---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Mon 04/23/12: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:55 AM - Re: Fuel filters (Thom Riddle) 2. 02:09 PM - Re: Re: Fuel filters (FLYaDIVE) ________________________________ Message 1 _____________________________________ Time: 04:55:57 AM PST US Subject: RotaxEngines-List: Re: Fuel filters From: "Thom Riddle" Barry, 43.13 concerns maintenance, repair and inspection of type certificated aircraft. The FAR that covers fuel flow requirements for type certificated aircraft is 23.955, excerpts of which follows: 23.955 Fuel flow. (b) Gravity systems. The fuel flow rate for gravity systems (main and reserve supply) must be 150 percent of the takeoff fuel consumption of the engine. Notice that the gravity feed system flow requirement is only 50% greater than max fuel flow demand at take-off power. -------- Thom Riddle Buffalo, NY (9G0) Kolb Slingshot SS-021 Jabiru 2200A #1574 Tennessee Prop 64x32 Truth is what stands the test of experience. - Albert Einstein Read this topic online here: http://forums.matronics.com/viewtopic.php?p=371583#371583 ________________________________ Message 2 _____________________________________ Time: 02:09:10 PM PST US Subject: Re: RotaxEngines-List: Re: Fuel filters From: FLYaDIVE Tom: AC43.13 a/b are " Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair". It does go one step further in that it says AC Large... As in Aircraft Large. BUT, as any builder will attest to - Try to get a experimental aircraft approved by a DAR (at least any DAR worth his weight in dirt) without referencing AC 43.13. But, I took your lead and searched and searched for the number '8' times I mentioned but could not find it. I remember that number from a Build Clinic I went to at Sun'nFun. I did go to the FAR 23.955. It does state 150% of Full Power (Take Off) fuel flow for a gravity feed system. But, maybe the difference comes from the statement that it is 8 times the 'Cruse' fuel flow. I can see where that would create a area of great question. Example: If we both have the same engine and I cruse at 85% power and you cruse at 55% power - 8 times 55% is a lot less than 8 times 85%. So the fuel flow rates would be different... Maybe that is where 8 comes in??? I will commit that 150% at Full Throttle to memory. BUT! Remember that is MINIMUM NUMBER for acceptance. And here is another area where the FAA messed up... They did not state at What Density Altitude. Fuel consumption at Colorado Springs, Co (~5280 Ft) would be a lot less that at Ocean City, NJ (~10 Ft). So if you were to install a small diameter fuel line and be happy at 150% flow in Colorado you could be running Lean at New Jersey. Maybe that is also where the speaker at Sun'n Fun came up with the number 8 from. Barry Experience is what you get from failures. - Barry On Mon, Apr 23, 2012 at 7:55 AM, Thom Riddle wrote: m > > > > Barry, > > 43.13 concerns maintenance, repair and inspection of type certificated > aircraft. > > The FAR that covers fuel flow requirements for type certificated aircraft > is 23.955, excerpts of which follows: > > =A7 23.955 Fuel flow. > (b) Gravity systems. The fuel flow rate for gravity systems (main and > reserve supply) must be 150 percent of the takeoff fuel consumption of th e > engine. > > Notice that the gravity feed system flow requirement is only 50% greater > than max fuel flow demand at take-off power. > > -------- > Thom Riddle > Buffalo, NY (9G0) > Kolb Slingshot SS-021 > Jabiru 2200A #1574 > Tennessee Prop 64x32 > > Truth is what stands the test of experience. > - Albert Einstein > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=371583#371583 > > =========== =========== =========== =========== > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.