X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 02 Mar 2011 07:58:48 -0500 Message-ID: X-Original-Return-Path: Received: from mail-qy0-f180.google.com ([209.85.216.180] verified) by logan.com (CommuniGate Pro SMTP 5.4c2o) with ESMTPS id 4887002 for lml@lancaironline.net; Tue, 01 Mar 2011 15:55:27 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.216.180; envelope-from=keith.smith@gmail.com Received: by qyk10 with SMTP id 10so5180010qyk.4 for ; Tue, 01 Mar 2011 12:54:52 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=R9CXy2bIeuMW+BWkhNds5ltltHl8TORSnfY1pY3Im27F+LgigFQ7krm92yK7TzPYXN TQQGqo2c7rQRbKjOn6KzMCXwcL1Z8+B0HG8dIIsVVwhGzxi5qMFZACg0Vo8tWF8OJHrf ANTqxMaGVgsZYGS/nS1wrEyvQVqYBDYHog/b0= MIME-Version: 1.0 Received: by 10.229.101.206 with SMTP id d14mr5865983qco.32.1299012892620; Tue, 01 Mar 2011 12:54:52 -0800 (PST) Received: by 10.229.77.65 with HTTP; Tue, 1 Mar 2011 12:54:52 -0800 (PST) In-Reply-To: References: X-Original-Date: Tue, 1 Mar 2011 15:54:52 -0500 X-Original-Message-ID: Subject: Re: [LML] Re: GPS Speed (Lancair 320): 272 KTS (313 MPH) From: Keith Smith X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=001636426a0b05fa9d049d7202a0 --001636426a0b05fa9d049d7202a0 Content-Type: text/plain; charset=ISO-8859-1 Thanks, Lorn, I have the small-tail 360. I'm guessing that 197ktas is probably one of the slower examples. I think Rick Argente's 360 is good for about 205ktas if memory serves. I was parked on the ramp at Statesboro, GA when a Lo Presti employee walked over after climbing out of his Mooney. "Ohhhh the things I could do to this plane," he said :) He was practically drooling and reaching for glass fab tools right there and then. I finished up and said, "I'm dead serious, you need to get this plane to our facility, we would much rather work on this than put 'speed mods' on a Cherokee!" One very tangible item that he mentioned right out of the gate was an extension for the ram air intake to bring it within a inch of the back of the prop. He says that the pressure recovery you get from the ram air system is that much better as you move the intake closer to the prop. He then examined the underside of the wing and recommended some tape for the flaps, saying there wasn't much that could done on the ailerons. Interesting experience. I'm happy with how it flies, but if time and money ever permit, I will look at a plenum or better baffling, as I read Chris' articles on cooling drag prior to buying the 360, and then perhaps taking it to Lo Presti to see what they would do with it. Keith On Tue, Mar 1, 2011 at 3:19 PM, Lorn H Olsen wrote: > Keith, > > I normally fly at 160 kts ias at 7,500 ft. This would be about 184 kts tas > ((1+.075*2)*160). This is at 2,350 rpm, 23.5" mp & 7.5 gph. > > When I go up to 2,550 rpm, full throttle & 8.5 gph, my speed goes up to 170 > kts ias or about 195 kts tas. I have a standard 160 hp O-320 w/Aero > Composites carbon prop. > > My data corresponds to the following CAFE report: > > > > > The 360 is supposed to be 10 kts faster than the 320. Your data confirms > that. > > I believe that my prop increases my speed by about 5 kts tas. > > Lorn > > Here is the Lancair 320 Per > > > From: Keith Smith > > Date: February 28, 2011 7:19:31 PM EST > > > > I posted those Lancair 360 speeds. I'm well aware that GS is not > representative of aircraft performance, but it's also a guilty pleasure to > track 'em :) > > > > One figure I'm truly interested in is what the maximum sustained true > airspeed is in level flight for various Lancair 360s. I know my plane is > good for 197ktas with me in it...no more and no less. I actually use that > information as a gauge for how the plane is doing on any given day. One day > I was getting 202, sustained for a few minutes in level flight. That got my > attention. It turned out to be a very slight updraft. I paid the piper later > on, though, entering a similar downdraft, taking me down to around 185ktas. > > > > Groundspeeds are fun to giggle over. True airspeed in level flight is > something to admire. I'm guessing the cleanest 360's with 180hp power plants > are good for around 205ktas, perhaps? > > > > Keith > > -- > Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst > DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us > LNC2, FB90/92, O-320-D1F, 1,790 hrs, N31161, Y47, SE Michigan > > > -- > For archives and unsub > http://mail.lancaironline.net:81/lists/lml/List.html > > --001636426a0b05fa9d049d7202a0 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thanks, Lorn,

I have the small-tail 360. I'm guessing that 197kt= as is probably one of the slower examples.=A0 I think Rick Argente's 36= 0 is good for about 205ktas if memory serves.

I was parked on the ra= mp at Statesboro, GA when a Lo Presti employee walked over after climbing o= ut of his Mooney. "Ohhhh the things I could do to this plane," he= said :)=A0 He was practically drooling and reaching for glass fab tools ri= ght there and then.=A0 I finished up and said, "I'm dead serious, = you need to get this plane to our facility, we would much rather work on th= is than put 'speed mods' on a Cherokee!"

One very tangible item that he mentioned right out of the gate was an e= xtension for the ram air intake to bring it within a inch of the back of th= e prop. He says that the pressure recovery you get from the ram air system = is that much better as you move the intake closer to the prop.=A0 He then e= xamined the underside of the wing and recommended some tape for the flaps, = saying there wasn't much that could done on the ailerons.

Interesting experience. I'm happy with how it flies, but if time an= d money ever permit, I will look at a plenum or better baffling, as I read = Chris' articles on cooling drag prior to buying the 360, and then perha= ps taking it to Lo Presti to see what they would do with it.

Keith

On Tue, Mar 1, 2011 at 3:19 PM,= Lorn H Olsen <lor= n@dynacomm.us> wrote:
Keith,

I normally fly at 160 kts ias at 7,500 ft. This would be about 184 kts tas = ((1+.075*2)*160). This is at 2,350 rpm, 23.5" mp & 7.5 gph.

When I go up to 2,550 rpm, full throttle & 8.5 gph, my speed goes up to= 170 kts ias or about 195 kts tas. I have a standard 160 hp O-320 w/Aero Co= mposites carbon prop.

My data corresponds to the following CAFE report:




The 360 is supposed to be 10 kts faster than the 320. Your data confirms th= at.

I believe that my prop increases my speed by about 5 kts tas.

Lorn

Here is the Lancair 320 Per

> From: Keith Smith <keith.s= mith@gmail.com>
> Date: February 28, 2011 7:19:31 PM EST
>
> I posted those Lancair 360 speeds. I'm well aware that GS is not r= epresentative of aircraft performance, but it's also a guilty pleasure = to track 'em :)
>
> One figure I'm truly interested in is what the maximum sustained t= rue airspeed is in level flight for various Lancair 360s. I know my plane i= s good for 197ktas with me in it...no more and no less. I actually use that= information as a gauge for how the plane is doing on any given day. One da= y I was getting 202, sustained for a few minutes in level flight. That got = my attention. It turned out to be a very slight updraft. I paid the piper l= ater on, though, entering a similar downdraft, taking me down to around 185= ktas.
>
> Groundspeeds are fun to giggle over. True airspeed in level flight is = something to admire. I'm guessing the cleanest 360's with 180hp pow= er plants are good for around 205ktas, perhaps?
>
> Keith

--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:l= orn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,790 hrs, N31161, Y47, SE Michigan


--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/L= ist.html


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