X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost03.isp.att.net ([207.115.11.53] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3568707 for flyrotary@lancaironline.net; Thu, 02 Apr 2009 21:43:48 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.115.11.53; envelope-from=bobperk9@bellsouth.net DKIM-Signature: v=1; q=dns/txt; d=bellsouth.net; s=dkim01; i=bobperk9@bellsouth.net; a=rsa-sha256; c=relaxed/relaxed; t=1238723028; h=Content-Type:MIME-Version:In-Reply-To:Message-Id: Date:Subject:To:From; bh=HjidpnX462cRqyazF0A+QiCIfvo86D0NLmD9Y1q9WS g=; b=GBZmxlR4+ezfSg1WowFr8lvyVviY7nCB8C5DmD9P2S3Pc8GFunBbGARnUg6+M k/eLpoRMJCmlUhkrBQFb8BpAg== Received: from fwebmail05.isp.att.net ([207.115.11.155]) by isp.att.net (frfwmhc03) with SMTP id <20090403014313H0300q0l89e>; Fri, 3 Apr 2009 01:43:13 +0000 X-Originating-IP: [207.115.11.155] Received: from [74.249.250.29] by fwebmail05.isp.att.net; Fri, 03 Apr 2009 01:43:13 +0000 From: "Bob Perkinson" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Was; Video of First Flight - Mustang II Now: HOW DO THER DO THAT Date: Fri, 03 Apr 2009 01:43:13 +0000 Message-Id: <040320090143.6155.49D569B0000462530000180B22230682229B0A02D2089B9A019C04040A0DBFC7059D0A9F0D010D@att.net> In-Reply-To: X-Mailer: AT&T Message Center Version 1 (Mar 2 2009) X-Authenticated-Sender: Ym9icGVyazlAYmVsbHNvdXRoLm5ldA== MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_6155_1238722993_0" --NextPart_Webmail_9m3u9jl4l_6155_1238722993_0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable That sounds like percussion maintenance,I can understand that. Thanks Bob -------------- Original message from "Rogers, Bob J." := -------------- The designer and original manufacturer ofthe Mustang II kit, Bob Bushby, is= the one who published the procedure, whichis to protect the leading edge w= ith masking tape to avoid scratches and tap onthe outer leading edge with a= rubber (or other soft) mallet repeatedly until ameasurable rounding (or fl= attening) occurs. This is done carefully and slowly, alittle bit at a time= . The wing onthe Mustang II is thin and has a fairly sharp leading edge, w= hich makes theonset of a stall relatively sudden, compared to a Piper or RV= wing. A little rounding of the outer leadingedge will delay the separatio= n of airflow, leading to a lower stall speed. Of course, a more rounded l= eading edgehas more drag and causes a slight decrease in top end speed. On= e must seek a careful compromise. I am willing to sacrifice a couple ofkno= ts of speed for a plane that breaks straight ahead on stall. If I had buil= t the wings perfectly, I amsure that I would not have this problem. There i= s probably a slight difference in the twist (washout) or dihedralbetween th= e wings. The fix ispretty easy, all things considered. The wing drop was m= uch less severe on the second flight after an initialround of flattening. = I worked onthe right outer leading edge some more this weekend and expect t= o see it nearlyperfect on the next flight. This iswhy they call these airp= lanes EXPERIMENTAL. =20 From: Rotary motors in aircraft[mailto:flyrotary@lancaironline.net] OnBehal= f Of Bob Perkinson Sent: Tuesday, March 31, 2009 5:59PM To: Rotary motors in aircraft Subject: [FlyRotary] Was; Video ofFirst Flight - Mustang II Now: HOW DO THE= R DO THAT =20 Bob Not knowing how the Mustang wing is built I am curious as to how you arecha= nging the leading edge airfoil? Could you give a little more detail,or pos= t a link to an explanation of this procedure.=20 Curious Minds Want to Know Bob Perkinson Clean Clean DocumentEmail false false false = MicrosoftInternetExplorer4=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 Bill, =20 I came a little faster on my secondlanding (second flight) and greased it o= n. I am using the fix publishedby the Mustang II designer, Bob Bushby, in = an early newsletter, which is to make the leading edge of the outer 1/3 of = the wing that drops- more round, i.e. not as sharp. This allows the air to = flow over the leading edge more easily at higher anglesof attack without se= parating from the wing and lets the wing keep flyinglonger. After my initi= al re-work effort, the right wing drop at stall wasmuch less severe on the = second flight and the plane more stable leading up tothe stall. The right = wing still drops first, so I plan to continuerounding the outer leading edg= e of my right wing per Bob Bushby=E2=80=99s methoduntil both wings stall at= the same time. =20 The radiator and oil cooler are locatedbetween the engine and the firewall,= much like the Powersport installation http://powersportaviation.com/rv-6a_= n225ps.htm Here is a link to my engine installationbefore the baffling was installed t= hat forced all air to pass through theradiator and oil cooler before exitin= g the engine compartment. http://www.eaa1246.org/big_photo.asp?id=3DTurbo= %2Ejpg =20 Bob =20 --NextPart_Webmail_9m3u9jl4l_6155_1238722993_0 Content-Type: multipart/related; boundary="NextPart_Webmail_9m3u9jl4l_6155_1238722993_1" --NextPart_Webmail_9m3u9jl4l_6155_1238722993_1 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
=20 That sounds like percussion maintenance,I can understand that.

