ILVSMOG,

1/8" hingpoints should be sufficient for the ST as long as you use enough of them.

As for the pump issues either of the two methods will work and yes, you should run one any time the tank is mounted at or near the CG. I've found this to be especially critical on 3D aircraft that you intent to hover. Without a pump the engine will sag and/or simply run out of fuel as the pressure created by the muffler tap simply cannot create the pressure differential needed to ensure positive flow. As far as the Perry or Cline Regulator goes it's a bit of a toss up as they both have their strangths and weaknesses. I am running the Perry in my ST with a Saito 1.50 and it works great but it took a bit to get the flow to the engine dialed in correctly. Once set however, I haven't had to touch it. I've used a Cline regulator to solve a fuel flow problem in my GP Super Stearman with a Saito 1.80 where I was having both draw and siphoning issues (siphoning on the ground and then leaning out at the top end resulting in loss of rpm). The Cline is very simple to set up, solved both problems, actually provides a more consitent flow regardless of engine speed and there are no settings to mess with. Essentially it converts the entire system to a pressurized system by placing a check valve in the exhaust pressure line to build pressure in the tank. There are no settings to mess with and they even recommned that you just leave it hanging in the fuel line so there really are no mountng isses to speak of. The only issue that I have run into (and they mention it in the directions) is that you will have to choke the engine until sufficient pressure builds in the tank. This is an issue on Saitos as they no longer provide chokes. I fabricated one from a 4-40 rod, a rubber stopper and a spring so that I just push a ball driver through a hole in the cowl and stopper seats in the "velocity" stack. When I release it pulls up out of the way. Sealing the exhaust and turning the engine over does not work.

So it's up to you either will work. I think the Perry is about $40 while the Cline is $60.

I would also recommend, as mentioned in the thread, epoxying the elevator halves together. Even if they are solid on day one they get pretty loose over time to the point that they begin to affect flight behavior.