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  2. Robinson R22 - Wikipedia

    en.wikipedia.org/wiki/Robinson_R22

    The R22 had 182 fatal accidents between March 1979 and June 2010 from a total of 1,230 incidents. In late 1981, the R22 had its type certificate temporarily revoked by the Federal Aviation Administration due to delamination of a main rotor blade.

  3. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    R-value is the temperature difference per unit of heat flux needed to sustain one unit of heat flux between the warmer surface and colder surface of a barrier under steady-state conditions. The measure is therefore equally relevant for lowering energy bills for heating in the winter, for cooling in the summer, and for general comfort.

  4. List of R-phrases - Wikipedia

    en.wikipedia.org/wiki/List_of_R-phrases

    R20 Harmful by inhalation R21 Harmful in contact with skin R22 Harmful if swallowed R23 Toxic by inhalation R24 Toxic in contact with skin R25 Toxic if swallowed R26 Very toxic by inhalation R27 Very toxic in contact with skin R28 Very toxic if swallowed R29 Contact with water liberates toxic gas. R30 Can become highly flammable in use R31

  5. Toyota R engine - Wikipedia

    en.wikipedia.org/wiki/Toyota_R_engine

    These changes also affected the 22R, therefore one can consider the 85–95 22R-E as a fuel injected version of the 85–90 22R with only minor differences, if any. Toyota swapped the dual-row timing chain used in older engines for a single-row chain with plastic guides in 1983.

  6. List of refrigerants - Wikipedia

    en.wikipedia.org/wiki/List_of_refrigerants

    According to ASHRAE standard 34, the R-number of a chemical refrigerant is assigned systematically according to its molecular structure and has between two and four digits. If there are carbon -carbon multiple bonds , there are four digits in all: the number of these bonds is the first digit and the number of carbon atoms minus one (C-1) is next.

  7. List of Lycoming O-360 variants - Wikipedia

    en.wikipedia.org/wiki/List_of_Lycoming_O-360...

    Robinson R22 Beta II with Lycoming O-360-J2A engine. O-360-J2A 145 hp (108 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as the C1C except has O-320-B2C prop flange bushings, lightweight cylinders and lower power rating for helicopter use. [1] [2] This engine is used in the Robinson R22 helicopter.

  8. List of New York City Subway R-type contracts - Wikipedia

    en.wikipedia.org/wiki/List_of_New_York_City...

    R20 Assorted work cars X100–X103 (tank cars), C214–C216 (crane cars), [8] D207–D210 (track ballast gondola cars), [9] F111–F141 (flat cars) [10] Magor Car Corporation: 1958 Retired, F116 preserved R21: Passenger cars 7050–7299 St. Louis Car 1956–1957 Retired, 7194/7203 preserved, 7121/7287 in work service R22: 7300–7749 1957–1958

  9. Atmel AVR instruction set - Wikipedia

    en.wikipedia.org/wiki/Atmel_AVR_instruction_set

    R20 R23 R22 R25 R24 R27 R26 X (pointer) R29 R28 Y (pointer) R31 R30 Z (pointer) Stack pointer SPH SPL Stack Pointer: Program counter: PC Program Counter: Extended memory RAMPD Extended direct RAMPX Extended X RAMPY Extended Y RAMPZ Extended Z EIND Extended indirect Status register I: T H: S: V: N: Z: C: SREG