Van's
RV 3
by
Budd Davisson, courtesy of
www.airbum.com
August, 1973, Fond du Lac,
Wisconsin. Climbing out of
the Van Grunsven RV-3
after my first flight, it
struck me how incredibly
far the art of
homebuilding has
progressed. There was a
time, not long ago, when
the term homebuilt meant
an airplane that could go
like blazes, but came down
final with all the grace
and docility of a torpedo.
Or, if it were a slow,
easy-to-land airplane, it
couldn't outrun an
asthmatic hummingbird. It
was axiomatic that a
homebuilt airplane usually
(note, I said usually)
couldn't handle both ends
of the speed or talent
spectrum. It was either a
fast, raunchy-handling
dude, or a slow, rather
matronly machine. But the
times are changing.
In the past few years,
several designs have
popped up that turned out
to be a little faster than
it seemed they ought to
be, but were still fairly
easy to fly. They didn't
represent any quantum jump
in either direction,
though. Then the RV-3 came
along, and the old saying
about "airplanes fly like
they look" was twisted
into scrabble. Everything
that gut-engineering says
about the RV-3 is wrong. A
little old-time homebuilt
savvy applied to the RV-3
says it's going to be
fairly fast for its
horsepower, 150 mph maybe,
but it also looks as if
it'll need around 90 mph
on final and will skip and
skitter on the runway
after touching down at 65
to 70 mph. Wrong in every
department. It's far
faster than it looks, and
its low-speed envelope
belongs to a
fabric-covered putt-putt,
rather than an all-metal,
barn yard bullet. The RV-3
may just be the best of
the new breed of
homebuilts. (Note from
2003: Man! Am I prophetic
or what?)
In some ways, Richard Van
Grunsven himself
represents a new breed of
homebuilder: the
professional homebuilder.
A trained mechanical
engineer, he bailed out of
the job market and decided
to do what he liked
best—design and build
airplanes. Now he's one of
dozens of guys around the
nation who design and
build, draw up plans, tool
up for producing parts and
cast their bread upon the
waters of sport aviation.
In the midst of the
current hoopla as various
promoters try to corner
their share of the
homebuilding buck, Van
Grunsven comes on like a
monk. He's one of the most
understated salesmen in
the business. He's so
quiet and soft-spoken that
he sounds almost
apologetic for building
such a pretty little
high-performance airplane.
The only time he gets an
edge in his voice is when
he tries to impress his
listeners with the honesty
and accuracy of his
claims. He's terrified
he'll be lumped in with
the designers who make
claims of fighter
performance when their
airplanes are
run-of-the-mill pattern
ponies. It anybody wonders
how he arrived at a
particular performance
number, he'll eagerly
search through the reams
of notes he made while
conducting hundreds of
tests, measuring takeoff
distances, calibrating
airspeeds and verifying
numbers.
His concern about people
doubting his performance
specs should have
disappeared when he not
only won, but set an
all-time record for the
Pazmany Efficiency Contest
this year at Oshkosh. His
top speed in a level run
was over 207 mph, measured
from the ground, and his
slow speed was 53.8 mph!
How's that for a
performance envelope? His
score was 11.77 with the
closest competitor at
10.45, and the average
around 6.8. His efficiency
index is the highest
recorded since the contest
was begun several years
ago. That means he is not
only squeezing those 125
ponies to make them run,
but has a way of keeping
the airplane flying at a
ridiculously low speed.
This year was the second
showing of the RV-3 at
Oshkosh, and even though
it's an incredibly pretty
machine, it didn't attract
nearly the audience it
should have. Because it
doesn't have the exotic
appeal of a negative
staggered triplane, or a
one-eighth-scale B-36,
it's easily overlooked. It
has conventional sheet
metal construction with
tapered steel Wittman-type
landing gear and a 125-hp
Lycoming ground power unit
(Again from 2003:
notice the engine, you
horsepower freaks and it
still really performs).
With 90 square feet of
wing area (nearly the same
as a two-place Thorp
T-18), it's slightly
larger than most
homebuilts, but even so it
doesn't stand out at a
crowded air show. It's
only when you take it away
from the crowd that the
true beauty of the
airplane shows up.
Aesthetically, it might
look better with tapered
wings, since its
Hershey-bar planform looks
a little out of place with
the, sleek racer-type
fuselage, however, the
square wing means only one
size rib and one formblock
per side. Part of Van
Grunsven s business (Van's
Aircraft, Forest Grove,
Oregon) is manufacturing
fiberglass aircraft parts,
so it's only natural that
the wheelpants, Hoerner
type wingtips and
shark-nosed cowling are
also available.
