Excellent description of how the efficiency of an engine is affected by
the various factors Rick. I think I will plagiarize it sometime in
the future :-)> Can I post this to the ACRE NL web site?
Rick Price
Why, thank you Paul. So far as I'm concerned, what I wrote is public domain, so do whatever you'd like to with it.
Thanks rick I will give you credit. I am trying to structure the web site
so people can get a basic education on engines.
BTW Bill and I are still working on the BSFC calculations from flight performance data.
This is the latest output from my program. Still not the final word
however. Eventually I will up load it so it can be run in Windows in a
DOS window while asking for certain performance numbers.
Note that a small reduction in cruise speed has a far larger effect
on MPG than a point or two in the BSFC numbers.
Paul Lamar
The AirCraft Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/ http://www.linux.org
Flat Plat = 2.08 BSFC = 0.40
HP FPS MPH thrust drag pounds gal MPG
65.0 224.9 153.3 127.2 127.1 26.0 4.3 36.0
70.0 230.6 157.2 133.6 133.7 28.0 4.6 34.2
75.0 235.9 160.9 139.9 139.9 30.0 4.9 32.7
80.0 241.1 164.4 146.0 146.2 32.0 5.2 31.3
85.0 245.9 167.7 152.1 152.0 34.0 5.6 30.1
90.0 250.7 170.9 158.0 158.0 36.0 5.9 29.0
95.0 255.2 174.0 163.8 163.8 38.0 6.2 27.9
100.0 259.6 177.0 169.5 169.5 40.0 6.6 27.0
105.0 263.9 179.9 175.1 175.1 42.0 6.9 26.1
110.0 268.0 182.7 180.6 180.6 44.0 7.2 25.3
115.0 272.1 185.5 186.0 186.1 46.0 7.5 24.6
120.0 275.9 188.1 191.4 191.4 48.0 7.9 23.9
125.0 279.6 190.7 196.7 196.6 50.0 8.2 23.3
130.0 283.3 193.2 201.9 201.8 52.0 8.5 22.7
135.0 287.0 195.7 207.0 207.1 54.0 8.9 22.1
140.0 290.5 198.0 212.1 212.1 56.0 9.2 21.6
145.0 293.9 200.4 217.1 217.2 58.0 9.5 21.1
150.0 297.2 202.6 222.1 222.0 60.0 9.8 20.6
155.0 300.5 204.9 227.0 227.0 62.0 10.2 20.2
160.0 303.7 207.1 231.8 231.9 64.0 10.5 19.7
Flat Plat = 2.08 BSFC = 0.42
HP FPS MPH thrust drag pounds gal MPG
65.0 224.9 153.3 127.2 127.1 27.3 4.5 34.3
70.0 230.6 157.2 133.6 133.7 29.4 4.8 32.6
75.0 235.9 160.9 139.9 139.9 31.5 5.2 31.1
80.0 241.1 164.4 146.0 146.2 33.6 5.5 29.8
85.0 245.9 167.7 152.1 152.0 35.7 5.9 28.7
90.0 250.7 170.9 158.0 158.0 37.8 6.2 27.6
95.0 255.2 174.0 163.8 163.8 39.9 6.5 26.6
100.0 259.6 177.0 169.5 169.5 42.0 6.9 25.7
105.0 263.9 179.9 175.1 175.1 44.1 7.2 24.9
110.0 268.0 182.7 180.6 180.6 46.2 7.6 24.1
115.0 272.1 185.5 186.0 186.1 48.3 7.9 23.4
120.0 275.9 188.1 191.4 191.4 50.4 8.3 22.8
125.0 279.6 190.7 196.7 196.6 52.5 8.6 22.2
