---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Tue 06/19/12: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:34 AM - Airmaster AP420 on Europa 3300 (Carl Meek) 2. 12:16 PM - Fuel Pressure (BobbyPaulk@comcast.net) 3. 01:37 PM - Re: Fuel Pressure (FLYaDIVE) 4. 02:40 PM - Re: Fuel Pump (FLYaDIVE) 5. 02:58 PM - Re: Airmaster AP420 on Europa 3300 (FLYaDIVE) ________________________________ Message 1 _____________________________________ Time: 05:34:14 AM PST US Subject: JabiruEngine-List: Airmaster AP420 on Europa 3300 From: Carl Meek I currently run a Europa with Seisenich fixed wood prop on a Jabiru 3300. It's a little tight getting out of my 450m strip, I wouldn't want a more coarse prop. Cruise is 118kts at Sea Level at 2850rpm I'm wondering whether to spend the money on the air master prop, but I'm a novice to CS/VP props. I imagine it will give me better power out of the strip and a higher cruise and/or lower RPM in cruise. Does anyone have any thoughts? Is it worth the money? What gains will I reasonably expect? Regards, -Carl. ________________________________ Message 2 _____________________________________ Time: 12:16:24 PM PST US From: BobbyPaulk@comcast.net Subject: JabiruEngine-List: Fuel Pressure Many Thanks to Pete, Chuck, and Gerald for all the great info. I usually use the boost pump on take off but for some reason that morning I did not. I was not in a hurry and was the only one flying off the field at the time. Engine was cool. I guess I need a check list for my check list. I am using 92 Oct. Non Ethanol Marine fuel and an automotive clear cleanable 5 micron fuel filter with replaceable elements. It shows every piece of grit or trash and I have cleaned it only once in 3 yrs and it did not need it then. The filter is between my pump and carb so if the filter clogs the pressure would go up instead if down. I will double check my gascolator though. It is in the belly and is before the boost and engine driven pumps. If the screen is partially gunked up it would drop the pressure. Draining the quick drain only showed a few tiny grit particles. I am going to set my low fuel pressure alarm down and monitor very closely. Will post any thing unusual. Thanks again Bobby ( age 74 ) Zodiac 601 XL "B" Jabiru 3300 S/N 1141 Sensenich 64" x 51" Prop Bing Carb 260 Main & 285 Needle Jet Status - Flying 153 hrs. ________________________________ Message 3 _____________________________________ Time: 01:37:28 PM PST US Subject: Re: JabiruEngine-List: Fuel Pressure From: FLYaDIVE Bobby: Isn't the fuel pump part of your fuel supply system and doesn't it also deserve a clean fuel supply? So why not put the fuel filter as the first line of defense in the entire system. The only thing you will have to change your thought process - Clogged Fuel Filter = LOW or NO Fuel Pressure. One thing I have learned about human nature is: When it comes to gauges - NO INDICATION gets one attention. Higher indications require an additional thinking process which is not normal and confusing and requires MORE Time in deciphering. Was that pressure 5 PSI or 8 PSI, doesn't pressure increase when fluid is cold, was that were the needle was at start up, where was the needle on the last flight, I'm looking at the gauge from an angle- does that mean it is lower than it really is? Too many questions. No needle movement = You have a problem = LAND. Barry On Tue, Jun 19, 2012 at 3:15 PM, wrote: > > > Many Thanks to Pete, Chuck, and Gerald for all the great info. > I usually use the boost pump on take off but for some reason that morning > I did not. I was not in a hurry and was the only one flying off the field > at the time. Engine was cool. I guess I need a check list for my check > list. > I am using 92 Oct. Non Ethanol Marine fuel and an automotive clear > cleanable 5 micron fuel filter with replaceable elements. It shows every > piece of grit or trash and I have cleaned it only once in 3 yrs and it did > not need it then. The filter is between my pump and carb so if the filter > clogs the pressure would go up instead if down. I will double check my > gascolator though. It is in the belly and is before the boost and engine > driven pumps. If the screen is partially gunked up it would drop the > pressure. Draining the quick drain only showed a few tiny grit particles. > > I am going to set my low fuel pressure alarm down and monitor very closely. > > Will post any thing unusual. > > Thanks again > > Bobby ( age 74 ) > Zodiac 601 XL "B" > Jabiru 3300 S/N 1141 > Sensenich 