Control input during loop

In article , MLenoch
wrote:

It flies best with an initial pull of 4 G. G is not constant during the
loop.
It may be half a G at the top. On cooler days, I can fly the loop at 3 Gs for
the initial pull; it is easier on the 50+ year old wing. But, when not doing
low level airshow loops, 3 G loops are always OK at higher altitudes. The
problem is getting too slow at the top, which is uncomfortable during an
airshow display.

Two more question, if I may...
What has the airspeed at the top of the loop decayed to with 4G pull?
With 3 G?

100LL fuel limits the engine to 55" on takeoff to prevent detonation. The
current owners today (non-racers) seldom get above 400 mph. Most of them seldom
do aerobatics and thus likely never get above 350 mph. The commonly know speed
limit is still at 500mph. There are about 120 airframes flying in the US, with
about 300+ still in existance worldwide. Cruise is flown at 35" which produces
220kts/240mph approximately......depending on ambient, bomb rack installed,
antennas, etc. That's about 55% power. Like John said, it needs speed to get
over the top of a loop, otherwise it can stall and depart.
VL

Two more question, if I may...
What has the airspeed at the top of the loop decayed to with 4G pull?
With 3 G?

At 4G......110 kts is OK and preferrable. At 3G, you can get it to float over
at 80 to 90 kts. Also, just depends on how long the G pull is sustained during
the ride up, as well.
VL

At 4G......110 kts is OK and preferrable. At 3G, you can get it to float
over
at 80 to 90 kts. Also, just depends on how long the G pull is sustained
during
the ride up, as well.

At OSH each year, where you get to see a variety of WWII fighters doing
fly-bys during the Warbird show, I've noticed that some Mustang pilots are
considerably less aggressive on the pull-up and wing-over than others. I've
often wondered if this is a limitation of that particular aircraft, or if
that particular pilot is simply taking it a bit easier on himself and the
bird.

The most aggressive pull-ups I've seen are with that red Corsair racer and
the Bearcats. Their vertical penetration (and ability to sustain the climb
through the top of the half-loop) is most impressive.

I always kinda feel sorry for the occasional P-40 and early naval fighters
that participate, since they obviously can't keep up with you guys... :-)

As always, I (for one) appreciate you discussing this on-line with us Spam
canners...
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

Vlado,

Rudder? Rudder? I thought you only used that thing on the ground
g.

My understanding is gyroscopic precession. When the tail comes up on
takeoff on clockwise rotating props the force applied to the rotating
prop is forward at the top, aft at the bottom, so it reacts 90 degrees
around the plane of rotation, and thus causes a left turning tendency.
On the pull up for a loop, the effect is reversed, requiring some
left rudder. Seems to be the case on the Citabria and Decathlon as
well.

You going to park it for the winter as you used to do in AZO?

Warmest regards,
Rick

(MLenoch) wrote in message ...
I must admit, for years I have been doing such but never asked why. Why do I
need to use left rudder to keep the nose straight during a loop? I have a US
airplane, with normal prop rotation. If I do not use left rudder, the nose
will yaw to the right. This is not due to P-factor?
Thx in advance.
VL

As always, I (for one) appreciate you discussing this on-line with us Spam
canners...

Very much enjoy sharing........after, that's where I started too!


I've
often wondered if this is a limitation of that particular aircraft, or if
that particular pilot is simply taking it a bit easier on himself and the
bird.

Some pilots are a little less "current" than others. In others words, they
don't fly as much and don't know how hard to pull up or are a bit scared &
unfamiliar at the same time. Just everyone's nature is different.

VL

You going to park it for the winter as you used to do in AZO?

Warmest regards,
Rick

Warm regard - winter............Its a joke right!!

(Yes, I'll be at AZO.)
Thx,
VL