The thought and planning
that shows on the outside
extends to the cockpit as
well. Although spartan in
appearance, there is
plenty of room for
comfort, but not enough to
slow the airplane down. As
I strapped it on, I was
surprised to find it much
roomier than I had
imagined. I even needed an
inch of folded sectionals
behind the seat cushions
to get close enough to the
rudder pedals. There was
also more than enough
headroom with the canopy
closed.
The layout of the cockpit
itself is 100 percent
conventional. Everything
is where you'd expect to
find it in any airplane,
positioned so they're easy
to find. My only minor
complaint with the control
layout was that the
carburetor heat was on the
right side of the cockpit,
requiring me to cross over
with my left hand, or
change hands on the stick
to get it.
One rather unusual aspect
of the control system,
however, was a set of
springs attached to the
base of the stick, on
either side, that served
to keep it centered. Van
Grunsven explained that
this was because he'd gone
slightly overboard in
balancing the ailerons, so
there was no feeling of
neutral aileron in flight.
And for the first few
degrees of stick movement,
the overbalanced condition
felt like power steering.
He's corrected this in his
plans.
About 70 percent of the
homebuilts around have at
least one or two strange
ground handling
characteristics built in
by the owners. Not so with
the RV-3. Everything is so
well set up that anybody,
tailwheel pilot or not,
could herd it around the
runways. It's not often
that I have confidence in
an airplane before
takeoff, but I felt that
the easy ground handling
of the RV-3 was a good
Omen.
The takeoff was something
else. It's not the
acceleration that's
surprising, it's the way
it gets off the ground
before you finish putting
the throttle in. It was
fairly late in the evening
when I took off, so there
was no wind to help me
off. Even so, I barely had
the throttle all the way
in and was just beginning
to raise the tail when it
lifted off three-point The
The RV-3 needed only 200
feet to get up enough lift
to go flying. If that
isn't ST0L, I don't know
what is.
It's one thing to get off
short, but it's something
else entirely to get over
an obstacle. Nevertheless,
the RV-3 shines there,
too—If you take off in a
three-point attitude, you
have to pull the nose up
even further to keep the
speed down. I timed the
climb at something over
1,800 fpm with an angle of
around 20 to 30 degrees.
The ailerons aren't light,
they're super light!
Because of the
overbalanced control
surfaces, there Is
practically no feel at all
to the stick. It would
move by itself if the
centering springs weren't
at work. But don't get the
idea that the ailerons
make the airplane tough to
fly. They may be light,
but stick travel is falrly
long, so there's no
tendency to over control.
The control ratios are so
well worked out, and the
airplane so stable that I
didn't even notice the
super light ailerons until
I started to turn out of
the pattern. (BD 2003
note: the fix resulted in
almost perfect aileron
feel. RV’s have very, very
nice ailerons.)
The first thing I did when
I got outside the pattern
was set up a level cruise
and start zipping across
the parallel section lines
below while watching the
sweep second hand on my
Micky Mouse special. I was
going to find out for
myself whether Van’s
claims wore true. At
different power settings,
all of them between 2100
and 2500 rpm, I got speeds
between 155 mph and 175,
mph. At about 75% power he
claimed 170 mph and 9 to
10 gallons/hour and I was
doing better than that.
One thing is for sure. the
RV-3 will climb like
crazy. As I finished the
last high-speed run, I
tweaked the stick back and
rammed the power in,
dissipating speed in a
zooming climb. the
altimeter hand started
wrapping around, and by
the time the IAS was down
around climb speed, 90
mph, I'd picked up over
1,500 feet. At that rate,
it took only a couple of
minutes to get enough
space between me and
Wisconsin to keep me
comfortable during the
upcoming test session.
What would a test flight
be without some stalls? I
was in a hurry to get on
to the juicier manoeuvres,
so I chopped power and got
carb heat, holding the
nose up all the while.
Then I waited, and waited.
It took forever to get
down under 50 mph, where
it shuddered once, ever so
slightly, and dropped its
nose hard, as if trying to
live up to the reputation
many feel the NACA 21012
airfoil deserves. It broke
sharply, but rather than
recovering, I held the
stick back, curious to see
what would happen. The
nose fell a few feet, the
airplane picked up speed
and started flying again
then porpoised up into
another stall. I was
losing very little
altitude as I seesawed up
and down from stall to
stall, keeping the wings
level with both aileron
and rudder. The stall was
sharp and with little
warning, but recovery was
instantaneous and the
airplane didn't try to do
anything weird like
tucking a wing.
