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Wayne Lenox
Joined: 07 Jan 2008
Posts: 75
Location: Arizona in the winter
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 Posted: Tue Mar 03, 2009 7:26 am Post subject: Havasu..Maybe this one's for you, Gary! |
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Buz
Yes 62FK58. Did you loose much climb performance with the extra pitch? My cruse speed is in the high 140's or Low 150's MPH TAS. 2850RPM and 5.5 GPH.
Wayne
-- N1BZRich(at)aol.com wrote:
In a message dated 3/2/2009 10:23:07 P.M. Eastern Standard Time, N1BZRich(at)aol.com writes:
| Quote: | | more than likely you have a 63FK58 prop. |
Typo - meant to type 62FK58. A 62 diameter, not 63.
Buz
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N1BZRich(at)AOL.COM
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| Posted: Tue Mar 03, 2009 9:26 am Post subject: Havasu..Maybe this one's for you, Gary! |
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In a message dated 3/3/2009 10:27:29 A.M. Eastern Standard Time, waynelenox(at)juno.com writes:
| Quote: |
Yes 62FK58. Did you loose much climb performance with the extra pitch? My cruse speed is in the high 140's or Low 150's MPH TAS. 2850RPM and 5.5 GPH. |
Hi Wayne,
Assuming your numbers are at 5000' density altitude, here are 5000' DA numbers at 2850 rpm with the two props:
2850 rpm
64ZK55 = 150 MPH, true airspeed burning 4.8 gph
62FK60 = 158 MPH, true airspeed burning 5.6 gph
Take off roll is not much longer with the 60 inch pitch. In fact, I have never had a takeoff roll longer than about 700 to 800' even on a 100 degree day at gross weight. Takeoff roll rpm is about the same with both props.
Climb rate is only slightly lower with the 60 inch pitch when I hole either 100 mph or 115 mph. Both speeds give me about 1200 feet per minute at gross weight. However, climb rpm with the 60 inch pitch prop is about 2600 vice the 2700 I get with the ZK prop. The 2700 rpm is better because it is closer to the power curve of the engine, but as I mentioned the 60 prop gives about the same climb even when at the slightly slower rpm in the climb.
One other thought - since I normally set 6 gph cruise speed when on a long cross country here is what that does with both props - numbers still at 5000 even though I normally am higher when XC.
6 GPH
64ZK55 = 157, and that is at 2980 rpm
62FK60 = 162, and that is at 2880 rpm
NOTE: These speeds go up 2 to 3 mph as fuel is burned down at he end of a four hour flight.
Buz
Need a job? Find employment help in your area.
[quote][b]
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IFLYSMODEL(at)aol.com
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| Posted: Tue Mar 03, 2009 11:04 am Post subject: Havasu..Maybe this one's for you, Gary! |
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Hey Buz: What should we see as take off RPM?
Lynn
A Good Credit Score is 700 or Above. See yours in just 2 easy steps!
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info(at)flylightning.net
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| Posted: Tue Mar 03, 2009 11:20 am Post subject: Havasu..Maybe this one's for you, Gary! |
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2650-2750 on a lightning.
nick
From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of IFLYSMODEL(at)aol.com
Sent: Tuesday, March 03, 2009 1:03 PM
To: lightning-list(at)matronics.com
Subject: Re: Lightning-List: Havasu..Maybe this one's for you, Gary!
Hey Buz: What should we see as take off RPM?
Lynn
A Good Credit Score is 700 or Above. See yours in just 2 easy steps!
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href="http://www.matronics.com/Navigator?Lightning-List">http://www.matronics.com/Navigator?Lightning-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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Wayne Lenox
Joined: 07 Jan 2008
Posts: 75
Location: Arizona in the winter
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| Posted: Tue Mar 03, 2009 1:41 pm Post subject: Havasu..Maybe this one's for you, Gary! |
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Thanks Buz
The 60 inch pitch prop sure makes a difference. However I set a little less FF. 5.5 GPH.
