Cessna 170: The
Skyhawk's Daddy
We all know
that the Cessna 170 is the progenitor of the
ever popular, omnipresent C-172 . Or is it?
At what point does an airplane design evolve
itself out of existence? As I was walking
around N1956C, a 1953 model Cessna 170B, I
found myself comparing the machine to the
grand-children it sired in such huge
numbers. Yes, it did look like the 172 or
vice versa, but not really. Certainly, the
tail bears no resemblance to the current
swept back version (which was probably
designed by a marketing director's wife) and
we all know that although 172s started with
the same aft fuselage, they were shortly
changed to mount the wrap-around rear
window. Also, the cowling looks a little
smaller and more pointed; probably a
function of the six-cylinder 0-300
Continental it houses. And, oh yes, the
C-172 has the tailwheel mounted at the wrong
end of the airplane. Not only is the landing
gear different, but the C-172 has gone
through two versions since 1970... leaf and
tubular springs.
Yep, the C-170 gave the
172 its start, but is it absolutely fair to
say the 172 is a warmed over 170? At this
stage of the game, with the 170 only a few
years short of being forty, I think it's
only fair to say they have evolved every bit
of the old airplane out of existence and a
1985 Skyhawk, should they decide to build
one, would be as far removed from the C-170
as the current model homo sapiens is from
Neandertal man.
Certainly, one of the
items which separates the 1985 version from
the original 1948 variety is a matter of
dollars. Lots of them! Today you can pick up
Cessna 170s starting at $9000 and going as
high as $18,000 and have yourself a
semi-classic design which does almost the
same job as the 172 which, in 1985 dollars,
runs in the neighbourhood of 75,000 big
ones. On that basis, it makes a hell of a
lot of sense to turn your eyes bloodshot
perusing Trade-A-Plane and walk your feet
sore covering outlying airports in search of
the 170 of your dreams. Two fellows who did
just that are Dave Hoover and Vern Lewis of
Sparta, New Jersey.
Not looking for a cream
puff 170, Hoover and Lewis spent their time
searching for something that would be
considered "sound"; no corrosion, a minimum
of dents and dings, and a medium to low time
engine, which wouldn't give them any
trouble. And, oh yes, one that was on the
bottom of the price range. They found N1956C
in Phoenix, closed the deal, and shortly
thereafter putt-putted across the country
back to their New Jersey home base.
I too had been flipping
through Trade-A-Plane looking for a 170 and
it was with a certain amount of surprise I
found theirs tied down no more than 50 feet
from the hangar door that protected my Pitts
from the vagaries of the New Jersey
environment. So seldom do I have the
opportunity to fly an airplane from my home
base that it was amusing to find it was
owned by a good friend, Vern Lewis. In
answer to my questions he said, "Let's go
flying." (He freely admits you don't have to
twist his arm too hard to get him into the
air.)
Vernon had virtually no
formal tailwheel time when he bought the
airplane so I watched with great interest as
he rounded the corner onto final to our
2000-foot strip at Aeroflex-Andover and
proceeded to make one of the prettiest
three-pointers I've ever seen. I walked over
to the airplane and looked at it as if I
were seeing one for the first time, in an
effort to weed out those things which set it
apart from its modern day cousin that the
prospective buyer might be interested in
knowing. One of the first items I noticed in
boarding the airplane was the step is well
located for getting into the front seat but
boarding into the back without that tricycle
gear is a little more difficult. However,
once in the back seat I found it to be quite
commodious with much more leg room than I
had imagined. The same is true of the front.
As far as leg room and room in which to
slide your buns around, you couldn't ask for
more.
When I scrambled up into
the front seat, I was more than surprised by
the visibility over the nose . . and I do
mean visibility over the nose. Since
virtually all my current flying is done in
taildraggers I have become used to equating
having the nose wheel mounted on the tail
with not being able to see straight ahead.
Not so, in the 170. In actuality there's
little difference between the visibility in
a 170 versus that of a 172. Once you can see
the runway, how much more do you need to
see?
I was certain, however, I
was going to have a hell of a time getting
my references up. With so little airplane in
front of me, I wasn't sure I'd know the
three-point attitude when I saw it and I'd
tend to over-rotate on landing and snag the
tail wheel first.
As I slid the
seat forward, I felt the seat pins lock into
position but did the old "Cessna Shuffle"
(where I rocked fore and aft in the seat) to
make, sure it was indeed locked. More than
one Cessna pilot has found his seat unlocked
and sliding towards the rear during takeoff
. . . something which gets your attention!
When I went to fire up
the Continental it was easy to see I was out
of my element since I pushed the mixture in
and immediately reached over and pulled the
starter handle. The little Continental
cranked over half a dozen blades and then
Vern reached over and turned on the mags.
All right, so I wasn't an expert yet!
