Return-Path: Sender: (Marvin Kaye) To: lml Date: Mon, 24 Jun 2002 16:22:10 -0400 Message-ID: X-Original-Return-Path: Received: from fire.phys.cmu.edu ([128.2.26.129] verified) by logan.com (CommuniGate Pro SMTP 4.0b4) with ESMTP id 1511618 for lml@lancaironline.net; Mon, 24 Jun 2002 16:18:49 -0400 Received: from localhost (jbp@localhost) by fire.phys.cmu.edu (8.11.6/8.11.6) with ESMTP id g5OKI3N07942 for ; Mon, 24 Jun 2002 16:18:04 -0400 X-Original-Date: Mon, 24 Jun 2002 16:18:03 -0400 (EDT) From: Jeffery Peterson X-Original-To: lml@lancaironline.net Subject: L360 fuel options. In-Reply-To: X-Original-Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII I am updating and completing a 10 year old LNC2 kit. The wing tanks are closed out and sealed and so is the header tank. I can see several possible ways to hook up the fuel system and I would like to hear the opinions of the list members on this subject. options: 1) Stick to the original plans. Use all three tanks, with transfer pumps from each wing tank to the header. Positives: have all parts and most work is done. gravity feed from header to engine. Negatives: high pilot workload. chance of pumping an unknown quantity of fuel overboard if distracted. (fess up...does this happen?) Fuel poised to spray in your face in an off-field landing. 2) Use original setup but add electonics to automatically control xfers, or add an overflow alarm. Are most Lnc2s using this option? Seems like adding complexity to patch a poor design. 3) Use an andair 3 position valve. Dont install the xfer pumps. I still have a boost pump (in any case, right?) after the valve. Still have gravity feed from header which I use as the reserve tank. I still also have fuel above my knees. 4) Extend the wing tanks and eliminate the header. To do this I think I would need to create two bottom-side access panels on each wing. One below the current filler cap (so i can put sealer on the patch where i cut the old cap out) and the other below the new cap so I can paint sealer in the exgension volume and in the channels connecting the two volumes. anyone see an easier way to do this? positives: this is the legacy system. simple. plenty volume. negatives: CG moves aft when at full fuel. lots of work. access panels can leak. 5) extend the wing tanks. AND leave the header. use the 3 way valve. now i can give myself an overload waiver and cross large bodies of water. in normal operation I dont use the header. -Jeff Peterson N273CK LNC2 progressing nicely.