N1BZRich(at)aol.com
Guest
|
 Posted: Wed Mar 25, 2009 4:52 am Post subject: Flight to Tennessee w/ some manifold pressures |
 |
|
All,
Good flight to SYI yesterday morning. Almost no clouds in the sky until approaching Shelbyville then widely scattered. Winds and "bumpy" air were another story. I actually had a tail wind for about the first 1/3 of the trip (it varied between 6 to 10 knots on the tail), but then went away as I got into the foothills of Virginia. By the time I got to the mountains and had to climb from 4,500 to 6,500 and then to 8,500 the wind became a head wind and the "bumps" started, eventually you could feel them all the way up to 8,500. Head wind from about 50 miles east of Bristol all the way to SYI varied between 10 to 18 on the nose.
In order to get some manifold pressure data for Selwyn and Bob, I wrote those numbers down for the altitudes and fuel management technique I was using. Here are the results:
At 2,000 MSL I set fuel flow at 6.0 GPH which resulted in 2850 RPM, 161 TAS in MPH, and a MP of 22.4
At 3,000 MSL, with fuel flow set at 6.0 GPH, RPM was 2860, TAS in MPH was 161, and MP was 22.2
At 4,000 MSL, with fuel flow set at 6.0 GPH, RPM was 2870, TAS in MPH was 162, and MP was 21.8
At 4,500 MSL, with fuel flow set at 6.0 GPH, RPM was 2880, TAS in MPH was 161, and MP was 21.4
At 6,500 MSL, with fuel flow set at 6.0 GPH, RPM was 2890, TAS in MPH was 162, and MP was 20.2
At 8,500 MSL, with fuel flow set at 6.0 GPH, RPM was 2920, TAS in MPH was 162, and MP was 19.2
NOTE: TAS while at 8,500 was initially 162, but climbed to 165 as fuel was burned off.
Based on distance flown and total elapsed time from pulling onto the runway to turning off the runway at SYI, the speed across the ground was 157.67 mph (of course this includes all climbs and descent). And remember, I had some tail wind and some head wind. Also, my climb technique is to use a cruise climb of about 120 mph. Total time spend in climbs today was not too bad because the longest sustained climb was only 2000'. My descent technique is to start down far enough out so that I can get a 500'/min rate with at least the same speed. I keep pulling the power pulled back and even slow down if the bumps that I am flying in get too uncomfortable. I think the average speed of about 158 from on the runway to off the runway is pretty good. Fuel flow for the flight, based on how many gallons I added at SYI, worked out to be 5.8 GPH which is pretty much what I expected. I have my fuel flow system set slightly conservative, so when I am showing 6 GPH, I am really burning slightly less. I like it that way. On shutdown, I still had about an hour and twenty minutes of flying time left if I kept the power the same. Much longer if I wanted to reduce power.
Some of the new LS-1 parts are back from the paint shop and it is looking good. Also, Pat and Carl are here and their jet really looks good based on the colors they chose. I will be finishing up the newsletter while here and will try to get some photos of both of these new Lightnings. I flew one test flight in the demo yesterday afternoon to gather ASTM data for the SLSA paperwork. Nick had done an incredible job of putting together the overall test plan to show compliance for the ASTM certification. He has every small detail written out as to the data required and the compliance methods. I just hope the weather cooperates. Right now SYI is IFR with low clouds and mist. Bummer.
Blue Skies,
Buz
Feeling the pinch at the grocery store? Make dinner for $10 or less.
[quote][b]
| | - The Matronics Lightning-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Lightning-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
