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Acoustic Regular Location: Hong Kong Registered: November 2003	Re: 20V extractor for sprinter? Sat, 04 June 2005 02:26 Hi Sam The formula is contained in a excel worksheet on my site in another link called xxx calculater. Did you find it? The various rpm optimization is simulated hence various lengths are recommended. Both 4-1 and 4-2-1 results are there. 2" is too big for secondaries. My quoted sizes are out diameter, sorry forgot to explain. The basic theory of octave lengths goes like this. If you have area "1" and length "A" to get higher one octave you'll need to shorted "A/2", to get one octave below you'll need "2xA" If your area increased to from "1" to "2" then the original length of "A" will need to be "4xA" in order to maintain the same frequency / rpm So, when you increased from 1.5" to 2" have an area of 989.789 versus 1772.055 respectively, which 2" is larger by 1.79 i.e. 79% larger - which is nearly 2 times. In this case when you make a shorter secondaries it will optimize for higher rpm - what frequency I do not know because lazy to work it out, I recon - very high too. Regardless, no matter how - a extractor is still a extractor it will still work. Just that weather you like the feel or not. I think. I'm going to invite another friend over to share his experience using larger OD all round as he told me the fabricator was so amazed with the power delivery everywhere that he kept making them for sale. Dam, just lost all my royalty there Hahahaha, oh well, it wasn't my formula to start of with [Report message to a moderator]

	Subject	Poster	Date
	20V extractor for sprinter?	JNR 13B	Tue, 31 May 2005 13:09
	Re: 20V extractor for sprinter?	Simon-AE86	Tue, 31 May 2005 13:17
	Re: 20V extractor for sprinter?	Simon-AE86	Tue, 31 May 2005 13:26
	Re: 20V extractor for sprinter?	JNR 13B	Tue, 31 May 2005 20:10
	Re: 20V extractor for sprinter?	cannonball	Wed, 01 June 2005 00:09
	Re: 20V extractor for sprinter?	JNR 13B	Wed, 01 June 2005 02:53
	Re: 20V extractor for sprinter?	Corona RT142	Wed, 01 June 2005 02:58
	Re: 20V extractor for sprinter?	JNR 13B	Wed, 01 June 2005 08:58
	Re: 20V extractor for sprinter?	Sam_Q	Thu, 02 June 2005 09:27
	Re: 20V extractor for sprinter?	JNR 13B	Thu, 02 June 2005 09:44
	Re: 20V extractor for sprinter?	Sam_Q	Thu, 02 June 2005 09:57
	Re: 20V extractor for sprinter?	Acoustic	Fri, 03 June 2005 09:19
	Re: 20V extractor for sprinter?	nightdevil	Fri, 03 June 2005 12:08
	Re: 20V extractor for sprinter?	Sam_Q	Fri, 03 June 2005 14:28
	Re: 20V extractor for sprinter?	monkeymajik	Fri, 03 June 2005 14:59
	Re: 20V extractor for sprinter?	Sam_Q	Fri, 03 June 2005 15:10
	Re: 20V extractor for sprinter?	Acoustic	Fri, 03 June 2005 17:28
	Re: 20V extractor for sprinter?	monkeymajik	Sat, 04 June 2005 00:46
	Re: 20V extractor for sprinter?	Sam_Q	Fri, 03 June 2005 22:32
	Re: 20V extractor for sprinter?	jkvsnn	Fri, 03 June 2005 23:17
	Re: 20V extractor for sprinter?	Sam_Q	Sat, 04 June 2005 01:34
	Re: 20V extractor for sprinter?	Acoustic	Sat, 04 June 2005 02:26
	Re: 20V extractor for sprinter?	TauhuTauhu	Sat, 04 June 2005 08:45
	Re: 20V extractor for sprinter?	Acoustic	Sat, 04 June 2005 10:48
	Re: 20V extractor for sprinter?	Acoustic	Sat, 04 June 2005 10:50
	Re: 20V extractor for sprinter?	TauhuTauhu	Sat, 04 June 2005 12:44
	Re: 20V extractor for sprinter?	toyotakia	Sat, 04 June 2005 23:55
	Re: 20V extractor for sprinter?	TauhuTauhu	Sun, 05 June 2005 13:33
	Re: 20V extractor for sprinter?	Sam_Q	Wed, 08 June 2005 09:18
	Re: 20V extractor for sprinter?	TauhuTauhu	Sat, 11 June 2005 20:42
	Re: 20V extractor for sprinter?	Steve-AE86	Sun, 12 June 2005 08:28
	Re: 20V extractor for sprinter?	shinybluesteel	Sun, 12 June 2005 08:36
	Re: 20V extractor for sprinter?	ae95	Sun, 12 June 2005 09:40
	Re: 20V extractor for sprinter?	Steve-AE86	Sun, 12 June 2005 10:26
	Re: 20V extractor for sprinter?	ae95	Sun, 12 June 2005 09:41
	Re: 20V extractor for sprinter?	ae95	Sun, 12 June 2005 10:31
	Re: 20V extractor for sprinter?	Sam_Q	Mon, 13 June 2005 03:28
	Re: 20V extractor for sprinter?	shinybluesteel	Mon, 13 June 2005 03:39
	Re: 20V extractor for sprinter?	Sam_Q	Mon, 13 June 2005 03:50
	Re: 20V extractor for sprinter?	irishtwincam	Tue, 21 June 2005 10:58
	kk	shinybluesteel	Tue, 21 June 2005 11:27
	Re: 20V extractor for sprinter?	Sam_Q	Wed, 13 July 2005 02:36

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