1 in 60 rule to find GS without being given distance?
Posted: Sat Dec 02, 2017 11:51 pm
Hey there,
I'm stuck on a problem that requires me to find an approximate groundspeed using1 in 60 rule.
Passing the Chetwynd beacon you wish to check your groundspeed. You tune into the Chetwynd beacon and observe an 8' relative bearing change in 40 seconds. Your approximate groundspeed as can be estimated using the 1 in 60 rule is?
a) 100 knots
b) 80 knots
c) 120 knots
d) 60 kots
the answer is 100 knots but I can't seem to figure out how to come to that answer.
Using the formula for time to station, I got 5minutes to the station but without being given any sort of distance, I'm lost.
The closest answer I've come to was 96 knots but I wasn't sure if I got that number doing the right thing.
Here is how I ended up with the answer 96 kts.
TTS: 40/8= 5minutes
DTS: (TASxTTS)/60
DTS= 8 since we will be 8nm miles away from the beacon if we were to fly with constant heading for 60nm.
Therefore, 8=(TASx5)/60
TAS= 8x60/5=96
Is this the right way of solving the problem above or did I just get lucky with the numbers and ended up somewhere close to the answer 100kts?
Thanks in advance!!
I'm stuck on a problem that requires me to find an approximate groundspeed using1 in 60 rule.
Passing the Chetwynd beacon you wish to check your groundspeed. You tune into the Chetwynd beacon and observe an 8' relative bearing change in 40 seconds. Your approximate groundspeed as can be estimated using the 1 in 60 rule is?
a) 100 knots
b) 80 knots
c) 120 knots
d) 60 kots
the answer is 100 knots but I can't seem to figure out how to come to that answer.
Using the formula for time to station, I got 5minutes to the station but without being given any sort of distance, I'm lost.
The closest answer I've come to was 96 knots but I wasn't sure if I got that number doing the right thing.
Here is how I ended up with the answer 96 kts.
TTS: 40/8= 5minutes
DTS: (TASxTTS)/60
DTS= 8 since we will be 8nm miles away from the beacon if we were to fly with constant heading for 60nm.
Therefore, 8=(TASx5)/60
TAS= 8x60/5=96
Is this the right way of solving the problem above or did I just get lucky with the numbers and ended up somewhere close to the answer 100kts?
Thanks in advance!!