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HomeAircraftHelicopterMain Discussion › Could it be the OS Bubbleless Clunk?
06-02-2009 05:27 PM  9 years agoPost 21
USNAviationjay

rrElite Veteran

Houston Tx USA

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I always use both a header and a BL Clunk.. I was always told to run them as a pair.
or just run an FM with no header.

never had a flame out except before I used them..
/knock on wood.

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06-02-2009 05:29 PM  9 years agoPost 22
inkspot1967

rrProfessor

Cranston Ri

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header tanks are for pussies bud......

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06-02-2009 05:36 PM  9 years agoPost 23
USNAviationjay

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Houston Tx USA

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ya ya so are flybars =D or so Ive heard =D

You coming in this weekend for the Houston Fun Fly like last year?

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06-02-2009 05:40 PM  9 years agoPost 24
inkspot1967

rrProfessor

Cranston Ri

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no im not going to make it this year

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06-02-2009 11:07 PM  9 years agoPost 25
Shawn Behrens

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DEEP IN THE BOG

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Shank
I hope you were not using the os bubbless clunk in the outer position on the fuel tank. The outer hole position for main fuel draw is only to be used if you are running a fuel magnet, otherwise you are guaranteed issues (leaning and starvation).

To simplify matters I like to run a fuel magnet in the outer tank hole and run no header tank (on hz no pump).

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06-02-2009 11:19 PM  9 years agoPost 26
Mike Fortin

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USA

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Firs off you are way to rich on your high needle. It's surprising that the motor even stays running.

You should be more around 1 1/2 give or a take some clicks.

Also, if you continue to be so conservative with your motor your going to do more harm to your motor than good.

Have Rotors, Will Fly!

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06-02-2009 11:20 PM  9 years agoPost 27
ShankBones

rrApprentice

La Quinta, CA USA

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sbmon Shank
To simplify matters I like to run a fuel magnet in the outer tank hole and run no header tank (on hz no pump).
No, I was using the center hole outlet for the BB Clunk.

What I don't understand is, why the outer hole if you use the fuel magnet?

"Whats Right is Right and Whats Wrong is Not Flying"

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06-04-2009 05:17 PM  9 years agoPost 28
ShankBones

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La Quinta, CA USA

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Update and Problem Solved
Hey guys, first I want to say thanks to all that gave me good advise.

I got "Honken Betsy" back in the air this morning and she now sings like the Fat Lady in the Opera.

Well, I'm trying to give you the song and dance to prepare you for the truth.

Turns out it was never the OS clunk like everyone was trying to tell me, but it was a carb adjusting problem.

Thanks to "Mchammer" for cueing me into the carb issue. I was way too fat on the High needle but.......I made a startling discovery that my Mid needle was a few clicks out from being closed all the way..... This totally explained my bogging problem.

Guys, I'm so Freaken embarrassed and don't really know how I had the Mid needle closed like that. I must have tinkered with it when I had the engine out to install the BB clunk..

My bad, and sorry if I sent everyone on a wild goose chase.

"Honesty is the best policy" I always say.

But the good news is that Betsy is back, better and smoother than every before, and now I can go back to having fun again.

I tried the "690 V2 3D Blades" for the first time, they have a crisp snap to them compared to the Radix 690's.

I will be closing this thread soon before I get my A$$ pick'd on.

Thanks again fellas,

ShankBones

"Whats Right is Right and Whats Wrong is Not Flying"

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06-04-2009 05:36 PM  9 years agoPost 29
USNAviationjay

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Houston Tx USA

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hey that's all that matters is you figured it out.

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06-04-2009 05:52 PM  9 years agoPost 30
red_z06

rrProfessor

Dumont, NJ

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I will be closing this thread soon before I get my A$$ pick'd on.
I doubt that will happen as we all were newbies at one point of the learning curve. It might be a good idea to leave it active as someone else might find it useful.

www.JustinJee.com

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06-04-2009 06:11 PM  9 years agoPost 31
ShankBones

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La Quinta, CA USA

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red_z06
I will be closing this thread soon before I get my A$$ pick'd on.
I doubt that will happen as we all were newbies at one point of the learning curve. It might be a good idea to leave it active as someone else might find it useful.
The problem is that I'm an old dog and have been RC'n planks and helis since the mid 80's

I should have known better.

