X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 12 Dec 2013 16:56:12 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-spurfowl.atl.sa.earthlink.net ([209.86.89.66] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTP id 6636814 for lml@lancaironline.net; Thu, 12 Dec 2013 16:46:19 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.66; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=Wy1kLn1+x9tx6crrubH2b5BhvPRAuhNCXrN9NufCKI1B9tJYBp8BSLk+sXUdPB/k; h=Received:From:To:Cc:References:In-Reply-To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Content-Language:Thread-Index:X-ELNK-Trace:X-Originating-IP; Received: from [67.8.30.30] (helo=DougsVAIO) by elasmtp-spurfowl.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1VrE4h-0005DK-0D; Thu, 12 Dec 2013 16:45:39 -0500 From: "Douglas Brunner" X-Original-To: "'Lancair Mailing List'" X-Original-Cc: "Carlo Cilliers" , "Harry Hinckley" , "'Elle Ringwalt'" , "'Blair Andrew'" References: In-Reply-To: Subject: Gap Seal Update X-Original-Date: Thu, 12 Dec 2013 16:45:40 -0500 X-Original-Message-ID: <00be01cef783$80f50200$82df0600$@net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00BF_01CEF759.981EFA00" X-Mailer: Microsoft Office Outlook 12.0 Content-Language: en-us Thread-Index: Ac72mralYFB6GmhISbCOICif2JrSRAA5j+QA X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac0eab4a5d23dc2aa85039f8685bbc0a488b2dec884220b2cb3350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 67.8.30.30 This is a multi-part message in MIME format. ------=_NextPart_000_00BF_01CEF759.981EFA00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I flew this afternoon and tested the effect of my "speed mods". See below: Legacy Speed Test Heading Ground Speed Date 12/9/13 30 252 Alt 8,000 ft OAT 63 Deg. F 300 232 RPM 2,600 MAP 23.3 inches 210 221 Fuel Flow 18.5 GPH Peak EGT 1,275 Deg. F 120 242 EGT 1,175 Deg. F 236.75 kts Legacy Speed Test Heading Ground Speed Date 12/12/13 30 238 Alt 8,000 ft OAT 51 Deg. F 300 221 RPM 2,600 MAP 23.4 inches 210 242 Fuel Flow 18.7 GPH Peak EGT 1,290 Deg. F 120 261 EGT 1,190 Deg. F 240.5 kts The only difference between the runs, other than the speed mods was that it was 11 deg. cooler with resultant increase in MAP and Fuel Flow. Not sure how to interpret the temp difference. Obviously the engine made more HP, on the other hand the air was thicker. Even tradeoff? Here are the speed mods I made: a) Gap Seals: 1) Both sides of Rudder 2) Upper and lower Elevator 3) Upper and lower Flaps b) Antenna base fairings with RTV c) Various seams and interfaces with RTV and/or Tape Overall, I am fairly pleased with the results - although it took longer than I thought and I spent way too much time on my back on a creeper. One minor drawback - when flaps are deployed my airplane "sings" to me. High pitched humming sound - not objectionable. In fact it could be considered a safety feature! I think I am going to try it again to see if I can get more. Here are my candidate improvements: d) Flap hinge fairings - there has got to be a couple of knots with those e) Bottom of ailerons - I have been told that there is a knot there f) My speedbrakes are slightly recessed and some of the screws are "boogered" or stand proud. If I get them flush and smooth the screws that might be worth something. As always comments, suggestions, expressions of incredulity, and explanations as to why the only reason for the increased speed is the decreased air temp. are welcome! D. Brunner N241DB ------=_NextPart_000_00BF_01CEF759.981EFA00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I flew this afternoon and tested the effect of my “speed = mods”.  See below:

 

Legacy Speed Test

 

 

 

 

 

 

 

 

 

 

 

 

 

Heading

 

Ground = Speed

 

Date = 12/9/13

 

 

 

 

 

 

 

 

 

 

30

 

252

 

Alt

8,000=

ft

 

 

 

 

 

OAT

63

Deg. F

 

300

 

232

 

RPM

2,600=

 

 

 

 

 

 

MAP

23.3<= /span>

inches

 

210

 

221

 

Fuel = Flow

18.5<= /span>

GPH

 

 

 

 

 

Peak = EGT

1,275=

Deg. F

 

120

 

242

 

EGT

1,175=

Deg. F

 

 

 

 

 

 

 

 

 

 

 

236.75

kts

 

 

 

 

 

 

 

 

 

 

 

Legacy Speed Test

 

 

 

 

 

 

 

 

 

 

 

 

 

Heading

 

Ground = Speed

 

Date = 12/12/13

 

 

 

 

 

 

 

 

 

 

30

 

238

 

Alt

8,000=

ft

 

 

 

 

 

OAT

51

Deg. F

 

300

 

221

 

RPM

2,600=

 

 

 

 

 

 

MAP

23.4<= /span>

inches

 

210

 

242

 

Fuel = Flow

18.7<= /span>

GPH

 

 

 

 

 

Peak = EGT

1,290=

Deg. F

 

120

 

261

 

EGT

1,190=

Deg. F

 

 

 

 

 

 

 

 

 

 

 

240.5=

kts

 

 

 

 

The only difference between the runs, other than the speed mods was = that it was 11 deg. cooler with resultant increase in MAP and Fuel = Flow.  Not sure how to interpret the temp difference.  = Obviously the engine made more HP, on the other hand the air was = thicker.  Even tradeoff?

 

Here are the speed mods I made:

 

a)      = Gap Seals:

1)      = Both sides of Rudder

2)      = Upper and lower Elevator

3)      = Upper and lower Flaps

b)      = Antenna base fairings with RTV

c)       = Various seams and interfaces with RTV and/or = Tape

 

Overall, I am fairly pleased with the results – although it = took longer than I thought and I spent way too much time on my back on a = creeper.

 

One minor drawback – when flaps are deployed my airplane = “sings” to me.  High pitched humming sound – not = objectionable.  In fact it could be considered a safety = feature!

 

I think I am going to try it again to see if I can get more.  = Here are my candidate improvements:

 

d)      = Flap hinge fairings – there has got to be a couple of knots = with those

e)      = Bottom of ailerons – I have been told that there is a knot = there

f)       = My speedbrakes are slightly recessed and some of the screws are = “boogered” or stand proud.  If I get them flush and = smooth the screws that might be worth something.

 

As always comments, suggestions, expressions of incredulity, and = explanations as to why the only reason for the increased speed is the = decreased air temp. are welcome!

 

D. Brunner

N241DB

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