StanFoster
Active Member
- Joined
- Nov 16, 2003
- Messages
- 17,139
- Location
- Paxton, Il
- Aircraft
- Helicycle N360SF
- Total Flight Time
- 1250
Chris- Heres a question for you. I have a nice online density alitude calculator that you punch in your altitude, temperature, barometric pressure, and dew point to arrive at your true density alitude.
My quick research showed me a density altitude chart that had an almost linear line from 0 feet to 12000 feet density altitude as far as the correction factor for airspeed. It showed that every 500 feet of density altitude gain, there is a speed multiplier of 1.0083. So if one day I had a data run showing 110 mph.... and I go repeat the exact settings the next day .......but the density altitude is 500 feet higher, I should expect to see 110 mph X 1.0083......or 110.91 mph. Do you agree with the difference?
Of course with the weather warming up now... I could collect all my data without my fairings on these colder days......then install the fairings and be testing them on higher density alitude days...and be thinking the fairings are adding many more mph...when in fact most of that would be because of density altitude.
I in the beginning was wanting to take my recordings on days with the same temperature.....but I thank you for your inputs that have heightened my awareness of also including barometric pressure and humidity as well.
I still will try to only compare data with and without the fairings taken on days with the density altitude very similar.....and still use the calculator to fine tune it.
This is teaching me a lot about data gathering.
Stan
My quick research showed me a density altitude chart that had an almost linear line from 0 feet to 12000 feet density altitude as far as the correction factor for airspeed. It showed that every 500 feet of density altitude gain, there is a speed multiplier of 1.0083. So if one day I had a data run showing 110 mph.... and I go repeat the exact settings the next day .......but the density altitude is 500 feet higher, I should expect to see 110 mph X 1.0083......or 110.91 mph. Do you agree with the difference?
Of course with the weather warming up now... I could collect all my data without my fairings on these colder days......then install the fairings and be testing them on higher density alitude days...and be thinking the fairings are adding many more mph...when in fact most of that would be because of density altitude.
I in the beginning was wanting to take my recordings on days with the same temperature.....but I thank you for your inputs that have heightened my awareness of also including barometric pressure and humidity as well.
I still will try to only compare data with and without the fairings taken on days with the density altitude very similar.....and still use the calculator to fine tune it.
This is teaching me a lot about data gathering.
Stan