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HomeAircraftHelicopterMain Discussion › Could it be the OS Bubbleless Clunk?
06-02-2009 12:27 AM  9 years agoPost 1
ShankBones

rrApprentice

La Quinta, CA USA

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"This post has been edited to better explain my situation"

My T700 has crash landed for the second time two weekends in a row.
on the 1st fueled tank of each crash. Coming out of a hard flip using aggressive collective, engine bogged and could not recover governed head-speed (Align Gov) in time and lost elevation.

This is not my first rodeo guys, I have done this and many other maneuvers many times harder, and has never bogged the Align 91H like this before.

The only thing I have done different, I installed a OS bubbles clunk and larger blue silicone fuel line in the tank just before the first crash landing.

Fuel system has been checked for leaks.

Another very important observation. This may not mean anything but, since I installed the bubbleless clunk I noticed the way the fuel would be restricted when fueling tank in and out, it is very slow fueling. Not like before, it would fuel fast.

So my theory is that the bubbleless clunk is restricting and not giving the fuel demand when needed. Just my theory.

Any experience with this? or help would be appreciated.

ShankBones

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

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06-02-2009 12:37 AM  9 years agoPost 2
USNAviationjay

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Houston Tx USA

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There's the problem this isnt a rodeo!!!!

I highly doubt it.
its one of the most popular clunks other than the FM out there.

I'm running 3 of them with no issues what so ever.
I think you have an air leak somewhere.. or the line you used sucks.

I use only hayes black med clunkline and it rocks.

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06-02-2009 12:51 AM  9 years agoPost 3
duceduc

rrKey Veteran

Saitama-Ken, Japan

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I use the OS clunk and I have had no issue aswell. I leave the rubber out of it since it breaks after awhile.

Duc S
Do It! Do It!™
AMA:REVOMIX
RCK:24005615-01

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06-02-2009 12:51 AM  9 years agoPost 4
kris L

rrApprentice

NY

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"The only thing I have done different was installed a OS bubbles clunk and large ID fuel line in the tank just before the first crash landing. The original clunk with fuel line had fell off in the tank. It was time anyway."

I have never heard/seen anyone use large ID fuel line inside a tank. Did the fuel line that fell off cause the first crash?

"I have had a few cases of fuel through it, and piston, ring, sleeve twice from lean-outs in the past."

I am not sure what you are saying here but I run the bubbless clunk on my T700 with no problems. Also how full is the tank when it leans out? You say "1st fueled tank" but is it after you have flown the tank half way down? a third of the way down? is it full?

-Kris

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06-02-2009 12:56 AM  9 years agoPost 5
LONEWOLF2440

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MYRTLE BEACH S.C

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Mine has been good one way to find out change the clunk

MIKADO LOGO 600 TREX 550

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06-02-2009 01:00 AM  9 years agoPost 6
airdodger

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Johnston USA

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Whatever the reason for the slow fueling, I would get to the bottom of it. That could very well be your problem. What caused the lean outs in the past?

Chris

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06-02-2009 01:04 AM  9 years agoPost 7
Melon

rrApprentice

California

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What pipe are you using? The Align pipe makes your engine go lean on high g manuvers because of the nipple location.

Also i'd suggest to replace all of the fuel tubing if you havent already.

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06-02-2009 01:18 AM  9 years agoPost 8
Gary Lkn

rrNovice

northeast

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ShankBones ... The line inside the tank is not normal tubing , you cant use standard fuel tubing ... it wont follow the fuel through menauvers and will find itself going in and out of the fuel as the level lowers .

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06-02-2009 01:34 AM  9 years agoPost 9
ShankBones

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La Quinta, CA USA

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The only thing I have done different was installed a OS bubbles clunk and large ID fuel line in the tank just before the first crash landing. The original clunk with fuel line had fell off in the tank. It was time anyway.

I have had a few cases of fuel through it, and piston, ring, sleeve twice from lean-outs in the past.
Sorry guys don't mean to sound like a Gooffenoff and confuse anyone, maybe some things should not be said and left out for detail.

What I'm trying to say is that I had other issues in the past and repaired and was running fine.

Prior repairs are not related to the bogging that cause the last two crash landings that I had installed the OS cluck within the 1st tank flight. Second crash, 1st flight again. Both doing hard flips with aggressive collective.

I have now removed the bubbleless clunk and replaced with the old one, I can now fill the tank rapidly like it used too. (not to say my problem is solved, I don't have the heli fixed for flight)

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

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06-02-2009 01:44 AM  9 years agoPost 10
Yug

rrMaster

UK. Herts

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The rate at which you can refuel is irrelevant to the issue in hand due to the nature of the bubbleless clunk or even the ID of the clunk tubing. During flight the rate of fuel flow is very slow and the pressure differentials are well balanced. However, refuelling presents great differntials, but realistically, these can obviously be ignored.
Have you pressure tested your system ?

