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HelicopterGasser Model RC HelicoptersOther › Engine cut out in a loop
06-08-2009 04:59 AM  8 years agoPost 1
Toadster25

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Iowa

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Flying my spectra running great as usual but when I pulled a loop the engine cut out and almost died. Didn't seem like it went into failsafe but it was so quick that I may have not noticed a loss of control. Anyone have any ideas why my engine might cut out when inverted. I finished the rest of the fuel without anymore problems but I didn't try anymore loops.

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06-08-2009 05:00 AM  8 years agoPost 2
duceduc

rrKey Veteran

Saitama-Ken, Japan

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Check your clunk line. It maybe too long and it's getting stuck at a corner when it is bouncing around in the main tank.

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

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06-08-2009 05:04 AM  8 years agoPost 3
Toadster25

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Iowa

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That was one thought that I had but then I didn't think the air would have flowed through the fuel tubing and up to the carb that fast. Maybe a few seconds after finishing the loop the air that it picked up might have caused the engine to hesitate.

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06-08-2009 05:38 AM  8 years agoPost 4
pgkevet

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Wales

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...if you recall me reported my predator hanging in a loop? Well the clunk felt OK in there and all other flight was OK... I even tested by holding it upsidedown, nose down etc at idle..everything appeared OK...until the engine died in a 20ft hover (easy auto)..and then air bubbles visible on intake line.

I think the clunk line had a partial tear in it for a while before finally ripping loose. It must have been getting streams of bubbles going up in the loop but (to my suprise) didn't show the signs of a lean runner. It didn't even sound lean on the ground when the bubbles were obvious and visible after the auto.

..wouldn't it be nice to have an easier way into these tanks.. those bungs are a pain..?

pgk

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06-08-2009 06:17 PM  8 years agoPost 5
4 stroke flyer

rrApprentice

Dowagiac,MI

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This is common with gassers to cut out a bit when you do your first loop. Mine does it also. When you go inverted, the air in the prime ball goes out and you actually fill it up completely with gas. I have herd of people flipping the machine upside down and pumping the prime ball before you actually start the machine to get all the air out. I have never done this myself. I just do a nice big loop and this takes care of it.

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06-09-2009 05:55 AM  8 years agoPost 6
Manol

rrApprentice

Hermosillo, Sonora, Mexico

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Following the advices found here, to avoid the engine-dies-in-a-loop syndrome, I use a felt clunk and have richen a bit the high needle, never had any engine issues in loops or other harder maneuvers.

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06-11-2009 04:46 AM  8 years agoPost 7
Toadster25

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Iowa

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I had a chance to look at the pick-up tube and filter that came with my Spectra when I bought it and I think it is okay except the small tubing that used to be very flexable seems very stiff now. I think I should replace it and maybe get a different pickup since some of you have had problems with the thing plugging up. I don't think this had anything to do with my origianal problem because I'm sure I had close to or more than half a tank of fuel when I did the loop.

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06-11-2009 03:33 PM  8 years agoPost 8
rbort

rrProfessor

Franklin, MA - USA

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That rocket science has been figured out
Get the Walbro felt clunk and you can use any tygon tubing in the tank doesn't have to flop all the way around just in the back of the tank up and down is fine.

Then you can say goodbye to first loop hickup.

-=>Raja.

MA 1005 Hanson 280, 4195 flts
Spectra 27 3DMax, 3266 flts
Whiplash V1-2 Hanson 300, 1533 flts
Whiplash V2 Hanson 300, 380 flts

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06-11-2009 04:21 PM  8 years agoPost 9
carpman

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Spain

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No hiccups here on first and subsequent loops with my new gasser thanks to Raja and his felt clunk advice

KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G

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06-11-2009 05:41 PM  8 years agoPost 10
erichevy

rrVeteran

Zevenhoven The Netherlands

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And do not use an inline fuelfilter in the carb feed line.
Also do not fill the gastank with a "T" in the fuel feed line.
And the feltclunck will do the trick as mentioned by others.
My first hikkup did let the engine die and ended up in a veeery tricky autorotation with a Xcell graphite gasser.

Eric.

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06-12-2009 12:20 AM  8 years agoPost 11
TaleGunner

rrElite Veteran

Deer Park WA

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Raja we salute you

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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06-12-2009 04:23 AM  8 years agoPost 12
rbort

rrProfessor

Franklin, MA - USA

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Very funny!
Brought a smile to my face Talegunner and my forehead hurt a little...!

-=>Raja.

MA 1005 Hanson 280, 4195 flts
Spectra 27 3DMax, 3266 flts
Whiplash V1-2 Hanson 300, 1533 flts
Whiplash V2 Hanson 300, 380 flts

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06-12-2009 04:49 AM  8 years agoPost 13
bosshoss

rrVeteran

Chicago, IL

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I disagree with the "any" tygon advice.

The common Dubro tygon sold at LHS stiffens up quickly depending on gas formulation locally.

I have seen the light.

I was at a Jet Rally and saw a vendor selling clear yellow tubing, calling it "Exelon" or something similar. He had test pieces that were 2 seasons old that convinced me to buy 5 feet.

Best stuff I have tried. I wish I bought more. Going to the same Rally hoping to see hime again .

It is the best clunk line tubing I have had , I ended up using it all for clunk lines in my Spectra and my gasser planks.

Why Hover a Yak, when a Heli does it better?

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06-12-2009 09:45 PM  8 years agoPost 14
FloridaHeli

rrVeteran

jacksonville, florida

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bosshoss

I get that yellow tubing from my local lawn mower repair shop. It is made for 2 cycle oil/gas. It still gets stiff in a year or so but is much more reliable.

Just look in the yellow pages and find your local Lawn mower repair facility. Then, bring a sample of tubing or the ID that you need. They will have it there.

This hobby is WAY too expensive!!

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06-12-2009 10:17 PM  8 years agoPost 15
TaleGunner

rrElite Veteran

Deer Park WA

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I get the good stuff from NAPA auto parts also they have the best price.

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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