good explanation on the wire-locking! I have had workmates asking again and again about why you should twist the ending in the opposite direction and I told them exactly the same.
I'm the guy from Cyprus.Yes Cyprus is the kind of place to settle down...but it's nice to see the world too.It definitely does not get near as cold here as it does where you are but AgentJZ...you are a global hero...I watch all your videos ...just as I used to watch aviation videos on the Wright Brothers back in the mid 70's.
In all Rc Helicopters, there is a disengaging mechanism which let's the rotor spin free to autorotate.I would therefore assume with most certainty that real helicopters definitely have that too,so when the engine is brought to idle the rotor spins free.The more economic version is the one way bearing and the better choice is the sprag wheel...which comes in one unit and has a normal bearing in parallel.One way bearings jam if greased or use very thin oil.
Difference between a sprag clutch and a one one way bearing which we have on our rc Helis ?I run the one way bearings with absolutely no grease otherwise the one way bearings don't work...
@heligeorge Interesting. The Bell 206 we crawled all over in training used a sprag between the engine and main gearbox in order to allow instant transition to autorotation in the event of power loss.
@heligeorge One-way bearings is a synonym for sprag clutch. The one way bearing in my T-Rex 600 is greased and works fine! (The kit actually ships with a tube of one-way bearing grease, and if you buy a spare, they often come with some grease already in them)
May be coz the rotation of the starter and the threads of the screw is of opposit to each other, by the time the starter starts it will force it to be in place because of the centrifugal force of the rotation of the starter. by that means the screw wont unscrew it self under the starter is up and running. So may be thats why it is of "wrong" threaded screw, i might be 100% wrong here but just my thought sir. U see since it doesnt even have to be torqued that much.
@c4fishfood Good suggestion, but that would only keep one piece in place, wouldn't it? The spline is a captive part, so it can't go anywhere even if it is in a hundred pieces. The screw is there mainly so the spline does not fall out while the starter is being handled while not installed on an engine.
@mikeallenbrown1 as explained earlier, the screw has no function except to keep the spline adapter with the starter when it is not installed on an engine.
When the starter is installed, and when it is in use, if the screw were not there, everything would function normally.
@AgentJayZ oh ok, I see what you are saying now. Love the videos BTW. I'm a tech by trade but what I work on isn't nearly as complicated as turbines. Keep them coming! :)
Jay, your channel is like the "This old house" of jet engine repair. You should get some sponsors. Great Job again, keep up the good work. Is the cut off you mentioned triggered by air pressure or something else.
@joelvh1 The cutoff is electrical. It is a small generator that makes just enough power at cutout rpm to trip a relay that is connected to the start cart and causes it to close the valve that is supplying air to the starter.
Hey AgentJayZ, greetings from Cyprus,the tiny Mediterranean island.You cannot imagine how glad I am to really know all about turbines.Thank you for your videos and please try to keep some good stuff coming over during the cold winter.
@heligeorge ... Ahem... I need to ask you serially: What is a cold winter on Cyprus ? Isn't the Mediterranean the birthplace of civilization because it's just such a fantastically nice climate that it's just where people, for the first time ever, decided to stop moving and just settle down ?
Up here, a cold winter means: if you're outside and you stop moving... you die.
Thank you for the effort you put into making these videos. They are very informative! I know I told you a few months ago that I would "elaborate" about mechanical seals in centrifugal pumps (in response to your video on seals). I haven't forgotten, just can't seem to find the time and energy to do it. I promise to do it soon though, since I got some nice new tungsten carbide seals waiting to be shown to the world!
I have those same safety wire pliers! Love'em! I remember you testing these starters, what was the deal with sparks coming out of them? Bad bearings? Neat unit, looks pretty powerful. Let's mount one to drive a go kart and for input air, fab up a LOX/Methnol combustor!
@mytmousemalibu A couple of the sparking tests were due to bad bearings, and they were replaced. A couple were more serious, and sadly they had to be put down. These starters are not as powerful as the radial inflow Garrett model that we use for our test engines. They put out 285 lb-ft of torque at 0 rpm, and by the time they get to cutout, it's under 20 lb-ft. And they don't like air hotter than 350 degrees.
@AgentJayZ They have some grunt down low! That Garrett is a beast! I wouldn't have guessed it has an inclination to tempature, somthing to do with thermal expansion/interferance? Since starters is the subject, I happened to be in our turbine shop this eve, and we have a bunch of Garrett turbine engines that look identical to the unit in your start cart! Just for kicks we also have: 2 PT6's , Allison 250, JT8D, Boeing T50, Westinghouse J30, <-- some jet heritage right there!
I was a bit surprised at the use of grease in that unit. Especially the sealed bearings. Most bearings are rated for a lower speed with grease as opposed to oil, and 42K RPM's is pretty high for bearings that size. I'm sure duty cycle plays a big part in it though. I re-watched the Garrett radial inflow starter video, I see that one uses standard MIL-L-7808 oil. Thanks again Jay!
