Re: [Flightgear-devel] Re: DC-3 model now animated
On Thu, 28 Feb 2002 13:33:52 -0500, David Megginson [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]: Tony Peden writes: All of my experience is with jets, what exactly are cowl flaps? They're flaps around the front of the nacelle -- when you open them, ...typically behind the engine itself... they produce extra drag (less than gear or flaps) and route more air over the engine for cooling; when you close them, you cut the drag but cut the cooling as well. Usually they're open for take off and landing and closed for cruise (since there's lots of air anyway). Some DC-3 pilots actually calculate the extra drag into their approaches. ..these cooling controls were also used in liquid cooled planes like the P38, P51, Me109, Spitfire, etc. ..some both air and liquid cooled planes use(d) shutters in front of the nacelle immediately behind the prop, FW190, and todays SU26 and the Round-Russian-Radial-engined Pitts (T2?) acrobats. -- ..med vennlig hilsen = with Kind Regards from Arnt... ;-) Scenarios always come in sets of three: best case, worst case, and just in case. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: DC-3 model now animated
- normalized position of ailerons - normalized position of flaps - normalized position of elevators - normalized position of rudder What about speed brakes/spoilers ? These are getting quite common on some of the faster planes like Mooney's... What about cowl flaps? JW ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: DC-3 model now animated
On Thu, 2002-02-28 at 08:19, John Wojnaroski wrote: - normalized position of ailerons - normalized position of flaps - normalized position of elevators - normalized position of rudder What about speed brakes/spoilers ? These are getting quite common on some of the faster planes like Mooney's... What about cowl flaps? All of my experience is with jets, what exactly are cowl flaps? JW ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel -- Tony Peden [EMAIL PROTECTED] We all know Linux is great ... it does infinite loops in 5 seconds. -- attributed to Linus Torvalds ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: DC-3 model now animated
What about cowl flaps? All of my experience is with jets, what exactly are cowl flaps? For aircooled engines, the flaps either constrain the airflow into the engine compartment, or constraint it coming out of the compartment. The C172RG has them underneath behind the gear. Flaps are open at slow speed and high power settings (eg climb) and are closed at high speed and low power (eg cruise). ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: DC-3 model now animated
Alex Perry writes: What about cowl flaps? All of my experience is with jets, what exactly are cowl flaps? For aircooled engines, the flaps either constrain the airflow into the engine compartment, or constraint it coming out of the compartment. The C172RG has them underneath behind the gear. Flaps are open at slow speed and high power settings (eg climb) and are closed at high speed and low power (eg cruise). Hmm, I suppose I really ought to take some consideration of this into the CHT model. Are these a manually operated thing? Cheers - Dave -- [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: DC-3 model now animated
Alex Perry writes: Hmm, I suppose I really ought to take some consideration of this into the CHT model. Are these a manually operated thing? It depends, of course. On the C172RG, it is a vertical moving lever just to the right of the elevator trim, with no automation. Newer aircraft designs often use motorized flaps, with a three position switch on the panel for open/close/auto. The latter monitors the oil temperature and opens/closes for you as the temperature moves. For the normal C172, there are no movable flaps and the modeling concern is irrelevant. For the ones we have in FGFS that _do_ have cowl flaps, I've got no idea. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
re: [Flightgear-devel] Re: DC-3 model now animated
Matthew Law writes: 3-D Model - - normalized position of ailerons - normalized position of flaps - normalized position of elevators - normalized position of rudder What about speed brakes/spoilers ? That's a good point, but I'm listing only what we're actually using today, not what we plan to use. Cowl flaps are important on the DC-3, for example, not only for cooling but for drag. All the best, David -- David Megginson [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: DC-3 model now animated
Tony Peden writes: All of my experience is with jets, what exactly are cowl flaps? They're flaps around the front of the nacelle -- when you open them, they produce extra drag (less than gear or flaps) and route more air over the engine for cooling; when you close them, you cut the drag but cut the cooling as well. Usually they're open for take off and landing and closed for cruise (since there's lots of air anyway). Some DC-3 pilots actually calculate the extra drag into their approaches. All the best, David -- David Megginson [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: DC-3 model now animated
What about cowl flaps? All of my experience is with jets, what exactly are cowl flaps? JW Mine too. Cowl flaps are used to cool engines for ground operations,taxi, takeoffs and landings when the engine is either at a high power setting or there is insufficient airfow to cool the engine. Located about (around) the engine compartment there are basically doors (vents) that are opened or closed (streamlined) with the surface. Open they cool the engine by allowing more air to flow thru and around the engine compartment, they also increase drag. JW ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Re: DC-3 model now animated
snip What about cowl flaps? snip And let's not forget the oil cooler doors on DC-6s etc :-) ! jj ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
