my old .15 LA. My object is to try to get the tank as close to the CG as possible for a more constant balance empty or full. I will make a test stand with the new tank moveable. They try running the motor with different distances and angles to test runability. .... lownslo
#8
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RE: an odd fuel tank placement
The Jett tanks you can find at www.jettengineering.com (some awesome engines, too).
The Tettra from www.centralhobbies.com or from www.pspec.com (performance specialties, home of the Nelson racing engines, too)
Good luck!
The Tettra from www.centralhobbies.com or from www.pspec.com (performance specialties, home of the Nelson racing engines, too)
Good luck!
#9
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RE: an odd fuel tank placement
Using only muffler pressure as a fuel feed would probably allow you to move the tank back to over the CG and not have any problems in level and down line flight. Once the airplane is flown toward the veritical the fuel pressure will have to "lift" the fuel from the tank to the carburetor and the distance from the tank to the carburetor will start to become an issue. The distance the fuel will be "lifted" in the vertical will depend on the amount of pressure generated in the tank and size of the fuel line (capillary effect). Some small amount of suction may be present from the carburetor, but probably not enough to cause any noticable gain in "lifting" the fuel from the tank to the carburetor.
Those are my thoughts, anyway.
Regards,
doubledee
Those are my thoughts, anyway.
Regards,
doubledee
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RE: an odd fuel tank placement
I suggest that if you want to mount your tank over the CG, install a Cline or Iron Bay system. These use a check valve in the muffler pressure line and fuel pressure regulator up near the carb. It will push fuel forward for you with great reliability. May not look pretty but does the job.
Cheers,
Chip
Cheers,
Chip
#12
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RE: an odd fuel tank placement
Smaller engines don't seem to draw fuel very far. The complexities and benefits of placing the tank on the CG are likely to be overshadowed by engine problems. However experimenting will be fun and educational.
Bill
Bill