I'm astonished by the rapidity of the replys.
mcdhu,
I'll fly with you anywhere
I too, am aghast at the number of pilots who will grab for the Wet Runway data when the first droplet of rain falls. I'm even more aghast at one (un-named) poster who routinely uses Wet data even for Dry runways - Fine for a RTO, but disastrous for Accelerage-Go. It would be survivable, but the court of enquiry would not see it that way. Such an act is patently ILLEGAL, as the Wet Runway concessions allow for REDUCED safety margins in these, and ONLY these circumstances.
My reference to acceleration being less than 10% of normal was in relation to Engine Inop Operation Vs All Engines Operation, which has a very large thrust excess, and thus acceleration.
If a 2 engined aircraft of 100 Kg mass must meet a minimum 2.4% Second Segment minimum Climb Gradient, then simple mathematics require that the aircraft, with one engine inoperative must have a
EXCESS thrust of 2.4% of the aircraft mass, i.e. a mere 2.4 Kg of excess thrust. Even very small thrust increases, such as is available with APR, although low, can considerably increase this excess thrust. For OEI calculations, one engine is redundant, it has failed. If it remained running for NORMAL operations, the excess thrust for acceleration would be massive, hence my assertion that in the OEI case Acceleration will be much less than normal (Normal = All Engines), and distance to achieve a particular speed very much longer. The "less than 10%" that I quoted was a 'round' figure, and very very generous!
Regards,
Old Smokey