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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Post  roddie Sat Apr 08, 2023 6:39 pm

When we fill our vented fuel-tanks.. raw fuel leaks from the vent; as a signal that the tank is full. Correct?


Last edited by roddie on Tue Apr 11, 2023 8:32 am; edited 1 time in total (Reason for editing : some clarification..)
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Post  roddie Sat Apr 08, 2023 6:40 pm

I'm writing..
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Post  Oldenginerod Sat Apr 08, 2023 7:20 pm

roddie wrote:When we fill our vented fuel-tanks.. raw fuel leaks from the vent; as a signal that the tank is full. Correct?


Do you mean stunt tank or conventional (Babe Bee) tank?
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Post  944_Jim Sat Apr 08, 2023 7:34 pm

Well...not always. A couple of my backplates have the nipple with vent hole right next to it, that is, on the same side of the needle. So as fuel is being pushed in, air is being pushed up and out. The ensuing bubbling makes it tough to discern "full," or "just a mess."
What's worse is if I push hard on the hose, it can block the air vent. Then the tank pressurizes through the tank's pick-up tube, passed the jet, and dribbles out the air inlet.

To beat this, I keep a Tractor Supply needle/syringe so I can put the needle INSIDE the filler tube. This even works for my external run tanks.

My Golden Bee/Black Widow tanks are easy...one tube up, one tube down. A good seal between the filler tube and the fuel bottle/syringe will ensure a good, observable fill.

I hope this helps.
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Post  706jim Sat Apr 08, 2023 10:24 pm

A hypodermic syringe with the point filed blunt works great for fueling these engines. Back in the 1970's I used to fly a Guillows Super Cub powered by a Pee Wee 0.020. 0.4cc using a 1cc syringe gave an engine run of around 30 seconds. I believe that a full Pee Wee tank held about 2cc of fuel.
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Post  roddie Tue Apr 11, 2023 8:40 am

Thanks for your interest/replies guys. Please accept my apology for being M.I.A. for a few days. I'll elaborate a little more..

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Post  roddie Tue Apr 11, 2023 8:44 am

Oldenginerod wrote:
roddie wrote:When we fill our vented fuel-tanks.. raw fuel leaks from the vent; as a signal that the tank is full. Correct?


Do you mean stunt tank or conventional (Babe Bee) tank?

Actually Rod; "any tank" having a vent with an accessible "nipple" to which a short length of fuel line can be attached, during the filling/topping-off of the tank.
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Post  roddie Tue Apr 11, 2023 8:54 am

944_Jim wrote:Well...not always. A couple of my backplates have the nipple with vent hole right next to it, that is, on the same side of the needle. So as fuel is being pushed in, air is being pushed up and out. The ensuing bubbling makes it tough to discern "full," or "just a mess."
What's worse is if I push hard on the hose, it can block the air vent. Then the tank pressurizes through the tank's pick-up tube, passed the jet, and dribbles out the air inlet.

To beat this, I keep a Tractor Supply needle/syringe so I can put the needle INSIDE the filler tube. This even works for my external run tanks.

My Golden Bee/Black Widow tanks are easy...one tube up, one tube down. A good seal between the filler tube and the fuel bottle/syringe will ensure a good, observable fill.

I hope this helps.

Yea.. those Cox "single-nipple" tank-backplates that you describe in your first paragraph wouldn't qualify for my Green vent application.
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Post  roddie Tue Apr 11, 2023 9:46 am

We can either let our fuel run onto the ground once the tank fills.. or we can choose a more "Green" approach.

This idea is more applicable to "bench-running" but could also be applied at the field. A fuel "overflow reservoir" can be made from a small transparent vessel.. such as a plastic bottle for receiving a short length of fuel-line connected to the engine's tank-vent nipple. I'm using a clear plastic storage-tube similar in size/shape to a test-tube for use on my bench-run station.

See below photo...

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Below image shows the backside of my station.. and what I devised to mount a wedge-tank.