Wayne
-- N1BZRich(at)aol.com wrote:
In a message dated 3/3/2009 10:27:29 A.M. Eastern Standard Time, waynelenox(at)juno.com writes:
| Quote: |
Yes 62FK58. Did you loose much climb performance with the extra pitch? My cruse speed is in the high 140's or Low 150's MPH TAS. 2850RPM and 5.5 GPH. |
Hi Wayne,
Assuming your numbers are at 5000' density altitude, here are 5000' DA numbers at 2850 rpm with the two props:
2850 rpm
64ZK55 = 150 MPH, true airspeed burning 4.8 gph
62FK60 = 158 MPH, true airspeed burning 5.6 gph
Take off roll is not much longer with the 60 inch pitch. In fact, I have never had a takeoff roll longer than about 700 to 800' even on a 100 degree day at gross weight. Takeoff roll rpm is about the same with both props.
Climb rate is only slightly lower with the 60 inch pitch when I hole either 100 mph or 115 mph. Both speeds give me about 1200 feet per minute at gross weight. However, climb rpm with the 60 inch pitch prop is about 2600 vice the 2700 I get with the ZK prop. The 2700 rpm is better because it is closer to the power curve of the engine, but as I mentioned the 60 prop gives about the same climb even when at the slightly slower rpm in the climb.
One other thought - since I normally set 6 gph cruise speed when on a long cross country here is what that does with both props - numbers still at 5000 even though I normally am higher when XC.
6 GPH
64ZK55 = 157, and that is at 2980 rpm
62FK60 = 162, and that is at 2880 rpm
NOTE: These speeds go up 2 to 3 mph as fuel is burned down at he end of a four hour flight.
Buz
Need a job? Find employment help in your area.
| Quote: |
====================================
ist">http://www.matronics.com/Navigator?Lightning-List
====================================
tronics.com
====================================
www.matronics.com/contribution
====================================
|
____________________________________________________________
[url=_blank]Rock Solid Web Hosting. Click Here.[/url]
[quote][b]
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dashvii(at)hotmail.com
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| Posted: Tue Mar 03, 2009 3:45 pm Post subject: Havasu..Maybe this one's for you, Gary! |
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I believe that in Greg's plane we got high 140's C 2950 RPM at 10k and burning 6.5Gph. There were some fuel issues though. We had a stuck sump which was pouring for half the flight and there were some jetting issues. Brian W.
From: N1BZRich(at)aol.com
Date: Tue C 3 Mar 2009 12:25:45 -0500
Subject: Re: Havasu..Maybe this one's for you C Gary!
To: lightning-list(at)matronics.com
In a message dated 3/3/2009 10:27:29 A.M. Eastern Standard Time C waynelenox(at)juno.com writes:
| Quote: | Yes 62FK58. Did you loose much climb performance with the extra pitch? My cruse speed is in the high 140's or Low 150's MPH TAS. 2850RPM and 5.5 GPH.
|
Hi Wayne C
Assuming your numbers are at 5000' density altitude C here are 5000' DA numbers at 2850 rpm with the two props:
2850 rpm
64ZK55 = 150 MPH C true airspeed burning 4.8 gph
62FK60 = 158 MPH C true airspeed burning 5.6 gph
Take off roll is not much longer with the 60 inch pitch. In fact C I have never had a takeoff roll longer than about 700 to 800' even on a 100 degree day at gross weight. Takeoff roll rpm is about the same with both props.
Climb rate is only slightly lower with the 60 inch pitch when I hole either 100 mph or 115 mph. Both speeds give me about 1200 feet per minute at gross weight. However C climb rpm with the 60 inch pitch prop is about 2600 vice the 2700 I get with the ZK prop. The 2700 rpm is better because it is closer to the power curve of the engine C but as I mentioned the 60 prop gives about the same climb even when at the slightly slower rpm in the climb.
One other thought - since I normally set 6 gph cruise speed when on a long cross country here is what that does with both props - numbers still at 5000 even though I normally am higher when XC.
6 GPH
64ZK55 = 157 C and that is at 2980 rpm
62FK60 = 162 C and that is at 2880 rpm
NOTE: These speeds go up 2 to 3 mph as fuel is burned down at he end of a four hour flight.
Buz
Need a job? Find employment help in your area.
| Quote: |
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