Taxiing was pretty much
as i had expected since you can see clearly
over the nose and directional control is no
problem. I was surprised to find the
tailwheel steering very much on the sedate
side and required a punch of the brake now
and then to tighten up a turn. As I was to
learn later the sedate personality shown in
taxiing applies to everything throughout the
entire airplane. Intended to be flown by the
weakest link in the pilot chain, any type of
"quick" handling-either in the air or on the
ground-was designed out.
I ran a mag check at 1700
rpm and got my first dose of the Continental
cacophony. I had been told that 170s almost
always need a certain amount of
soundproofing and this was the first
indication the legend was true.
The handbook said to make
takeoffs clean unless you are on a short
field and then you use one notch of flaps.
So I ignored the flap handle, cleared for
traffic, rolled into the centreline and
shoved the power up to the stop. The
airplane responded exactly like a Cessna,
with no significant surprises in the way it
accelerated.
After rolling a distance,
I shoved the wheel forward to hoist the tail
at which point Vernon said, "Higher, get the
tail higher." Since I already felt as if I
was about to dig a hole in the pavement with
the prop, I didn't respond. But I should
have. It turns out the higher you get the
tail and the closer to level attitude you
are, the more you load that spring gear and
the steadier it becomes on takeoff. Since I
was a little tail down, the airplane got
light on its gear before it was ready to fly
and I had a little trouble keeping the
centre line centred . . . in fact, I
wandered off quite a bit. I could see where
it would take a little time to get smooth
takeoffs.
Vernon said to go for 85
mph for the climb, so as soon as the
airplane lifted off the ground I poked the
nose down trying to get 85 mph. I was
surprised to see how long it took for that
number to show up on the gauge. Once the
needle worked its way around to the
appropriate number, I gingerly brought the
nose up to establish what appeared to be a
climb attitude that would maintain 85 mph.
Because you sit so high above the nose, it's
difficult to believe you're in any kind of a
climbing attitude because you appear to be
almost dead level. Without putting a stop
watch on it, it would appear that the VSI
was about right, and 500 feet-per-minute was
all we were going to see. At that point I
asked Vern the critical question and he
nodded his head saying yes, it did indeed
have a cruise prop on it. We were a long way
from gross and even though it was warm
outside, it was obvious that in no case was
this thing going to be a real barn burner in
the climb department.
As we made it up to
altitude, the visibility became one of the
airplane's real strong points. You were
never blind in any situation. However, out
and out speed was not one of its strong
points. At 2450 rpm and 2500 feet we were
only indicating about 110 mph. I wanted to
see how close the airplane came to the
original advertised speed of 120 mph, so I
pointed my nose north toward the closest
local airport and carefully ran a two-way
speed check at 2500 feet AGL. Doing my best
to hold heading and altitude, I took time
hacks over the centre of both airports and
was surprised when my trusty little computer
showed me a two-way average of 119 mph,
which is about as close as you're going to
get to 120 without lying.
In talking, no,
make that shouting to Vernon during the
speed test it became readily apparent the
soundproofing many owners have put in the
170 is well worth the extra weight. The six
cylinder engine is smooth as glass but noisy
as hell, and anything that can be done to
quiet the cabin would be well worth the time
and effort.
Except for the noise, I
found our short cross-country to be
extremely comfortable due primarily to the
seating and general room the 170 offered.
Since N1956C was a little ragged around the
edges, you'd be hard pressed to say that it
was luxurious. But, you would be even more
hard pressed to say it was anything but
comfortable, which, when coupled with the
airplane's natural stability, makes it into
a fine cross-country ship.
If there's one thing,
which varies on 170s, besides the paint
jobs, it's the instrument panels. Because
the panel is so close to being the same size
as the 172, i.e. it has plenty of room for
radios, you find many of these airplanes
modified with some of the very latest in
get-me-where-I'm-going radio gear. And then
you find a lot of them like 1956C; still
carrying some of its original radio
equipment, which is, combined with some of
the later King series. In this case, we have
an old Narco coffee grinder Superhomer and
in the other corner a late slim line pack
... only part of which worked.
Once we had decided how
fast the airplane went, it was time to find
out how slow it went and what the stall was
like. Carb heat out, power back, I brought
the nose up to the horizon and kept pulling
as it tried to fail. The speed came down to
around 50 mph quite rapidly and I found the
column right up against the stop before the
airplane shuddered just a little and rolled
very gently to the left. I repeated the
performance several times to make sure I did
have the ball centred and the roll wasn't
induced by my size 10 Justins. The stall did
have a very, very slight edge, but was
mostly mush which turned into solid flight
the second you released back pressure and
added some power. When I ran the flaps out,
the only thing that changed was the numbers
got smaller and, oddly enough, the departure
was not quite as noticeable.
The characteristic most
noticeable during the stalls was how low the
nose was in relationship to the horizon. It
would be quite easy to accidentally get your
attitude too high and burn off critical
miles per hour during approach. This is
especially true with flaps out.
The "B" model C-170s have
a full 40 degrees (actually 38 to be exact)
of flaps. And, as you get down to the last
two notches, those big Fowlers slide out
(straight 170 and 170A's have simple hinged
flaps) and you find the Cessna has become a
real parachute. However, bring the power
back and let the nose come up just a few
degrees and airspeed goes to hell in a hand
basket.
