In
Eight's on Pylons (Page 6-12), your pivotal altitude changes as you circle the ground reference point on your wing tip (or, in my case I use the light wick). Unlike Turns About a Point or Eight Across a Road, your bank angle changes more drastically along with altitude. You'll descend to keep your point from going ahead of the wing tip and climb to keep it from going behind. Consequently, you can have a wide range of altitude.
The formula for determining what your altitudes will be is: "Ground speed squared/11.3."
If I have a 30 knot wind as we had yesterday, I'll start with Va approximate to my aircraft weight (105 kt IAS for myself and CFI in a R182). Then my ground speed will vary from 75 to 135.
At the fastest: (135*135)/11.3 = 1613 feet AGL
At the slowest: (75*75)/11.3 = 497 feet AGL
If done in a slower aircraft, you can see how much lower the pivotal altitude can take me. That might be fine over the wheat fields of Kansas but around here you're gonna hit something. A chicken barn, silo or something. My preference is not to go under 800 feet AGL unless I'm doing a simulated emergency landing and the cutoff there is usually 500 feet.
Add to this, the wide variation in altitude along with steep bank at the peak can set you up for disorientation and/or possibly a sick DPE. While it can be done, why go to that limit? What am I proving? I'm gonna gain a heck of a lot more respect from that DE by rejecting the wind than proving I can accomplish it in these conditions.
I hope I explained this well enough (CFI's chime in!
) One of the objectives of this and other commercial maneuvers is "division of attention" while flying the airplane and maintaining control. This is something which could be (and probably should be) added to PP as well as IR training. I'm betting division of attention issues is a large contributing factor in accidents during maneuvering flight.