64" x 51" Prop > Bing Carb 260 Main & 285 Needle Jet > Status - Flying 153 hrs. > > > * > > * > > ________________________________ Message 4 _____________________________________ Time: 02:40:44 PM PST US Subject: Re: JabiruEngine-List: Fuel Pump From: FLYaDIVE Bobby: At full throttle the carb float valve will be open more and longer and as your plumbing experience denotes - high flow equals lower pressure. The boost pump should be checked for operation at start-up, during Mag check, and ON for Takeoff and Landing. Once stabilized in cruse the pump should be turned off. Life expectancy of a fuel pump - Well which fuel pump do you have? The Facet fuel pump will last for years and years. I use one at work for pumping diesel in a test apparatus and it has performed flawless for thousands of hours. Your fuel pressure - Sure sounds acceptable to me. I would not concern myself with 0.1 and 0.2 PSI of change. The question that comes to my mind is the accuracy of the gauge, can it be trusted for such a small change and is it temperature compensating? The minimum safe pressure should be called out by the engine manufacture as well as the carb manufacture. Example: A low wing plane with both a electric fuel pump and an engine driven pump only requires 0.5 PSI as Min. Yet the gauge always shows about 4 to 6 PSI. What is important is the fuel line size. Volume flow is more important than pressure. If the engine is being leaned by a restriction in fuel flow you will never get the power you want. This is a case of Bigger is Better. Take care you O'l Honey Dipper. Barry On Mon, Jun 18, 2012 at 9:28 AM, wrote: > List > I have the Dynon engine monitor in my 601 with the Low Fuel pressure set > to 2.0 psi. This past Sat on take off roll the pressure went to 1.8 and the > alarm sounded. I hit the boost pump and elected to keep going when the > pressure came up to 2.3 Psi. At altitude (1500' ) I turned off the boost > pump after reducing power and the pressure stabilized at 2.4 psi. I decide > to experiment with throttle settings and at full power the pressure again > went to 1.8 psi. This happened 3 or 4 times with the same result. Normally > the pressure stays at 2.3 or 2.4 at full throttle. Taxiing out the pressure > is stable at 3.0. As an old plumber I understand that when the flow > increases the pressure will drop somewhat. My question is two fold. Is this > a sign of the pump failing soon?? How long should the fuel pump last ( > hours )? Also what would be a minimum safe pressure at take off power? > > I would like to hear from Pete at Jabiru USA on this issue. > Thank you > > Bobby ( age 74 ) > Zodiac 601 XL "B" > Jabiru 3300 S/N 1141 > Sensenich 64" x 51" Prop > Bing Carb 260 Main & 285 Needle Jet > Status - Flying 153 hrs. > > > * > > * > > ________________________________ Message 5 _____________________________________ Time: 02:58:50 PM PST US Subject: Re: JabiruEngine-List: Airmaster AP420 on Europa 3300 From: FLYaDIVE Carl: That could be a tight strip. 450 M = 1476 Ft. Have you worked out Vr Rotation Speed and Vrto = Rejected TakeOff speed? You did not say which Europa you have. But, isn't the Jabiru a heavier engine than the Rotax? And they give a takeoff roll of 590 Ft = 180 M which is 1/3 your runway length. That is 40% of your runway IF you start at the very end (not counting the length of your plane). AND - AND - That is on a STANDARD TEMP DAY. Runways get shorter on hot days. So, YES, I would highly consider a CS prop. And your cruse speed would go up also. Learning to fly a CS prop is only a few hours of training and a lot of reading. Barry On Tue, Jun 19, 2012 at 8:32 AM, Carl Meek wrote: > > I currently run a Europa with Seisenich fixed wood prop on a Jabiru 3300. > > It's a little tight getting out of my 450m strip, I wouldn't want a more > coarse prop. > Cruise is 118kts at Sea Level at 2850rpm > > I'm wondering whether to spend the money on the air master prop, but I'm a > novice to CS/VP props. I imagine it will give me better power out of the > strip and a higher cruise and/or lower RPM in cruise. > > Does anyone have any thoughts? Is it worth the money? What gains will I > reasonably expect? > > Regards, > -Carl. > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message jabiruengine-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/JabiruEngine-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/jabiruengine-list Browse Digests http://www.matronics.com/digest/jabiruengine-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.