As I headed back into the
pattern, I once again found myself having my
usual Cessna syndrome problem . . . not
being used to an airplane that glides and
having trouble getting them down from
altitude. With the 170, even nose down and
power back, I found myself catching thermals
that were perfectly willing to let me stay
up there for nothing.
As I headed downwind, I
reminded myself how well the airplane glided
and moved base leg out far enough to give
room to play. I brought flap handle up one
notch just before turning final and one more
notch as I settled onto final. One thing
about early Cessna flaps, there's absolutely
no doubt when you're putting them out
because the flap handle is the size of a
broom stick and, when you have full flaps
out, the handle sticks up between the seats
and actually gets in the way of your elbow.
Vernon advised to hang
onto 70 mph on final, bleeding that down to
65 mph and then 60 mph over the fence, which
is exactly what I did. We had a fairly calm
day going but the thermals off the lake gave
a little shot now and then and I found the
old 170 needed a fair amount of aileron to
keep things copasetic. I could see where
really heavy turbulence would work your butt
off and you'd be going stop to stop. The
cockpit would fill up with flying elbows in
a hurry.
There was a
slight crosswind from the right and I let
the airplane crab into it until I got fairly
close to the runway. Then, just as I began
to cross-control to get rid of the crosswind
component, it disappeared All this time I
was reminding myself to keep the nose down
because the speed was falling through 60 mph
faster than desired.
I leveled off at what
looked like the right height and found that,
once again, I was wrong. Holding off, trying
hard to visualize the exact nose attitude
which would put all three on the ground at
the same time, I kept the wheel coming back
and listened to the stall warning horn
chirping away. Since the speed decayed a
little too far, it didn't take long for the
airplane to quit flying and drop the
remaining few inches with a rather
resounding thud. The spring gear soaked up
the shock and did not throw us back into the
air which it had every right to do.
I had hit on all three
and was straight, so the airplane had no
tendency to go darting off through the
runway lights. I was fixated on the runway
ahead to make certain the airplane didn't do
any unscheduled sashaying. Both feet were
ready to stomp on rudder and/or brake in
case anything appeared to be going awry.
My feet got really bored,
really fast. It wasn't until we were down to
around 30 mph that rudder became necessary
and then it was primarily to get on the
brakes to slow down.
I was a little surprised
at how the Cessna 170 flew, but I shouldn't
have been. I have to keep reminding myself
this airplane was designed in 1947, when
T-Crafts and Cubs were the standards and
everything else worked up from there. I
guess maybe it's been a little too long
since I've flown such airplanes. I've
forgotten how low wing loading, high power
loading airplanes fly. That's not to say
they fly badly, but they do fly differently
from the birds I've been bashing around most
recently.
I was also surprised at
how easy the airplane was to handle on the
ground. The airplane had a slight "waddle"
when running on its mains similar to an
L-19, but that should be expected.
Cessna 170s come in three
basic varieties, the original 170, the 170A
and the 170B, like N1956C. The straight
170's are really nothing more than scaled up
Cessna 140s. From a distance you would have
trouble telling them apart. They have the
same tails and fabric covered wings.
Somewhere around 700 of the original models
were built before they changed over to the
all-metal 170As, with the totally new tail
surfaces we tend to associate with L-19s and
C-195s. Both airplanes use the Continental
six banger with 145 ponies. It has been said
this engine doesn't like 100LL at all, since
it was designed to drink nothing but 80
octane. The "B" models introduced the Fowler
flaps.
What do you look for when
buying a 170? The normal stuff, i.e. damage
or log book entries that indicate ground
loops, corrosion in control surfaces and
around the tail cone and a weary engine.
Getting an airplane with a decent engine
today, whether it is a 170 or any other used
bird, is an absolute must. Since the price
of overhauling engines has gotten so
astronomical, you can very easily find
yourself with an airplane in which the price
of overhauling the engine is higher than the
total value of the machine.
With the price spread of
170s being what it is, it makes sense to go
out and buy the absolute best one you can
lay your hands on one which someone else has
already invested the time and money to
paint, upholster and set up with new
avionics and an overhauled engine. An
airplane like that should come in at around
$15,000-$16,000 or maybe a couple thousand
more if it's a real showpiece. Even at that
price it's a hell of a lot cheaper than
buying a bargain basement 170 and then using
your own elbow grease to bring it up to
snuff. If you want an airplane to restore
that's fine, but you're not going to come
out with a cheap airplane. What you will
have is an airplane that is totally yours
and reflects your own taste but it's still
going to cost more than those being sold at
the top of the market.
If there were one
modification I would make to the airplane it
would be more horsepower. I have never had a
chance to sit behind one of the 180 horse
Lycoming conversions with the constant
speed, prop, but I have to believe it would
make the 170 a whole lot peppier. If you're
going to do that, maybe you ought to look at
a Cessna 180 in the first place. But that's
a different story.