---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 09/28/10: 13 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:25 AM - Re: Pitot pressure switch (JOHN TIPTON) 2. 04:24 AM - db connector hold-down screws () 3. 04:56 AM - Re: Vans RPM Transducer IE VTACHGEN 12 (Bubblehead) 4. 05:37 AM - Re: Pitot pressure switch (John Ciolino) 5. 05:39 AM - Re: db connector hold-down screws (j. davis) 6. 05:50 AM - Re: Vans RPM Transducer IE VTACHGEN 12 (Eric M. Jones) 7. 05:58 AM - Re: Pitot pressure switch (user9253) 8. 06:40 AM - Re: Re: Pitot pressure switch (Vern Little) 9. 06:42 AM - Re: Pitot pressure switch (user9253) 10. 01:38 PM - Re: Pitot pressure switch (Peter Pengilly) 11. 02:58 PM - Re: Re: Pitot pressure switch (Robert L. Nuckolls, III) 12. 04:40 PM - Please comment on my Wiring diagram J3300 and Exp Bus (ple190) 13. 04:49 PM - Comments J3300 exp bus wiring(smaller image) (ple190) ________________________________ Message 1 _____________________________________ Time: 03:25:23 AM PST US From: "JOHN TIPTON" Subject: Re: AeroElectric-List: Pitot pressure switch Hi Tom Is this what you are looking for: http://www.tcwtech.com/usw-1.HTM Regards John ----- Original Message ----- From: "tomcostanza" Sent: Tuesday, September 28, 2010 12:37 AM Subject: AeroElectric-List: Pitot pressure switch > > > Does anyone know a source for a pressure switch I can put in the > pitot/static system. I'd like to disable the flaps-down function if the > airspeed is above some reasonable value. I can find electronic sensors, > but I'd like to eliminate any electronics for simplicity. > > Thanks, > -Tom > > -------- > Clear Skies, > Tom Costanza > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=313929#313929 > > > ________________________________ Message 2 _____________________________________ Time: 04:24:46 AM PST US From: Subject: AeroElectric-List: db connector hold-down screws 9/28/2010 Hello J. Davis, You wrote: ".....how to fabricate hold-down screws for db connectors installed with no shells, but now can't locate it." See my posting of 5/29/2010 copied below. 'OC' Baker Says: "The best investment we can make is the time and effort to gather and understand knowledge." PS: Phillips drive machine screws are an abomination. Every builder who has converted to the Torx (6 lobe) drive screws has been delighted with the results. ======================================================= Time: 11:03:43 AM PST US From: "j. davis" Subject: AeroElectric-List: db connector hold-down screws Greetings... I remember seeing an article on how to fabricate hold-down screws for db connectors installed with no shells, but now can't locate it. I know it's not exactly rocket science, but would like to re-read the article. I'm pretty sure it was aeroelectric list related... Thanks! Regards, J. ======================================================== Match: #2Message: #49535From: Subject: D-subminiature ConnectorsDate: May 29, 2010 5/29/2010 Hello Fellow Builders, Here is what we are writing about: http://en.wikipedia.org/wiki/D-subminiature Bob Nuckolls writes: "It's a fact that the majority of d-sub connectors come with short, slotted-head 4-40 jack screws that are EXCEEDINGLY difficult to work with in confined spaces traversed by wire bundles." ..and ... "the inconvenience of stock, slot-head jack-screws." {RESPONSE} He offers a screw handling solution here: http://tinyurl.com/34nrdd5 I'd like to offer another solution -- use #4-40 machine screws with hex socket (Allen wrench) drive heads. The hex socket drive head allows one to manuever the small screws in a manner vastly superior to a straight slot or phillips drive head screw. See here for a source of such screws: http://www.microfasteners.com/catalog/products/SSC.cfm Here is just one source of tools for handling these screws: http://www.bondhus.com/ Conventional Allen wrenches work fine for most handling of these screws, but these Prohold tools will give even more control if needed: http://www.bondhus.com/features/prohold/body-0.htm 'OC' Says: "The best investment we can make is the effort to gather and understand knowledge." PS: An aerospace vehicle with hex socket or Torx / six lobe / star drive fasteners is much easier to work on than a vehicle with straight slot or Phillips drive fasteners. See here for some handy tool kits to work with the hex socket or Torx / six lobe / star drive fasteners: http://www.chapmanmfg.com/ ====================================================== DO