RE: Inverted engine/header tank/fuel pumps
The links:
Iron Bay: [link]http://www.ironbaymodelcompany.com/Webpages/Accessories/Accessories.html[/link]
Cline Regulator: [link]http://www.billsroom.com/pcfs/products/CFS/fuelsysdesc.htm[/link]
Perry: [link]http://www.perrypumps.com/prod02.htm[/link]
Interestingly, the Perry pumps that operate off of crankcase pulses (VP30) claim to have a regulator feature (which would presumably defeat siphoning). The vibrational activated pumps (VP20) are silent on this point:
"The VP-30 regulating pump is capable of performing like no other fuel delivery system. It delivers an ideal .25 PSI to any model carburetor from a .15 to a 3.0 cu.in. engine. The pressure remains constant throughout the entire speed range, making the carburetor adjustment easy and simple. Once the needle valve is adjusted, the mixture will not vary regardless of how low the fuel or the attitude of the airplane, thus eliminating rich/lean runs altogether."
"The VP-20 pump for your 4-cycle engine is used by thousands of modelers throughout the world because it is trouble free and provides the most reliable fuel delivery to your 4-cycle engine. This pump mounts to the front or back of the crankcase, on a mounting plate supplied with the VP-20 and 22SG pumps. The pumps are actuated by engine vibration. May also be used for 2-cycle engines. Not recommended for opposed multi-cylinder engines."