Return-Path: Received: from wind.imbris.com ([216.18.130.7]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Wed, 26 Jul 2000 02:19:47 -0400 Received: from regandesigns.com (nortel131-91.imbris.com [216.18.131.91]) by wind.imbris.com (8.9.3/8.9.3) with ESMTP id XAA53174; Tue, 25 Jul 2000 23:25:25 -0700 (PDT) Message-ID: <397E8621.907A38A1@regandesigns.com> Date: Tue, 25 Jul 2000 23:33:05 -0700 From: "Hamid A. Wasti" To: lancair.list@olsusa.com Subject: Re: Diode Voltage Drop References: X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> "Rumburg, William" wrote: > There are others trying as hard as they can to find fault with my > backup battery switching and charging system. Well Bill, whether it was intended to be a public post or not, it is now and hence deserves a public response. Regardless of what any one of us may have to say about anyone else's design, we must keep one very important thing in mind: Our airplanes are classified as "Experimental". What that means is that we are free to experiment -- basically do whatever we want. If one want to have a grapefruit or a potato as our backup electrical source, the FAA or anyone else can not prevent you from doing it. If it works, great; if it fails and ends up hurting and killing us and anyone willing to take the risk of flying with us, as far as the FAA is concerned that is fine too. All that the law requires is that we advise our passengers of the experimental nature of the aircraft and let them decide. Based on their knowledge of the pilot, if they think that the person can be trusted, they will go flying, otherwise people will make excuses like "I would love to fly with you, but I am really looking forward to spending the weekend with my in-laws" What others are pointing out, and I am one of several who have raised questions, is that maybe the approach you have taken may not be as sound as you are projecting it to be. You can choose to look into the specific areas pointed out to you or you can ignore it all -- it is up to you (see the previous paragraph). > Have you seen the recent posts > from Hamid Wasti? Judging from his email address, he apparantly works for > Brent Regan. I work with Brent Regan and do electrical design. Most of my designs can be found in two areas -- medical and aviation. Sierra Flight System's EFIS2000, Northstar's CT-1000 and its UPS are among my designs that many people here may be familiar with. One other design (with internal battery ) is being demonstrated at the Farnborough air show (the big iron equivalent of Oshkosh) this week. Next year there will most probably be 2+ Other designs include electronics for a number of robots used for human surgery. I will also be giving a talk this Friday at Oshkosh on rechargeable batteries. > I'll have to contact VMS and Concorde for information in order > to rebutt some of his questions, If I recall correctly, the question was raised about the charging voltage on the Sears DieHard motorcycle battery. Where does Concorde come in? Next, let me try and understand what you are saying. People pointed some potential problems in your system. Even without any data (you have to ask VMS & Concord) you have already decided that you do not have a problem and you need that data to rebut the questions? With no offense to the legal profession, are you trying to be an engineer looking for facts to see if there is indeed a problem that needs to be addressed or are you trying to be a lawyer who is obliged to vigorously defend his case regardless of facts? > but I would expect a $40. multimeter to > have more accuracy than he attributes to the $ 4,000. VMS. Now I am really not sure what you are saying here. I had suggested that you look at the specs for a VMS and see how accurate it is. When you start looking at things to an accuracy of 0.1V (actually, in your analysis you were out of spec by 0.1V) you need to make sure that you are measuring using something that has adequate accuracy. Would you measure the thickness of a 0.005" piece of paper with a wooden foot ruler? Hamid >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>