[NSRCA-discussion] YS DZ operation

[Ryan Smith]

John,

You need a foam clunk. That breaks up the air bubbles that go into the clunk
line so that you have a constant fuel supply. I think heli places have foam
clunks, but a friend of mine bought one from there and it was like $25. I
think Du-Bro makes some kind of clunk with foam in it, but I've never used
one on a DZ. A header tank does not eliminate the need for a foam clunk.
You'll run the foam clunk in the header tank, and you can run a regular
clunk in the main tank. I've always used a header tank with the DZs, a lot
of other guys say it's not necessary, and I think pretty much all the
Japanese do not run a header tank.

I hope this helps.

Ryan
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Gayer
Sent: Wednesday, February 04, 2009 11:02 AM
To: NSRCA Mailing List
Subject: [NSRCA-discussion] YS DZ operation

I have a few questions on the recommended fuel system for the DZ 
engines. I'm having occasional difficulty with a 140 DZ trying to quit 
once fuel level gets down to a half tank. I am not using either a foam 
clunk or a hopper tank currently.

1) Is a foam clunk necessary?
2) Is there an alternate source for these foam clunks? 15 dollars seem 
excessive for a tank clunk
3) If a hopper tank is used, does this eliminate the need for a foam clunk?
4) For a hopper tank, I would use a 2 ounce tank. Should a clunk be used 
or a hard pickup to the tank center? Overflow(input line from main tank) 
to top of hopper tank?

Thanks

John

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