Vegetable rights and Peace

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06-02-2009 01:46 AM  9 years agoPost 11
LONEWOLF2440

rrElite Veteran

MYRTLE BEACH S.C

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mine fills slower than the stock design ya got to remember it has little holes compared to the the stock one hope it fixs your problem so keep us posted. I had a friend who crashed 2 times in a row because of a faulty 2in1

MIKADO LOGO 600 TREX 550

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06-02-2009 01:47 AM  9 years agoPost 12
airdodger

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Johnston USA

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As already stated, Don't forget to use a more flexible fuel line than the regular fuel tubing, in the tank. If you rotate the tank the clunk should follow to all corners upright and upside down.

Chris

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06-02-2009 01:48 AM  9 years agoPost 13
ShankBones

rrApprentice

La Quinta, CA USA

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Gary Lkn
ShankBones ... The line inside the tank is not normal tubing , you cant use standard fuel tubing ... it wont follow the fuel through menauvers and will find itself going in and out of the fuel as the level lowers .
I understand, but I'm using the same type of fuel line that I had always used before. Maybe the combination with my existing type of fuel line and the OS cluck are not work good together.

It is not the black Hayes line, I didn't use the Hayes line because on my buddies T700 the new black Hayes line would rip/break easily.(maybe a bad batch)
Yug
Have you pressure tested your system ?
I never knew it even existed, but show me how and I'll find out.

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

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06-02-2009 01:53 AM  9 years agoPost 14
ShankBones

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La Quinta, CA USA

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airdodger
As already stated, Don't forget to use a more flexible fuel line than the regular fuel tubing, in the tank. If you rotate the tank the clunk should follow to all corners upright and upside down.
All is fine and free of binding with the clunk.

To add, I have always had a header tank.

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

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06-02-2009 01:57 AM  9 years agoPost 15
airdodger

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Johnston USA

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Yug if there is a restriction in the fuel system it does not matter how much pressure is present. It goes without saying if fuel line and clunk is all you changed and it was right before. The flexible line is important don't disregard it.

Chris

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06-02-2009 05:00 AM  9 years agoPost 16
Dwntyme

rrApprentice

U.S.A.

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Is your T700 muffler pressure or do you use a pump?
The reason I ask is that the pump may have issues. Or if pressure from muffler maybe its running rich enough on first flight to cause oil to fill the pipe and block off the pressure line when in the flip. Just a thought....

Love a Twitchy Heli.... :) and Remmington Model 700

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06-02-2009 06:13 AM  9 years agoPost 17
Fastsrt

rrVeteran

Lebanon, Tn

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never bogged the Align 91H
Dwntyme, It's just like the pump on your OS fiddy. It's pipe pressure, Align doesn't offer a pump motor.

Gotta rag him (dwntyme), he's our entertainment!

I run the OS clunk on 2 of my heli's and haven't had a problem yet in 1.5 years. I probably just jinxed myself!

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06-02-2009 06:39 AM  9 years agoPost 18
mchammer

rrElite Veteran

California,USA

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ShankBones,

I would get rid of the os clunk. you dont need it if you are running a header tank anyway. I got tired of having to auto all of the time on my 700 due to crazy maneuvers causing fuel starvation. I finaly put a header tank on it and its all good now. I am using the stock align clunk and standard diameter fuel tubing. The thicker tubing that you use in the tank the harder it is for it to follow the fuel. It is too stiff. Use a flimsy tube and it will work better. The medium or small aerotrend blue fuel line is what I use in the tank.

Also make sure the end of the pickup tube in your header tank is right in the middle of the header tank.

If you are getting alot of air in your header tank at the end of a flight it is a pretty good sign that the clunk in the main tank isnt staying in the fuel.

Peace Through Superior Firepower!!!

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06-02-2009 09:22 AM  9 years agoPost 19
ShankBones

rrApprentice

La Quinta, CA USA

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Well guys, thanks for all the great suggestions.

Like Mchammer had suggested. Since I am using a header tank, I've removed the OS clunk and went back to the stock Align clunk for now. I also made sure the new fuel line flex's free inside the main tank.

Mchammer PM'd me with a suggestion to ck if maybe the engine is running too rich now since the break-in and setting of the piston, ring, sleeve (PRS)replacement.

The PRS has been breaking in for about a gallon prior to these two accidents now, and may need to lean it in some. This could explain the reason for the bogging and not able to deliver the power needed.

Now that I think about it, the engine has been on the cool side by doing the finger test on the back-plate and plenty of smoke too(Magnum 30%).

I know that mileage may vary, but at the moment I'm about 2 1/8 to 2 1/4 turns out on the high needle.

I will be getting this bird back in the air by Friday morning. I'll do the fuel adjustments first and put the heli to the hard test and get the back plate warmer.

I need to be a good sport and give the OS Clunk a chance, but after I address the bogging issue that got me in trouble first. I'm sure it serves a great purpose.

Thanks again for all your suggestions, and I will be posting the results by this weekend.

ShankBones

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

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06-02-2009 05:24 PM  9 years agoPost 20
inkspot1967

rrProfessor

Cranston Ri

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I'm about 2 1/8 to 2 1/4 turns out on the high needle.
way to rich after breakin

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HomeAircraftHelicopterMain Discussion › Could it be the OS Bubbleless Clunk?
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