NOT ARCHIVE ________________________________ Message 3 _____________________________________ Time: 04:56:10 AM PST US Subject: AeroElectric-List: Re: Vans RPM Transducer IE VTACHGEN 12 From: "Bubblehead" The answer may show up here: http://www.vansairforce.com/community/showthread.php?p=471022#post471022 -------- John Dalman Keller, TX RV-8 N247TD Read this topic online here: http://forums.matronics.com/viewtopic.php?p=313974#313974 ________________________________ Message 4 _____________________________________ Time: 05:37:23 AM PST US From: "John Ciolino" Subject: RE: AeroElectric-List: Pitot pressure switch Check www.aircraftextras.com. They have the switch you need. John Ciolino -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of tomcostanza Sent: Monday, September 27, 2010 7:37 PM Subject: AeroElectric-List: Pitot pressure switch Does anyone know a source for a pressure switch I can put in the pitot/static system. I'd like to disable the flaps-down function if the airspeed is above some reasonable value. I can find electronic sensors, but I'd like to eliminate any electronics for simplicity. Thanks, -Tom -------- Clear Skies, Tom Costanza Read this topic online here: http://forums.matronics.com/viewtopic.php?p=313929#313929 ________________________________ Message 5 _____________________________________ Time: 05:39:33 AM PST US From: "j. davis" Subject: Re: AeroElectric-List: db connector hold-down screws On 09/27/2010 06:21 PM, James Kilford wrote: > --> AeroElectric-List message posted by: James Kilford > > J, Bob posted some alternatives here: > > http://www.aeroelectric.com/Pictures/Connectors/D-Subminature/DIY_Jackscrews.jpg > > Hopefully that's what you were after. > > James Thanks to all! do not archive > > On 27 September 2010 18:56, j. davis wrote: >> --> AeroElectric-List message posted by: "j. davis" >> >> Greetings... >> >> I remember seeing an article on how to fabricate hold-down screws for db >> connectors >> installed with no shells, but now can't locate it. I know it's not exactly >> rocket science, but would like to re-read the article. I'm pretty sure it >> was aeroelectric list related... >> >> >> Thanks! >> -- Regards, J. Sonex #325 C-FJNJ, Jabiru 3300a, Prince P-Tip, Aerocarb restoring the Johnston Special http://cleco.ca +-------------------------------------------------------------+ | J. Davis, M.Sc. | (computer science) | | *NIX consulting, SysAdmin | email: jd at lawsonimaging.ca | +-------------------------------------------------------------+ Yesterday I parked my car in a tow-away zone...when I came back the entire area was missing... --- Steven Wright ________________________________ Message 6 _____________________________________ Time: 05:50:26 AM PST US Subject: AeroElectric-List: Re: Vans RPM Transducer IE VTACHGEN 12 From: "Eric M. Jones" I post this occasionally when this topic pops up. This is a divide-by-two rpm converter for anyone interested. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=298338#298338 Attachments: http://forums.matronics.com//files/tach_adapter_181.pdf -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones@charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=313983#313983 ________________________________ Message 7 _____________________________________ Time: 05:58:52 AM PST US Subject: AeroElectric-List: Re: Pitot pressure switch From: "user9253" I suggest that an override switch be wired in parallel with the pressure switch, in case the pressure switch fails open. An alternative to disabling the flaps would be an alarm that would sound if the flaps were lowered while above a certain speed. The pilot would hear the alarm as soon as the flaps started going down and she would let go of the switch before the flaps lowered enough to cause damage. (unless she is blonde) :D Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=313985#313985 ________________________________ Message 8 _____________________________________ Time: 06:40:52 AM PST US From: "Vern Little" Subject: Re: AeroElectric-List: Re: Pitot pressure switch I agree. In my opinion, you should always have direct pilot control coupled with an independent warning system. Automatic systems are like bureaucracies: They can be expensive, frustrating to get working and prone to failure when you need them the most! Vern -------------------------------------------------- From: "user9253" Sent: Tuesday, September 28, 2010 5:55 AM Subject: AeroElectric-List: Re: