Originally Posted by Swatin Flys

Just add an hour to the night flying.

I should buy some of those Chief Aircraft lights...

Maybe since there is not enough room on FG we could finally get hooked on the Northwest IMAC site on the International IMAC web site.
Oh and BTW Robert Godfrey is cutting a nother run of the 40% Extra and thought that it would be a good idea to get on the list. Get in touch with him at bobflies.com
Michael

Here's a Great video of a fuel tank in flight......Ever wonder whats going on with the clunk on the downlines?.....Enjoy

Airplane Fuel Tank Aerial Video (2 min 3 sec)

>Dave

Originally Posted by divad

Here's a Great video of a fuel tank in flight......Ever wonder whats going on with the clunk on the downlines?.....Enjoy
Airplane Fuel Tank Aerial Video - YouTube
>Dave

Dave,
That was a great idea and educational.
It looks as though there is a limit on how long you can fly on a
down line before the fuel in the line is exhausted.
Great job.
Paul

Great idea! I've been told that the fuel is pushed towered the back of the tank in a downline. I didn't think that was the case...

Originally Posted by divad

Here's a Great video of a fuel tank in flight......Ever wonder whats going on with the clunk on the downlines?.....Enjoy
Airplane Fuel Tank Aerial Video - YouTube
>Dave

Hmmmm....no wonder so many engines quit on the downline. Might be worthwhile to investigate the advantage of a "double clunk" set up.....one in the normal position and one shortened to feed from the front half of the tank. You could just feed them into a "Tee" either inside or outside the tank.

CB

We need to install a kicker tank like in a Helicopter. One tank stays full until the main tank is empty.

Originally Posted by divad

Here's a Great video of a fuel tank in flight......Ever wonder whats going on with the clunk on the downlines?.....Enjoy
Airplane Fuel Tank Aerial Video - YouTube
>Dave

Wow! That's very interesting, I'm surprised we don't have more engine quiting after seeing that. Installing a small hopper tank infront of the main tank would help I think. I did this when I installed the 200 in the carden this year for a differnet reason but now I'm glad I did. The hopper tank will stay full right up to the end.

Originally Posted by Henry Piorun

Wow! That's very interesting, I'm surprised we don't have more engine quiting after seeing that. Installing a small hopper tank infront of the main tank would help I think. I did this when I installed the 200 in the carden this year for a differnet reason but now I'm glad I did. The hopper tank will stay full right up to the end.

Please show a picture.
Paul

I think the next test needs to be.....how long the engine will run at idle when the pick-up line clunk gets pulled from the fuel. This test would have to be done with a measured tank to engine line length including the inside clunk line, as all will not be the same.
This would determine how many seconds to dead stick at idle.

Another idea would be to do a looped feed line, to supply a little extra fuel. This would certainly help with shorter feed lines.

>Dave

Originally Posted by divad

I think the next test needs to be.....how long the engine will run at idle when the pick-up line clunk gets pulled from the fuel. This test would have to be done with a measured tank to engine line length including the inside clunk line, as all will not be the same.
This would determine how many seconds to dead stick at idle.

Another idea would be to do a looped feed line, to supply a little extra fuel. This would certainly help with shorter feed lines.

>Dave

David,
If you did this test, you could establish the minimum length of fuel line that
should be used regardless of the distance the tank is from the carburetor.
I think your idea is worth trying.
You have presented an interesting discussion.
Paul

https://www.flyinggiants.com/swapsho...ct=28302&cat=5
Pro Flows for sale!!!!

We should transfer this to the water bottle thread.

Originally Posted by jlloyd1995

We should transfer this to the water bottle thread.

The video is actually from that thread. It was done by barnstormer. I have gotten his permission to publish it to our thread.

I was going to create this same type of video, but my smaller gas planes engine is having issues.

I really doubt any of us are having down-line fuel starvation issues, or this would have been fixed long ago. However it is a little disturbing watching that video, and seeing the clunk out of the fuel for that long

Whatever you think though, Do Not do a flexible clunk line. It will get stuck forward and that's worse!

Darren Kuhn was having issues in Redmond with his engine dying on downlines.