The KR-34C with 165 hp Wright J-6-5 five-cylinder radial. John Reid's N831N is seen in 1963 with the fuselage locker door open, ailerons on the lower wing only, and divided undercarriage.

Самолёты на фотографии: Aircrafts on the photo: Kreider-Reisner C-4 / C-6 Challenger - СШАUSA - 1928

The Parks P-2 with 115 hp Axelson seven-cylinder radial. It was identical to the KR-34 and was built by Ryan as the P-2 Speedster.

Самолёты на фотографии: Aircrafts on the photo: Parks P-2 - СШАUSA - 1929

The Ryan P-2A Speedster with 165 hp Wright J-6-5 five-cylinder radial, equivalent to the Parks P-2A and KR-34C.

Самолёты на фотографии: Aircrafts on the photo: Parks P-2 - СШАUSA - 1929

Parks P-1H NC13533 has Hammond features such as the new fin and rudder and long undercarriage shock-absorber legs. The spats and Townend ring on the Kinner engine were not adopted for the Hammond 100.

Самолёты на фотографии: Aircrafts on the photo: Parks P-2 - СШАUSA - 1929

Another fin and rudder assembly tried on the P-1H was the long oval shape with increased fin area seen on NC756Y. It has ailerons on the lower wing only so perhaps it should have been called a P-2H ?

Самолёты на фотографии: Aircrafts on the photo: Parks P-2 - СШАUSA - 1929

RYAN SPEEDSTER P-2 (115 hp Axelson)

Самолёты на фотографии: Aircrafts on the photo: Parks P-2 - СШАUSA - 1929

The Fairchild KR-31 with 90 hp Curtiss OX-5 engine and radiator mounted above. N838E was photographed in 1961 when owned by John Marshall.

Самолёты на фотографии: Aircrafts on the photo: Kreider-Reisner C-2 Challenger - СШАUSA - 1928

The Parks P-1, identical to the KR-31 except for the underside radiator. It retained the cross-axle undercarriage and ailerons on upper and lower wings connected by link struts.

Самолёты на фотографии: Aircrafts on the photo: Kreider-Reisner C-2 Challenger - СШАUSA - 1928

Kreider-Reisner KR-31 NC5796 of 1927 with Curtiss OX-5 V-8 engine being flown 30 years later by Ernest Buehl, operator of the Flying Dutchman Air Service of Pennsylvania.

Самолёты на фотографии: Aircrafts on the photo: Kreider-Reisner C-2 Challenger - СШАUSA - 1928