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Spam> RE: SD-20 Alt performance chart?

 
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George W Braly



Joined: 09 Jan 2006
Posts: 15

PostPosted: Fri Feb 24, 2006 5:12 pm    Post subject: Spam> RE: SD-20 Alt performance chart? Reply with quote

Six cylinder vacuum pads that are on the same drive shaft as the
magnetos turn at 1.5 x crank RPM.

George

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aadamson(at)highrf.com
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PostPosted: Fri Feb 24, 2006 5:52 pm    Post subject: Spam> RE: SD-20 Alt performance chart? Reply with quote

Thanks George, so for 2500 RPM indicated engine speed, the vacuum pump pad
would be turning at 5000 rpm correct? That makes a little more sense.

Alan

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mprather(at)spro.net
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PostPosted: Fri Feb 24, 2006 6:43 pm    Post subject: Spam> RE: SD-20 Alt performance chart? Reply with quote

Err... Math in public isn't a good idea.. 2500 * 1.5 = 3750..
Matt-

[quote]
<aadamson(at)highrf.com>

Thanks George, so for 2500 RPM indicated engine speed, the vacuum pump
pad would be turning at 5000 rpm correct? That makes a little more
sense.

Alan

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Bob McC



Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

PostPosted: Fri Feb 24, 2006 6:56 pm    Post subject: Spam> RE: SD-20 Alt performance chart? Reply with quote

Alan

1.5 x 2500 = 3750 NOT 5000

Bob McC

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aadamson(at)highrf.com
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PostPosted: Fri Feb 24, 2006 7:50 pm    Post subject: Spam> RE: SD-20 Alt performance chart? Reply with quote

Now, guys... It's been a long day... Guess I can't even play the Markup vs.
Margin game on this one... Smile OR, can you, perhaps I did the divide by .5
instead of times by 1.5...

Sorry, you are right
Alan - tail between legs and going back to sanding... I knew I should have
even questioned 5000 rpm, let alone 7500 Smile

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