Re: YASim Propeller rpm
Lee Elliott <[email protected]>
| Newsgroups | gmane.games.flightgear.flightmodel |
|---|---|
| Message-ID | <[email protected]> |
On Wednesday 20 April 2005 05:19, Peter Stickney wrote: > On Tuesday 19 April 2005 18:12, Lee Elliott wrote: > > On Wednesday 20 April 2005 04:56, Peter Stickney wrote: > > <snip - a bunche stuff on the NK-12> > > > > If I've been unclear, please feel free to ask me to try > > > again. I hope this helps. > > > > That's a terrific help - thanks very much. > > > > I probably will pester you again as I find other stuff I > > need to know :) > > Please feel free to ask anything. (Well, within reason, > anyway) If I can help, I'll be glad to. -- Pete Stickney Hello Pete, I started working through some of the numbers you gave but I can't see how the prop rpm you gave can be right:( The prop radius is around 3.2 m so the path of the prop tips per revolution is just over 20.1 m. At 850 rpm I figure that the tips will be moving at just under 285 m/s when the a/c is stationary. At a speed of 880 kph (475 kt/546 mph) the a/c is doing around 244 m/s. Combining the two gives me around 375 m/s, which is supersonic. This was what Jim pointed out earlier and I'm currently using a prop rpm value of 494. Could you check the prop rpm figure for me. Thanks, LeeE _______________________________________________ Flightgear-flightmodel mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-flightmodel 2f585eeea02e2c79d7b1d8c4963bae2d