X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-2.exch003intermedia.net ([207.5.74.29] verified) by logan.com (CommuniGate Pro SMTP 5.3.2) with ESMTPS id 4119867 for flyrotary@lancaironline.net; Wed, 10 Feb 2010 15:25:50 -0500 Received-SPF: none receiver=logan.com; client-ip=207.5.74.29; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-2.exch003intermedia.net ([207.5.74.29]) with mapi; Wed, 10 Feb 2010 12:25:13 -0800 From: Jeff Whaley To: Rotary motors in aircraft Date: Wed, 10 Feb 2010 12:27:32 -0800 Subject: RE: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. Renesis to turbo Thread-Topic: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. Renesis to turbo Thread-Index: AcqqVe/LmJkGp2b3RuOxQpjCiaVwtAAIpEnw Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E017931DE8C45EXVMBX0035e_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0E017931DE8C45EXVMBX0035e_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hey Tracy, you're doing better than theoretical ... 6300 engine rpm / 2.17 =3D 2903.225 prop rpm 2903.225 prop rpm x 60 =3D 174193.548 prop rph (revs per hour) 174193.548 rph x 71 inch pitch =3D 12367741.935 inches of forward travel pe= r hour 12367741.935" / 12 =3D 1030645.131 feet per hour 1030645.161 fph / 5280 =3D 195.2 mph Your 209 mph appears to be better than best theoretical ... 209 / 195.2 =3D 1.07; 1.07 x 2903.225 =3D 3108 prop rpm / or 1.07 x 71 =3D 75.97 inch pitch ... = the following table from Warp Drive gives same numbers. 210 mph at 2900 rpm requires 76" pitch; or conversely 210 mph at 71" pitch = requires 3100 rpm. Jeff Prop RPM Cruise Air Speed 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 3800 3900 4000 4100 4200 220 89 86 83 80 77 75 73 70 68 66 65 63 61 60 58 56 55 210 85 82 79 76 74 71 69 67 65 63 62 60 58 57 55 54 53 200 81 78 75 72 70 68 66 65 62 61 59 57 56 54 53 51 50 190 77 74 72 69 67 65 63 61 59 57 56 54 53 51 50 49 48 180 73 70 68 66 63 61 59 58 56 54 53 52 50 49 48 46 45 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of Tracy Crook Sent: Wednesday, February 10, 2010 8:35 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. Re= nesis to turbo Sun 100 flown at 500 ft. Top speed on a normally aspirated aircraft is always best at sealevel. Be= st fuel economy is reached up high. Tracy On Tue, Feb 9, 2010 at 10:45 PM, Mike Wills > wrote: When you guys put out these numbers (RPM, speed, etc...) would also be help= ful to know at what altitude. I assume at or close to sea level? I havent y= et made any speed runs at low altitude. Mike From: Tracy Crook Sent: Tuesday, February 09, 2010 5:27 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. Re= nesis to turbo Tracy, if you have the data could you give us the RPMs you saw at the 205 = and 217.5 air speeds? Dennis H. Renesis RV-7A Austin, Tx. That was 209 and 217.5 the 209 mph speed was with the 2.176 drive turning a 68 - 71 prop with engi= ne turning 6300 , mixture leaned to 17 gph. On other occasions I could pus= h it to 6400 at best power mixture burning 20 gph. The 217.5 mph was with a 2.85 drive turning a 74 - 88 prop with engine turn= ing 7250. I didn't get a good read on the fuel flow but obviously it would= have been higher. I remember requesting priority landing after the race d= ue to low fuel. Neither run was done at best power mixture but leaned a few gph less than m= ax. Tracy This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized disclosure is strictly prohibited. If you have received this message= in error, please notify us immediately so that we may correct our internal= records. Please then delete the original message. Thank you. --_000_C03ABB0A7362B84BB53D544B3C305E0E017931DE8C45EXVMBX0035e_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hey Tracy, you’re doing better than theoretical …= ;

6300 engine rpm / 2.17 =3D 2903.225 prop rpm

2903.225 prop rpm x 60 =3D 174193.548 prop rph (revs per hou= r)

174193.548 rph x 71 inch pitch =3D 12367741.935 inches of fo= rward travel per hour

12367741.935” / 12 =3D 1030645.131 feet per hour<= /o:p>

1030645.161 fph / 5280 =3D 195.2 mph

Your 209 mph appears to be better than best theoretical &nbs= p;…

209 / 195.2 =3D 1.07;

1.07 x 2903.225 =3D 3108 prop rpm  / or 1.07 x 71 =3D 7= 5.97 inch pitch … the following table from Warp Drive gives same numb= ers.

210 mph at 2900 rpm requires 76” pitch; or conversely = 210 mph at 71” pitch requires 3100 rpm.

Jeff

 

 

Prop RPM

Crui= se Air Speed

2600=

2700=

2800=

2900=

3000=

3100=

3200=

3300=

3400=

3500=

3600=

3700=

3800=

3900=

4000=

4100=

4200=

220<= /b>

89=

86=

83=

80=

77=

75=

73=

70=

68=

66=

65=

63=

61=

60=

58=

56=

55=

210<= /b>

85=

82=

79=

76

74=

71

69=

67=

65=

63=

62=

60=

58=

57=

55=

54=

53=

200<= /b>

81=

78=

75=

72=

70=

68=

66=

65=

62=

61=

59=

57=

56=

54=

53=

51=

50=

190<= /b>

77=

74=

72=

69=

67=

65=

63=

61=

59=

57=

56=

54=

53=

51=

50=

49=

48=

180<= /b>

73=

70=

68=

66=

63=

61=

59=

58=

56=

54=

53=

52=

50=

49=

48=

46=

45=

 

 

From: Rotary m= otors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Wednesday, February 10, 2010 8:35 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: = N.A. Renesis to turbo

 

Sun 100 flown at 500 = ft.
Top speed on a normally aspirated aircraft is always best at sealevel. = ;  Best fuel economy is reached up high.

Tracy

On Tue, Feb 9, 2010 at 10:45 PM, Mike Wills <rv-4mike@cox.net> wrote:<= /p>

When you guys put out these numbers (RPM, speed, etc...)= would also be helpful to know at what altitude. I assume at or close to se= a level? I havent yet made any speed runs at low altitude.

 

Mike

 

From:<= /b> Tracy Crook

Sent:<= /b> Tuesday, February 09, 2010 5:27 PM

Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. Renesis to turbo

 

Tracy, if you have the d= ata could you give us the  RPMs you saw at the 205 and 217.5 air speed= s?

Dennis H.
Renesis RV-7A
Austin, Tx.

That was 209 and 217.5   

the 209 mph speed was with the 2.176 drive turning a 68 - 71 prop with engi= ne turning 6300 , mixture leaned to 17 gph.  On other occasions I coul= d push it to 6400 at best power mixture burning 20 gph.

The 217.5 mph was with a 2.85 drive turning a 74 - 88 prop with engine turn= ing 7250.  I didn't get a good read on the fuel flow but obviously it = would have been higher.  I remember requesting priority landing after = the race due to low fuel.  

Neither run was done at best power mixture but leaned a few gph less than m= ax.

Tracy

 


This message, and the docum= ents attached hereto, is intended only for the addressee and may contain pr= ivileged or confidential information. Any unauthorized disclosure is strict= ly prohibited. If you have received this message in error, please notify us immediately so that we may correct our = internal records. Please then delete the original message. Thank you.
 --_000_C03ABB0A7362B84BB53D544B3C305E0E017931DE8C45EXVMBX0035e_--