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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.227.161.51] (HELO qnsi-xch.qnsi.net) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 611880 for flyrotary@lancaironline.net; Fri, 22 Jul 2005 15:30:57 -0400 Received-SPF: none receiver=logan.com; client-ip=24.227.161.51; envelope-from=bhughes@qnsi.net Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C58EF4.7457C240" Subject: RE: [FlyRotary] Re: A - B conversion / speed mod test Disposition-Notification-To: "Bobby J. Hughes" X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Date: Fri, 22 Jul 2005 14:35:01 -0500 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: A - B conversion / speed mod test thread-index: AcWO8oSxNbi+v9jlRE+vgA4LDQqQugAAahcg From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C58EF4.7457C240 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Crisper roll response on a RV4?? That's scary! =20 Bobby (stated cutting $4k composite top for RV10...now that's really scary) ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Friday, July 22, 2005 2:15 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: A - B conversion / speed mod test =20 ----- Original Message -----=20 From: John Slade =20 To: Rotary motors in aircraft =20 Sent: Wednesday, July 20, 2005 6:44 PM Subject: [FlyRotary] Re: I must be crazy an A drive on that turbo engine? 46" of manifold pressure! =20 Oh my ache'n head. 46? You think I should cut it back all of 10 PSI? :) =20 OK. We did discuss this earlier, but I think it's time..... How much for the upgrade to B, and when can I have it? John =20 =20 Me and my big mouth - I'll have to figure that out after I get back from Osh.=20 =20 Won't be as expensive as a B to C conversion where all the guts are changed. That's about a kilobuck. =20 Flight tested the coil replacement and wingtip mod. Also put a temp probe near the coils to see what it was there. Yikes! 170 F. OAT was about 95 F. Alternator was probably seeing about the same. I think I recommended 135 F or less for both in the EC2 installation guide. I think the coil failure was my fault in this case, didn't follow my own rule. The higher under cowl temps are a result of the higher coolant temps on the Renesis. See website for details on this and why this does not mean you have to have a bigger rad.=20 =20 FWIW, I recently noticed on Laura's BMW that there is a blast tube feeding a shroud at the air inlet side of the alternator. Also noticed that at 130 mph it gets about 8 mpg while the RV-4 gets about 30 at the same speed, and that's down near sea level. Pretty amazing efficiency! =20 The wingtip mod is a keeper. I was too nervous about the coil & alternator temps to do extensive testing but if the improvement can be noticed at all, it's a good one. Most improvements are so small that it takes very careful measurements over several flights to be sure they are real. If the weather had been cool rather than hot I would not be so quick to say the improvement was real. =20 =20 Most speed mods offer very little benefit at climb & economy cruise settings but this one is different. In fact, the higher the AOA, the more this one helps. Roll response at low airspeed seems crisper too. =20 Tracy (installing cooling plenum for coils & alternator) ------_=_NextPart_001_01C58EF4.7457C240 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Crisper = roll response on=20 a RV4?? That's scary!

Bobby

(stated = cutting $4k=20 composite top for RV10...now that's really scary)

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy=20 Crook
Sent: Friday, July 22, 2005 2:15 PM
To: Rotary = motors=20 in aircraft
Subject: [FlyRotary] Re: A - B conversion / speed = mod=20 test

----- Original Message -----

From: John=20 Slade

To: Rotary motors in = aircraft

Sent: Wednesday, July 20, 2005 = 6:44=20 PM

Subject: [FlyRotary] Re: I must = be=20 crazy

an A drive on that turbo engine? 46" of manifold=20 pressure!

Oh my ache'n head.

46? You = think I should=20 cut it back all of 10 PSI? :)

OK. We did = discuss=20 this earlier, but I think it's time.....

How much = for the=20 upgrade to B, and when can I have it?

John

Me and my big mouth - I'll have to figure that out after I = get back=20 from Osh.

Won't be as expensive as a B to C conversion where all the = guts are=20 changed. That's about a kilobuck.

Flight tested the coil replacement and wingtip mod. = Also put=20 a temp probe near the coils to see what it was there.   = Yikes! =20 170 F. OAT was about 95 F. Alternator was probably seeing = about=20 the same.  I think I recommended 135 F or less for both = in the=20 EC2 installation guide. I think the coil failure was my fault in = this=20 case, didn't follow my own rule. The higher under cowl temps are = a=20 result of the higher coolant temps on the Renesis. See website = for=20 details on this and why this does not mean you have to have a bigger=20 rad.

FWIW, I recently noticed on Laura's BMW that there is a = blast tube=20 feeding a shroud at the air inlet side of the alternator. = Also=20 noticed that at 130 mph it gets about 8 mpg while the RV-4 gets about = 30 at=20 the same speed, and that's down near sea level. Pretty amazing=20 efficiency!

The wingtip mod is a keeper. I was too nervous about the = coil &=20 alternator temps to do extensive testing but if the improvement can be = noticed=20 at all, it's a good one.   Most improvements are so small = that it=20 takes very careful measurements over several flights to be sure they = are=20 real. If the weather had been cool rather than hot I would not = be so=20 quick to say the improvement was real.

Most speed mods offer very little benefit at climb & = economy=20 cruise settings but this one is different. In fact, the higher = the AOA,=20 the more this one helps.  Roll response at low airspeed = seems=20 crisper too.

Tracy (installing cooling plenum for coils &=20 alternator)

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