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aadamson(at)highrf.com
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 Posted: Fri Feb 24, 2006 7:56 am Post subject: SD-20 Alt performance chart? |
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Bob, did you ever put together one of these for the SD-20? B&C specify 20A
output at 3500rpm, so I would assume that you could use the same "ratios"
and determine that on a continental for example, that is a 1.15:1, that
you'd have full output at 2900ish rpm?
http://www.aeroelectric.com/Reference_Docs/Alternator_Data/SD8-Performance.p
df
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nuckollsr(at)cox.net
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| Posted: Fri Feb 24, 2006 9:06 am Post subject: SD-20 Alt performance chart? |
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At 10:51 AM 2/24/2006 -0500, you wrote:
The SD-20 is an L-40 with different shoes. It's limited in output
only because of the reduced speed on the vacuum pump pad. It's
performance is described on B&C's website at:
http://bandc.biz/SD20REVC.pdf
Bob . . .
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aadamson(at)highrf.com
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| Posted: Fri Feb 24, 2006 9:35 am Post subject: SD-20 Alt performance chart? |
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Cuz the ignorance, but what ALT rpm would I expect to see on a continental
io-550 vacuum pad, when the engine is turning 2500 RPM?
Alan
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BobsV35B(at)aol.com
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| Posted: Fri Feb 24, 2006 12:48 pm Post subject: SD-20 Alt performance chart? |
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In a message dated 2/24/2006 11:37:58 A.M. Central Standard Time,
aadamson(at)highrf.com writes:
Cuz the ignorance, but what ALT rpm would I expect to see on a continental
io-550 vacuum pad, when the engine is turning 2500 RPM?
Alan
7500
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
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aadamson(at)highrf.com
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| Posted: Fri Feb 24, 2006 1:34 pm Post subject: SD-20 Alt performance chart? |
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Bob, does that make sense. 7500 would give almost 40amps out of the SD-20,
is a continental really 3:1 on the vacuum pad? Engine rpm 2500, vacuum pad
7500?
Alan
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BobsV35B(at)aol.com
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| Posted: Fri Feb 24, 2006 8:32 pm Post subject: SD-20 Alt performance chart? |
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Good Evening Alan,
I had my head up and locked when I responded. The regular alternator drive
on most 520 or 550 Continentals spins the alternator at three times crankshaft
speed. That is what I had in mind. The accessory drive that often runs the
vacuum pump will spin at one and a half times crankshaft speed on all six
cylinder Continentals.
Sorry, I goofed!
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
In a message dated 2/24/2006 6:58:53 P.M. Central Standard Time,
aadamson(at)highrf.com writes:
<aadamson(at)highrf.com>
Bob, does that make sense. 7500 would give almost 40 amps out of the SD-20,
is a continental really 3:1 on the vacuum pad? Engine rpm 2500, vacuum pad
7500?
Alan
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aadamson(at)highrf.com
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... I think we have it straight now tho...