X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp101.vzn.mail.dcn.yahoo.com ([209.73.179.139] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with SMTP id 1124740 for flyrotary@lancaironline.net; Tue, 23 May 2006 10:02:32 -0400 Received-SPF: neutral receiver=logan.com; client-ip=209.73.179.139; envelope-from=pjmick@verizon.net Received: (qmail 69400 invoked from network); 23 May 2006 14:01:47 -0000 Received: from unknown (HELO ?192.168.1.44?) (pjmick@verizon.net@71.111.168.206 with plain) by smtp101.vzn.mail.dcn.yahoo.com with SMTP; 23 May 2006 14:01:47 -0000 Message-ID: <4473161B.9050908@verizon.net> Date: Tue, 23 May 2006 07:03:07 -0700 From: Perry Mick User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: 100LL plug fouling / MPG Content-Type: multipart/alternative; boundary="------------090502090002060107060300" This is a multi-part message in MIME format. --------------090502090002060107060300 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I wasn't thinking very clearly last night, it's pretty obvious that 175 / 6 is about 30 mpg. (29.2) If you are getting 0.47 lb/hr/HP, 6gph would work out to 76.6 HP, sounds reasonable at that altitude. What do you think your actual BSFC is under these conditions? If your mixture is about 17:1 lean and mine is 12:1 rich, that would correlate well with 29 vs 21 mpg. Perry Tracy wrote: Yes, my head (and main scale of ASI) is still calibrated in miles per hour. Yep, if you slowed down and were able to lean the mixture, your canard should do better MPG than my RV. Tracy ----- Original Message ----- From: Perry Mick To: Rotary motors in aircraft Sent: Tuesday, May 23, 2006 12:56 AM Subject: [FlyRotary] Re: 100LL plug fouling / MPG Tracy, just so we are on the same page, I assume you mean 175 MPH (not knots)? My data was taken between 10,500 and 12,500. It might be interesting to see what my fuel burn and MPG would be if I slowed it down to 175 MPH. Tracy wrote: About 30 mpg is what I currently see under best case conditions (12,500 - 14,500 MSL, 6.0 gph, 175 TAS). Interesting experiment on way back from Lumberton. 4 RVs departed for Florida Sunday AM, 3 Lyc powered and my rotary. The Lyc guys were taking too long to get packed up (I get antsy when I'm ready to go) so I left 15 minutes before they did and told them I would go slow and meet up on the way since we were flying the same flight plan. The Lyc guys flew at 8.5 GPH power setting and I flew at 6.0 GPH. Had head winds all the way but interesting part was that after 2.75 hr and 370 miles after my takeoff, the Lycs caught up to me. The extra speed of those 2.5 GPH really does not buy much! And I got to spend more time in my beloved airplane : ) Fun & Relaxing trip & fly-in BTW. Tracy (must get Ed's Gin & tonic formula) From: Perry Mick To: Rotary motors in aircraft Sent: Monday, May 22, 2006 12:33 PM Subject: [FlyRotary] 100LL plug fouling Al Wick might have got some of his "100LL in rotary" comments from my experience. I can't burn 100LL, it will foul my leading spark plugs after only 4 hours. That is because my engine runs rich-best power all the time. Of course running rich results in a higher fuel burn too. These days I'm doing about 160 knots on 8.8gph, or 184 mph @ 21 mpg. Burning mogas all the time, my leading spark plugs still only last about 50 to 60 hours. Trailings always look better. My 1988 RX-7 with exactly the same engine gets about 18.5 mpg combined city/hwy driving, probably low 20s if it was continuous freeway. If I had lean control I would expect results more like Ed Anderson with regard to 100LL and plug fouling. I would like to see some fliers express fuel usage in mpg, an easy way to compare efficiencies. For example, Tracy and Ed leaning might see 25 to 30 mpg? --------------090502090002060107060300 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit
I wasn't thinking very clearly last night, it's pretty obvious that 175 / 6 is about 30 mpg. (29.2)
If you are getting 0.47 lb/hr/HP, 6gph would work out to 76.6 HP, sounds reasonable at that altitude.
What do you think your actual BSFC is under these conditions?

If your mixture is about 17:1 lean and mine is 12:1 rich, that would correlate well with 29 vs 21 mpg.

Perry


Tracy wrote:

Yes, my head (and main scale of ASI) is still calibrated in miles per hour.
 
Yep, if you slowed down and were able to lean the mixture, your canard should do better MPG than my RV.
 
Tracy
----- Original Message -----
From: Perry Mick
Sent: Tuesday, May 23, 2006 12:56 AM
Subject: [FlyRotary] Re: 100LL plug fouling / MPG

Tracy, just so we are on the same page, I assume you mean 175 MPH (not knots)?
My data was taken between 10,500 and 12,500. It might be interesting to see what my fuel burn and MPG would be if I slowed it down to 175 MPH.
 

Tracy wrote:
 
About 30 mpg is what I currently see under best case conditions (12,500 - 14,500 MSL, 6.0 gph, 175 TAS).
 
Interesting experiment on way back from Lumberton.  4 RVs departed for Florida Sunday AM, 3 Lyc powered and my rotary.  The Lyc guys were taking too long to get packed up (I get antsy when I'm ready to go) so I left 15 minutes before they did and told them I would go slow and meet up on the way since we were flying the same flight plan.  The Lyc guys flew at 8.5 GPH power setting and I flew at 6.0 GPH.  Had head winds all the way but interesting part was that after 2.75 hr  and 370 miles after my takeoff, the Lycs caught up to me.   The extra speed of those 2.5 GPH really does not buy much!  And I got to spend more time in my beloved airplane : ) 
 
Fun & Relaxing trip & fly-in BTW.    
 
Tracy  (must get Ed's Gin & tonic formula)
From: Perry Mick
Sent: Monday, May 22, 2006 12:33 PM
Subject: [FlyRotary] 100LL plug fouling

Al Wick might have got some of his "100LL in rotary" comments from my experience.
I can't burn 100LL, it will foul my leading spark plugs after only 4 hours. That is because my engine runs rich-best power all the time. Of course running rich results in a higher fuel burn too. These days I'm doing about 160 knots on 8.8gph, or 184 mph @ 21 mpg.
Burning mogas all the time, my leading spark plugs still only last about 50 to 60 hours. Trailings always look better.
 
My 1988 RX-7 with exactly the same engine gets about 18.5 mpg combined city/hwy driving, probably low 20s if it was continuous freeway.
 
If I had lean control I would expect results more like Ed Anderson with regard to 100LL and plug fouling.
 
I would like to see some fliers express fuel usage in mpg, an easy way to compare efficiencies. For example, Tracy and Ed leaning might see 25 to 30 mpg?
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