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-   -   RotoFlow clunkless fuel tank (http://www.rcuniverse.com/forum/questions-answers-154/10709869-rotoflow-clunkless-fuel-tank.html)

SigMan 09-10-2011 05:22 AM

RotoFlow clunkless fuel tank
 
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this will be great if it really works. http://www.jlproducts.net/ProductRotoFlow.html


mighty9 09-10-2011 05:55 AM

RE: RotoFlow clunkless fuel tank
 
Neat idea if the seals dont leak on the clunk after time. They also have some other cool items .Thanks for sharing this one

sensei 09-10-2011 06:06 AM

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

jester_s1 09-10-2011 06:20 AM

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.

AmishWarlord 09-10-2011 06:30 AM

RE: RotoFlow clunkless fuel tank
 

The idea of just putting in a bag inside the tank was taken already.

AmishWarlord 09-10-2011 06:42 AM

RE: RotoFlow clunkless fuel tank
 
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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.

landeck 09-10-2011 06:58 AM

RE: RotoFlow clunkless fuel tank
 
The problem I see with it is that there is no way to add a second interal line for fueling/emptying the tank on cowled engines. Also it is pricey and I question reliabiltiy.

Bruce

Gray Beard 09-10-2011 07:46 AM

RE: RotoFlow clunkless fuel tank
 
A much better wheel. :eek: 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.;)

AmishWarlord 09-10-2011 07:49 AM

RE: RotoFlow clunkless fuel tank
 
Hey Bob, post some pics of your pop bottles!!

sensei 09-10-2011 08:57 AM

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

SigMan 09-11-2011 09:48 AM

RE: RotoFlow clunkless fuel tank
 

Quote:

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
cool pop bottle tank !

Gray Beard 09-11-2011 10:13 AM

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.:D 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.

Oberst 09-11-2011 11:41 PM

RE: RotoFlow clunkless fuel tank
 
I see more things that can go wrong with that thing down the road. No thank you, I'll stick with the basic on this one. JMHO



Pete

Sport_Pilot 09-12-2011 06:24 AM

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.

AmishWarlord 09-12-2011 08:13 AM

RE: RotoFlow clunkless fuel tank
 
Muffler pressure? That's to simple. I'd say as Perry pump and carb in conjunction with a header tank are in order here.

Sport_Pilot 09-12-2011 10:07 AM

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.

Ed_Moorman 09-12-2011 02:23 PM

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.

huck1199 09-12-2011 02:26 PM

RE: RotoFlow clunkless fuel tank
 
Ed had the same concern I had - gumming up of the rotating sleeve.

AmishWarlord 09-12-2011 02:30 PM

RE: RotoFlow clunkless fuel tank
 
Oh I'm sure they are like Great Planes fuel tanks and must be replaced every year with a new one.

AmishWarlord 09-12-2011 02:43 PM

RE: RotoFlow clunkless fuel tank
 
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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.

JohnBuckner 09-12-2011 02:57 PM

RE: RotoFlow clunkless fuel tank
 
Quote:

ORIGINAL: AmishWarlord

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

AmishWarlord 09-12-2011 03:15 PM

RE: RotoFlow clunkless fuel tank
 
Thanks for the recommend John. I'll try one on my next glow plane.

ivyspoppy 09-13-2011 06:11 AM

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.

sensei 09-13-2011 07:09 AM

RE: RotoFlow clunkless fuel tank
 

Quote:

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.
We know how much they cost, how much do they weigh?

Bob

GREG DOE 09-14-2011 04:39 PM

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


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