But would be a good idea, if someone could find it useful.

"Whats Right is Right and Whats Wrong is Not Flying"

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06-04-2009 07:15 PM  9 years agoPost 32
soloflyt

rrNovice

San Dimas, CA - United States

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I've had the same problem, installed OS bubbleless clunk and never get a consistent tuning. Then ended up bogging when i was inverted, flipped the heli back but damaged the boom. I put back the align clunk and it was fine after that. Maybe I got a defective one, but that is also the only thing i changed that caused my tuning issues.

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06-04-2009 07:50 PM  9 years agoPost 33
ShankBones

rrApprentice

La Quinta, CA USA

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soloflyt, you took the story right out of my mouth.

That's exactly how it happend, but now I don't want to blame the BB clunk anymore.

Maybe now would be a good time to put the BB clunk back to see if it gives me a piece of mind..........Or, maybe not.

"Whats Right is Right and Whats Wrong is Not Flying"

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06-04-2009 08:37 PM  9 years agoPost 34
red_z06

rrProfessor

Dumont, NJ

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I don't like things that require frequent maintenance.

I had one 700 with BL and the other with FM. The one with BL ran through 50 gal without a single hickup until the con rod on HZ let go.
The FM one started leaning after about 8 gals or so. It appeared clean on outside but a piece broke off from inside and was lodged in the inlet hole of the FM hub. Needless to say the 2nd 700 got a new BL clunk.

BTW, I always fill up as soon as I set it back down on the table after a flight to purge the exhaust fume from the tank.

www.JustinJee.com

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06-04-2009 08:53 PM  9 years agoPost 35
soloflyt

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San Dimas, CA - United States

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Shank, i took mine off. It could be or could be not but my heli fly's fine without it. With it, i experienced some troubles so its out of my heli. However my friend has been flying his 600 and 700 with it and its been fine. Maybe i did get a defective one. I don't know. I figured the stock align works fine, heavy enough to pickup the fuel so im gonna fly with it.

One thing i notice with the bl clunk is when the fuel is lower than the clunk you start getting a lot of tiny bubbles. Whereas with the stock align the hole is at the bottom only, so no tiny bubbles are generated bcoz part of the clunk is sucking air.

I think the bl clunk was mainly for planks ? that has bigger tanks and more wiggle room.. but thats just me.

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06-04-2009 11:06 PM  9 years agoPost 36
red_z06

rrProfessor

Dumont, NJ

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Did you shorten the fuel tubing ( about 1/4" ) when using the BL clunk? Otherwise it might not move around freely. Did you use the thin flexible fuel line compared to what is used outside the tank?

www.JustinJee.com

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06-05-2009 07:49 AM  9 years agoPost 37
mchammer

rrElite Veteran

California,USA

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Guys, I'm so Freaken embarrassed and don't really know how I had the Mid needle closed like that. I must have tinkered with it when I had the engine out to install the BB clunk..
I have had needles mysteriously move on their own at times.
Our little 2 stroke, single cylinder r/c engines create alot of vibration even when everything is running smooth as can possibly be. A one cylinder engine is inherrantly unstable. IMHO the needles can creep on you if the carb needle detent clips are not tight enough.

I liked the way supertiger engines had a brass nut that you could tighten the main needle tension with. They would never move around on you.

It is a good idea to index your needles so you can tell if they have moved. Quick UK makes some cool anodised needle ends that make it easy to see if they are positioned correctly.

Peace Through Superior Firepower!!!

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06-05-2009 07:41 PM  9 years agoPost 38
ShankBones

rrApprentice

La Quinta, CA USA

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mchammer
IMHO the needles can creep on you if the carb needle detent clips are not tight enough.
Come to think of it, the detent clip was very loose, little to no click feel to it.

I'm going to take the needle out and bend the clip in so it rides on the notches.

"Whats Right is Right and Whats Wrong is Not Flying"

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06-05-2009 08:27 PM  9 years agoPost 39
EVO76

rrApprentice

New York , U.S.A.

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Shankbones...glad to see ya got her figured out. the mention of the detents made me post this, try adding a small piece of fuel line to the needle, and the clip will stay on tighter. just my 2 cents...

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HomeAircraftHelicopterMain Discussion › Could it be the OS Bubbleless Clunk?
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