---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Tue 10/07/08: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:17 AM - FloScan sensors; which model? (Frans Veldman) 2. 01:47 AM - Re: FloScan sensors; which model? (G-IANI) 3. 02:09 AM - Re: FloScan sensors; which model? (josok) 4. 04:04 AM - Re: FloScan sensors; which model? (Frans Veldman) 5. 04:05 AM - Re: Re: FloScan sensors; which model? (Frans Veldman) 6. 07:03 AM - Re: FloScan sensors; which model? (David Joyce) 7. 12:08 PM - Re: when to attach spar strap (ALAN YERLY) ________________________________ Message 1 _____________________________________ Time: 12:17:32 AM PST US Subject: Europa-List: FloScan sensors; which model? From: "Frans Veldman" I'm about to finish the fuel system. Part of the installation are two floscan sensors. I have the 'A' models, suitable for a flow of 0.2 to 30 GPH. I just realised that although the consumption of the Rotax 914 is well within the lower part of the range of these sensors, the total flow is near, or possibly exceeding, the limits of these sensors. Near their upper limit, they exhibit a pressure loss of 2.6 psi, and since the pressure of the fuel-over-airbox is about 6 psi, this looks significant. Has anyone used these sensors with a 914? Should I exchange them for the bigger sensors, which are capable of dealing with 60 GPH, and generally exhibit half the pressure loss? Frans Visit - www.EuropaOwners.org ________________________________ Message 2 _____________________________________ Time: 01:47:05 AM PST US From: "G-IANI" Subject: RE: Europa-List: FloScan sensors; which model? Frans G-IANI has the 914 and two Floscan 201A-6 sensors. By the way the "A" tells you it is the light weight aircraft model. The B and C models have higher flow capacity and weight a lot more. At full boost the 914 takes 28 LITRES per hour so well within the rang of the sensor. Ian Rickard G-IANI XS Trigear, 200 hours Europa Club Mods Rep (Trigear) e-mail mods@europaclub.org.uk or direct g-iani@ntlworld.com ________________________________ Message 3 _____________________________________ Time: 02:09:31 AM PST US Subject: Europa-List: Re: FloScan sensors; which model? From: "josok" Hi Frans, The maximum consumption of a 914 is below 25 liters per hour. So whatever pressure loss occurs at 120 l/h is not important. The lower sensivity on the other hand is important, because running idle will bring the consumption close to the lower limit, and so introduce a fault in the fuel totaliser. The 914 has its own fuel pressure regulator, to compensate fuel pressure to airbox pressure. A slight drop in the feed line will be compensated for. I had a button to remove the input from the return Flow sensor from the fuel totaliser. In the checklist procedure after engine start, pressing the button gave me a reliable impression of the state of the filters, pumps and lines. Regarards, Jos Okhuijsen Visit - www.EuropaOwners.org ________________________________ Message 4 _____________________________________ Time: 04:04:50 AM PST US From: Frans Veldman Subject: Re: Europa-List: FloScan sensors; which model? G-IANI wrote: > At full boost the 914 takes 28 LITRES per hour so well within the rang of > the sensor. If there were no return line, yes. But if the whole system pumps 120 litres per hour, the first flow sensor sees 120 litres passing, and the one in the return line sees 92 liters passing. The consumption is then 28 litres indeed, but this is not what is actually flowing through the sensors. Hence my question whether the flow sensors are not a little bit on the small side. Frans ________________________________ Message 5 _____________________________________ Time: 04:05:27 AM PST US From: Frans Veldman Subject: Re: Europa-List: Re: FloScan sensors; which model? josok wrote: > > Hi Frans, > > The maximum consumption of a 914 is below 25 liters per hour. So > whatever pressure loss occurs at 120 l/h is not important. It is, because this is what could be flowing through the sensor at that moment. > The lower > sensivity on the other hand is important, because running idle will > bring the consumption close to the lower limit, If I understand it correct, the amount of fuel flowing through the sensor is depending on the fuel pump, not the actual consumption of the engine. > I had a button to > remove the input from the return Flow sensor from the fuel totaliser. Ah, and what did you see then? Of course this