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HelicopterMain Discussion › Need Advice - My fist unintentional Auto
04-29-2004 06:17 PM  13 years agoPost 1
Rob Harrison

rrNovice

Mobile, Al. U.S.A

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Boy I got lucky yesterday. After re-building my Raptor V1 after trying nose-in, I went flying yesterday afternoon. I am still in the learning stage, and decided to stick with basic hovering and figure 8's before trying nose-in again.

Anyway, after flying about 5 minutes, by rpm started going up and down (lean then rich, and back and forth for about 30 seconds), I could see my fuel tank was only about 25% empty, then the engine died. Great I thought, the heli was about 30 feet away from me and about 15 feet up. I have watched the more experienced guys at my field doing autos and realized I was about to try one. By the grace of God, I brought her down with no damage

I took her back to the bench and installed a new glow plug (I had had the old glow plug in the enging for about 3-4 months so I figured that was the problem.

Right before I put the canopy back on I noticed that my header tank was empty but my main fuel tank was only 25% empty.

(by the way - when I was doing the crash repairs mentioned earlier I went ahead and changed out all of my fuel tubing {including clunk lines in header & main tank} and cleaned the fuel filters)

I used the Hayes black clunk line for the header and main tanks.

I finally figured out that the clunk line in the main tank had fallen out. I removed the tank, checked the clunk line for splits, tears, etc... and couldn't find any. Re-installed the clunk line (with an extra piece of fuel tubing over the main tubing where it connects to the nipple - as extra insurance for it not to come off again), put the fuel tank back in and went up again.

As luck would have it the exact same thing happend again .

The clunk line is brand new (from Rick;'s) and I cannot figure out what is causing it to come off during flight. When the fuel pickup is out of the tank I can pull on the clunk line and it will not come off of the nipple. It slides a little bit, but I really have to pull hard to get it to come off.

Have y'all had experiences like this? If so, please let me know how you corrected the problem. (BTW, the fuel tank is new also).

Robert Harrison Mobile, Al.Proud Member of A.C.M.A.

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04-29-2004 06:52 PM  13 years agoPost 2
rjflyer

rrApprentice

Valley City, Ohio (Cleveland)

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Hi, I had a similar problem where the line just cracked and the clunk just fell off, right after I replaced the lines for the coming season. I bought some fuel tubing spring clamps and they hold secure, it won't happen again.

Rick...God,I love this hobby!

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04-29-2004 06:53 PM  13 years agoPost 3
comet

rrVeteran

Neuilly sur Seine, Fr

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didn't you set the exhaust pressurizing hose on the fuel pick-up line?

or isn't your fueling method that is a little too "powerfull"

Regards

VT "slow&low"

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04-29-2004 07:04 PM  13 years agoPost 4
Rob Harrison

rrNovice

Mobile, Al. U.S.A

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Yes, the fuel clunk was still on the line, the clunk line had came off of the nipple where the fuel pickup assembly enters the tank.

I may try the spring clips - thanks rjflyer

Robert Harrison Mobile, Al.Proud Member of A.C.M.A.

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04-29-2004 10:56 PM  13 years agoPost 5
Chavalo

rrApprentice

Mexico City

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On your second engine loss, did you manage to auto again??? Nice way to practice autos!

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04-29-2004 11:40 PM  13 years agoPost 6
G.Man

rrProfessor

Bristol

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Use small cable ties to secure the clunk line to the clunk and the nipple


Don't Email me as I wont reply - PM Only (spam countermeasures)

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04-30-2004 05:39 PM  13 years agoPost 7
Rob Harrison

rrNovice

Mobile, Al. U.S.A

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Yes, two auto's in one day. I guess I need to start practicing them for
real.

Thanks for everyone's input/advice.

Robert Harrison Mobile, Al.Proud Member of A.C.M.A.

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04-30-2004 06:13 PM  13 years agoPost 8
Hughes500Pilot

rrKey Veteran

Anaheim, CA

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Click below for what your looking for. -Steve

Click Here

Or Click Here

Or Here

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HelicopterMain Discussion › Need Advice - My fist unintentional Auto
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