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- Newsgroups: rec.games.mecha
- Path: sparky!uunet!gatech!concert!samba!gibbs.oit.unc.edu!moore
- From: moore@gibbs.oit.unc.edu (Hall Moore)
- Subject: Re: [Btech] Engines....Hmmmm.
- Message-ID: <1993Jan25.165359.11256@samba.oit.unc.edu>
- Sender: usenet@samba.oit.unc.edu
- Nntp-Posting-Host: gibbs.oit.unc.edu
- Organization: University of North Carolina at Chapel Hill
- References: <1993Jan22.130415.5170@wkuvx1.bitnet>
- Date: Mon, 25 Jan 1993 16:53:59 GMT
- Lines: 54
-
- In article <1993Jan22.130415.5170@wkuvx1.bitnet> fannicm@wkuvx1.bitnet (Master Hawk) writes:
- >
- > It is time to dust off my old complaints about BT and thereby be
- >accused of munchkinism (which I ignore at any rate so don't bother).
- >
- >Engines
- > The non-linear system used by the BT publishers to determine engine rate
- >for each size strikes me as odd. For example, a 10 rated engine weighs .5
- >tons; a 20 rated is either .5 or 1.0 (I do not have me books with me, but I
- >believe it is .5). An engine of twice the power weighs just as much...why
- >use a 10 rated engine? (I know, I know. Who wants to use a 10 anyway...)
- > OK, no problem. Both engines are small and we can call it a rounding
- >problem (i.e. the 10 weighs .25 but quarter ton weights aren't supported,
-
- Stuff Deleted
-
- > So, any thoughts are appreciated.
- >
- >--Master Hawk--(
-
- This is by no means an explanation for WHY FASA did things this way, but
- there was a method to their madness. Here's how to discover it. Take some
- charting/graphing type package. Feed it the book list of engine ratings
- (ER) and tonnages (TON). Plot with X = ER and Y = ER/TON. Do a simple
- curve fit. (Due to the above noted rounding problems, this works best if
- you don't use any data for engines below about 250 ER). After a little
- manipulation of the above curve fit (which is a line with a coefficient of
- correlation ca. 0.9969 if I recall), you should get an equation similar to
- the following:
-
- TON = ER / (40.757 - (0.082803 * ER))
-
- Get a spread sheet to grind the crank on this, and round all
- calculated TONs to the nearest 0.5 tons (n.0 to n.24999 -> n.0; n.25 to
- n.74999 -> n.5; n.75 to n.99999 -> n+1). This gives the book value for
- all but five engines. The five discrepencies are as follows.
-
- ER Book TON Calc. TON Rounded TON
- 90 3 2.70 2.5
- 115 4 3.68 3.5
- 170 6 6.37 6.5
- 175 7 6.66 6.5
- 355 31.5 31.24 31
-
- As you can see, the equation never gives a rounded result which is
- more than 0.5 tons away from the book value. Again, I offer no
- rationalization for this, but the math works well.
-
- For the ultimate munchkin out there, plug 495 into the above equation.
- The non-XL 495 engine gives your 55 tonner a 9 walk and weighs -2147.5 tons.
- Think of the hell you can raise with that :)
- --
- * For purposes of complying with the New Jersey Right to Know Act,
- contents of this post partially unknown.
-