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Cox Engine of The Month
Can it be done? A fixture for testing fuel tank flow under a G-load
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Can it be done? A fixture for testing fuel tank flow under a G-load
When I was building my CEF Reed Speed model.. I decided to build my own external hard-tank. There was no way to know how it would perform in flight.. That got me thinking about how I could test the tank's draw (on suction alone) under a "G" load. I didn't follow through with a test fixture.. (or even a successful flight.. ) but lately I've thought about taking it a step further.
An engine and tank are commonly mounted and bench-run "static".. so why not build a "balanced" rotating beam-type test stand? ..
I'm serious... and I know what you're thinking.. but my idea is to have it be safe. I'm considering making something that will incorporate a simple caliper-brake (bicycle) mechanism to hold and stop the beam from rotating when needed.
An "arm" could be built to accommodate many different engine mounts, by using interchangeable modules with various beam/radial mount patterns... and the fixture would incorporate a "yoke" for tilting the rotating arm, to vary the axis.. to simulate stunt maneuvers.
Wind-tunnels are built to test aero-dynamics.. why not experiment with the effects of G-forces on our control-line fuel tanks.. before putting them in our models? I'm no physicist... but G's are G's.. right? If your tank will draw on a short-arm/high "G" load.. it should draw; out there on the lines.. I would think.
Your thoughts?
An engine and tank are commonly mounted and bench-run "static".. so why not build a "balanced" rotating beam-type test stand? ..
I'm serious... and I know what you're thinking.. but my idea is to have it be safe. I'm considering making something that will incorporate a simple caliper-brake (bicycle) mechanism to hold and stop the beam from rotating when needed.
An "arm" could be built to accommodate many different engine mounts, by using interchangeable modules with various beam/radial mount patterns... and the fixture would incorporate a "yoke" for tilting the rotating arm, to vary the axis.. to simulate stunt maneuvers.
Wind-tunnels are built to test aero-dynamics.. why not experiment with the effects of G-forces on our control-line fuel tanks.. before putting them in our models? I'm no physicist... but G's are G's.. right? If your tank will draw on a short-arm/high "G" load.. it should draw; out there on the lines.. I would think.
Your thoughts?
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
It would be great for speed, but not reliable for stunt.
I think it's a great idea!!
I think it's a great idea!!
Cribbs74- Moderator
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Posts : 11906
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
Roddie, maybe you should contact Igor Burger of Slovakia, the current F2B Stunt world champion as of this month, who builds logarithmic control linkages for his stunters. You, he and Leonardo Da Vinci would have a great time together.
Lol Just kidding!
Lol Just kidding!
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
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...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
you could use a really small hydraulic pump and use that as the pivot point. Add a flow control valve to limit the RPM through resistance from the pump. To measure force use an accelerometer to measure G force. Use a 3 axis digital type with an Adrino microcontroller and transmit the results through bluetooth serial connection to your PC. This way you dont need a slip ring for the wires.
Jason_WI- Top Poster
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Re: Can it be done? A fixture for testing fuel tank flow under a G-load
...or you could just bolt your engine & tank to a plane and go have a good time flying!
Oldenginerod- Top Poster
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Re: Can it be done? A fixture for testing fuel tank flow under a G-load
RknRusty wrote:Roddie, maybe you should contact Igor Burger of Slovakia, the current F2B Stunt world champion as of this month, who builds logarithmic control linkages for his stunters. You, he and Leonardo Da Vinci would have a great time together.
Lol Just kidding!
"Logarithmic Control Linkages"? That's deep..
Well, I appreciate the responses. I guess I'm the kind of person who feels that making something work "better".. rather than just having it work ok.. is worth some degree of thought, even if you get answers as to "why" it won't work any better.
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
I, for one, highly appreciate and applaud such pursuits of knowledge ! To that end, I've decided to employ my considerable engineering talents in designing a prototype device; intended to capture and record those elusive bits of data that may, some day, assist in answering the burning question: "WHY? " !
Designed to be worn on the left arm (please print reversed image for lefty's!), it is slid on, up to the elbow, and held in place by gripping the sawed-off broom handle near the front.
The only other accessory required is a fairly aggressive amusement park roller-coaster. Failing that, a drunken redneck, his pickup truck, and pot-holed county road will suffice.
The rest is pretty-much self explanatory.
I shall now apologize to my fellow forumers for this weak attempt at humor on a late-waking morning when I've had too much coffee and too little sleep!
Designed to be worn on the left arm (please print reversed image for lefty's!), it is slid on, up to the elbow, and held in place by gripping the sawed-off broom handle near the front.
