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General control line discussion => Open Forum => Topic started by: Garf on April 26, 2008, 04:20:54 PM
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I am having a lot of fuel feed problems on a couple of profile planes, probably because of viabration problems. I need to use a short tank because of clearances. Standard tanks haven't worked very well, so I tried a GRW chicken hopper. So far it is the best one yet. I have a bucket of tanks, old/new, small,large etc. What I don't have is a clear understanding of the porting arrangment between the main tank and the hopper. I don't want to take apart the one tank I have that works, but if it comes down to it, I will have to. Where can I find the details of the porting?
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I've used the GRW brand of Chicken Hoppers for at least 15 years, back to when Glen Wells used to set up sales tables at the contests to display his wares. They worked well for "Slow Combat" and for sport flying using old Slow Combat models after that event died. But I never had particularly good luck with them when using classic 4-2-4 type engines on profiles, such as the OS Max-S 35s and Fox Stunt 35s.
They are Uniflow, and both the uniflow vent and the fuel pickup end at the back of the small "Hopper" tank, same as any other uniflow is plumbed. You fill through the vent. The overflow ends inside the tank in the inside front corner, and is capped off for flight. Several holes in the outer wedge of the main tank interconnect the two parts of the tank.