Pitot pressure switch > > > I suggest that an override switch be wired in parallel with the pressure > switch, in case the pressure switch fails open. > An alternative to disabling the flaps would be an alarm that would sound > if the flaps were lowered while above a certain speed. The pilot would > hear the alarm as soon as the flaps started going down and she would let > go of the switch before the flaps lowered enough to cause damage. (unless > she is blonde) :D > Joe > > -------- > Joe Gores > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=313985#313985 > > > > Checked by AVG - www.avg.com > 17:56:00 > ________________________________ Message 9 _____________________________________ Time: 06:42:53 AM PST US Subject: AeroElectric-List: Re: Pitot pressure switch From: "user9253" Kevin Horton made a spreadsheet that converts airspeed to pressure. This might help deciding which pressure switch to buy. www.tcwtech.com/airspeed%20conversion.xls Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=313987#313987 ________________________________ Message 10 ____________________________________ Time: 01:38:37 PM PST US From: Peter Pengilly Subject: Re: AeroElectric-List: Pitot pressure switch I'd suggest the switch from TCW also - but be careful how you wire it. Think about the scenarios when you would want it to work and when not, and then figure out the wiring. An over-ride switch also sounds sensible. Peter On 28/09/2010 00:37, tomcostanza wrote: > --> AeroElectric-List message posted by: "tomcostanza" > > Does anyone know a source for a pressure switch I can put in the pitot/static system. I'd like to disable the flaps-down function if the airspeed is above some reasonable value. I can find electronic sensors, but I'd like to eliminate any electronics for simplicity. > > Thanks, > -Tom > > -------- > Clear Skies, > Tom Costanza > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=313929#313929 > > ________________________________ Message 11 ____________________________________ Time: 02:58:12 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Pitot pressure switch At 07:55 AM 9/28/2010, you wrote: > >I suggest that an override switch be wired in parallel with the >pressure switch, in case the pressure switch fails open. > An alternative to disabling the flaps would be an alarm that > would sound if the flaps were lowered while above a certain > speed. The pilot would hear the alarm as soon as the flaps started > going down and she would let go of the switch before the flaps > lowered enough to cause damage. (unless she is blonde) :D I'll second that suggestion. Keep in mind too that any time you add complexity to any system, the parts counts go up and failure modes expand, probability for failure goes up. If it's your CD player or cabin air conditioning system, perhaps not a big concern . . . but hooking motors to flight control surfaces is IS a BIG concern. One is well advised to consider return on investment for adding complexity. Does it really ADD to safety? Does it add a bunch of convenience that helps you be a better pilot while adding little or no risk? Consider the potential risks for handing off legacy pilot duties to modern conveniences. Finally, when such systems are added, make sure that NO failure will produce a hazardous, un-commanded motion of the surface and NO failure can produce a hazardous failure-to-move the surface as needed. My all time favorite flap system was actuated by a handle that was pulled up off the floor. Nothing happened until I was ready for it to happen . . . and risk of the flaps not being available as needed was exceedingly low. Bob . . . ________________________________ Message 12 ____________________________________ Time: 04:40:57 PM PST US Subject: AeroElectric-List: Please comment on my Wiring diagram J3300 and Exp Bus From: "ple190" Any comment or suggestions appreciated, this is draft 3 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=314039#314039 Attachments: http://forums.matronics.com//files/j3300_wiring_a_319.jpg ________________________________ Message 13 ____________________________________ Time: 04:49:50 PM PST US Subject: AeroElectric-List: Comments J3300 exp bus wiring(smaller image) From: "ple190" Please comment smaller image Read this topic online here: http://forums.matronics.com/viewtopic.php?p=314042#314042 Attachments: http://forums.matronics.com//files/j3300_wiring_a1_985.jpg ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.