KR> Ignition switch
Paul Visk wrote: >>Did the switch fail because it was undersized for a DC circuit? I don't think so. It's supposed to be rated for 10A, and I was only pulling 5.1A through it, and one just like it (bought at the same time from AS) powered the same system on N56ML for all that time with zero problems. I think it was infant mortality...it literally rattles now, as if a contact broke completely loose inside. I borrowed the one from N56ML for now, but will install a 30A DC version shortly. I flew it almost every day last week, and the only reason I quit after only a half hour today is because it started hailing on me... Mark Langford ML at N56ML.com http://www.n56ml.com
KR> Ignition switch
Thank Mark for the reply. Give me something to think about.? Did the switch fail because it was undersized for a DC circuit? ? Sent on the new Sprint Network from my Samsung Galaxy S?4. Original message From: Mark Langford via KRnet Date:10/08/2014 8:02 PM (GMT-06:00) To: KRnet Subject: Re: KR> Ignition switch Paul Visk wrote: >> I was looking at WW's Critical Electrical System Diagram and thought of you when your ignition switch failed. Did both sides fail or just your primary side? WW has a DPDT switch fuel/coil on his design. I'm thinking this is a single point failure possibility. Wouldn't it be better to have two separate SPST switches to totally isolate the systems?<< Only one side failed...the beauty of a double pole switch...the two circuits are completely isolated from each other, except they are within one enclosure. I'm pretty sure WW got that idea from me...I did it first and he liked the idea, at least that's what he told me. You could use two SPST switches, but when you do that you have the possibility of having them both turned off at once...not good in a rapid-first highly tense situation where that could be overlooked, and you'd also be connecting fuel to ignition, rather than keeping them separated. You'd need four SPST switches to accomplish the same functionality, with an increase in human error potential. When I flip my switch I wouldn't even notice anything happened except the green LED turns RED (it's a bicolor). See http://www.n56ml.com/electrical/index.html to get the gist of how mine is done (although the bicolor LED isn't shown here). N56ML flew 1130 hours with this setup without a single hiccup. Since the bad switch incident, I now start the engine with the switch in the "backup" mode, so the ignition gets its juice from the backup battery, rather than the main circuit. This not only gives me a check of the backup battery, but it ensures the ignition system is getting a full 12.8V during starting, rather than "whatever is left over" when the starter has taken a huge bite out of the main battery power. Once it starts, I swap it over to "primary" to make that red LED go away, and continue to fly it that way until I land. Works for me! Of course the iEFIS also monitors and displays the voltage on both backup and main battery at all times anyway, so the main point is more juice to the ignition system and a check of the switch, rather than doing it on runup. -- Mark Langford ML at N56ML.com http://www.n56ml.com ___ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
KR> Tri-gear main wheel location
Update on moving the main wheels on my KR-2: Removed the main gear fiberglass struts. These are supposed to be used for a tail dragger version. Obtained Scotch ply Grumman Cougar blanks from Fletch Air. Planed these blanks from 1-inch down to 0.750-inch on my Craftsman wood power planer. Cut the blanks to size on my Craftsman metal cutting band saw. Used the original gear legs as patterns for the upper section of the leg and for match drilling to fit the old aluminum castings. Canted the lower leg to get essentially the same shape, but added the boomerang shape for the tri-gear; moved the end for the axle bracket 3-inches further aft. Rounded the edges and sanded smooth to get rid of saw marks and eliminate stress risers for these highly stressed parts. The new gear legs fit the original aluminum castings bolt holes precisely like the old legs. Now trying to fit up the axle brackets to get the 0-degree toe before drilling. Also need to wrap the legs with 2 BID fiberglass for better torsional strength, streamlining and plastic soda straw conduit for brake lines. The work is going slow, but so is the worker. Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA
KR> Ignition switch
Paul Visk wrote: >> I was looking at WW's Critical Electrical System Diagram and thought of you when your ignition switch failed. Did both sides fail or just your primary side? WW has a DPDT switch fuel/coil on his design. I'm thinking this is a single point failure possibility. Wouldn't it be better to have two separate SPST switches to totally isolate the systems?<< Only one side failed...the beauty of a double pole switch...the two circuits are completely isolated from each other, except they are within one enclosure. I'm pretty sure WW got that idea from me...I did it first and he liked the idea, at least that's what he told me. You could use two SPST switches, but when you do that you have the possibility of having them both turned off at once...not good in a rapid-first highly tense situation where that could be overlooked, and you'd also be connecting fuel to ignition, rather than keeping them separated. You'd need four SPST switches to accomplish the same functionality, with an increase in human error potential. When I flip my switch I wouldn't even notice anything happened except the green LED turns RED (it's a bicolor). See http://www.n56ml.com/electrical/index.html to get the gist of how mine is done (although the bicolor LED isn't shown here). N56ML flew 1130 hours with this setup without a single hiccup. Since the bad switch incident, I now start the engine with the switch in the "backup" mode, so the ignition gets its juice from the backup battery, rather than the main circuit. This not only gives me a check of the backup battery, but it ensures the ignition system is getting a full 12.8V during starting, rather than "whatever is left over" when the starter has taken a huge bite out of the main battery power. Once it starts, I swap it over to "primary" to make that red LED go away, and continue to fly it that way until I land. Works for me! Of course the iEFIS also monitors and displays the voltage on both backup and main battery at all times anyway, so the main point is more juice to the ignition system and a check of the switch, rather than doing it on runup. -- Mark Langford ML at N56ML.com http://www.n56ml.com