Green vent..  Green_11

Incidentally; when done running the engine, the "vented fuel" can be evacuated from the overflow by simply  applying "suction" to the tank's filler-tube with a bulb or syringe.
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Post  GallopingGhostler Tue Apr 11, 2023 9:54 am

944_Jim wrote:Well...not always. A couple of my backplates have the nipple with vent hole right next to it, that is, on the same side of the needle. So as fuel is being pushed in, air is being pushed up and out. The ensuing bubbling makes it tough to discern "full," or "just a mess." What's worse is if I push hard on the hose, it can block the air vent. Then the tank pressurizes through the tank's pick-up tube, passed the jet, and dribbles out the air inlet.
Back 30 or more years ago, we used to use clear vinyl tubing for fuel line. This was the stuff that got age hardened but when new, was flexible. It was also reasonably thin walled. The later silicon tubing has a thicker wall. It was this earlier tubing that the hole was offset to miss when filling the tank, IMO.

I don't know why Cox simply didn't place that hole on the other side of the needle valve, where the old duplicate fueling nipple was. There was an advantage to that other fueling nipple. It was easier to see when tank was full, because that nipple directed the fuel in an "aimed" stream, shooting up a half inch or more. Bang! Laughing
roddie wrote:We can either let our fuel run onto the ground once the tank fills.. or we can choose a more "Green" approach.
IMO Very Happy With these small half-A tanks and manual fueling systems, the amount of fuel wasted is so small, less than an eigth of a teaspoon, that the amount of work to recirculate back to a sump or can is a bit of overkill, no? Huh...

The fuel evaporates so quickly after it falls, that in short order it is not there. Or, spread a tarp under where one is fueling, so it can be wiped up with a rag or paper towel.

As the late George Carlin used to say, The earth will do fine after we [the human race] are gone. lol!

Please forgive me, @roddie for my little bit of foolishness here, please don't let me hinder you. This Site Rocks!
Carry on! Beers Beer Cheers sunny Popcorn Old Bugger lol!
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Post  rsv1cox Tue Apr 11, 2023 12:25 pm

As the late George Carlin used to say, The earth will do fine after we [the human race] are gone. lol!

As it did for the billions of years before we got here and hopefully it will recover after we leave. There was a TV series - Life after People - that I enjoyed and never missed a showing.

From Wikipedia.

Life After People is a television series on which scientists, mechanical engineers, and other experts speculate about what might become of planet Earth if humanity suddenly disappeared. The featured experts also talk about the impact of human absence on the environment and the vestiges of civilization thus left behind. The series was preceded by a two-hour special that aired on January 21, 2008, on the History Channel which served as a de facto pilot for the series that premiered April 21, 2009. The documentary and subsequent series were both narrated by James Lurie.
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Post  roddie Wed Apr 12, 2023 9:40 am

GallopingGhostler wrote:

IMO Very Happy With these small half-A tanks and manual fueling systems, the amount of fuel wasted is so small, less than an eigth of a teaspoon, that the amount of work to recirculate back to a sump or can is a bit of overkill, no? Huh...

The fuel evaporates so quickly after it falls, that in short order it is not there. Or, spread a tarp under where one is fueling, so it can be wiped up with a rag or paper towel.

As the late George Carlin used to say, The earth will do fine after we [the human race] are gone. lol!

Please forgive me, @roddie for my little bit of foolishness here, please don't let me hinder you. This Site Rocks!

Carry on! Beers Beer Cheers sunny Popcorn Old Bugger lol!

No worries George.. I've been on a quest to find ways of making our engines run cleaner.. as well as more quietly. This Green-vent-idea is part of that mindset.

Here's a photo showing my bench-run station with a slightly modified Babe Bee with one of my mufflers.

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Green vent..  20230414

One of the muffler pipes (a spent .22 cal. LR shell-casing) has a piece of silicone tubing attached. I made-up a few different sumps or resonators to see how they will behave when the engine is running. IE; will they reduce oil-emissions and/or reduce noise-emissions further.. as compared to running my muffler alone.
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