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Author Topic: RotoFlow Fuel System  (Read 8074 times)

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Offline purercradio

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RotoFlow Fuel System
« on: July 31, 2012, 14:02:25 PM »
Wiz asked me to do a write a Review on on this new Fuel Tank.



Not every day something comes along thatís truly new.  RC Fuel Tanks havenít changed in long time and we all deal with the same old problems of leaks and misplaced clunks after a hard landing! Also when we come to do maintenance on our models - often we forget to check the tubing inside the tank and ensure the clunk is working properly etc. In my own personal experience I have lost my favourite YT International  Adrenaline due to these kinds of problems

The new RotoFlow Fuel system - in my view is revolutionary with its internal clunkless design. It was alledgedly developed over a 4 year period for the US Military to be used on UAV's.

Inside each tank is a fully engineered fuel pickup system that has a large easy moving fuel pickup thatís always going to be in position for proper fuel flow regardless of the attitude and position your aircraft. The RotoFlow clunkless fuel tank has a brass rotary fuel pick-up that works on the principle of centrifugal force to ensure constant and reliable contact with fuel. Suitable for all type of models but I would say probably more so for the Aerobatic boys



RotoFlow tanks and hardware are compatible with Glow fuel, Petrol , Jet Fuel , and smoke oil materials out the box. No need to change stoppers or worry about the internal tubing going brittle etc

Features include:

- The Fuel is drawn away from the foam layer at the wall of the tank
- No internal hoses or connections to harden, or leak air or fuel
- A harder-hitting throttle response due to the ability to draw from a more foamless and air bubble-free fuel supply
- Works with petrol or glow fuels
- Zero maintenance
- Triple-sealed, machined stopper will not leak.
- Barbed brass outlet nipple secures both 1/8″ and 5/32″ fuel hoses
- Aerospace seals for performance and durability
- No assembly





CON: More expensive than a standard fuel tank but your get peace of mind.

They can be purchased here
http://www.klasskote.co.uk/catalog/rotoflow-fuel-system-p-283.html
« Last Edit: July 31, 2012, 14:21:19 PM by purercradio »


Offline rogerandout

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Re: RotoFlow Fuel System
« Reply #1 on: July 31, 2012, 14:41:01 PM »
Seems no air inlet to replace used fuel, what happens in a nose down descent???

Offline The Saint. (Owen)

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Re: RotoFlow Fuel System
« Reply #2 on: July 31, 2012, 15:26:30 PM »
It looks okay but I've used the good old clunk for yonks with absolutely no problems so I will just keep on using it.  :study:
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Offline purercradio

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Re: RotoFlow Fuel System
« Reply #3 on: July 31, 2012, 15:58:09 PM »
It has two nipples on the the bottle for air etc

Offline rogerandout

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Re: RotoFlow Fuel System
« Reply #4 on: July 31, 2012, 16:08:57 PM »
It has two nipples on the the bottle for air etc
and when the aircraft is nose down???


Offline purercradio

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Re: RotoFlow Fuel System
« Reply #5 on: July 31, 2012, 22:40:31 PM »
I am not sure if I am being a numpty  ;D most likely. I don't understand what you are getting at. What happens to your Clunk when your model is nose down? Depending if it is a sudden dive or just nose down. Nose down the clunk will sink to the lowest point in the tank and held at a point by the tension of the tubing

The Rotoflow Clunk swivels on the brass tube. This is one of the benefits. Rather than thrashing around in the fuel potentially causing bubbles -  The RotoFlow Clunk follows the fuel on a swivel action.

Offline rogerandout

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Re: RotoFlow Fuel System
« Reply #6 on: August 01, 2012, 06:45:28 AM »
I am not sure if I am being a numpty  ;D most likely. I don't understand what you are getting at. What happens to your Clunk when your model is nose down? Depending if it is a sudden dive or just nose down. Nose down the clunk will sink to the lowest point in the tank and held at a point by the tension of the tubing

The Rotoflow Clunk swivels on the brass tube. This is one of the benefits. Rather than thrashing around in the fuel potentially causing bubbles -  The RotoFlow Clunk follows the fuel on a swivel action.
yes i see that the clunk swivels but does it also slide up and down thus following the fuel??

