---------------------------------------------------------- Zenith701801-List Digest Archive --- Total Messages Posted Wed 07/06/11: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:40 AM - Fuel flow test results. (John Marzulli) 2. 01:25 AM - Re: Fuel flow test results. (Craig Payne) 3. 01:40 AM - Re: Fuel flow test results. (John Marzulli) 4. 03:42 AM - Re: Fuel flow test results. (MacDonald Doug) 5. 07:30 AM - Re: Fuel flow test results. (Craig Payne) 6. 08:12 AM - Re: DIY Dynon AOA (Geoff Heap) 7. 08:27 AM - Re: Fuel flow test results. (John Marzulli) ________________________________ Message 1 _____________________________________ Time: 12:40:41 AM PST US Subject: Zenith701801-List: Fuel flow test results. From: John Marzulli I did a nose high fuel flow test ( Rotax 912 ). I uncoupled a line right before a carb and raised the tail until fuel stopped flowing. The results stunned me. With 5 gallons in each wing the flow stopped at about 15 degrees above resting. The nose was WELL below the tank fittings at that point. This raises several questions: 1) What is the expected attitude for fuel to stop flowing without the mechanical pump running? 2) What is the expected attitude for fuel to stop flowing WITH the mechanical pump running. 3) What about a nose down attitude? With the fuel fittings at the rear of the tank a nose down attitude even with considerable fuel could cause starvation. The fuel system is run to plans. I used the stock tanks with the factory fittings. The stock gascolator is being used with the position indicated by plans. Thanks, John Marzulli http://MarzulliPhoto.net/ http://701Builder.blogspot.com/ ________________________________ Message 2 _____________________________________ Time: 01:25:26 AM PST US From: "Craig Payne" Subject: RE: Zenith701801-List: Fuel flow test results. Were the caps on the fuel tanks? Are they vented? If you leave the plane in a level attitude how much of your 2*5 gallons flow out? When you stopped was there the same amount of fuel in both tanks? Did the flow stop completely or was it just reduced to a trickle? -- Craig ________________________________ Message 3 _____________________________________ Time: 01:40:57 AM PST US Subject: Re: Zenith701801-List: Fuel flow test results. From: John Marzulli The caps were on the tanks and they are vented ( at least that is what Zenith tells me ). We didn't do a full flow measurement with a meter, so the start point is somewhat arbitrary. at fifteen degrees the fuel was fully stopped. John Marzulli http://MarzulliPhoto.net/ http://701Builder.blogspot.com/ On Wed, Jul 6, 2011 at 1:23 AM, Craig Payne wrote: > Were the caps on the fuel tanks? Are they vented?**** > > ** ** > > If you leave the plane in a level attitude how much of your 2*5 gallons flow out?**** > > ** ** > > When you stopped was there the same amount of fuel in both tanks?**** > > ** ** > > Did the flow stop completely or was it just reduced to a trickle?**** > > ** ** > > -- Craig**** > > ** ** > > * > > * > > ________________________________ Message 4 _____________________________________ Time: 03:42:33 AM PST US From: MacDonald Doug Subject: Re: Zenith701801-List: Fuel flow test results. John, I had a similar issue when I did my fuel flow test last fall.- To g et a =0Atrue flow value I ended up disconnecting the fuel line at the inlet to the =0Apump.- I think I was able to get the 2X max fuel-demand up t o about 16 degrees =0A(at 17 it dropped off significantly).- In the test you describe, the carb ends =0Aof the hoses are lower than the tank outlets but the fuel pump is likely at or =0Aabove the tank outlet.- That is the one big pain about where Rotax puts-its fuel =0Apump.- Here in Canada, fuel flow checks are manditory.- The inspector accepted =0Athe fuel chec k at the pump because of the nature of the Rotax pump.=0A=0AKeep in mind th at your 15 degrees isn't the max climb angle of the plane, it is =0Ajust th e max climb angle with a failed fuel pump.=0A=0ADoug MacDonald=0ACH-701 fro m scratch=0ANW Ontario, Canada=0A=0ADo Not Archive=0A=0A=0A=0A_____________ ___________________=0AFrom: John Marzulli =0ATo: z enith701801-list@matronics.com=0ASent: Wed, July 6, 2011 3:38:03 AM=0ASubje ct: Re: Zenith701801-List: Fuel flow test results.