RotoFlow clunkless fuel tank
#3
RE: RotoFlow clunkless fuel tank
Looks heavy as hell, I notice they don't post the weight, only the over inflated price. I think I will stick with soda pop bottles.
Bob
Bob
#4
Moderator
RE: RotoFlow clunkless fuel tank
Looks like an engineering student got bored and created a solution to a problem that does not exist. A properly set up standard tank does not foam, does not get the clunk stuck forward, does not leak, and does not bubble.
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RE: RotoFlow clunkless fuel tank
New Du-Bro miracle tanks!
Thanks to an elastic tube mounted to the pick up weight you can now do away with sealed aircraft bearings, complicated rotating apparatus, and high prices.
The new fuel tubed clunk system can be your's for only $6.19 for a 16 oz. tank as apposed to $35 from a competitor. Buy five tanks and still pocket some change!!!
Warning, clunked tanks may be susceptible to foaming, clunk jams, and bubbles if tank is not packed in foam and set up per instructions.
#8
My Feedback: (-1)
RE: RotoFlow clunkless fuel tank
A much better wheel. The web page no longer works or I would have posted the video again. A couple years back someone posted a video from Germany. The idea was to show people what the fuel in your tank does during flight. A tank was hard mounted up by the fire wall on the outside of the plane, a camera was mounted onto the wing tip facing the tank. The video was a split screen so you could see what stunts the plane was doing and at the same time watch the fuel tank. It was an eye opener, I never thought the fuel moved around in the tank that much. Better yet, it showed the fuel we have today doesn't foam up due to vibration. Hard mounted up front and not a lick of foam. Guess the anti foaming agents they use in the fuel really do something.
Anyway, those really are cool tanks but due to the fact I have never had any real tank problems I will stick with the old stand by. Take a look at the bottle tanks sensi makes up and how he sets up the fuel line itself, very cool. I used to make mine with shampoo bottles but pretty much anything will work.
Anyway, those really are cool tanks but due to the fact I have never had any real tank problems I will stick with the old stand by. Take a look at the bottle tanks sensi makes up and how he sets up the fuel line itself, very cool. I used to make mine with shampoo bottles but pretty much anything will work.
#10
RE: RotoFlow clunkless fuel tank
Here is one of my soda pop bottle tanks, I think the whole thing weighs 1.5 ozs. http://images.rcuniverse.com/forum/u...39/Ql33302.jpg You can see more pics in this thread
http://www.rcuniverse.com/forum/m_5153525/tm.htm
Bob
http://www.rcuniverse.com/forum/m_5153525/tm.htm
Bob
#11
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RE: RotoFlow clunkless fuel tank
ORIGINAL: sensei
Here is one of my soda pop bottle tanks, I think the whole thing weighs 1.5 ozs. http://images.rcuniverse.com/forum/u...39/Ql33302.jpg You can see more pics in this thread
http://www.rcuniverse.com/forum/m_5153525/tm.htm
Bob
Here is one of my soda pop bottle tanks, I think the whole thing weighs 1.5 ozs. http://images.rcuniverse.com/forum/u...39/Ql33302.jpg You can see more pics in this thread
http://www.rcuniverse.com/forum/m_5153525/tm.htm
Bob
#12
My Feedback: (-1)
RE: RotoFlow clunkless fuel tank
And when your setting up any type of the normal cheap tanks you too can install a length of brass tube in the center of your pick up line so that dreaded stuck fuel line can't happen. Bungs will loosen and harden over time but for $2.00 you can buy a new one. Pop bottle caps just screw on and a cheap O-ring can be used so they don't ever loosen up. Lot of ways to skin that cat. No real reason to be paying through the nose for a fuel tank.
#14
RE: RotoFlow clunkless fuel tank
So, how do you set this up for uni-flow? If you add a secondline tied to the pick-up for the muffler pressure it would get wrapped aound the axle.
#16
RE: RotoFlow clunkless fuel tank
I don't fly 3D so a header tank would offer nothing. However I set up most of my tanks as uniflow which is not possible here. I would say a bladder tank would be better and there is no need, nor way to set up uniflow on a bladder tank, but I don't like filling bladder tanks.
#17
My Feedback: (1)
RE: RotoFlow clunkless fuel tank
This is an old, old idea from many years ago. I remember seeing something like this in the 1950s. It turned out that flexible fuel tubing was easier, cheaper and worked as well.
I also question how long the fitting would rotate after glow fuel had been after it for a year or so, especially if the tank was left over the winter. These would probably be good for gasoline.
I also question how long the fitting would rotate after glow fuel had been after it for a year or so, especially if the tank was left over the winter. These would probably be good for gasoline.
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RE: RotoFlow clunkless fuel tank
This reminded me of a system I saw in a Tips and Tricks book.
You take the clunk and solder it on to a length a brass tubing that is 1/4 inch from the back of the fuel tank and 1/2" to the tube sticking out of the bung. You use fuel tubing to connect the clunk "wand" to the bung tube. Worked great. I had forgotten about it.
#21
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RE: RotoFlow clunkless fuel tank
ORIGINAL: AmishWarlord
Oh I'm sure they are like Great Planes fuel tanks and must be replaced every year with a new one.
Oh I'm sure they are like Great Planes fuel tanks and must be replaced every year with a new one.
With all due respect AW if you would try Hayes tanks I think you will find that problem a thing of the past.
One thing that subject tank has that is long over due is the "O" ring type plug and its a double. Been using mostly Hayes tanks for about eight years now and they are far more reliable than any of the expansion bung types.
No idea how the rotating pickup works but I love it when folks think outside the box, If not we would not have most of the wonderful inovations we all enjoy today. Thanks for posting the link SigMan.
Even the single Hayes "O" ring tanks are far better and I use them almost exclusively save for some Tetra Bubbless on appropriate airplanes. Heck I don,t do a whole lot with gassers but I do have two 50 cc ships and even use the Hayes with them.
John
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RE: RotoFlow clunkless fuel tank
THe guy that invented it is in my club, and he has been flying the for several years and no problems. I see him at the flying field for 2 years and the work w gas glow and smoke w no problems.
#24
RE: RotoFlow clunkless fuel tank
ORIGINAL: ivyspoppy
THe guy that invented it is in my club, and he has been flying the for several years and no problems. I see him at the flying field for 2 years and the work w gas glow and smoke w no problems.
THe guy that invented it is in my club, and he has been flying the for several years and no problems. I see him at the flying field for 2 years and the work w gas glow and smoke w no problems.
Bob
#25
RE: RotoFlow clunkless fuel tank
Harold Debolt sold an all brass round tank with a rotating pickup under his Demeco product line.
That was in the 50's or 60's. Corrosion eventually would cause the pickup to seize up. There was
no extra weight on the rotating pickup; just one brass tube sliped over another brass tube.
So this idea is not new, and I agree with several of the other people, Hayes tanks are simple
very reliable, strong enough that they often survive crashes, and relatively cheap. Greg
That was in the 50's or 60's. Corrosion eventually would cause the pickup to seize up. There was
no extra weight on the rotating pickup; just one brass tube sliped over another brass tube.
So this idea is not new, and I agree with several of the other people, Hayes tanks are simple
very reliable, strong enough that they often survive crashes, and relatively cheap. Greg