View Full Version : Popham
Could somebody please tell me the gradient of runway 21 at Popham?
skippyscage
6th Jul 2002, 23:44
well it's UP if that helps :D
why you ask?
Genghis the Engineer
7th Jul 2002, 09:15
I'm not sure if it's published anywhere, but from memory I think it's about 3%
G
doesn't give the exact details on the website for the airfield
Popham (http://www.popham-airfield.co.uk/)
skippyscage
"why you ask"
Because I would have thought that it was quite important. What do people use in their performance calculations? (watching some of the departures it is obvious that some people don't bother with performance calculations).
Most spamcans have a certification limit of two degrees. If, as I suspect, the gradient of this runway is three degrees then these aircraft are taking off outside their performance limits, and their insurance would be invalid.
If the aircraft is group owned then the group members could be jointly liable to any claim.
distaff_beancounter
7th Jul 2002, 20:20
Just received my copy of the CAA's new book LASORS 2000 (good value of a fiver)
(BRL I would not dream of advertising on behalf of the CAA!)
Page 494 reprints the performance factors, from the Safety Sense leaflet & AICs.
According to that:-
For a 2% uphill slope, the takeoff distance is increased by 10%
I seem to recall, from somewhere, that it is not correct to assume therefore, that a 3% upslope would increase the take off distance by only 15%.
Isn't the calculation of the increase far more complicated than that? (So that 3% would give an increase of FAR more than 15%?)
Any of you techie minded people out there, know the answer please? :confused: