Is this going to be on the exam?drseti wrote:The Rotax generator is really a cool design. (OK, I'll admit I'm a technology nerd.) They embed permanent magnets in the circumference of the flywheel. Thus, spinning magnetic field. Then, they place a total of seven stationary coils around the periphery of the flywheel housing. Since the coils are stationary, there's no need for slip rings or brushes.
The spinning magnetic field induces currents into the stationary coils. If you properly connect to a pair of coils spaced physically 180 degrees apart around the flywheel, you get a raw voltage. So, one pair of those coils generates power for one capacitive discharge ignition module. A second pair does the same for the other CDI module, and a third feeds the voltage regulator module that powers the main bus.
That leaves a single coil to produce a pulse of voltage each time the flywheel makes a revolution. And that pulse, students, drives the tachometer.
Pretty cool, no? Class dismissed.
Rotax 912iS or 912ULS for Sling 2 ???
Moderator: drseti
Re: Rotax 912iS or 912ULS for Sling 2 ???
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Re: Rotax 912iS or 912ULS for Sling 2 ???
No brushes IS a big deal in making magic smoke machines, kudos to the generator design folks.
"Don't believe everything you read on the internet" - Abraham Lincoln
Re: Rotax 912iS or 912ULS for Sling 2 ???
Just standby, one is coming. You can bet the farm on it!FastEddieB wrote: I came here for an argument!
Andy Walker
Athens, GA
Sport Pilot ASEL, LSRI
2007 Flight Design CTSW E-LSA
Athens, GA
Sport Pilot ASEL, LSRI
2007 Flight Design CTSW E-LSA
Re: Rotax 912iS or 912ULS for Sling 2 ???
No, Howard, this is a lab course. The final exam will consist of disassembling a Rotax generator down to its component parts, reassembling it, and successfully firing it up.Nomore767 wrote: Is this going to be on the exam?
The opinions posted are those of one CFI, and do not necessarily represent the FAA or its lawyers.
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Re: Rotax 912iS or 912ULS for Sling 2 ???
Now my Sling is equipped pretty much the same as Cam’s, less a chute and Cam has a Garmin Nav/Com between his dual screens. I have an internal GPS. TAF tells me I’m fine with the stock setup, no need to add the aux generator. Go figure! They could have sold it to me and I asked several times. So, we shall see.
My question to the Dr, if need be, can it be added later?
My question to the Dr, if need be, can it be added later?
Re: Rotax 912iS or 912ULS for Sling 2 ???
It's a fairly easy add-on, but will require an LoA if you're going the SLSA route. And, you'll have to redo wt/bal, since the extra wt on the gearbox pulls the CG forward a bit.
The opinions posted are those of one CFI, and do not necessarily represent the FAA or its lawyers.
Prof H Paul Shuch
PhD CFII DPE LSRM-A/GL/WS/PPC iRMT
AvSport LLC, KLHV
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Re: Rotax 912iS or 912ULS for Sling 2 ???
Good deal! Hope that works out.cam737 wrote:. . . The plan is to use a 40 amp external alternator.
Bill Ince
LSRI
Retired Heavy Equipment Operator
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Re: Rotax 912iS or 912ULS for Sling 2 ???
Paul, the coils that produce power for the generator and ignition are inside of the fly wheel not outside. There are 10 poles of which 2 are for powering the ignition. The other 8 are for generator power. There is only 1 pole for each side of the ignition.drseti wrote:The Rotax generator is really a cool design. (OK, I'll admit I'm a technology nerd.) They embed permanent magnets in the circumference of the flywheel. Thus, spinning magnetic field. Then, they place a total of seven stationary coils around the periphery of the flywheel housing. Since the coils are stationary, there's no need for slip rings or brushes.
The spinning magnetic field induces currents into the stationary coils. If you properly connect to a pair of coils spaced physically 180 degrees apart around the flywheel, you get a raw voltage. So, one pair of those coils generates power for one capacitive discharge ignition module. A second pair does the same for the other CDI module, and a third feeds the voltage regulator module that powers the main bus.
That leaves a single coil to produce a pulse of voltage each time the flywheel makes a revolution. And that pulse, students, drives the tachometer.
Pretty cool, no? Class dismissed.
Outside of the flywheel are two each triggering coils for each side of the ignition, a total of 4, and one triggering coil for the tachometer.
Re: Rotax 912iS or 912ULS for Sling 2 ???
cam737 wrote:Oh yeah. I knew that.
dr...my eyes are so glazed over I can barely type. But, I got through the first 2 sentences.
All you need to know is that if you can get up to 1.21 gigawatts you can do time travel........
Re: Rotax 912iS or 912ULS for Sling 2 ???
That's 1.21 gigajoules per second, Marty.WDD wrote:All you need to know is that if you can get up to 1.21 gigawatts you can do time travel........
The opinions posted are those of one CFI, and do not necessarily represent the FAA or its lawyers.
Prof H Paul Shuch
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AvSport LLC, KLHV
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Prof H Paul Shuch
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AvSport LLC, KLHV
[email protected]
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Re: Rotax 912iS or 912ULS for Sling 2 ???
Thanks for the corrections, Tom. Obviously, I was working from memory (I should have listened to Brian and pulled out the manual...)3Dreaming wrote:Paul, the coils that produce power for the generator and ignition are inside of the fly wheel not outside. There are 10 poles of which 2 are for powering the ignition. The other 8 are for generator power. There is only 1 pole for each side of the ignition.
Outside of the flywheel are two each triggering coils for each side of the ignition, a total of 4, and one triggering coil for the tachometer.
It's still a pretty cool design, isn't it?
The opinions posted are those of one CFI, and do not necessarily represent the FAA or its lawyers.
Prof H Paul Shuch
PhD CFII DPE LSRM-A/GL/WS/PPC iRMT
AvSport LLC, KLHV
[email protected]
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Prof H Paul Shuch
PhD CFII DPE LSRM-A/GL/WS/PPC iRMT
AvSport LLC, KLHV
[email protected]
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Re: Rotax 912iS or 912ULS for Sling 2 ???
Don't know about you, but in my Sling the "Flux Capacitor" is standard.WDD wrote:cam737 wrote:Oh yeah. I knew that.
dr...my eyes are so glazed over I can barely type. But, I got through the first 2 sentences.
All you need to know is that if you can get up to 1.21 gigawatts you can do time travel........
Re: Rotax 912iS or 912ULS for Sling 2 ???
Damn! I had to pay extra for mine, and still needed an LoA.Sling 2 Pilot wrote: Don't know about you, but in my Sling the "Flux Capacitor" is standard.
The opinions posted are those of one CFI, and do not necessarily represent the FAA or its lawyers.
Prof H Paul Shuch
PhD CFII DPE LSRM-A/GL/WS/PPC iRMT
AvSport LLC, KLHV
[email protected]
AvSport.org
facebook.com/SportFlying
SportPilotExaminer.US
Prof H Paul Shuch
PhD CFII DPE LSRM-A/GL/WS/PPC iRMT
AvSport LLC, KLHV
[email protected]
AvSport.org
facebook.com/SportFlying
SportPilotExaminer.US
Re: Rotax 912iS or 912ULS for Sling 2 ???
Jeez guys.....I thought it was all ball bearings?!!