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gmcjetpilot
Joined: 04 Nov 2006
Posts: 170
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 Posted: Tue Jan 16, 2007 11:49 am Post subject: Learning Basic Aileron in RV (HOW TO DO LOOPS) |
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Dear Acro Want-to-be's:
PART II - Loops
Again the prerequisites are: you are current and can
fly all private pilot maneuvers, steep turns, stalls
(accel, power on/off) and slow flight to name a few.
If not go practice all Pvt maneuvers till you are
comfortable.
LOOPS
The other famous maneuver is the Loop. Again
140 mph entry is fine. It starts with a
maximum 3 G pull-up. As suggest, get a G-
meter to learn what that feels like. (YOU NEED
A G-meter) Just start with learning what a 3G
pull feels like. Similar to the roll practice.
Starting a 3G pitch up to and recover. It is not
a jerk maneuver but a smooth rapid pull about 2
to 3 seconds or so.
Note: A loop and roll entry are similar but
DIFFERENT. The roll set up or initial pitch up
you do smoothly and can be very near 1G;
there is no need to pitch up as abruptly as you
will need to for a loop. In a loop however if
your initial pitch up G's are too low you might
stall before getting over the top. As you get
more advanced in aerobatics you will see
there are similar elements in all maneuvers.
At the beginning of the loop you will have the
max back pressure, it will be less thru the first
1/2 of the loop and than build on the back half,
where at the end or bottom of the loop you will
have the same back pressure as you did at the
entry. The start and end heading, airspeed and
altitude should be the same.
After initial pitch up (max g's), stick pressure
relaxes slightly but deflection may increase a
little; This is because as airspeed varies control
pressure changes. By looking outside the plane
you determine the pitching rate. It should be
constant. Remember you go from near 140mph
to near stall in the 50's mph, so control
pressure and control response change
throughout.
Pilots getting a commercial rating do lazy 8's
and chandell's. This teaches you to adjust input
based on speed while looking outside to control
the plane. These are not aerobatic, you never
go upside down, but they are great practice
leading to aerobatics. Get an instructor to
show you these maneuvers.
The entry is important. Too much elevator
(G's) or initial pressure will make a very tight
loop. This can result in excess airspeed and
altitude loss at the end of the loop. If you
really pull hard and keep the pressure up you
can do an accelerated stall in the vertical-
plane. Not what you want.
Too little pressure at the entry and you will not
get over the top and will stall or roll off
potentially. The idea is to make a perfect circle.
Unfortunately most, including myself, make
oval or egg shape loops. The best way to solve
that is with a ground observer, coaching you
over a radio as you do maneuvers. However for
fun a basic loop can be done well under 3g's,
egg shaped and all.
As the loop progresses you will lose the horizon
over the nose so you need to look over you
head, behind you and mostly look off to the
right and left wing tips, to keep the wings level.
On the top of the loop, too much back pressure
can cause a stall buffet. The recovery is relax
the back pressure (as you do right side up).
When you are upside down you can check the
road or your refrence point and make
coordinate rudder aileron input to keep on
heading.
(Key pick gnd landmarks for all maneuvers)
If you have a fixed prop you may need to make
adjustments all the way thru to keep the rpm
w/in limits. I have a constant speed prop, set
RPM and forget it (nice).
Consider buying a parachute. WHY? You are
making big control deflections and loading the
airframe over 50% of its limit strength. Things
jam and parts break. Also you may screw up
and pull the wings or tail off. Acro can be very
safe and fun, but there are risks. Consider the
acro groups like IAC (EAA) and books on the
subjects.
Also you have to look for traffic when doing
loops and rolls. Know they self. If you are a
master of your plane, can land, takeoff in gusty
X-winds, do all the private pilot maneuvers
well, within the standards, you are ready. If
you are weak in any area you should practice
honing your basic pilot skills before doing acro.
However Acro improves your skill and
confidence. FOLLOW THE RULES, COMMON
SENSE, BE CONSERVATIVE and have FUN.
Go buy and read some acro books.
Do at your own risk, solo with a chute.
Never start a maneuver below 3000 ft agl.
Cheers George
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kboatright1(at)comcast.ne
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| Posted: Tue Jan 16, 2007 3:19 pm Post subject: Learning Basic Aileron in RV (HOW TO DO LOOPS) |
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I have not tried initiating a loop at 140 mph and 3 G's, so the following is just my opinion:
In my light RV-6 with a 160 hp engine and a cruise pitched prop, I do not believe the airplane would make it over the top of a 140 mph/3 G loop. Instead, I'd get to experience a full power departure stall while inverted. My entry speed and initial target G are both higher than 140/3...
If you want to use internet advice for acrobatics (which ain't a good idea, by the way), make sure you are talking with someone who has an airframe/engine/prop combination that is very similar to yours.
I'm sure a light RV-4 with a constant speed prop can be looped from far slower speeds than my airplane.
KB
[quote] ---
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dan(at)rvproject.com
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| Posted: Tue Jan 16, 2007 4:06 pm Post subject: Learning Basic Aileron in RV (HOW TO DO LOOPS) |
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You can't stall if you have no angle of attack...
do not archive
[quote] ---
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rocketbob(at)gmail.com
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| Posted: Tue Jan 16, 2007 6:18 pm Post subject: Learning Basic Aileron in RV (HOW TO DO LOOPS) |
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You can fly well below the stall speed at zero-g. If you feel the onset of a stall at the top of a loop, unload the airplane and you won't stall. I have done rolls at the top of a loop at zero-g below the stall, what's neat about zero-g is there is no adverse yaw so when you roll out you be spot-on your intended heading. Whenever I do ballistic rolls I always unload the airplane, and can watch the ball stay close to center without touching the pedals, and end up on heading, feet off the pedals.
Regards,
Bob Japundza
RV-6 flying F1 under const.
On 1/16/07, Kyle Boatright <kboatright1(at)comcast.net (kboatright1(at)comcast.net)> wrote:[quote] I have not tried initiating a loop at 140 mph and 3 G's, so the following is just my opinion:
In my light RV-6 with a 160 hp engine and a cruise pitched prop, I do not believe the airplane would make it over the top of a 140 mph/3 G loop. Instead, I'd get to experience a full power departure stall while inverted. My entry speed and initial target G are both higher than 140/3...
If you want to use internet advice for acrobatics (which ain't a good idea, by the way), make sure you are talking with someone who has an airframe/engine/prop combination that is very similar to yours.
I'm sure a light RV-4 with a constant speed prop can be looped from far slower speeds than my airplane.
KB
[quote] ---
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