True...
Here is a table....pretty close using 305fps
Arrow speed (downrange): 92.95 m/s -- 304.96 fps
Time to reach 20 meters: 0.21 sec
Time to reach 40 meters: 0.42 sec
I calculated the following sight marks (relative to 20.0 m sightmark):
for 18 meters, move sight pin 0.10 cm up (time in flight = 0.19 sec)
for 30 meters, move sight pin 0.50 cm down (time in flight = 0.32 sec)
for 50 meters, move sight pin 1.50 cm down (time in flight = 0.53 sec)
for 70 meters, move sight pin 2.50 cm down (time in flight = 0.75 sec)
for 90 meters, move sight pin 3.51 cm down (time in flight = 0.96 sec)
Detailed sight mark table, relative to 20.0 m sightmark:
Distance Sight pin offset Launch angle Time in flight
10m 0.50 cm up 0.28 degrees 0.10 sec
15m 0.25 cm up 0.44 degrees 0.15 sec
20m 0.00 cm down 0.61 degrees 0.21 sec
25m 0.25 cm down 0.77 degrees 0.26 sec
30m 0.50 cm down 0.93 degrees 0.32 sec
35m 0.75 cm down 1.09 degrees 0.37 sec
40m 1.00 cm down 1.26 degrees 0.42 sec
45m 1.25 cm down 1.42 degrees 0.48 sec
50m 1.50 cm down 1.58 degrees 0.53 sec
55m 1.75 cm down 1.74 degrees 0.58 sec
60m 2.00 cm down 1.91 degrees 0.64 sec
65m 2.25 cm down 2.07 degrees 0.69 sec
70m 2.50 cm down 2.23 degrees 0.75 sec
75m 2.75 cm down 2.40 degrees 0.80 sec
80m 3.01 cm down 2.56 degrees 0.85 sec
85m 3.26 cm down 2.72 degrees 0.91 sec
90m 3.51 cm down 2.89 degrees 0.96 sec
95m 3.76 cm down 3.05 degrees 1.02 sec
100m 4.01 cm down 3.21 degrees 1.07 sec
Detailed yard sight mark table, relative to 20.0 m sightmark:
Distance Sight pin offset Launch angle Time in flight
10yd 0.21 inches up 0.25 degrees 0.09 sec
15yd 0.12 inches up 0.40 degrees 0.14 sec
20yd 0.03 inches up 0.55 degrees 0.19 sec
25yd 0.06 inches down 0.70 degrees 0.24 sec
30yd 0.15 inches down 0.85 degrees 0.29 sec
35yd 0.24 inches down 1.00 degrees 0.34 sec
40yd 0.33 inches down 1.14 degrees 0.39 sec
45yd 0.42 inches down 1.29 degrees 0.44 sec
50yd 0.51 inches down 1.44 degrees 0.48 sec
55yd 0.60 inches down 1.59 degrees 0.53 sec
60yd 0.69 inches down 1.74 degrees 0.58 sec
65yd 0.78 inches down 1.89 degrees 0.63 sec
70yd 0.87 inches down 2.04 degrees 0.68 sec
75yd 0.96 inches down 2.19 degrees 0.73 sec
80yd 1.05 inches down 2.34 degrees 0.78 sec
85yd 1.14 inches down 2.49 degrees 0.83 sec
90yd 1.23 inches down 2.63 degrees 0.88 sec
95yd 1.32 inches down 2.78 degrees 0.93 sec
100yd 1.41 inches down 2.93 degrees 0.98 sec
Here is a table with a slower bow....closer to average speed.
Arrow speed (downrange): 81.55 m/s -- 267.55 fps
Time to reach 20 meters: 0.24 sec
Time to reach 40 meters: 0.48 sec
I calculated the following sight marks (relative to 20.0 m sightmark):
for 18 meters, move sight pin 0.13 cm up (time in flight = 0.21 sec)
for 30 meters, move sight pin 0.65 cm down (time in flight = 0.36 sec)
for 50 meters, move sight pin 1.95 cm down (time in flight = 0.60 sec)
for 70 meters, move sight pin 3.26 cm down (time in flight = 0.85 sec)
for 90 meters, move sight pin 4.57 cm down (time in flight = 1.10 sec)
Detailed sight mark table, relative to 20.0 m sightmark:
Distance Sight pin offset Launch angle Time in flight
10m 0.65 cm up 0.36 degrees 0.11 sec
15m 0.32 cm up 0.58 degrees 0.18 sec
20m 0.00 cm down 0.79 degrees 0.24 sec
25m 0.32 cm down 1.00 degrees 0.30 sec
30m 0.65 cm down 1.21 degrees 0.36 sec
35m 0.97 cm down 1.42 degrees 0.42 sec
40m 1.30 cm down 1.63 degrees 0.48 sec
45m 1.63 cm down 1.84 degrees 0.54 sec
50m 1.95 cm down 2.06 degrees 0.60 sec
55m 2.28 cm down 2.27 degrees 0.67 sec
60m 2.60 cm down 2.48 degrees 0.73 sec
65m 2.93 cm down 2.69 degrees 0.79 sec
70m 3.26 cm down 2.90 degrees 0.85 sec
75m 3.58 cm down 3.12 degrees 0.91 sec
80m 3.91 cm down 3.33 degrees 0.97 sec
85m 4.24 cm down 3.54 degrees 1.04 sec
90m 4.57 cm down 3.75 degrees 1.10 sec
95m 4.90 cm down 3.97 degrees 1.16 sec
100m 5.23 cm down 4.18 degrees 1.22 sec
Detailed yard sight mark table, relative to 20.0 m sightmark:
Distance Sight pin offset Launch angle Time in flight
10yd 0.28 inches up 0.33 degrees 0.10 sec
15yd 0.16 inches up 0.52 degrees 0.16 sec
20yd 0.04 inches up 0.71 degrees 0.22 sec
25yd 0.07 inches down 0.91 degrees 0.27 sec
30yd 0.19 inches down 1.10 degrees 0.33 sec
35yd 0.31 inches down 1.29 degrees 0.38 sec
40yd 0.42 inches down 1.49 degrees 0.44 sec
45yd 0.54 inches down 1.68 degrees 0.50 sec
50yd 0.66 inches down 1.87 degrees 0.55 sec
55yd 0.78 inches down 2.07 degrees 0.61 sec
60yd 0.89 inches down 2.26 degrees 0.66 sec
65yd 1.01 inches down 2.46 degrees 0.72 sec
70yd 1.13 inches down 2.65 degrees 0.78 sec
75yd 1.25 inches down 2.84 degrees 0.83 sec
80yd 1.36 inches down 3.04 degrees 0.89 sec
85yd 1.48 inches down 3.23 degrees 0.95 sec
90yd 1.60 inches down 3.43 degrees 1.00 sec
95yd 1.72 inches down 3.62 degrees 1.06 sec
100yd 1.84 inches down 3.82 degrees 1.12 sec
LC