Header Tanks?
 

I HAVE NOT USED THEM BEFORE. WHAT ARE THE PROS & CONS OF USING THEM ON FOUR STROKES(DZ) AND TWO STROKES?
THANKS!

Header Tanks?
 

The DZ's don't need them do they? Although I think the Matts were using a header tank in their Smaragds in Cork. I think the are also in the pictures of the Cyclone on www.plprod.com , although I am not sure. The main pro that I know of is that you can put the tank of an un-pumped engine on the CoG, or in a strange position, although I am not sure. I am sure though for a competition plane, it would weigh a tiny little bit more than a standard set-up. I really don't know if a DZ would need one, but I really doubt it.
My $2.....
Robert.

Robert.

Header Tanks?
 

As Robert stated, I can also see no benefit to running a header tank on a DZ.

Header tank on a DZ
 

The only time I can see using a header tank on the DZ is if you are not using the Foam clunk.....Since the clunk comes with the motor...just use this in place of your regular clunk.....They sell extras too....

I have run the DZ on a standard clunk...and it works fine..The problem is below half tank it may hick up a little or a couple times...it might even get a big enough gulp of air to die....

But I flew it a bunch and was able to complete a P-03 sequence and then at least get into and F-03 before the sag of n air bubble...This is witha 20oz Tettra tank and stad clunk....


With the Foamie clunk I can get to the Rolling loop from the top and sometimes it will have a hick up going up the hill....And sometimes not...Most definately I get a hick up on the Humpy with a full roll up and 2 neg snaps down....But sometimes I can even complete this one....It about 90% of my flights I can complete everything but the last maneuver the Hourglass...and sometimes I can even do it....this is all with flying the P-03 pattern as well.


The header tank will work on the un-pumped motors....And it works well. Another thing that it works on is if you are tail heavy and approaching the 5kg limit.....Since the last couple ozs can be far forward this will make for a steady CG until they are gone then the shift will be more aft....This is a way to move weight that is already inside your airplane...Fuel and doesn't count when you are on the scale.....Of course the extra weight of the tank and plumbing has to be there....But in some cases this is less than the 4oz of lead you are adding to the nose....


Troy

HEADER TANKS
 

Troy pretty much said most of it. I have run a header in my Prophecy Wwith an S.T.2300 trying to get it to run good. But you still have to pull fuel from about 18' back of the engine. Even with good muffler pressure I could still starve it in negative manuvers like at the top of an outside loop because the tank was about 3 inches higher then the carb, Ok in most attitudes except negative hard pushes. Finally put a perry pump and carb on it. Should have gotten a pumped engine to begin with. Header tanks are crucial to keeping air bubbles out of the system. The jet guys use them a lot because of this and tank location and multiple tank setups.

header tank & bubbles in dz
 

AS TOYMAKER STATED: THE HEADER TANK WILL ELIMINATE AIT BUBBLES WHICH I HEAR CAN CUASE DEAD STICKS IN THE YS DZ. WHAT SAY YOU?