suitcase

My Feedback: (1)

I'm still having a problem with my G26 dieing on me after inverted flight. I think the problem is lack of fuel to the carb. The clunk tube is the same I have from the tank to the carb and I think it may be too stiff. What can I use that's not so stiff? If I try a slow roll or anything that keeps the plane inverted for just a few seconds it will quit running.

Tired Old Man

My Feedback: (1)

Black neoprene stays pretty limber over long periods of time.

RTK

My Feedback: (1)

If it is dieing after just a couple of seconds it should not be from fuel starvation. Try pulling off the line while running and see how long they actually run, it might surprise you.

karolh

I don't think that the clunk is the culprit as gas engines due to their fuel economy can run for quite awhile on the gas that is in the fuel line and carb.

I think you should look elsewhere for the solution to your problem. Maybe a needle needs a bit of tweaking or something. Ralph our Zenoah guru always chimes in here to help.

Karol

suitcase

My Feedback: (1)

The reason I posted is that it died on me after a long inverted to straight down dive. After it leveled out, it died and I overshot the runway into an old fence covered with honey suckel vines. Lucky no damage was done. I pulled the tank out today and the clunk was at the front of the tank still, I suppose due to the sudden stop into the fence. I changed the clunk tube to a smaller diameter tube but it still won't fall to the front of the tank in a downward attitude. I'll try what you say about the test of how long it will run after it loses it's fuel though. I'm still prone to blame it on the fuel delivery system.

Rcpilot

My Feedback: (78)

You don't want your clunk falling to the front of the tank on a dive. It'll get stuck there and then you'll deadstick when you pull up level or vertical.

If your diving long enough to suck all the fuel out of the line and out of the carb--you must be flying 1500' high.

Just put black neoprene tubing on it, as SilverSurfer suggested.

waynem

My Feedback: (58)

Hi Suitcase, You want the clunk to stay at the back of the tank, but fall freely from top to bottom. I try to get mine about 1/4" from touching the back. I also use the black neoprene line. Wayne M.

hubbajer

My Feedback: (7)

I think Karolh is right on. I have had several gassers that did the same thing and every time it was carb adjustments that cured it.

suitcase

My Feedback: (1)

I'll try to find some black neoprene and replace the existing tubing. I've gone so far as to change the stock carb to the G23 carb trying to cure the problem but to no avail. The clunk is now about 1/4" from the back of the tank and falls freely from top to bottom. However, when pointed down, it will be out of the gas once the level drops to about 2/3rd of a tank. The last two times out, dead sticks were the last flight on my Big Boy. It's getting a little old, if you get my drift.[:@]

iflyj3

My Feedback: (7)

When the plane is headed down, you can't go slow enough to cause the fuel to go to the front of the tank. The plane descends faster than the fuel, so the fuel stays at the rear of the tank.

chuck l

My Feedback: (17)

Beware of neoprene hose, I ripped out the landing on the second flight of a Wildhare Edge about two weeks ago. The neoprene slid off its pipe inside the tank. If you use the neoprene make sure you solder barbs on the pipe that the neoprene goes on, plus use a wire tie to make sure it stays on.

rcbill

My Feedback: (1)

Suitcase, I use neoprene inside the tank with a stiffener so the clunk stays free but to the rear of the tank just like Wayne and the others have mentioned. I use tygon on the outside of the tank for visual purposes. I barb everything and use small wire ties on all fittings. It works very well for me. Zero problems with leaks or lines falling off etc.....[8D]....Bill Knock on Wood....

Capt Jim

My Feedback: (168)

I know you want to believe it is the clunk...but listen to this. My G-26 ran great, and reliably in almost every attitude...but RPMs would sag immediately when I went into a (left wing side down) knife edge attitude. It never quit, but I didn't hold it in that position for very long either...and it sure didn't give me much confidence that it would continue to run. I was baffled as to what may be the cause. Other than that little glitch, it ran perfectly. Because of some non-related work on the plane, I had to completely retune my carb. Now, with the carb PROPERLY tuned, the sagging in knife edge has disappeared. Everything else remained the same...same plane...same fuel tank, etc etc. My suspicion is that due to improper tuning, it was becoming ever so slightly lean in knife edge, and the correct retuning of the carb solved the problem. I hope this clue works for you too.
jim