TD .09 fuel draw.

**Cribbs74** Sat Nov 02, 2013 11:53 am

I am considering a Jr. Ringmaster build in the future and I was wondering how well the TD .09 will draw fuel from a standard vent CL tank setup.

I know the TD .049 has fuel draw issues, but I am not sure if the TD .09 is the same. I would prefer not to use pressure.

If anyone has used a TD .09 on a CL plane I would be happy to hear from you.

Ron

anm2 Sat Nov 02, 2013 6:54 pm

What type of fuel draw issues does a Tee Dee .049 have? Andy

**Cribbs74** Sat Nov 02, 2013 9:00 pm

Well, It doesn't draw well... lol!

not sure how to explain it, but I imagine because of the venturi size it doesn't create much vacuum therfore it has a hard time drawing fuel to the spray bar.

This is why a lot of folks (myself included) will use bladder pressure when running A TD. With regular metal style tanks the lack of draw becomes apparent during hard cornering.

Hope that helps a little. It would be easier to show you in flight than explain it. Maybe someone else can explain it better.

Ron

balogh Sun Nov 03, 2013 1:22 pm

Cribbs74 wrote:Well, It doesn't draw well... not sure how to explain it, but I imagine because of the venturi size it doesn't create much vacuum therfore it has a hard time drawing fuel to the spray bar.

This is why a lot of folks (myself included) will use bladder pressure when running A TD. With regular metal style tanks the lack of draw becomes apparent during hard cornering.

Hope that helps a little. It would be easier to show you in flight than explain it. Maybe someone else can explain it better.

Ron

I always use atmospheric ballon tanks with TeeDees and never experienved fuel draw problem as long as the fuel line was fit to the carburetor nipple air-tight, and the needle valve was also sealed with a piece of silicone fuul tube drawn overw the threaded nipple of the carburettor that holds the needle valve...

**Cribbs74** Sun Nov 03, 2013 1:41 pm

It's a thought. I really enjoy the fill, flip and fly you get with a fixed hard tank though. I guess when the time comes I'll just see what works best.

tubebass Sun Nov 03, 2013 2:26 pm

I suspect the SPI has an impact on fuel draw as well.

John Goddard Tue Nov 26, 2013 6:11 am

You could always try a an R/C type 'silencer' Ron they have a pressure nipple on them.
I had no probs with the 09 r/c in my Old Timer even inverted it just worked.
Very Happy

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