---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 07/16/05: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:10 AM - Re: OVP crowbar false triggering (Thomas Johnson) 2. 06:23 AM - Re: OVP, Alternators, and stuff (Eric M. Jones) 3. 06:28 PM - Dual Fuel Pumps and EFI (John Burnaby) 4. 06:28 PM - Dual Fuel Pumps and EFI (John Burnaby) ________________________________ Message 1 _____________________________________ Time: 12:10:18 AM PST US From: "Thomas Johnson" Subject: AeroElectric-List: Re: OVP crowbar false triggering --> AeroElectric-List message posted by: "Thomas Johnson" Bob N, I would be delighted to put my hands on your airplane with some test equipment to see if we can understand why it's so different. I would like that too but I am in SoCal and you are not (COME ON OUT! I'll buy lunch!). What do you think is the minimum requirement for test equipment to get some useful data on this? I think the answer will be "more than I can afford" but it does not hurt to ask. Do you still have the old module? If so, you can send it back to me for a no-charge upgrade. Yes, I have all of them. I built four but it was really 2 X 2 versions. I will round them up and send them to the address on your web site if I don't hear otherwise. I do not need you to send replacements for my sake, I am quite happy with the "MOS-FET miracle" I am flying now. I would be willing try out new versions in my airplane and report the results. to see which one is the "rose wood stake". Please forgive my ignorance. I know what a "rosetta stone" is, but I do not know what "rose wood stake" means. It always hurts to ask this kind of question but if I don't ask I will never know. Tom Johnson ________________________________ Message 2 _____________________________________ Time: 06:23:22 AM PST US From: "Eric M. Jones" Subject: AeroElectric-List: Re: OVP, Alternators, and stuff 0.60 COMMA_SUBJECT Subject is like 'Re: FDSDS, this is a subject' --> AeroElectric-List message posted by: "Eric M. Jones" --> AeroElectric-List message posted by: plaurence@the-beach.net >> --> AeroElectric-List message posted by: "Eric M. Jones" >> >> >> --> AeroElectric-List message posted by: Mickey Coggins >> >> >> one is the only one you need. When you consider it, the race car >> battery switches are better than battery contactor; the starter >> contactor is only used to allow the use of a wimpy ignition >> keyswitch;...........Eric >What manly keyswitch would use for the starter? I don't know of a 300A keyswitch either. I meant to imply that using a separate manual switch for starting might be better. >Also, I believe the contactor is used so that in case the solenoid sticks >and the ring gear remains engaged, there is no power to the starter...Peter In that case powering down the whole system might be better. Many starters use a built-in solenoid, and I'd go with one of those. Again a stuck starter would mean powering down. --> AeroElectric-List message posted by: Mickey Coggins >> approach is to eliminate all the other contactors anyway so this one is >> the >> only one you need. When you consider it, the race car battery switches >> are >> better than battery contactor; ...Eric >Sounds interesting. Do you have one you recommend, and will they >work for rear mounted batteries? I've already got mine hooked up >with standard contactors, but it's always fun to learn something >new. I don't know the best one. Perhaps the Aeroelectric minions can find the best one. But start with the battery disconnects from Flaming-River.com ( http://www.flamingriver.com/index.cfm/page/ptype=results/Category_ID=133/home_id=76/mode=cat/cat133.htm ) would probably work. I am still in search mode on this. Regards, Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge MA 01550-2705 (508) 764-2072 "Nothing is too wonderful to be true." James Clerk Maxwell, discoverer of electromagnetism "Too much of a good thing can be wonderful." Mae West, discoverer of personal magnetism ________________________________ Message 3 _____________________________________ Time: 06:28:23 PM PST US From: "John Burnaby" Subject: AeroElectric-List: Dual Fuel Pumps and EFI --> AeroElectric-List message posted by: "John Burnaby" I want to wire 2 fuel pumps, for an EFI system, into AEC schematic Z-14 so that when fuel pressure drops below a preset psi, the secondary pump turns on and locks on ,and I want to have manual overides. I was told pressure switches are not that accurate re repeatability and that I would be better off with a pressure transducer. I'm not sure what a transducer is and how it would be integrated into a switch that would control the pumps, but I'm guessing that the pressure sensing device (transducer?) would be wired into some sort of locking relay. I welcome any ideas. Thanks, John ________________________________ Message 4 _____________________________________ Time: 06:28:33 PM PST US From: "John Burnaby" Subject: AeroElectric-List: Dual Fuel Pumps and EFI --> AeroElectric-List message posted by: "John Burnaby" I want to wire 2 fuel pumps, for an EFI system, into AEC schematic Z-14 so that when fuel pressure drops below a preset psi, the secondary pump turns on and locks on ,and I want to have manual overides. I was told pressure switches are not that accurate re repeatability and that I would be better off with a pressure transducer. I'm not sure what a transducer is and how it would be integrated into a switch that would control the pumps, but I'm guessing that the pressure sensing device (transducer?) would be wired into some sort of locking relay. I welcome any ideas. Thanks, John