@AgentJayZ That's similar in my line of work. Semis and trailers usually have oil lubricating the wheel bearings, but some of the really heavy duty stuff such as dump trucks, crane trucks, cement mixers etc. have grease hubs. When an oil hub starts leaking for whatever reason, it requires immediate attention. Grease hubs on the other hand can go for a little while before needing repairs.
good explanation on the wire-locking! I have had workmates asking again and again about why you should twist the ending in the opposite direction and I told them exactly the same.
theturbofantastic 1 month ago
Dude you are the man!. Thanks for taking the time to share your experience. May god bless you.
karthik86c 1 month ago
Your call :-)
heligeorge 2 months ago
I'm the guy from Cyprus.Yes Cyprus is the kind of place to settle down...but it's nice to see the world too.It definitely does not get near as cold here as it does where you are but AgentJZ...you are a global hero...I watch all your videos ...just as I used to watch aviation videos on the Wright Brothers back in the mid 70's.
heligeorge 2 months ago
@heligeorge Cyprus... When do I get to come for a visit?
AgentJayZ 2 months ago
In all Rc Helicopters, there is a disengaging mechanism which let's the rotor spin free to autorotate.I would therefore assume with most certainty that real helicopters definitely have that too,so when the engine is brought to idle the rotor spins free.The more economic version is the one way bearing and the better choice is the sprag wheel...which comes in one unit and has a normal bearing in parallel.One way bearings jam if greased or use very thin oil.
heligeorge 2 months ago
Difference between a sprag clutch and a one one way bearing which we have on our rc Helis ?I run the one way bearings with absolutely no grease otherwise the one way bearings don't work...
heligeorge 2 months ago
@heligeorge Interesting. The Bell 206 we crawled all over in training used a sprag between the engine and main gearbox in order to allow instant transition to autorotation in the event of power loss.
AgentJayZ 2 months ago
@heligeorge One-way bearings is a synonym for sprag clutch. The one way bearing in my T-Rex 600 is greased and works fine! (The kit actually ships with a tube of one-way bearing grease, and if you buy a spare, they often come with some grease already in them)
74HC138 3 weeks ago
No thankyouuuuuu JayZ youre my hero !
zero00tolerance 2 months ago
wonderfull indeed, thank you
TheAikisurf 3 months ago
thanks
bemaco 3 months ago in playlist Uploaded videos
May be coz the rotation of the starter and the threads of the screw is of opposit to each other, by the time the starter starts it will force it to be in place because of the centrifugal force of the rotation of the starter. by that means the screw wont unscrew it self under the starter is up and running. So may be thats why it is of "wrong" threaded screw, i might be 100% wrong here but just my thought sir. U see since it doesnt even have to be torqued that much.
KEZJ01 4 months ago
@KEZJ01 As I explain in the video, there is no load ever placed on the screw. It takse no part in transmitting torque to the engine.
AgentJayZ 4 months ago
@AgentJayZ nice video- could the screw be to keep the spline in place if it does shear?
c4fishfood 4 months ago
@c4fishfood Good suggestion, but that would only keep one piece in place, wouldn't it? The spline is a captive part, so it can't go anywhere even if it is in a hundred pieces. The screw is there mainly so the spline does not fall out while the starter is being handled while not installed on an engine.
AgentJayZ 4 months ago
@AgentJayZ The screw tightens counterclockwise making it self tightening, it won't back out since the spline spins clockwise.
mikeallenbrown1 2 months ago
@mikeallenbrown1 as explained earlier, the screw has no function except to keep the spline adapter with the starter when it is not installed on an engine.
When the starter is installed, and when it is in use, if the screw were not there, everything would function normally.
AgentJayZ 2 months ago
@AgentJayZ oh ok, I see what you are saying now. Love the videos BTW. I'm a tech by trade but what I work on isn't nearly as complicated as turbines. Keep them coming! :)
mikeallenbrown1 2 months ago
Very informative and clear explanations! Thanks!
Bamchucknorris 4 months ago
Please keep making these videos, they are amazing!
FlightSimTutorials 4 months ago
I find myself clicking "like" several times during the whole video.
(That's how much I like them)
Bichoicho 4 months ago
@Bichoicho Thanks!
AgentJayZ 4 months ago
You have no idea how much i have learnt from your channel. You have such a great channel. Very very good job sir.
KEZJ01 4 months ago 7
@KEZJ01 Thanks!
AgentJayZ 4 months ago
Jay, your channel is like the "This old house" of jet engine repair. You should get some sponsors. Great Job again, keep up the good work. Is the cut off you mentioned triggered by air pressure or something else.
joelvh1 5 months ago
@joelvh1 The cutoff is electrical. It is a small generator that makes just enough power at cutout rpm to trip a relay that is connected to the start cart and causes it to close the valve that is supplying air to the starter.
