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- Path: sparky!uunet!rde!gator!inland!bloom
- From: bloom@inland.com
- Newsgroups: rec.models.rc
- Subject: Re: FAQ? (questions about engines)
- Message-ID: <1992Sep10.080417.2292@inland.com>
- Date: 10 Sep 92 08:04:17 CST
- References: <1992Aug27.083734.2254@inland.com> <1992Sep4.160330.21836@dcdwest.uucp> <1992Sep8.084215.2281@inland.com> <1992Sep9.142737.9933@ryn.mro4.dec.com>
- Organization: Inland Steel Company; East Chicago, IN
- Lines: 25
-
- In article <1992Sep9.142737.9933@ryn.mro4.dec.com>, barber@ad.enet.dec.com (ANDREW BARBER) writes:
- >
- > Yes, I know an ideal engine is impossible (i didn't say it was)...I just cited
- > it as an extreme case to demonstrate my point about waste heat. I think nitro
- > has more energy per volume than the rest of the fuel. In this manner, you are
- > going to get more energy out of every stroke. This energy will be split
- > bewteen excess heat (waste) and mechanical energy. The ratio depends on how
- > the nitro burns. I think nitro also burns faster (higher power per volume).
- >
- >
- > andy
-
-
- Actually nitromethane has less energy per volume than either methanol or
- gasoline, but the stoichiometric ratio of nitromethane to oxygen is
- larger than the ratio for the other fuels. This means that you burn a
- much greater volume of nitromethane per each stroke of your piston, and
- subsequently produce more heat and more power. In addition, nitromethane
- by itself is a slower burning fuel than methanol and requires more
- ignition advance to utilize its chemical energy efficiently. Since
- model engines do not have an easy way to change the ignition point using
- a glow plug, high nitro fuels use a lot more propylene oxide to speed
- up the burn rate of the fuel. As an example, an extremely potent racing
- fuel might contain 70% nitro, 10% propylene oxide and 20% oil and no
- methanol.
-