=0A=0AThe caps were on th e tanks and they are vented ( at least that is what Zenith =0Atells me ). =0A=0AWe didn't do a full flow measurement with a meter, so the start point is =0Asomewhat arbitrary. at fifteen degrees the fuel was fully stopped. =0A=0AJohn Marzulli=0A=0Ahttp://MarzulliPhoto.net/=0Ahttp://701Builder.blog spot.com/ ________________________________ Message 5 _____________________________________ Time: 07:30:02 AM PST US From: "Craig Payne" Subject: RE: Zenith701801-List: Fuel flow test results. My plans also say the caps are vented (upper left corner of 7V11. But they also say to drill an 1/8th inch hole in the caps. Or just try leaving them off. Still seems odd though. After you lowered the nose did the flow restart? That would show that no crud had blocked something. -- Craig From: owner-zenith701801-list-server@matronics.com [mailto:owner-zenith701801-list-server@matronics.com] On Behalf Of John Marzulli Sent: Wednesday, July 06, 2011 1:38 AM Subject: Re: Zenith701801-List: Fuel flow test results. The caps were on the tanks and they are vented ( at least that is what Zenith tells me ). We didn't do a full flow measurement with a meter, so the start point is somewhat arbitrary. at fifteen degrees the fuel was fully stopped. John Marzulli http://MarzulliPhoto.net/ http://701Builder.blogspot.com/ On Wed, Jul 6, 2011 at 1:23 AM, Craig Payne wrote: Were the caps on the fuel tanks? Are they vented? If you leave the plane in a level attitude how much of your 2*5 gallons flow out? When you stopped was there the same amount of fuel in both tanks? Did the flow stop completely or was it just reduced to a trickle? -- Craig ist" target="_blank">http://www.matronics.com/Navigator?Zenith701801-List tp://forums.matronics.com _blank">http://www.matronics.com/contribution ________________________________ Message 6 _____________________________________ Time: 08:12:07 AM PST US Subject: Zenith701801-List: Re: DIY Dynon AOA From: "Geoff Heap" Hi. I have a D180 also but I purchased the Dynon Pitot/static tube assy with it. In your case, if you put the bend as shown by the black line. Are you then going to cut the tube back so that there is only an inch or so of 45? Or, instead of the bend as shown, you might put the bend an inch or so from the open end. That would leave the two tube ends closer together. if you make it as shown it looks kinda wild. But hey, why not,if it works.........Geoff -------- Dual controls. Dynon 180. Icom 210 Garmin 296. Becker transponder. Sigtronics intercom. Electric flaperons. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=345120#345120 ________________________________ Message 7 _____________________________________ Time: 08:27:13 AM PST US Subject: Re: Zenith701801-List: Fuel flow test results. From: John Marzulli Thanks Doug. I'll retry the test that way Craig - The fuel did start flowing again when the nose was lowered. John Marzulli http://MarzulliPhoto.net/ http://701Builder.blogspot.com/ On Wed, Jul 6, 2011 at 7:27 AM, Craig Payne wrote: > My plans also say the caps are vented (upper left corner of 7V11. But they > also say to drill an 1/8th inch hole in the caps. Or just try leaving them > off.**** > > ** ** > > Still seems odd though. After you lowered the nose did the flow restart? > That would show that no crud had blocked something.**** > > ** ** > > -- Craig**** > > ** ** > > *From:* owner-zenith701801-list-server@matronics.com [mailto: > owner-zenith701801-list-server@matronics.com] *On Behalf Of *John Marzulli > *Sent:* Wednesday, July 06, 2011 1:38 AM > > *To:* zenith701801-list@matronics.com > *Subject:* Re: Zenith701801-List: Fuel flow test results.**** > > ** ** > > The caps were on the tanks and they are vented ( at least that is what > Zenith tells me ). > > We didn't do a full flow measurement with a meter, so the start point is > somewhat arbitrary. at fifteen degrees the fuel was fully stopped. > > John Marzulli > > http://MarzulliPhoto.net/ > http://701Builder.blogspot.com/ > > **** > > On Wed, Jul 6, 2011 at 1:23 AM, Craig Payne > wrote:**** > > Were the caps on the fuel tanks? Are they vented?**** > > **** > > If you leave the plane in a level attitude how much of your 2*5 gallons flow out?**** > > **** > > When you stopped was there the same amount of fuel in both tanks?**** > > **** > > ** ** > > Did the flow stop completely or was it just reduced to a trickle?**** > > **** > > -- Craig**** > > **** > > * * > > * * > > *ist" target="_blank">http://www.matronics.com/Navigator?Zenith701801-List* > > *tp://forums.matronics.com* > > *_blank">http://www.matronics.com/contribution* > > * * > > ** ** > > * * > > * * > > ** > > ** > > ** > > ** > > ** > > *http://www.matronics.com/Navigator?Zenith701801-List* > > ** > > ** > > *http://forums.matronics.com* > > ** > > ** > > ** > > ** > > *http://www.matronics.com/contribution* > > ** > > * * > > * > > * > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith701801-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith701801-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/zenith701801-list Browse Digests http://www.matronics.com/digest/zenith701801-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.