C+ compared to C++
S-76A+ 1S 10,500 or 10,800 depending on CSN kit
S-76A++ 1S1 same weight as above
S-76B PT6-36 11,700 about 102 built (Bs, Cs and C++ built on same production line until about 1999)
S-76C 1S1 11,700 about 40 built
S-76C+ 2S1 11,700, big delta is now single channel FADEC
S-76C++ 2S2 11,700 barrier filter dual channel FADEC
Zfw on a offshore C++ is about 7650, burns about 670lbs per hour slightly more than a C+. Cat A max gross right at ISA +20.
Here is the delta between C+ and C++, higher ratings are 2S2
OEI ratings:
30-second 1,0324.8%985
2-minute 9375.5%888
Continuous 8974.8%856
Dual engine ratings:
Takeoff9226.6%865
Continuous8335.0%793