---------------------------------------------------------- Zenith701801-List Digest Archive --- Total Messages Posted Thu 09/11/08: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:22 AM - Re: Unequal fuel tank levels (Zed Smith) 2. 06:40 AM - Re: Unequal fuel tank levels (n85ae) 3. 08:16 AM - test (Dan) 4. 08:27 AM - Re: test (Ken Arnold) 5. 11:32 AM - CH701 POH (Ken Arnold) 6. 12:54 PM - Re: Shoulder Harness attachment (n85ae) 7. 02:46 PM - Re: CH701 POH (John Swanson) 8. 05:19 PM - Re: Shoulder Harness attachment (Viper_on_line) ________________________________ Message 1 _____________________________________ Time: 05:22:39 AM PST US From: Zed Smith Subject: Zenith701801-List: Re: Unequal fuel tank levels do not archive Gravity-induced air leakage is the problem. One wing, being slightly lower than the other, upsets the intended equal distribution of fuel. This then results in massive amounts of air getting into the higher tank. A two-inch left-to-right tilt is nearly one-half the depth of the 701 tanks; nearly one-half the capacity. A wise old ag pilot once told me that the prop was just a big fan....it is there to keep the pilot cool. He went on to say that if the fan stops you can see the pilot sweat. Those with unequal fuel levels may need to install an auxillary air pump to replenish the tank with less air. This may help to keep the fan running. Everybody have a nice day, and straighten up and fly right-hand patterns!! Zed ________________________________ Message 2 _____________________________________ Time: 06:40:59 AM PST US Subject: Zenith701801-List: Re: Unequal fuel tank levels From: "n85ae" If you guys REALLY want to understand why the fuel level is different, then you have to drop the simplistic view. Go to Google and search on "fluid dynamics hydraulic head", it's not completely simple but this is the explanation as to why the difference. There are a great number of factors that are at play, the end result is pressure differential across the tanks Regards, Jeff Read this topic online here: http://forums.matronics.com/viewtopic.php?p 3794#203794 ________________________________ Message 3 _____________________________________ Time: 08:16:37 AM PST US From: Dan Subject: Zenith701801-List: test test do not archive ________________________________ Message 4 _____________________________________ Time: 08:27:23 AM PST US From: "Ken Arnold" Subject: Re: Zenith701801-List: test good test Dan, do not archive ----- Original Message ----- From: "Dan" Sent: Thursday, September 11, 2008 11:13 AM Subject: Zenith701801-List: test > > test > do not archive > > > > > ________________________________ Message 5 _____________________________________ Time: 11:32:34 AM PST US From: "Ken Arnold" Subject: Zenith701801-List: CH701 POH Hi Listers, I have a draft of the subject. Still needs some tweaks. Anyone wanting to take a look is welcome. Please contact me directly via my e-mail address. Regards, Ken do not archive ________________________________ Message 6 _____________________________________ Time: 12:54:34 PM PST US Subject: Zenith701801-List: Re: Shoulder Harness attachment From: "n85ae" Something to think about, because Zenith sure did not do their engineering calculation with regard to the seatbelts. I calculated the stock 801 seat belt tabs at 200lb.s at 10G's in shear, if indeed the rivets don't pull out before that. So I replaced them with 4130 steel the same thickness which I bolted with AN3's to the fueslage longerons. I also added structure to the center console. Crash impacts can go up to 40/50G's and be survivable, so I'm not sure what they were thinking when the designed the stock ones. But they were not designed to handle more than the bare minimum. I suppose if I crash that hard I might not survive anyway, but I sure don't want to leave on account the seat belt tabs sheared. Jeff Read this topic online here: http://forums.matronics.com/viewtopic.php?p 3870#203870 ________________________________ Message 7 _____________________________________ Time: 02:46:12 PM PST US From: "John Swanson" Subject: Re: Zenith701801-List: CH701 POH ----- Original Message ----- From: Ken Arnold To: zenith-list@matronics.com Sent: Thursday, September 11, 2008 2:30 PM Subject: Zenith701801-List: CH701 POH Hi Listers, I have a draft of the subject. Still needs some tweaks. Anyone wanting to take a look is welcome. Please contact me directly via my e-mail address. Regards, Ken do not archive KenI would like to see ur Poh I hope have my 701 flying this month.CH701 912 ULSJohn Swanson ------------------------------------------------------------------------- ----- Checked by AVG - http://www.avg.com 9/11/2008 7:03 AM ________________________________ Message 8 _____________________________________ Time: 05:19:57 PM PST US Subject: Zenith701801-List: Re: Shoulder Harness attachment From: "Viper_on_line" Thanks Guys, The load dissipation of the seat belt mount can become intricate when you can't get to a longeron as in the case of the shoulder harness. And then as has been said is the 0.063 going to be going to be strong enough to prevent the bolt ripping out if you make the mounting structure too strong? I think it is better to have the seatbelt support structure crumple but keep you at least partially secure than have the belt bolt rip out. At this stage the plan is to increase the shoulder harness attachment brackets to 0.093 and using Larry's idea of a cross fuselage support at the front/rear baggage shelf junction and the zee channel all secured with A5 rivets. To spread the load I am using .040 L's from the centre of the cross fuselage harness support (long name?) to the back corners of the rear baggage shelf. Thus creating a truss of the rear baggage shelf and spreading the load hopefully over the whole area. Does that sound suitable to the more engineering minded of you? [Question] -------- 701 scratch builder one day it will fly Read this topic online here: http://forums.matronics.com/viewtopic.php?p 3905#203905 ------------------------------------------------------------------------------------- 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.