130.0 283.3 193.2 201.9 201.8 54.6 9.0 21.6
135.0 287.0 195.7 207.0 207.1 56.7 9.3 21.1
140.0 290.5 198.0 212.1 212.1 58.8 9.6 20.5
145.0 293.9 200.4 217.1 217.2 60.9 10.0 20.1
150.0 297.2 202.6 222.1 222.0 63.0 10.3 19.6
155.0 300.5 204.9 227.0 227.0 65.1 10.7 19.2
160.0 303.7 207.1 231.8 231.9 67.2 11.0 18.8
Flat Plat = 2.08 BSFC = 0.44
HP FPS MPH thrust drag pounds gal MPG
65.0 224.9 153.3 127.2 127.1 28.6 4.7 32.7
70.0 230.6 157.2 133.6 133.7 30.8 5.0 31.1
75.0 235.9 160.9 139.9 139.9 33.0 5.4 29.7
80.0 241.1 164.4 146.0 146.2 35.2 5.8 28.5
85.0 245.9 167.7 152.1 152.0 37.4 6.1 27.3
90.0 250.7 170.9 158.0 158.0 39.6 6.5 26.3
95.0 255.2 174.0 163.8 163.8 41.8 6.9 25.4
100.0 259.6 177.0 169.5 169.5 44.0 7.2 24.5
105.0 263.9 179.9 175.1 175.1 46.2 7.6 23.8
110.0 268.0 182.7 180.6 180.6 48.4 7.9 23.0
115.0 272.1 185.5 186.0 186.1 50.6 8.3 22.4
120.0 275.9 188.1 191.4 191.4 52.8 8.7 21.7
125.0 279.6 190.7 196.7 196.6 55.0 9.0 21.1
130.0 283.3 193.2 201.9 201.8 57.2 9.4 20.6
135.0 287.0 195.7 207.0 207.1 59.4 9.7 20.1
140.0 290.5 198.0 212.1 212.1 61.6 10.1 19.6
145.0 293.9 200.4 217.1 217.2 63.8 10.5 19.2
150.0 297.2 202.6 222.1 222.0 66.0 10.8 18.7
155.0 300.5 204.9 227.0 227.0 68.2 11.2 18.3
160.0 303.7 207.1 231.8 231.9 70.4 11.5 17.9
Flat Plat = 2.08 BSFC = 0.46
HP FPS MPH thrust drag pounds gal MPG
65.0 224.9 153.3 127.2 127.1 29.9 4.9 31.3
70.0 230.6 157.2 133.6 133.7 32.2 5.3 29.8
75.0 235.9 160.9 139.9 139.9 34.5 5.7 28.4
80.0 241.1 164.4 146.0 146.2 36.8 6.0 27.3
85.0 245.9 167.7 152.1 152.0 39.1 6.4 26.2
90.0 250.7 170.9 158.0 158.0 41.4 6.8 25.2
95.0 255.2 174.0 163.8 163.8 43.7 7.2 24.3
100.0 259.6 177.0 169.5 169.5 46.0 7.5 23.5
105.0 263.9 179.9 175.1 175.1 48.3 7.9 22.7
110.0 268.0 182.7 180.6 180.6 50.6 8.3 22.0
115.0 272.1 185.5 186.0 186.1 52.9 8.7 21.4
120.0 275.9 188.1 191.4 191.4 55.2 9.0 20.8
125.0 279.6 190.7 196.7 196.6 57.5 9.4 20.2
130.0 283.3 193.2 201.9 201.8 59.8 9.8 19.7
135.0 287.0 195.7 207.0 207.1 62.1 10.2 19.2
140.0 290.5 198.0 212.1 212.1 64.4 10.6 18.8
145.0 293.9 200.4 217.1 217.2 66.7 10.9 18.3
150.0 297.2 202.6 222.1 222.0 69.0 11.3 17.9
155.0 300.5 204.9 227.0 227.0 71.3 11.7 17.5
160.0 303.7 207.1 231.8 231.9 73.6 12.1 17.2
Flat Plat = 2.08 BSFC = 0.48
HP FPS MPH thrust drag pounds gal MPG
65.0 224.9 153.3 127.2 127.1 31.2 5.1 30.0
70.0 230.6 157.2 133.6 133.7 33.6 5.5 28.5
75.0 235.9 160.9 139.9 139.9 36.0 5.9 27.3
80.0 241.1 164.4 146.0 146.2 38.4 6.3 26.1
85.0 245.9 167.7 152.1 152.0 40.8 6.7 25.1
90.0 250.7 170.9 158.0 158.0 43.2 7.1 24.1
