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HomeAircraftHelicopterMain Discussion › header tank or fuel magnet?
01-14-2009 04:34 PM  9 years agoPost 21
Mike Fortin

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USA

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This comes down to personal preferance ultimetly.

I haven't run a header tank on any machine in 3 1/2 years and HAVE used fuel magnets on everything since using only muffler pressurized systems.

I have been running a fuel magnet since August in one of my main 700 and just replaced the magnet last weekend. I had at least 12 gallons on through that magnet.

The OS Bubbless clunk is NOT a fuel magnet and doesn't retain fuel. The best way to explain this is by holding a bunch of rocks in one hand and a sponge in the other...poor water on both and tell me which retains more water.

Header tanks work but add weight and stick out like a sore thumb on the side of a helicopter and you still end up replacing clunk lines on the header tanks every few months.

For the performance that the OMI Fuel Magnet provide there is simply nothing better to use on a 90 size machine. IMHO this is a must have item for any 90.

Have Rotors, Will Fly!

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01-14-2009 04:56 PM  9 years agoPost 22
USNAviationjay

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Houston Tx USA

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I don't understand why that is a better idea.. putting a foam pickup in ones fuel tank is not generally considered a good thing in any other motor sport..

racing bikes, and cars, go carts etc for years and never have i heard of a fuel pickup made of foam because it "retains" fuel like a sponge.

The bubbleless clunk takes ever bit of fuel out of my tank and that's all that matters as well as preventing bubbles from entering the fuel lines.

Help me understand why you want this extra complication of a clunk you have to keep fuel on at all times and watch closely for deterioration at the risk of the foam coming apart and clogging the system.

I personally consciously chose the OS bubbleless over the fuel magnet as the reason for having the FM really doesn't sound all that more appealing and on top of that transporting and storing a heli that was fueled ( in an apartment and in my car where it can leak) does not sound very appealing.

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01-14-2009 05:19 PM  9 years agoPost 23
Avropilot

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Murfreesboro, Tennessee

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Fuel magnet and nothing else. BTW in a race car the whole tank is foam. Does it deteriorate and clog the fuel line? Mine never did.

I dont care what anybody else uses. Doesn't hurt my feelings at all. But the fuel magnet is the best. The only people who dont think so are the people who haven't tried them. But I guarantee you the people that used them have used a header tank in the past.

Things that make you go hmmmm

BTW I just replaced the foam on all of mine. The magnets lasted a year on muffler pressure systems and countless gallons.

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01-14-2009 05:36 PM  9 years agoPost 24
Mike Fortin

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USA

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I don't think you will find anyone flying competitivly or on a "pro" level that doesn't run a Fuel Magnet.

Since they, I and we are trying to squeeze the most performance out of our models the.. Fuel Magnet is by far the best option and has been for some time.

Have Rotors, Will Fly!

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01-14-2009 05:38 PM  9 years agoPost 25
USNAviationjay

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Houston Tx USA

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well then explain why it works and why its better... I havent seen any nitros around my area with anything but regular clunks or OS Bubbleless.

and was warned off of FMs because of having to keep it fueled and the possibility of the foam coming apart.

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01-14-2009 05:47 PM  9 years agoPost 26
Mike Fortin

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USA

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A bubbleless clunk is NOT the equivlent of a Fuel Magnet, it's just a clunk to keep the fuel from foaming.

Take a sponge in one hand and a bunch of marbles in another, run some water over them and tell me which one is going to retain the most liquid?

The Fuel Magnet RETAINS fuel, by loading the sponge with fuel it can never suck air and never go lean.

It will litterally run every drop of fuel out of your tank, it's so effective that at the end of your fuel the motor won't go lean....it will just shut off.

You don't want to run out all your fuel you say....luckily all modern radios have TIMERS so that you know when your getting close to the end of your flight.

You do need to care for the Fuel Magnets by refueling after your flights, this removes the hot gasses from the tank and will keep your sponge wet.

With this care your magnet should last for months on end.

Have Rotors, Will Fly!

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01-14-2009 06:02 PM  9 years agoPost 27
merlin3

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dayton, ohio

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do you see a lot of cars that do piroflips? I don't see that very often and if I do the cars aren't still running and the car is toast afterwards. Saying a car doesn't use a fuel magnet so why does a helicopter is about the worst comparison I've ever heard.

Justin - Team Horizon, Team Byron
2-700x, Trex 700n, small helis

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01-14-2009 06:07 PM  9 years agoPost 28
Mike Fortin

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USA

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Also, cars have Fuel Pumps to force fuel to the motor so there is really no chance of getting air in your lines.

I should also point out that cars don't fly upside down in an erratic manner.

Have Rotors, Will Fly!

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01-14-2009 06:08 PM  9 years agoPost 29
USNAviationjay

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Houston Tx USA

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Well I dont do piroflips either... in fact my helis rarely go upside down at all.. so it is a pretty darn good comparison to me =P

and FYI trick riding sport bikes is amost as violent to the fuel system and oil system as your pyroflips.. so are trick riding offroad bikes..

