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Joined: 12/7/2001 From: Andover,
MN, USA Status: offline
If your plane just has a venturi with no carb control, set up a simple device that pinches off your fuel line in flight. We commonly run a piece of looped music wire through a tube, with the fuel line running through the loop. When you pull the throttle back, the wire pulls the fuel line into the tube pinching off the fuel supply and shutting the engine down.
Posts: 2854
Joined: 12/29/2001 From: Brantford, ON, CANADA Status: offline
quote:
I just assumed you pylon pro's were using something more professional
Pylon racers are very simple people. We do not bog ourselves down with gadgets. There is nothing more professional than something that costs virtually nothing, is very simple to construct, requires no maintenance and works every time.
Posts: 7011
Joined: 12/7/2001 From: Andover,
MN, USA Status: offline
A fixed pickup will work also, and were commonly used in QM and early Quickee. I'm not a big fan of them because every time you do this to shut down, your putting a strain on your engine as it fights for fuel and starts sucking air at the same time causing a lean condition.
Also, I'm not sure how you could set up a fixed pick up with todays bladder tanks.
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Joined: 8/10/2004 From: APO, AE, USA Status: offline
Could someone pls draw-up the tube and loop for me? I have a picture of it in my head but its always better when you can see exactly what someone else is doing. I'm just getting into pylon racing and I'm looking to learn as much as i can. I just brought a foam cutter and wing bagger. I enjoy reading all of the vets do's and dont's.
Posts: 7011
Joined: 12/7/2001 From: Andover,
MN, USA Status: offline
This shows the tube exit the front of the firewall. A simple plastic Bic Pen works good. Just cutoff a 3/4" piece and glue it into the firewall. Make sure there are no rough edges to damage the fuel line. The music wire that I use is .0032" and I use a simple easy connector on the servo. Use just enough throw on the servo (ATV) to pinch the line, you don't want to stall the servo. After the engine dies I immediate open the throttle back up before landing. This takes the strain off the servo, and also opens the line before I land so I can refill the tank. I've never been a big fan of the backwards tank, I like to see if my line is pinched, and I don't have to turn my radio back on to open it if I forget to do it before shutting off the plane. I have had smaller, cheaper (Hitec 85) type servos stall and fail with this hook up. I pretty much stick with either a Hitec 225, Expert SL 451, or the Futaba 3102 as pictured.
Posts: 2854
Joined: 12/29/2001 From: Brantford, ON, CANADA Status: offline
quote:
Ok, I'll bite. Whats the thinking behind the reverse fuel tank installation
There is nothing to bite on. The thinking is this. What could be simpler than the installation shown. A short shut-off wire not having to go past the tank and through the firewall. No fuel lines looping in and out of the engine compartment like a tangle of spaghetti, the lines come from the tank, through the shut-off and straight to the engine. There is no need for a Popsicle stick strapped to the tank to prevent the tank from jerking forward and pinching the line. Every time the wing is removed the feed and pressure line can be inspected.
The reverse tank works only with the Tettra type tank, it will not work with a clunk tank.
Of the three shut-off pictures shown on this thread, which is the simplest to install, cheapest and most convenient?
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All Forums >> RC Airplanes >> Pylon Universe - RC Pylon Racing >> General Racing Discussion >> Who makes a fuel shut off valve that is compatible with glow fuels? 
Who makes a fuel shut off valve that is compatible with... - 
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