Re: YASim Propeller rpm
Jim Wilson <[email protected]>
| Newsgroups | gmane.games.flightgear.flightmodel |
|---|---|
| Message-ID | <[email protected]> |
> From: Lee Elliott > > Hello all, > > I'm trying to work out the right prop rpm figures for the TU-114 > - the airliner version of the TU-95 'Bear' - and I've arrived at > a figure of around 494 rpm for the cruise setting. I'm also > using a value of 958 for the takeoff-rpm, which I calculated at > 150 kts and 0 ft. > > This is based on 3.2m radius props and a cruise speed of 475 kts > at around 30000 ft. Off the top of my head...that'd be about 20m circumference, which at 1000rpm would be 20km per minute. Since an airliner does about 15km per minute. I think that'd be a bit over the speed of sound...depending on altitude. > Could someone check my maths and confirm that these figures are > about right i.e. the prop tips staying sub-sonic? > > While I can get the config to solve with these rpm values the > stand alone YASim solver seems to go into a loop if I include > the min-rpm & max-rpm tags. Is this likely to be due to me > trying to use impossible numbers in the config or is this a > problem within the solver? > Not sure. Just make sure if you are using a ratio that you scale everything that needs to be. _______________________________________________ Flightgear-flightmodel mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-flightmodel 2f585eeea02e2c79d7b1d8c4963bae2d