And another FYI 10 years of working on Fighters in the USN and they don't use foam on their fuel pick ups either so your little attack is null and void as well.

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01-14-2009 06:11 PM  9 years agoPost 30
3Dx

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Monterrey NL

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01-14-2009 06:16 PM  9 years agoPost 31
Mike Fortin

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USA

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working on Fighters in the USN and they don't use foam on their fuel pick ups either
Then you should know that they have a pretty good fuel delivery system and multiple lines to the engines.

Also, motorcycles do tricks but for the 1.2 seconds that they sustain flight and land UPRIGHT, this will not cause any disruption in the delivery of fuel.

3D Helicopters sustain violent erratic manuvers almost from the time they take off.

If your not flying 3D than stick with a clunk or header tank as it will suit you just fine.

Have Rotors, Will Fly!

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01-14-2009 06:18 PM  9 years agoPost 32
merlin3

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dayton, ohio

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those are far from valid comparisons and still are different from your original car comparison. First of all bikes do not do sustained inverted riding or flipping, they do maybe one or two flips. Also alot of the tanks are usually baffled somehow to help with fuel pickup. And inverted fuel and oil systems are still a far cry from a helicopters needs to be able to constantly draw fuel in all orientations. I don't think you understand the loads that put on a helicopter.

edit - just saw that mike said about the same thing.

Justin - Team Horizon, Team Byron
2-700x, Trex 700n, small helis

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01-14-2009 06:26 PM  9 years agoPost 33
VANHELI

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Omaha,Nebraska

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The OS Bubbless clunk is NOT a fuel magnet and doesn't retain fuel.
I didn't read one post that claimed it was.

I have no reason to try the magnet because I am happy with the bubbleless clunk.
Now I am definately not a PRO but can abuse my heli pretty good and the performance IMO is great.

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01-14-2009 08:20 PM  9 years agoPost 34
Mike Fortin

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USA

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I didn't read one post that claimed it was.
Many people think that they are one in the same, I am just clarifying this. One is a bunch of metal balls that are melted and perforated, the other is a sponge.
I have no reason to try the magnet because I am happy with the bubbleless clunk.
It's personal preference, no problem with that!
Now I am definately not a PRO but can abuse my heli pretty good and the performance IMO is great.
Sounds good, have you tried a Fuel Magnet..maybe it would be better?

Have Rotors, Will Fly!

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01-14-2009 08:26 PM  9 years agoPost 35
USAF Retired

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North, TX

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Header Tank All The Way...Land before Main is Empty!

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01-14-2009 08:53 PM  9 years agoPost 36
Avropilot

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Murfreesboro, Tennessee

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Quote
The OS Bubbless clunk is NOT a fuel magnet and doesn't retain fuel.

I didn't read one post that claimed it was.
And why are they even posting in a thread titled "header tank or fuel magnet"?

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01-14-2009 09:08 PM  9 years agoPost 37
USNAviationjay

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Houston Tx USA

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Because that's what we are using with our Header tank system.. duh =P

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01-14-2009 09:16 PM  9 years agoPost 38
Avropilot

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Murfreesboro, Tennessee

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Because that's what we are using with our Header tank system.. duh =P
We? You got a mouse in your pocket?
but switched to the OS bubbleless clunk and it works great. Oh, and no header tank either.
Duhh

I assume you are one of the ones thats never tried a fuel magnet but have an opinion. Maybe the topic starter should specify people whom have had experience with both.

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01-14-2009 09:40 PM  9 years agoPost 39
USNAviationjay

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Houston Tx USA

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There were a couple of OS BL clunk answers in the thread not just me. 3 of us in fact..

Well like i posted above.. I was warned off of FMs by the locals here.

So I'm using a header in combo with that clunk..

and it works fantastic no flame outs no issues.

I'm not bashing the FM.. In fact I asked questions to why you guys prefer it.

None of the 3D guys at the local club use them.

I asked for information without bias or bashing. You cant just say..
USE FM ITS THE BEST..
tell us why and how it works.. and what makes it better. and that's what I asked above.

I was told over and over by alot of very expereinced local pilots it was not neccessary and would be more of a hassle for me than a boon.

so I used their advice.. now I read here that alot of you highly recommend it and I wanted to know why. Seems to be alot of testosterone happy people around here that like to jump to concussions.

I'm a nitro newbie and am reading and sharing and trying to learn as well.

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01-14-2009 10:10 PM  9 years agoPost 40
VANHELI

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Omaha,Nebraska

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And why are they even posting in a thread titled "header tank or fuel magnet"?
I did not mean to hijack the OP, I was simply stating that I had the same problem and solved it with a different solution.
Fuel magnet and nothing else
In your opinion
Sounds good, have you tried a Fuel Magnet..maybe it would be better?
As I stated in my first post I have not tried one but I dont see how it could be better. My engine receives constant fuel and will suck the tank dry just like a magnet would do. But again, I have not tried one. It may very well be better and I am sure someday I will find out.

Dave

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HomeAircraftHelicopterMain Discussion › header tank or fuel magnet?
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