"Morgans" wrote in message
...

"Jay Honeck" wrote

We don't have a formal "If the runway is 71% gone we'll abort" rule,
but if any of the five parameters (listed above) are not nominal, we
abort.

It might be a good idea to think about adding some type of abort limit,
such
as the 71% rule, even with the other checks you do.

The video sure has given me something to chew on. I think the spooky
thing
is that the whole takeoff looks so normal, right up to the part the wings
start to wobble, and it falls in the dumpster. Most other videos I have
seen, such as the failed takeoff in (where, Columbia, or something) look
like problems, much, much sooner.
--
Jim in NC


The nice thing about 71%, beside being memorable, is that will probably give
you somethine similar to "balanced field length" in a typical GA airplane.
The only time, in my personal experience, that an airplane was not airborn
at that point was in a Piper Tomahawk on a 2600 foot grass runway with a 20
foot obstacle at the boundary. We chickened out, tried the other direction,
chickened out again and then finally did the calculations in accordance with
the POH. Those calculations should have been done first, as we are all
supposed to do for any set of conditions not already calculated, and the
calculation revealed that we would have crashed if we had continued either
of the take off attempts. BTW, the engine sounded normal, and the
performance proved to be exactly in accordance with the POH for the weight
and conditions.

The only suggestion I have ever read that still makes a lot of sense is to
do the calculations, determine whether the field length and obstacle
clearanced are adiquate, and (presuming that a take off is still planned)
determine the location at which lift off at the correct speed should occur.
Then, if an obvious landmark is not available at the calculated take off
point, pace off the distance and place a disposable marker.

I rotation/distance counter on one of the landing wheels could be a really
nice feature, but I have never seen one.

Peter