Return-Path: Received: from [65.33.160.13] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WebUser 4.2) with HTTP id 383788 for lml@lancaironline.net; Sun, 29 Aug 2004 17:25:36 -0400 From: "Marvin Kaye" Subject: Re: [LML] Re: LOP vs ROP To: lml X-Mailer: CommuniGate Pro WebUser Interface v.4.2 Date: Sun, 29 Aug 2004 17:25:36 -0400 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit Posted for "George Braly" : Jeff, Your comments are thought provoking. I guess it is possible I am just dreaming this up from foggy memory, but I don't think so. I think I still have the old Chelton data download files around. Not sure. From memory, when we got the airplane, the owner was operating it in the climb about like this: 31" x 2500 x 28 to 3x gph with the TIT at about 1430-1460F He was using a typical 165KIAS for cooling, and he had only about 600 to 700 fpm ROC. I verified this with some test flying. You had to use the 165KIAS or the temps soared!!! Hottest CHT was about 415 to 430F by the time you got to 17,000 feet, even using 165KIAS. When we finished modifying the system and fixing the fuel injector and fuel flow set up, we were, again from memory, climbing about like this: 38-39" x 2700 x 45 to 46.5 gph. TIT down about 1320 to 1380F KIAS was about 145. Hottest CHT was about 380F in the climb. ROC was around 2000 fpm. Now, for a sanity check: A 3200 lb TN Bonanza at 120 knots and 300 Hp will climb 1100 FPM to 17,000 feet on a std day . If you add an additional 50 Hp, (up to 350 Hp) that same 3200 lb Bonanza will climb an additional 516 fpm faster, or around 1600 FPM. Just using the TN Bo as a "rationality check" I I can't see why a 3200 lb LIV with 350 Hp would not climb at least 1600 FPM, and maybe better than that given the smaller airframe and much lower drag issues. I do know the owner of the airplane, after the modifications we installed, began getting comments, complaints/ altitude restrictions, etc, from ATC that he was sometimes climbing out of their airspace vertically, in an unexpected manner, due to his unexpectedly high ROC. But....hard data is hard data. One thing for sure, climb is all about raw horsepower, prop efficiency, and cooling!!! Regards, George