KR> Max Fuel Flow Test
I performed this check also, but like Mark, I did it for my own piece of mind. I changed all my fuel line from 1/4" rubber hose/barb fittings to 3/8" aluminum tubing with flair fittings and Stainless braided aeroquip hose from the gascolator to the engine. I calculated the 1/2 tank flow rate at 17 gallons per hour. More than enough for a 2100cc revmaster. Cheers, Dave From: Mark Langford <m...@n56ml.com> To: KRnet <kr...@mylist.net> Sent: Sunday, January 1, 2012 6:13 PM Subject: Re: KR> Max Fuel Flow Test Sid Wood wrote: >Question: Has any or everyone else did or had to do this max flow test? Sure. I would hope we've all done it, but not because anybody made me do it...just did it because it was the smart thing to do. Mine was something like 38 gph flow, although the Corvair only needs about 9.5 gph at max flow (rich). The "minimum fuel" issue might be a bit sticky though. I located my fuel pickup so it was about midway between minimum flight angle and cruise angle of attack, because I figured I'd be slowing down to best economy speed if I thought I was that low on fuel. But 14 degrees isn't exactly the most efficient angle of attack for that configuration, although it is the angle you'd be landing at, but you should "have it made" on the runway before you get to that angle of attack. Mark Langford ML at N56ML.com website at http://www.N56ML.com ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> Max Fuel Flow Test
Sid Wood wrote: >Question: Has any or everyone else did or had to do this max flow test? Sure. I would hope we've all done it, but not because anybody made me do it...just did it because it was the smart thing to do. Mine was something like 38 gph flow, although the Corvair only needs about 9.5 gph at max flow (rich). The "minimum fuel" issue might be a bit sticky though. I located my fuel pickup so it was about midway between minimum flight angle and cruise angle of attack, because I figured I'd be slowing down to best economy speed if I thought I was that low on fuel. But 14 degrees isn't exactly the most efficient angle of attack for that configuration, although it is the angle you'd be landing at, but you should "have it made" on the runway before you get to that angle of attack. Mark Langford ML at N56ML.com website at http://www.N56ML.com
KR> Max Fuel Flow Test
At 05:28 PM 1/1/2012, you wrote: >Question: Has any or everyone else did or had to do this max flow test? ++ P.S. The flow test is much easier to do in a tail dragger. :-) :-) Larry Flesner
KR> Max Fuel Flow Test
At 05:28 PM 1/1/2012, you wrote: >Question: Has any or everyone else did or had to do this max flow test? I was not requested or required to perform the test but I did it on my own. My Facet pumps deliver 30 gallon per hour, 500 percent of the required flow. Also, because I have wing tanks only and no gravity feed, I checked the vertical draw the pumps handle too in order to prime the lines from empty tanks. I stopped the test at 30 inches. That seemed sufficient. I had intended to use a check valve on each pump as they are plumbed in parallel but a test I ran indicated that to be unnecessary. I hooked two pumps head to head and was unable to pump fuel backwards through either pump. I've got 430 hours on the same pumps I started with. Do not take these results as an indication of how your system will work, each one is different, and do all your own testing. Larry Flesner
KR> Max Fuel Flow Test
Here are two pictures for a max fuel flow test to determine if the fuel system can deliver at least 150% fuel flow to the engine during worst case conditions of 14 degrees angle of attack, full throttle and minimum fuel in the operating tank. My FAA inspector mandated criteria is to bleed off 50% more fuel than the engine is burning and still maintain full throttle RPM. And yes, N6242 supplied 350%. Question: Has any or everyone else did or had to do this max flow test? First picture is testing the Facet electric pump alone. Second picture is to test engine driven mechanical pump alone. https://s3.amazonaws.com/expercraft/sidwood/20469958474effc9269e823.jpg https://s3.amazonaws.com/expercraft/sidwood/13515213244effc989701f2.jpg Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA smw...@md.metrocast.net