Offline The Saint. (Owen)

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Re: RotoFlow Fuel System
« Reply #7 on: August 01, 2012, 08:37:44 AM »
yes i see that the clunk swivels but does it also slide up and down thus following the fuel??

The answer to that is 'no' and I very much doubt that a clunk will either because the force of acceleration will keep it to the rear of the tank along with the fuel.
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Offline itsme

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Re: RotoFlow Fuel System
« Reply #8 on: August 01, 2012, 08:45:54 AM »
Its a very clever idea, but as the old clunk still works fine for me, I wont be putting my hand in my pocket. As said, it may be the latest thing for the aerobatic guys. For myself, the only advantage would be no hardening of the tube inside, and I dont get that now I only fly petrol.


Offline krazy

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Re: RotoFlow Fuel System
« Reply #9 on: August 01, 2012, 11:54:40 AM »
Looks interesting, but the only real issue I've ever had on a normal clunk type fuel tank is eventually the brass tubes fracture/decay or whatever happens to them in glow fuel.
I can't see this helping much there.

Offline purercradio

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Re: RotoFlow Fuel System
« Reply #10 on: August 01, 2012, 15:36:34 PM »
Ok I got it (blinded by flashbulb  ;D) no the Clunk does not move up and down the brass tube. it is held in place toward the back of the tank and cannot come in contact with the tank wall - the clunk only swivels on the brass tube

The Rotoflow will supply fuel to the engine in a straight desent for 25 seconds. A standard clunk tank is lucky to get 15-18 seconds. There is more reserve built into the Rotoflow.

Most desents are 3-5 seconds before pull out is necessary with the throttle closed. Clunk style tanks do not draw fuel from the front of the tank but rather only the rear just like the Rotoflow. The clunk hose will not allow the clunk to travel foward and if it does it is a certain stall on the preceeding take off.

Here comes the Marketing gumf  :co - RotoFlow say they have had 4 years of extensive testing to prove the Rotoflow performance. :ev

I absolutely take the point - if your current setup works just fine - why change it.

Sure these things are not cheap and cheerful tank but definitely has some benefits
as I said especially for the aerobatic boys

With regard to the degradation of the brass tube - good question  - I don't know I will find out and post back here

I only posted the review purely for interest purposes only and because Wiz told me too ^-^ - it is something different and its alway good to have choice

Keep the questions coming :af
« Last Edit: August 01, 2012, 15:49:10 PM by purercradio »

Offline Wiz

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Re: RotoFlow Fuel System
« Reply #11 on: August 01, 2012, 15:42:08 PM »
..Just a bit of support here for Mike - I did indeed ask him to post a description of the Rotoflow tank here because I thought it might be of interest as a new product on the market, not necessarily because I thought you needed one so this whole negativity thing is a bit misplaced if you ask me.

Just my £0.02 you understand.
The buck stops here.

Offline itsme

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Re: RotoFlow Fuel System
« Reply #12 on: August 01, 2012, 15:59:38 PM »
I thought it was a discussion of the pros and cons- it seems a very good idea if you are an aerobatic contest pilot, not so essential to a sport flyer.
.00002p added.....

Offline purercradio

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Re: RotoFlow Fuel System
« Reply #13 on: August 01, 2012, 16:12:51 PM »
 ;)


Offline warbird_fanatic

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Re: RotoFlow Fuel System
« Reply #14 on: August 01, 2012, 16:31:51 PM »
I've been using a better self designed idea for years, IV drip bladder inside a tank with the exhaust outlet feediing pressure into the tank vessel, thus forcing the fuel out of the bladder into the engine, to draw in fuel you just connect the carb tube to your glow fuel bottle and suck the exhaust pressure pipe, works pretty much like the human diaphragm! Don't know if its been done before?