95.0 255.2 174.0 163.8 163.8 45.6 7.5 23.3
100.0 259.6 177.0 169.5 169.5 48.0 7.9 22.5
105.0 263.9 179.9 175.1 175.1 50.4 8.3 21.8
110.0 268.0 182.7 180.6 180.6 52.8 8.7 21.1
115.0 272.1 185.5 186.0 186.1 55.2 9.0 20.5
120.0 275.9 188.1 191.4 191.4 57.6 9.4 19.9
125.0 279.6 190.7 196.7 196.6 60.0 9.8 19.4
130.0 283.3 193.2 201.9 201.8 62.4 10.2 18.9
135.0 287.0 195.7 207.0 207.1 64.8 10.6 18.4
140.0 290.5 198.0 212.1 212.1 67.2 11.0 18.0
145.0 293.9 200.4 217.1 217.2 69.6 11.4 17.6
150.0 297.2 202.6 222.1 222.0 72.0 11.8 17.2
155.0 300.5 204.9 227.0 227.0 74.4 12.2 16.8
160.0 303.7 207.1 231.8 231.9 76.8 12.6 16.4
Flat Plat = 2.08 BSFC = 0.50
HP FPS MPH thrust drag pounds gal MPG
65.0 224.9 153.3 127.2 127.1 32.5 5.3 28.8
70.0 230.6 157.2 133.6 133.7 35.0 5.7 27.4
75.0 235.9 160.9 139.9 139.9 37.5 6.1 26.2
80.0 241.1 164.4 146.0 146.2 40.0 6.6 25.1
85.0 245.9 167.7 152.1 152.0 42.5 7.0 24.1
90.0 250.7 170.9 158.0 158.0 45.0 7.4 23.2
95.0 255.2 174.0 163.8 163.8 47.5 7.8 22.3
100.0 259.6 177.0 169.5 169.5 50.0 8.2 21.6
105.0 263.9 179.9 175.1 175.1 52.5 8.6 20.9
110.0 268.0 182.7 180.6 180.6 55.0 9.0 20.3
115.0 272.1 185.5 186.0 186.1 57.5 9.4 19.7
120.0 275.9 188.1 191.4 191.4 60.0 9.8 19.1
125.0 279.6 190.7 196.7 196.6 62.5 10.2 18.6
130.0 283.3 193.2 201.9 201.8 65.0 10.7 18.1
135.0 287.0 195.7 207.0 207.1 67.5 11.1 17.7
140.0 290.5 198.0 212.1 212.1 70.0 11.5 17.3
145.0 293.9 200.4 217.1 217.2 72.5 11.9 16.9
150.0 297.2 202.6 222.1 222.0 75.0 12.3 16.5
155.0 300.5 204.9 227.0 227.0 77.5 12.7 16.1
160.0 303.7 207.1 231.8 231.9 80.0 13.1 15.8
Flat Plat = 2.08 BSFC = 0.52
HP FPS MPH thrust drag pounds gal MPG
65.0 224.9 153.3 127.2 127.1 33.8 5.5 27.7
70.0 230.6 157.2 133.6 133.7 36.4 6.0 26.3
75.0 235.9 160.9 139.9 139.9 39.0 6.4 25.2
80.0 241.1 164.4 146.0 146.2 41.6 6.8 24.1
85.0 245.9 167.7 152.1 152.0 44.2 7.2 23.1
90.0 250.7 170.9 158.0 158.0 46.8 7.7 22.3
95.0 255.2 174.0 163.8 163.8 49.4 8.1 21.5
100.0 259.6 177.0 169.5 169.5 52.0 8.5 20.8
105.0 263.9 179.9 175.1 175.1 54.6 9.0 20.1
110.0 268.0 182.7 180.6 180.6 57.2 9.4 19.5
115.0 272.1 185.5 186.0 186.1 59.8 9.8 18.9
120.0 275.9 188.1 191.4 191.4 62.4 10.2 18.4
125.0 279.6 190.7 196.7 196.6 65.0 10.7 17.9
130.0 283.3 193.2 201.9 201.8 67.6 11.1 17.4
135.0 287.0 195.7 207.0 207.1 70.2 11.5 17.0
140.0 290.5 198.0 212.1 212.1 72.8 11.9 16.6
145.0 293.9 200.4 217.1 217.2 75.4 12.4 16.2
150.0 297.2 202.6 222.1 222.0 78.0 12.8 15.8
155.0 300.5 204.9 227.0 227.0 80.6 13.2 15.5
160.0 303.7 207.1 231.8 231.9 83.2 13.6 15.2