How Low to Spin??

Eric Greenwell wrote:

Just to be clear here, the convention is: 0% is at the front of the
range; 100% is at the aft end of the range. It sounds like you have it
backwards.

My mistake. I wasn't expecting you to have flown
aircraft in such an aft CG range, and inverted it in my mind.

Really. So the aircraft were in the aft 1/3 of the range?
And still wouldn't stall at 45 deg bank? Interesting...

I believe you, I'd just like to see this myself as well.

As far as stalls in a steep bank, without uncoordinated
inputs, I've noticed many aircraft roll wings level,
just like the GFH and AFH (and Marc, it seems) say...

One thing I haven't tried that I recall is banking into
a turn and then just failing to take rudder out
while rolling level at a high rate (all while at low
airspeed). This should get a nice spin entry too...

Maybe there are spin fatalities in this category too...steep
bank close to the ground, more elevator to tighten the
turn to final, then an attempt at a quick roll to level wings...
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Mark Boyd
Avenal, California, USA

Mark James Boyd wrote:

Eric Greenwell wrote:

Just to be clear here, the convention is: 0% is at the front of the
range; 100% is at the aft end of the range. It sounds like you have it
backwards.


My mistake. I wasn't expecting you to have flown
aircraft in such an aft CG range, and inverted it in my mind.

Really. So the aircraft were in the aft 1/3 of the range?
And still wouldn't stall at 45 deg bank? Interesting...

70% is a common CG location, because (for many/most gliders, especially
the newer they are) the glider handles pleasantly, recovers easily from
spins, and is close to the optimum CG for cross-country performance.


I believe you, I'd just like to see this myself as well.

The limit on elevator "authority" isn't so much the force it can
generate (except at the most forward positions) but more the angle of
attack reduction on the elevator that occurs in steep turns. I'm sure
the bank angle you can stall at is higher with a more aft CG, but in the
commonly used 60-80% range, you do run out of elevator in the steeper turns.

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Change "netto" to "net" to email me directly

Eric Greenwell
Washington State
USA