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Offline Sizzling

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Re: RotoFlow Fuel System
« Reply #15 on: August 01, 2012, 17:01:24 PM »
I think it's a good idea especially if space is tight and you cannot use a header tank. I believe the dive query is a red herring as I have never seen a normal clunk that bends forward, I would say a clunk that bent forward would risk kinking the clunk line. Therefor I cannot see any disadvantage in this system.

I will however say that if room allows then IMO the header tank setup is a better solution. As the header tank should remain full at least until the master tank is empty then there is much lower chance of suffering from fuel frothing or the clunk that feeds the engine being able to come out of the fuel.

Offline warbird_fanatic

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Re: RotoFlow Fuel System
« Reply #16 on: August 01, 2012, 17:17:32 PM »
An idea that could aid them even more would be to make the feed pipe a rotary telescopic design, if the do this because of my idea, I want royalties  ;)
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Offline Arceenut

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Re: RotoFlow Fuel System
« Reply #17 on: August 01, 2012, 17:44:59 PM »
The claim of 4 years of testing ?  Was it done on one individual unit?  I have trouble believing the seals between the rotating part and the tube would remain leak free for that length of time?  Then there would be air leaking into the fuel flow whenever the tank got below the tube.
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Offline warbird_fanatic

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Re: RotoFlow Fuel System
« Reply #18 on: August 01, 2012, 18:07:14 PM »
I agree that it's not the tightest looking sealed device, I can see why it's made of brass but 4 years is a bit too extreme to believe, considering there are plenty of grandads on here that have made better devices for their own benefit and not for profit!
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Offline purercradio

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Re: RotoFlow Fuel System
« Reply #19 on: August 01, 2012, 23:09:19 PM »
Looks interesting, but the only real issue I've ever had on a normal clunk type fuel tank is eventually the brass tubes fracture/decay or whatever happens to them in glow fuel.
I can't see this helping much there.

I promised to answer the above as I am not a Metallurgist I can only repeat what I was told.

The degrading of the brass interal tubes. Rotoflow peeps say they have a 3/4 filled a Rotoflow Tank with 15% nitro glow fuel and have set it aside for a period of two years to see the corrosive action to the brass tubing. What they have found is the brass tubing recieves a surface layer of corrosion that actually stops additional corrosion from happening. Much the same as aluminum does. The internal working area of the rotary pick up which houses the seals stays clean and unaffected and Rotoflow will continue to deliver perfect performance for many years to come."

In response to   "no problems of brittle inner tubing due to using Petrol."

I agree by using Petrol there is no hardening of the fuel line inside the tank.

Having said that  most flyers I think would also agree the other advantages are also important like a stopper that will never leak and potentially wreck the inside of the model, quicker throttle response, strength of the tank, zero maintence, and the total elimination of internal air leaks,

Let me say again if your current system works - no need to spend your hard earned cash :af

Thanks for the great discussion and feedback.
« Last Edit: August 01, 2012, 23:29:00 PM by purercradio »

Offline mchillerman

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Re: RotoFlow Fuel System
« Reply #20 on: February 28, 2013, 18:58:06 PM »
Hi All

I have now been using these tanks for two years, having imported them myself from the USA for personal use.

May I start by saying, "not one fuel failure in two years on these tanks" wish I could say the same of some other manufacturers tanks.

I have them fitted to aerobatics and warbirds, and I am 100% behind these tanks, they do just what it says on the tin.

Martin

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Re: RotoFlow Fuel System
« Reply #21 on: March 01, 2013, 08:24:25 AM »
in the past i had need of a specific tank for a tight location across wise in a rotary engined cowl, after much head scratching the perfect tank appeared at a car boot sale attached to an old chain saw, i don't know what the pipe is they use for their clunks (just thing of the positions a chain saw gets used in) but it flexes enough to bend into every corner of the tank even doubling forward without kinking, hmm i feel a t,internet search coming on.

cj
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Online wunwinglow

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Re: RotoFlow Fuel System
« Reply #22 on: March 01, 2013, 15:13:07 PM »
Is there a felt pad in the clunk to overcome foaming problems particularly with petrol, as all my petrol models use the big clunk with a felt 'wrap'.


 

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