---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 02/20/16: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:01 AM - Re: Starter engaged warning lights (Dale Ellis) 2. 08:55 AM - Re: Starter engaged warning lights (Robert L. Nuckolls, III) 3. 09:31 AM - Re: Starter engaged warning lights (Dale Ellis) 4. 10:07 AM - Re: Starter engaged warning lights (Robert L. Nuckolls, III) 5. 10:52 AM - Surplus whisky compass (Robert L. Nuckolls, III) 6. 11:02 AM - Re: Surplus whisky compass (Earl Schroeder) 7. 11:24 AM - Surplus whisky compass SOLD (Robert L. Nuckolls, III) 8. 12:59 PM - Re: Surplus whisky compass SOLD (Earl Schroeder) ________________________________ Message 1 _____________________________________ Time: 06:01:11 AM PST US Subject: Re: AeroElectric-List: Starter engaged warning lights From: Dale Ellis I added this feature to my RV-8 as omage to my former life as a Captain on a Dehavilland DHC-8 where the first item on the after-start check list was "START LIGHT -- OUT"!! Dale On Thursday, February 18, 2016, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > > Although relatively rare, having the starter and flywheel teeth jam > and break in flight might make for a "stormy night" story :-( > > > Not sure how much of a risk this is. > Every starter I'm aware of has an over-running > clutch built onto the pinion gear shaft. Hangar > myths about stuck pinions back driving a starter > and turning it into a generator are without > merit. Further, the solenoid/contactor configuration > of choice features a robust disengagement mechanism. > > The only 'unintentional engagements' I've > heard about over the last 20 years have > involved stuck contactors that kept the pinion > gear electrically engaged. One such case involved > a aerobatic performance airplane at OSH where > the entire routine was performed with the starter > engaged. > > While chewed up ring gears and pinons are ugly, > they don't represent much of a hazard to the engine > or airplane. > > The strongest prophylactic against these events > are a strong battery and a modern, stick-resistant > contactor. > > Most mechanical risk for pinion gear retraction > failure have foundation in poor maintenance . . . > a 'hard stick' is going to be preceded by a series > of tentative sticks. Just keep the shaft clean > and watch the pinion gear teeth for changes > in wear patterns. > > > Bob . . . > ________________________________ Message 2 _____________________________________ Time: 08:55:23 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Starter engaged warning lights At 07:59 AM 2/20/2016, you wrote: >I added this feature to my RV-8 as omage to my >former life as a Captain on a Dehavilland DHC-8 >where the first item on the after-start check list was "START LIGHT -- =C2 OUT"!! > >Dale Little different breed of cat there. On many turbine aircraft, the starter contactor on a series/shunt starter-generator needs to be confirmed open before a second contactor grabs armature output at the other end of the series field winding which is used only for starting. In this case, the starter-generator is always geared to the engine. That light is driven by a micro-switch built into the contactor's engagement hardware that verifies the contacts are open thereby extinguishing the light. Having that contactor stuck shut when the circuit is re-configured for generator service makes for some unhandy current flows in some rather fat wires. "Unhandy" current flows in fat wires can be a real PITA . . . Bob . . . ________________________________ Message 3 _____________________________________ Time: 09:31:26 AM PST US Subject: Re: AeroElectric-List: Starter engaged warning lights From: Dale Ellis Oh I agree Bob. I have no idea what the current inrush is when one of those starters is engaged, but it has to be a bunch. The lights would dim briefly when a starter was engaged and that was with the APU DC gen on line .. As I said, I added it more for nostalgia then anything else. Dale On Sat, Feb 20, 2016 at 11:53 AM, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 07:59 AM 2/20/2016, you wrote: > > I added this feature to my RV-8 as omage to my former life as a Captain o n > a Dehavilland DHC-8 where the first item on the after-start check list wa s > "START LIGHT -- =C3=82 OUT"!! > > Dale > > > Little different breed of cat there. On many turbine > aircraft, the starter contactor on a series/shunt > starter-generator needs to be confirmed open before > a second contactor grabs armature output at the > other end of the series field winding which is used > only for starting. > > In this case, the starter-generator is always > geared to the engine. > > That light is driven by a micro-switch built into > the contactor's engagement hardware that verifies > the contacts are open thereby extinguishing the > light. Having that contactor stuck shut when the > circuit is re-configured for generator service > makes for some unhandy current flows in some > rather fat wires. > > "Unhandy" current flows in fat wires can be a > real PITA . . . > > > Bob . . . > ________________________________ Message 4 _____________________________________ Time: 10:07:12 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Starter engaged warning lights At 11:29 AM 2/20/2016, you wrote: >Oh I agree Bob.=C2 I have no idea what the >current inrush is when one of those starters is >engaged, but it has to be a bunch.=C2 The lights >would dim briefly when a starter was engaged and >that was with the APU DC gen on line. > >As I said, I added it more for nostalgia then anything else. Understand. Inrush on a turbine engine is typically 1000A . . . Here's a plot taken from a Beech 400 (Beechjet/MU300) . . . real contact welder! Emacs! Thanks for the expansion! Bob . . . ________________________________ Message 5 _____________________________________ Time: 10:52:50 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Surplus whisky compass I've got an legacy whisky compass that is surplus to my plans. Magnets recharged, new gaskets, fresh fluid. Lettering is quite white. I'd like to get $60 + postage for it. Emacs! Bob . . . ________________________________ Message 6 _____________________________________ Time: 11:02:38 AM PST US Subject: Re: AeroElectric-List: Surplus whisky compass From: Earl Schroeder If it is still avil. I will buy it. Earl On Feb 20, 2016 12:59 PM, "Robert L. Nuckolls, III" < nuckolls.bob@aeroelectric.com> wrote: > > > I've got an legacy whisky compass that is surplus > to my plans. Magnets recharged, new gaskets, > fresh fluid. > > Lettering is quite white. I'd like to get > $60 + postage for it. > > > [image: Emacs!] > > Bob . . . > ________________________________ Message 7 _____________________________________ Time: 11:24:50 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Surplus whisky compass SOLD At 01:01 PM 2/20/2016, you wrote: >If it is still avil.=C2 I will buy it.=C2 Earl You've got it. I sent you a PayPal invoice . . . Bob . . . ________________________________ Message 8 _____________________________________ Time: 12:59:06 PM PST US Subject: Re: AeroElectric-List: Surplus whisky compass SOLD From: Earl Schroeder Should have now. Earl Schroeder. 5436 Saint Phillip Rd S. Evansville, IN. 47712 On Feb 20, 2016 1:29 PM, "Robert L. Nuckolls, III" < nuckolls.bob@aeroelectric.com> wrote: > > At 01:01 PM 2/20/2016, you wrote: > >> If it is still avil.=C3=82 I will buy it.=C3=82 Earl > > > You've got it. I sent you a PayPal invoice . . . > > > Bob . . . ------------------------------------------------------------------------------------- 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.