At 06:37 PM 7/10/2009, you wrote: >I am going to put my fuel in the wings. Larry Flesner says that I can get >10 gallons in each wing, which will give me my 20 gallons. I am going to >remove the header tank completely. Daniel R. Heath ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
You can get much more than 10 gallon in the outer wing panels but I wouldn't do it. I have a 12.5 gallon tank in each outer wing panel with no header tank. My tank is 10 inches horizontal behind the main spar and runs from the root 48 inch rib to the outer 36 inch rib in a stock KR2 RAF 48 wing. http://mysite.verizon.net/flesner/22.jpg The math prior to building indicated a 12.5 gallon tank. A later fill from a metered pump indicated 12.8 gallon so it was pretty close. By keeping the tank long and narrow you keep the bulk of the fuel very close to the C.G. so you get very little C.G. shift with fuel burn... Larry Flesner ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ I have Diehl wing skins and a fuel tank in each outer wing panel at the WAF attachment per the Diehl plans. The skins are RAF 48 but the spars taper according to the Diehl plans. Each tank goes from the WAF rib to the next rib and from the main spar to the aft spar. Measured capacity is 10.6 gallons with about 1/4 cup unusable level attitude. I also put a false rib in the center of the tank to keep the bottom of the tank from "oil canning". Diehl made the skins with Vinylester resin and I did the same to be sure the tanks are auto fuel proof. While you are about it, think through the fuel vent placement and plumbing. Tony Bengelis has some good illustrations in his book. http://websites.expercraft.com/sidwood/index.php?q=log_entry&log_id=7531 Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA smw...@md.metrocast.net
