Part 9 of my series on how to use the CRP-5. This video covers basic altimetry theory, using the CRP-5, and a useful equation to calculate density altitude.
Thanks for this video. It was helpful as I have not used the CRP-5 in depth. I have a question though.. In your example you stated OAT = 30 deg C and elevation 4500ft , but you did not use the ISA Deviation. In your example for 2000ft, you used the ISA deviation. So I just need you to clear up whether you meant the deviation is 30 degrees or actual temperature is 30 degrees else its a bit conflicting? In the equation however it is clear that we should use the ISA Deviation - its just the CRP 5 that I want to know if we should use the ISA Dev. or the Actual reported OAT?Thanks
If I remember correctly. In both examples I actually used the actualy outside air temperature, not the deviation. The CRP-5 is designed to do the ISA deviation automatically. Just set the actualy temperature against the pressure alt. The rest is done for you.
I don't believe there is much of a difference between the CRP-1 and 5 apart from the lack of compressibiliy correction, RAM rise scale and one or two speed conversions. The scales should all be as accurate as each other.
