calculate the rate of climb for an aircraft
Thread Starter
Joined: Jan 2014
Posts: 7
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From: Dublin
calculate the rate of climb for an aircraft
Calculate the rate of climb for an aircraft operating at 3000ft OAT 0C.
Conditions-
Flap Up
Landing Gear Retracted
Full Throttle
Can Someone please give me the Formula for this calculation ?
Conditions-
Flap Up
Landing Gear Retracted
Full Throttle
Can Someone please give me the Formula for this calculation ?
Joined: Dec 1999
Posts: 3,077
Likes: 1
From: Oop North, UK
Normally done from tables rather than formula, example here:-
http://selair.selkirk.bc.ca/training...appendix14.pdf
http://selair.selkirk.bc.ca/training...appendix14.pdf
Joined: May 2005
Posts: 1,115
Likes: 4
From: Yorkshire
Foxmoth is right.
Rate of climb for given conditions is not calculated by a formula, but by reference to charts or tables like the ones he has posted. These are derived from flight test results adjusted for varying conditions, and can be found in your Flight Manual or Pilot's Operating Handbook. (POH)
Can I ask, are you studying for a PPL or do you have one already?
If you are studying for the Performance and Planning exam, then graphs, charts and tables will be provided for you to work out things like rate of climb.
MJ
Rate of climb for given conditions is not calculated by a formula, but by reference to charts or tables like the ones he has posted. These are derived from flight test results adjusted for varying conditions, and can be found in your Flight Manual or Pilot's Operating Handbook. (POH)
Can I ask, are you studying for a PPL or do you have one already?
If you are studying for the Performance and Planning exam, then graphs, charts and tables will be provided for you to work out things like rate of climb.
MJ
Joined: Aug 2000
Posts: 1,214
Likes: 0
From: S Warwickshire
I'm guessing that our OP isn't very far along their PPL and has been looking at some sample questions and wasn't sure how to approach them.
The data supplied in the POH or flight manual will likely have climb rate tabulated for weight, altitude and delta-T(ISA).
At 3000' the standard temperature will be 9°C so the delta(T) will be -9°. For practical purposes you could use -10° as there will probably be tabulated or plotted for 10 degree steps. There may be additional tables or graphs for different configurations of flaps and undercarriage, so make sure you are looking at data relevant to the clean configuration.
The point about interpolation is valid, as strictly you will likely only have figures for ISA and ISA-10° and the value for ISA-9° will be estimated by linear interpolation.
E.g. if you have 1000' ft/min at ISA and 1100 ft/min at ISA-10° then interpolation would estimate 1090 ft/min at ISA-9°. (colder air is more dense so increases the power available and hence the climb rate).
The data supplied in the POH or flight manual will likely have climb rate tabulated for weight, altitude and delta-T(ISA).
At 3000' the standard temperature will be 9°C so the delta(T) will be -9°. For practical purposes you could use -10° as there will probably be tabulated or plotted for 10 degree steps. There may be additional tables or graphs for different configurations of flaps and undercarriage, so make sure you are looking at data relevant to the clean configuration.
The point about interpolation is valid, as strictly you will likely only have figures for ISA and ISA-10° and the value for ISA-9° will be estimated by linear interpolation.
E.g. if you have 1000' ft/min at ISA and 1100 ft/min at ISA-10° then interpolation would estimate 1090 ft/min at ISA-9°. (colder air is more dense so increases the power available and hence the climb rate).
