X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao107.cox.net ([68.230.241.39] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2047942 for flyrotary@lancaironline.net; Wed, 16 May 2007 13:38:12 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.39; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao107.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070516173731.BEKI13903.fed1rmmtao107.cox.net@fed1rmimpo02.cox.net> for ; Wed, 16 May 2007 13:37:31 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id ztdX1W00b1xAn3c0000000; Wed, 16 May 2007 13:37:32 -0400 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: Velocity 20B Date: Wed, 16 May 2007 10:37:49 -0800 Message-ID: <000001c797e9$4e74f390$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C797A6.4053FD80" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C797A6.4053FD80 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I was back in the air over the weekend with newly filtered EC2 board, = and a reduced pitch Catto prop. =20 All the settings in the EC2 that I can display are now remaining as they were set. That's a good thing, but there is still something wrong in controller A. The mixture gets leaner as I climb, and the only thing we = can figure out is something with the induction air temp sensor. Mine = originally came with the 10K thermistor sensor, and Tracy thinks the newer version = of the box I got last year may be looking for 3K thermistor. I wasn't = aware of the change, so maybe that's it - haven't figured that out yet. =20 Controller B works fine. =20 Lower pitch prop gives me about 400 more engine rpm at static run-up and climb, 600-700 more at WOT level. The acceleration on take off is very = good - from rolling start to about 65-70 kts in 1000-1100 ft, and mains come = off about 400 - 500 ft later (DA about 2000'). It will climb 1500 fpm as = soon as the gear comes up while burning about 19 gph. =20 Nice level cruise at 160 ktas and about 10 gph. High speed of 200 ktas = at 19 gph, 2970 rpm on the prop. Very smooth at any speed. Still calibrating fuel flow so the burn numbers may be a tad off. =20 Coolant temps are fine for any power - stay at about 180-190 climbout, = level cruise drop to 150-160; oil temps get marginally high (220F) in = sustained climb (after rapid climb to pattern altitude) so operational limit is = about 500 fpm with 85F OAT, and a bit more works at lower OAT. At cruise drops = to 180-185. Cooler oil temps in/out and air temps in/out shows that it is = air flow limited. At some point I will play with the wing root cooler exit fairing to see if it will enhance flow. =20 EGTs peak at about 1725F WOT, and run about 1650 cruise power (not = leaned, maybe close to stochoimetric). =20 This is all at a total weight of about 2100 lbs. =20 Al =20 ------=_NextPart_000_0001_01C797A6.4053FD80 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I was back in the air over the weekend with newly = filtered EC2 board, and a reduced pitch Catto prop.

 

All the settings in the EC2 that I can display are = now remaining as they were set.  That’s a good thing, but there = is still something wrong in controller A.  The mixture gets leaner as I = climb, and the only thing we can figure out is something with the induction air = temp sensor.  Mine originally came with the 10K thermistor sensor, and = Tracy thinks the newer version of the box I got last year may be looking for 3K = thermistor.  I wasn’t aware of the change, so maybe that’s it – = haven’t figured that out yet.

 

Controller B works fine.

 

Lower pitch prop gives me about 400 more engine rpm = at static run-up and climb, 600-700 more at WOT level.  The acceleration on take off is very good – = from rolling start to about 65-70 kts in 1000-1100 ft, and mains come off = about 400 - 500 ft later (DA about 2000’).  It will climb 1500 fpm as = soon as the gear comes up while burning about 19 = gph.

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Nice level = cruise at 160 ktas and about 10 gph. High speed of 200 ktas at 19 gph, 2970 rpm on = the prop.  Very smooth at any speed.  Still calibrating fuel flow = so the burn numbers may be a tad off.

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Coolant temps = are fine for any power – stay at about 180-190 climbout, level cruise drop = to 150-160; oil temps get marginally high (220F) in sustained climb (after = rapid climb to pattern altitude) so operational limit is about 500 fpm with = 85F OAT, and a bit more works at lower OAT. At cruise drops to = 180-185. Cooler oil temps in/out and air temps in/out shows that it is air flow limited. At = some point I will play with the wing root cooler exit fairing to see if it = will enhance flow.

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EGTs peak at = about 1725F WOT, and run about 1650 cruise power (not leaned, maybe close to = stochoimetric).

 <= /font>

This is all = at a total weight of about 2100 lbs.

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Al

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