Sponsors ? Send me bacon money !
AgentJayZ 5 months ago
Yet another great video. Question, how to you get all that old grease off off those parts?
saxonlight 5 months ago
@saxonlight Answer:the same way you clean off any slimy, greasy part... you use solvent, brushes, rags... and elbow grease :)
I could show the entire procedure, but it would be 90 minutes of tediosity.... this is exciting as I could make it, really!
AgentJayZ 5 months ago
@AgentJayZ haha So no fancy ultrasonic degrease machine? :)
saxonlight 5 months ago
@saxonlight We've got a couple of those, but the heavy stuff is removed by hand.
AgentJayZ 5 months ago
@AgentJayZ Very nice. Thanks again for the video AJZ. Looking forward to more. =)
saxonlight 5 months ago
The shop being so empty lately, when are you going to work on the Orenda?
indoorherbivore 5 months ago
Thank you very much...
swamiontube 5 months ago
Hey AgentJayZ, greetings from Cyprus,the tiny Mediterranean island.You cannot imagine how glad I am to really know all about turbines.Thank you for your videos and please try to keep some good stuff coming over during the cold winter.
heligeorge 5 months ago
@heligeorge ... Ahem... I need to ask you serially: What is a cold winter on Cyprus ? Isn't the Mediterranean the birthplace of civilization because it's just such a fantastically nice climate that it's just where people, for the first time ever, decided to stop moving and just settle down ?
Up here, a cold winter means: if you're outside and you stop moving... you die.
AgentJayZ 5 months ago
@TheElectricnoob Stainless steel
AgentJayZ 5 months ago
That was one of your best yet. Well edited and very good commentary. Cheers.
matube73 5 months ago
Thank you for the effort you put into making these videos. They are very informative! I know I told you a few months ago that I would "elaborate" about mechanical seals in centrifugal pumps (in response to your video on seals). I haven't forgotten, just can't seem to find the time and energy to do it. I promise to do it soon though, since I got some nice new tungsten carbide seals waiting to be shown to the world!
NecroGoldevil 5 months ago
I question the function of that grease after more than a couple starts. Based on the one you took apart it looks almost dry where it counts.
oisiaa 5 months ago
Fascinating stuff. I find myself thinking that if you were making these videos 20 years ago, I may have had a very different career path.
mekman 5 months ago
Thank You for The Education! Just Awesome!
poppopscarvinshop 5 months ago
About how many operating hours does a greasing keep it happy?
LarryCanFly 5 months ago
@LarryCanFly The manual says 400 hours...
AgentJayZ 5 months ago
I have those same safety wire pliers! Love'em! I remember you testing these starters, what was the deal with sparks coming out of them? Bad bearings? Neat unit, looks pretty powerful. Let's mount one to drive a go kart and for input air, fab up a LOX/Methnol combustor!
mytmousemalibu 5 months ago
@mytmousemalibu A couple of the sparking tests were due to bad bearings, and they were replaced. A couple were more serious, and sadly they had to be put down. These starters are not as powerful as the radial inflow Garrett model that we use for our test engines. They put out 285 lb-ft of torque at 0 rpm, and by the time they get to cutout, it's under 20 lb-ft. And they don't like air hotter than 350 degrees.
AgentJayZ 4 months ago
@AgentJayZ They have some grunt down low! That Garrett is a beast! I wouldn't have guessed it has an inclination to tempature, somthing to do with thermal expansion/interferance? Since starters is the subject, I happened to be in our turbine shop this eve, and we have a bunch of Garrett turbine engines that look identical to the unit in your start cart! Just for kicks we also have: 2 PT6's , Allison 250, JT8D, Boeing T50, Westinghouse J30, <-- some jet heritage right there!
mytmousemalibu 4 months ago
thank you jayz for an another resourceful video... :):):)
aakarsh5292 5 months ago
Great video as always!
TheChrisMuncy 5 months ago
I was a bit surprised at the use of grease in that unit. Especially the sealed bearings. Most bearings are rated for a lower speed with grease as opposed to oil, and 42K RPM's is pretty high for bearings that size. I'm sure duty cycle plays a big part in it though. I re-watched the Garrett radial inflow starter video, I see that one uses standard MIL-L-7808 oil. Thanks again Jay!
Fierobsessed 5 months ago
@Fierobsessed This is an earlier design, and it seems simplicity of operation in the field was a priority.
Nothing to drain and nothing to add, so it was impossible to run dry and have an "incident".
AgentJayZ 5 months ago
@AgentJayZ That's similar in my line of work. Semis and trailers usually have oil lubricating the wheel bearings, but some of the really heavy duty stuff such as dump trucks, crane trucks, cement mixers etc. have grease hubs. When an oil hub starts leaking for whatever reason, it requires immediate attention. Grease hubs on the other hand can go for a little while before needing repairs.
hopper1 5 months ago
Awesome video as usual.
JayJr2007 5 months ago 2