Wendy,
The S-1Cs are homebuilts and so they might have almost any engine on
them... but the original idea was for them to use the 85 hp Continental...
the 'C' was for Continental. In actual practice a LOT of these things had
125 hp Lycoming O-290Gs on them. The 'G' was for Ground Power Unit. There
were lots of these on the market, real cheap when that plan set was
released. They needed some crankshaft mods to work, and some guys sprung
for the aircraft crank, which held together much better than the modified
GPU crank. I've never seen a GPU crank on one myself... I'm pretty sure
they all got aircraft parts by now. Besides, the IAC won't allow the GPU
cranks in competition. But, remember, you could see almost any engine on
a -C, up to maybe a 200 hp Lycoming. BTW, most builders seem to have
lengthened these things a bit thru the cockpit area... they were just a bit
too tight for most folks.
The S-1S was the first type-certified Pitts. The 'S' was for symmetrical,
meaning it had symmetrical airfoils on the wings. Note that the wings had
symmetrical airfoils, but the ailerons did not have symmetrical sections...
they were the Friese type. It's fuselage was a bit longer, there are four
ailerons and the engine is the good ol' 180 hp Lycoming AEIO-360, with a
fixed metal propeller.
(a side note is in order here...The S-1E was the name the factory used on
its plans for the homebuilt -S. I believe the main difference between an -S
and an -E was the use of wood for the turtledeck and ailerons on the
homebuilt -E, metal on the factory airplanes. Of course, a homebuilder
could buy the metal parts and use them. The hangup here is, lots of those
planes that were built by homebuilders from the -E plans got registered with
the FAA as -Ss... confusing? A homebuilder can call his plane whatever he
likes, and there are a fair number of -Ss out there that are actually
homebuilts)
The S-1T was like an -S that had been lenghtened just a bit more, had
symmetrical ailerons and a 200 hp AEIO-360, with a Hartzell constant speed
propeller. The constant propeller was supposed to be used to meet noise
requirements for certification. If you're really looking at the
differences, the cabane structure was a bit different from the -S... the two
diagonals ran the other way. I think the rudder was a bit bigger.
Some folks still think the -S is the best single seat Pitts ever for it's
combination of simplicity, low weight and agility and relatively low cost.
Aviatt owns the Pitts and Husky lines these days. If I remember right,
Aerotek was the company that put the Pitts into production and did the parts
and tech support for the Pitts planes, until Frank Christen bought it.
Hmmm, that may be a bit garbled. Anybody smart on this?
I'm an old A & P that used to make my living wrenching on those funny
little dehydrated biplanes. I loved 'em and I still do.
I hope this helps, and I hope it's not too much more than you needed to
know.

Fight Gravity!

j.




"Wendy" wrote in message
...
Hi-

I've a few questions concerning S1 types. The -C I know has an AEIO-320,
with ailerons on the lower wing. The -S, I believe, has an AEIO-360 along
with four ailerons. Must it also have a constant speed prop to be a true
S1S? And how does the -S differ from the -T? Lastly, can anyone
enlighten
me on the differences, if any, between Aerotek and Aviat?

TIA-
Wendy