Most IC powered SLGs can get up to 2000' for about 2 litres of fuel. Most modern ones have a climd of 800 fpm or thereabouts at <50kts with a steep climb angle. And although there are millions of moving parts in the engine. they're all the type of part that a chap with a lathe in the back room can turn up in an hour or so. You can't say that about the jets, whatever their advantages.
Far out!!! On 31 May 2010 13:54, DMcD <slutsw...@gmail.com> wrote: > Unless I am mistaken, which I usually am, the problem is similar to > that of things like the Quickie... > > You get a high speed take-off and although you get a reasonably rate > of climb in fps, you also get a very shallow angle, so things like > trees at the end of the strip become much more of a problem than they > would with a slower moving aircraft which has a steeper climb angle. > > I do wonder sometimes if we are not like natives being bought off with > beads and mirrors. Internal combustion engines, like democracy, are > pretty awful things, but until something better turns up..... > > Most IC powered SLGs can get up to 2000' for about 2 litres of fuel. > Most modern ones have a climd of 800 fpm or thereabouts at <50kts with > a steep climb angle. And although there are millions of moving parts > in the engine. they're all the type of part that a chap with a lathe > in the back room can turn up in an hour or so. You can't say that > about the jets, whatever their advantages. > > D > > > > On 31/05/2010, Mike Borgelt <mborg...@borgeltinstruments.com> wrote: >> At 11:46 PM 30/05/2010, you wrote: >>>pretty long take-off run; high density altitude? >>>PeterS >> >> No different from a prop which also loses thrust at high density altitude. >> An initial slow but constant acceleration doesn't actually increase >> the length of the takeoff roll compared to a higher initial >> accleration which decreases as you go faster. You are covering lots >> of ground while going faster so that's where you want the higher >> relative acceleration. For a 400Kg glider with TOP (75Kg initial >> thrust) vs a 400 Kg glider with 68 Kg jets the thrust crossover is at >> about 10 knots. With 56Kg thrust it is at around 21 knots. >> >> Mike >> Borgelt Instruments - manufacturers of quality soaring instruments since >> 1978 >> phone Int'l + 61 746 355784 >> fax Int'l + 61 746 358796 >> cellphone Int'l + 61 428 355784 >> >> email: mborg...@borgeltinstruments.com >> website: www.borgeltinstruments.com >> >> _______________________________________________ >> Aus-soaring mailing list >> Aus-soaring@lists.internode.on.net >> To check or change subscription details, visit: >> http://lists.internode.on.net/mailman/listinfo/aus-soaring >> > _______________________________________________ > Aus-soaring mailing list > Aus-soaring@lists.internode.on.net > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring > _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
