Thanks Mark J, Larry F & Bill C for the info concerning header tanks. I took a look at your websights and that cleared up a few things too. Bill sure makes a good argument for keeping the header tank. I havn't got around to shopping for a carb yet so I might even need gravity feed for all I know. Thanks guys. Regards Dene Collett KR2SRT builder South africa Whisper assembler See: www.whisperaircraft.com mailto: av...@telkomsa.net ----- Original Message ----- From: "Larry&Sallie Flesner" <fles...@verizon.net> To: "KRnet" <kr...@mylist.net> Sent: Friday, January 05, 2007 01:30 Subject: Re: KR> header tanks
> > > > >I have been thinking long and hard about the possibility of not installing > >my aluminum header tank and just sticking with the two outboard wing tanks. > >Dene Collett > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > Dene, > > I have tanks in the outboard wing panels only, no header tank. Check > out http://mysite.verizon.net/flesner/22.jpg > > They are 10 inches from the forward spar rearward and run the entire > length of the outer wing except for the tips. Each wing holds 12 1/2 > gallon. With no gravity feed and no engine driven fuel pump, I use > a small backup battery for emergency power if I lose my main > electrical buss. I use dual electrical fuel pumps. Located between > the shutoff valve from each wing is a T fitting that goes to the two > pumps which are plumbed in parallel. With this setup I can pump > from either or both tanks with either or both pumps. My backup > system saved the day at the12 hour mark in testing when I lost my main > electrical buss due to a bad connection in the master switch circuit. > I'm using capacitance fuel probes that are not very accurate at the > moment, due I think to a need to re-calibrate. My shutoff valves are > located on the forward side of the spar between the pilots legs and > the fuel pumps are on the cabin floor just below them. I built a panel > to cover them. In the following photo you can just see the ends of > the shutoff valve handles and the "emergency" (red) panel on the > bottom of the instrument panel. > http://mysite.verizon.net/flesner/2.jpg > > I like the idea of not having any fuel tanks internal to the fuselage and > gain the additional advantage of the fuel load not being carried by the > wing attach fittings. My C.G. moves forward 1 inch from full to empty > tanks. The tanks are well baffled, I get no noticeable sloshing and > feel no ill effects on handling. I have never had a problem with the > pumps priming or pulling fuel from the tanks. 270 hours and no > problems. As always, your results may vary. :-) > > Larry Flesner > > > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html >