KR> Newsletters 168-214
Go to your library with a flash drive. Most libraries have internet access, so you can "research" the web site and download the content to the flash/thumb drive. If your library doesn't have it, check with a friend who has high speed access. You can find 2GB thumb drives for around $5 if you look - some sales content comes on flash drives with that much "free" space left on them. Just a suggestion. Mark W. N952MW (res.) -Original Message- From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Pat A. Shows via KRnet Sent: Wednesday, October 08, 2014 12:46 PM To: KRnet Subject: Re: KR> Newsletters 168-214 Mark is there any way some one who has dial-up can get the news letters on disk? I would gladly pay a fee. IHS PATS On Oct 8, 2014, at 10:33 AM, tinyauto--- via KRnet wrote: > > Thanks Mark and to all those involved in making this available! Though I will probably never build a KR, the knowledge in these newsletters apply to other builds. > > Kevin Golden > Harrisonville, MO > > > > > -Original Message- > From: Mark Langford via KRnet > To: KRnet > Sent: Tue, Oct 7, 2014 9:10 pm > Subject: KR> Newsletters 168-214 > > > More KR Newsletters are now posted at http://www.krnet.org/newsletter/ > , ssues 168-214, at the bottom of the list. Many thanks to several > folks ho contributed their pristine copies of the newsletters for this > ffort. There are more to come, but meantime, you've got a lot of > eading to do! I've come to realize that many of "my" great ideas > ctually came out of these newsletters over the years, and I missed a > ot of gems in there! These are a great resource of lessons learned, > mproved methods, performance reports, and generally good info > regarding very aspect of KR building and flying. Please take advantage of them... > -- > Mark Langford > L at N56ML.com > ttp://www.n56ml.com > > __ > earch the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > o UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > lease see other KRnet info at http://www.krnet.org/info.html ee > http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > ptions > > ___ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to > KRnet-leave at list.krnet.org please see other KRnet info at > http://www.krnet.org/info.html see > http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options ___ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com
KR> Ignition switch
Mark,? ? ? ?I ?was looking at WW's Critical Electrical System Diagram and though of you. ? ? ?When your ignition ?switch failed. ?Did both sides fail or just your primary side? ? ? WW has a DPDT switch fuel/coil on his design.? ? ? I'm thinking ?this is a single point failure possibility. ?Wouldn't it be better to have two separate SPST switches to totally isolate the systems? Paul Visk Belleville Il 618 406 4705 Sent on the new Sprint Network from my Samsung Galaxy S?4.
KR> Newsletters 168-214
The link should be imprinted on every set of plans... ? Paul KR2 NH - Original Message - From: "Mark Langford via KRnet" To: "KRnet" Sent: Tuesday, October 7, 2014 10:09:46 PM Subject: KR> Newsletters 168-214 "More KR Newsletters are now posted at http://www.krnet.org/newsletter/ , and generally good info regarding every aspect of KR building and flying. ?Please take advantage of them..." -- Mark Langford ML at N56ML.com http://www.n56ml.com ___ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
KR> Newsletters 168-214
Pat Shows wrote: >Mark is there any way some one who has dial-up can get the news letters on disk? I would gladly pay a fee. I was planning to do exactly that when I finish scanning them all, but if you want 2/3 of them now, send me your address and I'll get them to you... Mark Langford, Harvest, AL ML at N56ML.com www.N56ML.com
KR> Newsletters 168-214
Mark is there any way some one who has dial-up can get the news letters on disk? I would gladly pay a fee. IHS PATS On Oct 8, 2014, at 10:33 AM, tinyauto--- via KRnet wrote: > > Thanks Mark and to all those involved in making this available! Though I > will probably never build a KR, the knowledge in these newsletters apply to > other builds. > > Kevin Golden > Harrisonville, MO > > > > > -Original Message- > From: Mark Langford via KRnet > To: KRnet > Sent: Tue, Oct 7, 2014 9:10 pm > Subject: KR> Newsletters 168-214 > > > More KR Newsletters are now posted at http://www.krnet.org/newsletter/ , > ssues 168-214, at the bottom of the list. Many thanks to several folks > ho contributed their pristine copies of the newsletters for this > ffort. There are more to come, but meantime, you've got a lot of > eading to do! I've come to realize that many of "my" great ideas > ctually came out of these newsletters over the years, and I missed a > ot of gems in there! These are a great resource of lessons learned, > mproved methods, performance reports, and generally good info regarding > very aspect of KR building and flying. Please take advantage of them... > -- > Mark Langford > L at N56ML.com > ttp://www.n56ml.com > > __ > earch the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > o UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > lease see other KRnet info at http://www.krnet.org/info.html > ee http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > ptions > > ___ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options
KR> Newsletters 168-214
Thanks Mark and to all those involved in making this available! Though I will probably never build a KR, the knowledge in these newsletters apply to other builds. Kevin Golden Harrisonville, MO -Original Message- From: Mark Langford via KRnet To: KRnet Sent: Tue, Oct 7, 2014 9:10 pm Subject: KR> Newsletters 168-214 More KR Newsletters are now posted at http://www.krnet.org/newsletter/ , ssues 168-214, at the bottom of the list. Many thanks to several folks ho contributed their pristine copies of the newsletters for this ffort. There are more to come, but meantime, you've got a lot of eading to do! I've come to realize that many of "my" great ideas ctually came out of these newsletters over the years, and I missed a ot of gems in there! These are a great resource of lessons learned, mproved methods, performance reports, and generally good info regarding very aspect of KR building and flying. Please take advantage of them... -- Mark Langford L at N56ML.com ttp://www.n56ml.com __ earch the KRnet Archives at http://tugantek.com/archmailv2-kr/search. o UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org lease see other KRnet info at http://www.krnet.org/info.html ee http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change ptions