Thank= s Bob
 
-------------- Original message from "Rogers, Bob J." <BRogers@FDIC.gov= >: --------------

The designer a= nd original manufacturer of the Mustang II kit, Bob Bushby, is the one who published the procedure, whi= ch is to protect the leading edge with masking tape to avoid scratches and tap= on the outer leading edge with a rubber (or other soft) mallet repeatedly unti= l a measurable rounding (or flattening) occurs.  T= his is done carefully and slowly, a little bit at a time.  The wing on the Mustang II is thin and has a fairly sharp leading edge, which makes the onset of a stall relatively sudden, compared to a Piper or RV wing.  A little rounding of the outer leading edge will delay the separation of airflow, leading to a lower stall speed.<= span style=3D"">   Of course, a mo= re rounded leading edge has more drag and causes a slight decrease in top end speed.  One must seek a careful compromise.  = I am willing to sacrifice a couple of knots of speed for a plane that breaks straight ahead on stall.  If I had built the wings perfectly, I am sure that I would not have this problem.  There is probably a slight difference in the twist (washout) or dihe= dral between the wings.  The fix is pretty easy, all things considered.  The wing drop was much less severe on the second flight after an ini= tial round of flattening.  I worked on the right outer leading edge some more this weekend and expect to see it ne= arly perfect on the next flight.  This is why they call these airplanes EXPERIMENTAL.

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Bob Perkinson
Sent: Tuesday, March 31, 2= 009 5:59 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Was; = Video of First Flight - Mustang II Now: HOW DO THER DO THAT=

 

Bob
Not knowing how the Mustang wing is built I am curious as to how you are changing the leading edge airfoil?  Could you give a little more detai= l, or post a link to an explanation of this procedure.
Curious Minds Want to Know

Bob Perkinson



Bill,

 

I came a littl= e faster on my second landing (second flight) and greased it on.  I am using the fix publish= ed by the Mustang II designer, Bob Bushby, in an early newsletter, which is to make the leading edge of the= outer 1/3 of the wing that drops - more round, i.e. not as sharp.=   This allows the air to flow over the leading edge more easily at higher ang= les of attack without separating from the wing and lets the wing keep flying longer.  After my initial re-work effort, the right wing drop at stall= was much less severe on the second flight and the plane more stable leading up = to the stall.  The right wing still drops first, so I plan to continue rounding the outer leading edge of my right wing per Bob Bushby=E2=80=99s m= ethod until both wings stall at the same time.

 

The radiator a= nd oil cooler are located between the engine and the firewall, much like the Powersport installation = http://powerspor= taviation.com/rv-6a_n225ps.htm

Here is a link= to my engine installation before the baffling was installed that forced all air to pass through the radiator and oil cooler before exiting the engine compartment.   = http://ww= w.eaa1246.org/big_photo.asp?id=3DTurbo%2Ejpg=

 

Bob

 
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