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In 1978, T. A. Heppenheimer analyzed Bussard's original suggestion of fusing protons, but found the Bremsstrahlung losses from compressing protons to fusion densities was greater than the power that could be produced by a factor of about 1 billion, thus indicating that the proposed version of the Bussard ramjet was infeasible.^[2] However, Daniel P. Whitmire's 1975 analysis^[3] indicates that a ramjet may achieve net power via the CNO cycle, which produces fusion at a much higher rate (~10¹⁶ times higher) than the proton–proton chain.^{[citation needed]}