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Pilawt
They all derived from the original PA-28 Cherokee. In the early days they were barely distinguishable unless you opened the cowl.... trying to figure out why Piper named them all "Cherokee" when they're quite distinctively different aircraft, and mulling over which one is which...
The Cherokee 150 and 160 were first, in 1961. Actually the 150 was the first to fly, while the 160 was certified and marketed first. Today it would seem odd to market both a 150 and 160 simultaneously, but in the early '60s it made sense. The 160 had somewhat better performance and a higher gross weight, but the 150 could run on the cheaper 80 octane fuel. So they were both in the catalog through 1967.
Then at the end of 1962 the Cherokee 180 came out, identical to the others except for the engine and nameplate. A year later the Cherokee 235 appeared.
The same airframe -- N2800W -- served as the pre-production prototype for the 160, 180 and 235.
Reacting to competition from the Cessna 150 for the trainer market, Piper pulled the back seats, baggage compartment and baggage door out of the Cherokee 150, de-rated the engine to 140 hp at 2400 rpm, lowered the gross weight by 200 pounds, and the Cherokee 140 trainer was born. A year later the 140's horsepower rating and gross weight were increased to equal that of the Cherokee 150, and snap-in "2+2" back seats were offered as an option.
Then there were the Cherokee Six, Cherokee Arrow, Cherokee Warrior, and so on. They even flew a tri-motor Cherokee prototype. It seemed to be the ultimate mix'n'match design, and the family tree is confusing.
There will be a quiz.
Actually they did:Well... Not really. Remember, there's 145hp, 160hp, and 180hp versions of the 172 as well (though they never produced more than one of them at the factory at any given time)
1963: 172D (145 hp) and P172D Powermatic (175 hp, carryover of the earlier Model 175);
1983-85: 172P (160 hp) and 172Q Cutlass (180 hp, fixed gear);
1999-present: 172R (160 hp) and 172S (180 hp).
The 210 hp R172 was the military T-41B and was also manufactured in France and sold on the European civilian market as "Reims Rocket" beginning in 1968. When the Cardinal was on its way out the R172 was "Americanized" to replace it and introduced here as the R172K "Hawk XP" (1977-81). In deference to sensitive American ears the 210 hp (at 2800 rpm) IO-360 was de-rated to 195 hp. There is an STC available to restore it to 210 hp.and the 172XP (195hp, c/s prop). Some of the XP's also had 210hp engines.
"Arrow I" (though the factory never called it that) was originally 180 hp, and a 200 hp option was added in 1969. The two were produced together until the 180 hp version was quietly dropped in 1971. The "Cherokee Arrow II" (1972-1976) had 200 hp, stretch cabin, and longer wings and stabilator.Hell, the variants of Arrows are pretty easy to tell apart except the I and II (which only differed in engine hp)