Feeling as if I had
discharged my duty as a
flight evaluator, I did a
screaming 360-degree turn,
clearing for traffic, and
pulled the nose up. I
twitched the stick to one
side and the small town on
the distant horizon
obediently curved up and
over the nose. The rolls
were indecently easy, so I
started doing four points,
then eight points, and
finally a 15 point (I
never could keep track in
those things). The plane
would jerk to a halt so
cleanly that I could
almost hear each point
squeak. The rate of roll
was so high, and the speed
bleed-off in verticals so
low, that I soon found
myself doing loops with
slow rolls on the top,
Immelmanns and Cuban
eights with double and
triple rolls on the
recovery requiring nothing
more than putting the
stick to one side at the
appropriate time.
Richard Van Grunsven had
warned me that it didn't
snap roll very well, and I
proved him right, again
and again. It would start
around like a good little
airplane, but then the
wing would start flying
again and swoop out of the
last 90 degrees or so. For
an airplane to snap roll
well, it has to be
high-speed stalled by
jerking the slick back and
then kicked into a
horizontal spin with full
rudder in the direction of
the roll. The RV-3 has a
wing that almost refuses
to stall quickly, probably
because of the planform
and light wing loading.
Elevator effectiveness
might have something to do
with it, too, but I was
getting as much as 4.5Gs
trying to snap at 90 mph,
so it seemed to have
enough elevator. It would
probably take nothing more
than a couple of stall
strips taped to the
leading edges to make it a
snap-rolling fool. It does
everything else so nicely,
it would be worth the
experimentation to make it
snap roll equally well.
Even in its present form,
it would make d good
competitive mount for
anyone wanting to play In
Sportsman or Intermediate
category aerobatics (2003
note: forget about
intermediate category
today. It has gotten far
too demanding for the RV.)
The spins also were
strange, primarily because
I couldn't hold the RV-3
in one. It would do about
one turn and then fly out
into a spiral like a
Cherokee. I finally got it
to spin a little longer by
using some power. Van
Grunsven says it'll do a
dandy flat spin with power
and crossed controls, and
stop exactly when you want
it to. I didn't know that
at the time, which was
just as well because I've
always put flat spins in
the same category as
alligators when thing when
it comes to fun.
Somehow, as I turned into
the pattern, I knew the
landing was going to be no
sweat. The hardest part
was to force myself to
approach at only 70 mph
indicated. Van Grunsven
said even 60 to 65 mph was
okay, but 70 mph made me
feel as if I were
crawling—it was unnatural.
I kept moving my patterns
out until I could make a
comfortable power-off 180°
approach, using flaps to
get rid of altitude when I
wanted.
I made the first landing a
wheelie, just to see what
would happen—it was
beautiful. I held it off
and let it settle on main
gear first, feeding just a
little forward stick in to
keep it planted when the
tires touched. That
springy Wittman-type gear
took up any bounce and let
me motor straight ahead
with no effort. The next
couple were
three-pointers, and were
noteworthy for only two
reasons. During the flare,
the airplane slows to a
porcupine pace, and my
mother could control the
rollout.
Everything about the way
the airplane flies is
slightly out of character
with Its appearance, but
its landings are too good
to be true. In a
three-point, you don't
roll more than 200 to 300
feet, and you could be
manicuring your toenails
through the whole thing.
It ranks with a Fly Baby
or a Citabria for
docility, but is actually
easier to land than
either, especially when
you consider that you were
blasting along at 170 mph
only moments before.
Fantastic', If you can fly
any taildragger, you've
got the RV -3 knocked.
I don't remember when I've
had more fun in an
airplane. Everything about
it is pure pleasure. You
can be screaming along,
nudging 200 mph, then slow
down to 110 mph and slide
the canopy hark to suck in
the fresh air and play
airmail pilot. You can
spend the afternoon
rehearsing your Gene Soucy
imitation and then spiral
down to land on a 600-foot
strip, turn off at
midpoint, and climb out
feeling like a missionary
pilot in Patagonia. It
handles so well in so many
different regimes that it
borders on the
unbelievable, and if I
weren't the one writing
this, I wouldn't believe
it.
The old axiom about all
airplanes being
compromises wilts a little
when the RV-3 Is studied
closely. Van Grunsven uses
the term total performance
to describe it. Until I
flew the airplane, I
didn't honestly believe
him. Now, I do. It really
is an everything airplane
for the anything pilot.
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