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Dubros round nose tank has less useable fuel

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Dubros round nose tank has less useable fuel

Old 12-16-2011, 06:54 AM
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griesel
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Default Dubros round nose tank has less useable fuel

I had a Hempel Yak 55M 50CC with a Dubros 424 round nose 24 ounce tank
in it.I was landing with a slight nose down attitude; about 500 ft. of down wind;
400ft of cross wind and 200 ft of final when I decided I was still too high and
open up the throttle, to about half, to go around the engine picked up normally
and ran for about 3 seconds then died. I mishandled the dead stick landing
and crashed. Post crash analysis revealed the fuel system was OK with
7 ounces of fuel remaining. What I believe happened is that the fuel went
forward with a large amount going into the round nose exposing the klunk
and causing a dead stick. This was my first and last round nose tank. I
am sticking with rectangular tanks now on. This was corrected. I originally
called it a Sullivan.
Old 12-16-2011, 09:50 AM
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Lnewqban
 
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Default RE: Dubros round nose tank has less useable fuel

Sorry to read about the crash.[]

What specific tank were you using?

I believe that the slant type is the only 24 oz tank that Sullivan offers.
Old 12-16-2011, 11:47 AM
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griesel
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Default RE: Dubros round nose tank has less useable fuel

Corrected to correct tank
Old 12-16-2011, 12:49 PM
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blikseme300
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Default RE: Dubros round nose tank has less useable fuel

Sorry to hear about your accident. What clunk were you using?

I have used Walbro felt clunks exclusively in this style of tank and have run tanks dry during flight. 7oz left in tank sounds like you had a plumbing problem and a rectangular tank would probably not have helped. Just sayin'.

Bliksem
Old 12-16-2011, 01:58 PM
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MetallicaJunkie
 
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Default RE: Dubros round nose tank has less useable fuel

i use felt clunks too... and they do run the tank completely dry as mentioned above
Old 12-16-2011, 03:27 PM
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Default RE: Dubros round nose tank has less useable fuel

Certainly with 7 oz. of fuel left in the tank, the shape of the tank was not the problem. In a normal fuel system there is enough fuel in just the outside fuel line and clunk line to keep an engine running through any normal approach and landing.
Old 12-16-2011, 05:07 PM
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griesel
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Default RE: Dubros round nose tank has less useable fuel

Yes if I had landed with the throttle off or nearly off. But I went to 1/2 throttle and used
up the fuel in the line in about 3 seconds.
Old 12-17-2011, 06:08 AM
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exeter_acres
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Default RE: Dubros round nose tank has less useable fuel


ORIGINAL: Truckracer

Certainly with 7 oz. of fuel left in the tank, the shape of the tank was not the problem. In a normal fuel system there is enough fuel in just the outside fuel line and clunk line to keep an engine running through any normal approach and landing.
that is correct...

more than enough...
Old 12-18-2011, 02:28 AM
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liquid_TR
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Default RE: Dubros round nose tank has less useable fuel

I also dont like those round nose tanks, and never use them. However in your case that cannot be the reason for dead-stick.
When you apply throttle, even for a split second the fuel in the tank will move backwards because of acceleration, and stay there.

you dead-stick happed either because of bad plumbing, air-leak, ignition failure, opto kill fail, bad plug, mis-tuning or bad fuel.

pick one.

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