button did not change the amount of fuel flowing, but the value you were seeing when pressing the button would probably be a lot more than the acutal consumption of the engine, right? Frans ________________________________ Message 6 _____________________________________ Time: 07:03:06 AM PST US From: "David Joyce" Subject: Re: Europa-List: FloScan sensors; which model? Frans, My 914 with JPI 450 and 2 Floscan 201 A6 (PN201-031-00) transducers actually consumes 30 l/hr at 164 knts/5500RPM/34.7in MP at 6500ft. Part of the testing to satisfy the PFA/LAA involed fuel flow tests by disconnecting the return hose and seeing how much came out with one or 2 pumps going. I can't find the work sheet with the precise figure, but I know the answer came out at something like 2 and a bit l/min and my inspector was entirely happy. The actual flow rate is of course regulated largely by the pressure release valve. My reading before fitting these transducers convinced me that they were the gold standard, fitted to the bulk of certified aircraft that have fuel flow systems. Regards, David Joyce, G-XSDJ ----- Original Message ----- From: "Frans Veldman" Sent: Tuesday, October 07, 2008 12:09 PM Subject: Re: Europa-List: FloScan sensors; which model? > > > G-IANI wrote: >> At full boost the 914 takes 28 LITRES per hour so well within the rang of >> the sensor. > > If there were no return line, yes. But if the whole system pumps 120 > litres per hour, the first flow sensor sees 120 litres passing, and the > one in the return line sees 92 liters passing. The consumption is then > 28 litres indeed, but this is not what is actually flowing through the > sensors. > > Hence my question whether the flow sensors are not a little bit on the > small side. > > Frans > > > ________________________________ Message 7 _____________________________________ Time: 12:08:48 PM PST US From: "ALAN YERLY" Subject: Re: Europa-List: when to attach spar strap Rowland and others, The exact time to do the spar strap is up to you. I do it when convenient after rig of the sockets. Be sure to set each wing at the same incidence angle prior to glassing. I set the cardboard as depicted and I ensure that the release tape has two layers on the spar so the rig/de-rig gets just a little more play. Note the spacing between the starboard root spar and the socket or the between spar spacing when rigged to the fuselage. In the shop here, I use a spare socket cup to set the spacing, but a thin washer will do. That spacing needs to be duplicated so the spar strap is not to narrow. I set up the wings top side up and jig them in place. Once I have the glass on, I put peel ply around it and then tape it up to hold the glass from sagging. Once cured, it pulls apart easily. Doing it this way really makes the alignment through the spar strap a breeze later on. Remember, the spar strap needs to be snug, not tight. As far as when to do it, I like the spar strap for self rigging as it is a built in alignment device for me. Once I have the wings rigged, I put on the spar strap. Personally, it is a must for tail draggers. Note: Depending on your clearances, once I found that the aileron cross link bolts scraped on the strap during rig. I changed out the bolt to a 525 screw for clearance. Enjoy your building. Bud Yerly Custom Flight Creations (813) 653-4989 ----- Original Message ----- From: Rowland & Wilma Carson To: Europa e-mail list Sent: Sunday, October 05, 2008 11:16 AM Subject: Europa-List: when to attach spar strap > My wings are in the garage, pinned to the cockpit module with the seatback bushes happily curing as in manual chapter 14. Looking some way ahead to chapter 27, I note the need to add a retaining strap to the port spar which has to be laid up around the starboard spar. I can't see why I shouldn't do this layup now, while I have everything conveniently to hand, but maybe there is something I have overlooked. Can anyone think of a good reason to postpone this layup until later? regards Rowland -- | Rowland Carson LAA #16532 http://home.clara.net/rowil/aviation/ | 1120 hours building Europa #435 G-ROWI e-mail > http://www.matronics.com/Navigator?Europa-List http://www.matronics.com/contribution ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-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/europa-list Browse Digests http://www.matronics.com/digest/europa-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.