Subject: LNC2/320 Cruise Speed Date: Fri, 25 Ju= n 2010 13:59:58 =20 -0400 To: lml@lancaironline.net 06/22/10 I was flying from Detroit to Ft= =20 Lauderdale at 11,000. With nothing else to do, I thought that I would tak= e=20 a few measurements. Condition LOP Lo ROP Hi --------- -------- --------- 11,000 IA 2,350RPM 2,700 RPM 13,000 DA 19.3"MP 19.8"MP 30.08 "Hg 6.0 GPH 8.6 GPH 12=B0C temp 139 kts IAS 152 kts IAS 35=B0F dewpt? 168 kts TAS 183 kts TAS 1,670 lbs For a 43% increase in fuel, a 9% increase in airspeed doesn't sound like= =20 much. However, 183 kts airspeed at 13,000 ft density altitude, no matter= how=20 you do it, is great. The LOP reading at .435 BSFC comes out to HP =3D 36 * 6 * .435 =3D 94.0= HP or=20 94.0 / 160 =3D 59% power. Comments appreciated. Lorn --part1_371ea.7a8b3908.395691f4_boundary Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable <= FONT id=3Drole_document color=3D#000000 size=3D2 face=3DArial>

Wolfgang,

Interesting.

In real life and with my power set at a guess of zero thrust, the AOA= shows=20 a best glide of about 106 KIAS. That is 1.767 NM/minute or 10734=20 feet/minute.

With my prop in cruise pitch the descent rate was about 1500 feet/min= or a=20 glide ratio of 7:1 - drat.

With my prop in coarse pitch, the descent rate drops to about 500 ft/= min or=20 a glide ratio of 21:1 - ooh.....

You are right in that drag is everything. Even small flat plate= drag=20 requires power cubed for overcoming parasitic drag squared. Best gli= de=20 speed is at max lift/drag where the induced drag and parasitic drag curves= =20 intersect. Induced drag increasing as speed is reduced and parasitic= drag=20 increasing as speed increases.

Scott Krueger

IO 320

In a message dated 6/25/2010 5:30:14 P.M. Central Daylight Time,=20 Wolfgang@MiCom.net writes:

Clean up the airframe so it can get a glide ratio of 15:1 at 300mph= and=20 you can keep the same motor and fuel consumption.

The numbers below come out to a glide ratio of just better=20 than 10:1

Wolfgang

From: Lorn H Olsen=20 <lorn@dynacomm.us>

Sender: <marv@lancaironline.net>=

Subject: LNC2/320 Cruise Speed
Date: Fri, 25 Jun 2010 13:59:58=20 -0400

To: lml@lancaironl= ine.net

06/22/10 I was flying from Detroit to Ft= =20 Lauderdale at 11,000. With nothing else to do, I thought that I wo= uld=20 take a few measurements. Condition LOP Lo ROP Hi -------= --=20 -------- --------- 11,000 IA 2,350RPM 2,700 RPM 13,000 DA 19= .3"MP=20 19.8"MP 30.08 "Hg 6.0 GPH 8.6 GPH 12=B0C temp 139 kts IAS 15= 2 kts=20 IAS 35=B0F dewpt? 168 kts TAS 183 kts TAS 1,670 lbs F= or a 43%=20 increase in fuel, a 9% increase in airspeed doesn't sound like muc= h.=20 However, 183 kts airspeed at 13,000 ft density altitude, no matter= how=20 you do it, is great. The LOP reading at .435 BSFC comes out= to HP=20 =3D 36 * 6 * .435 =3D 94.0 HP or 94.0 / 160 =3D 59% power. = Comments=20 appreciated. Lorn

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