Thanks Sid for the numbers?. I am using a 3/8 fuel line via a pump to feed the TBFI system? jw
Joe. E. Wallace jwallacep51 at gmail.com > On Aug 10, 2015, at 14:21, Sid Wood via KRnet <krnet at list.krnet.org> wrote: > > FAA document AC 90-89A (now superseded by AC 90-89B) SECTION 11. ADDITIONAL > ENGINE TESTS, paragraph 1.e. Fuel Flow and Unusable Fuel Check: states the > method to determine the fuel flow needed by amateur built aircraft. > At the airworthiness inspection for my KR-2 the FAA inspector wanted to see > the data and pictures of the tests that I did to determine the actual fuel > flow. For pressurized systems (using a fuel pump) the flow must be at least > 1.25 times the WOT requirement and setting at 5 degrees above the maximum > angle of attack and minimum fuel in the tank. For gravity feed systems the > number is 1.50 times the WOT requirement. For engine driven fuel pumps, that > may require some creative plumbing for the test. I used a quart catch jar > and timed (in seconds) to fill it. Put a shut off valve on the end of the > hose so you or your assistant can control the start and stop flow into the > jar. I used 3/8-inch tubing for all fuel lines. My flow numbers were 21 > gal/hr for the engine pump and 23 gal/hr for the Facet pump. Those numbers > are way over the minimum requirements. Don't know what 1/4-inch tubing would > yield. > Since my KR-2 has both an electric Facet and engine driven fuel pumps and two > fuel tanks, the tests had to be repeated 4 times to measure all line-ups. > Handling a fuel hose behind an invisible meat chopper in hurricane force > winds does present some hazards to your health. A calibrated inline fuel > flow meter will vastly simplify making the measurements. > > Sid Wood > Tri-gear KR-2 N6242 > Mechanicsville, MD, USA > ------------------------------------------------------------------ > Good Info Brian? my plans were to mount it lower than the wing cells?. so > I?m okay there? Also transferring to main tank but by 1/4? lines?.. then > return overflow to one wing cell again via 1/4 ? Considering more volume > under pump pressure than gravity flow overflow to wing? I would appreciate > any comments on line size.. or am I being to engineered? jw > > Joe. E. Wallace > jwallacep51 at gmail.com > >> On Aug 8, 2015, at 16:27, brian.kraut--- via KRnet <krnet at list.krnet.org> >> wrote: >> >> Keep those Facet pumps low. They don't do good with pulling a prime >> uphill which I learned on my aux wing tanks transferring to the header >> tank. I originally had my pump mounted on the back side of the header >> tank, but I moved it down low on a doubler on the front of the spar when >> I had an issue with it not sucking up a prime. >> >> >> -------- Original Message -------- >> Subject: Re: KR> fuel line through the spar caps? >> From: ppaulvsk via KRnet <krnet at list.krnet.org> >> Date: Fri, August 07, 2015 11:27 am >> To: KRnet <krnet at list.krnet.org> >> Cc: ppaulvsk <ppaulvsk at aol.com> >> >> I wasn't planning on going to the spar cap. Just the center of the web. >> After the holes are drilled. I'm putting a 1/8" plywood doubler over >> them.Then run the tube threw it. Like what Mark said. My goal is to keep >> the fuek coming out of the tanks in the same plain befor going though >> the firewall to the duel Facet pumps. Larry, there is a horizontal brace >> on the back side of the spar and my floor covers the front side. Like >> most KR-2S >> > > > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options