The only other accessory required is a fairly aggressive amusement park roller-coaster. Failing that, a drunken redneck, his pickup truck, and pot-holed county road will suffice.
The rest is pretty-much self explanatory.
I shall now apologize to my fellow forumers for this weak attempt at humor on a late-waking morning when I've had too much coffee and too little sleep!
Kim- Top Poster
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Posts : 8608
Join date : 2011-09-06
Location : South East Missouri
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
Roddie,
It's a good idea, however I agree with Rod. The easiest way to test it is to put it on a plane and sling it.
There is very little risk involved if you are only flying level laps. If the engine quits you just glide in for a landing.
Ron
It's a good idea, however I agree with Rod. The easiest way to test it is to put it on a plane and sling it.
There is very little risk involved if you are only flying level laps. If the engine quits you just glide in for a landing.
Ron
Cribbs74- Moderator
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Posts : 11906
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
Cribbs74 wrote:It would be great for speed, but not reliable for stunt.
I think it's a great idea!!
I guess that there are more variables to an actual C/L "pattern-flight".. that cannot be simulated any other way. Clunk-tanks for P.A... and bladders for high-G/fast-combat; pretty much assure adequate fuel delivery nowadays.
I'd still like to experiment with the idea.. for hard-tanked "speed" models; like you mentioned.
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
I like the set up suggested by Kim. A marvellous implementation and solution to the original requirement!
Wouldn't it be simpler to build a fuel pump?
Wouldn't it be simpler to build a fuel pump?
ian1954- Diamond Member
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Join date : 2011-11-16
Age : 70
Location : England
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
ian1954 wrote:I like the set up suggested by Kim. A marvellous implementation and solution to the original requirement!
Wouldn't it be simpler to build a fuel pump?
As a matter of fact.. not "build" a fuel pump.. but it would be interesting to test a small 12V automotive w/s washer pump, powered by a LiPo pack in a larger model.. The seals are rated for alcohol.. and methanol might not cause a problem. Considerations would be a regulator.. and the pump's "duty-cycle".
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
Kim wrote:I, for one, highly appreciate and applaud such pursuits of knowledge ! To that end, I've decided to employ my considerable engineering talents in designing a prototype device; intended to capture and record those elusive bits of data that may, some day, assist in answering the burning question: "WHY? " !
Designed to be worn on the left arm (please print reversed image for lefty's!), it is slid on, up to the elbow, and held in place by gripping the sawed-off broom handle near the front.
The only other accessory required is a fairly aggressive amusement park roller-coaster. Failing that, a drunken redneck, his pickup truck, and pot-holed county road will suffice.
The rest is pretty-much self explanatory.
I shall now apologize to my fellow forumers for this weak attempt at humor on a late-waking morning when I've had too much coffee and too little sleep!
I would like to order a few dozen of you first production run, make sure you include those instructions, BBBWWWWAAAAAAAAAAAAHHHHAAAAAAA!!!!
crankbndr- Top Poster
- Posts : 3102
Join date : 2011-12-10
Location : Homestead FL
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
I love the "Old School SD card" and the "Old School Data Entry Device"
You could also build and sell bolt on accessories for it such as a spring loaded engine mount and a fish type scale for use as a dyno or sell add on Lexan sleeve with a small fog machine to convert it to a wind tunnel.
The possibilities could be endless!!
You could also build and sell bolt on accessories for it such as a spring loaded engine mount and a fish type scale for use as a dyno or sell add on Lexan sleeve with a small fog machine to convert it to a wind tunnel.
The possibilities could be endless!!
sdjjadk- Platinum Member
- Posts : 640
Join date : 2012-04-07
Location : Southern Maryland
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
Add a set of wheels and a string! Make it a tether car!
Waffleman- Gold Member
- Posts : 141
Join date : 2012-07-18
Age : 25
Location : Fl, USA
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
You know.......
That's not a half bad idea Waffleman.
A tether car type platform would be a good way to test fuel draw.
That's not a half bad idea Waffleman.
A tether car type platform would be a good way to test fuel draw.
Cribbs74- Moderator
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Posts : 11906
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
Build on a chassis from a crappy Glow RC car, that way you can use the brakes to try different amounts of momentum.
Waffleman- Gold Member
- Posts : 141
Join date : 2012-07-18
Age : 25
Location : Fl, USA
Re: Can it be done? A fixture for testing fuel tank flow under a G-load
Build a quintain. Configure it to spin at different angles.
You can always assist the spinning
Remember to duck!
You can always assist the spinning
Remember to duck!
ian1954- Diamond Member
- Posts : 2688
Join date : 2011-11-16
Age : 70
Location : England
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