Re: [Flightgear-devel] Stabilizer Trim
Innis Cunningham wrote: Hi All As far as I can tell there is no property to simulate a stabilizer trim system in flightgear.If this is not the case then maybe some kind soul could point me to the said property. If there is infact no such property currently, is there some kind soul who could impliment it in flightgear. As this is quite a common system on large and not so large commercial aircraft I would think that it should be an integerial property of flightgear. As I don't code I am hoping someone with coding abilities may be able to add it to the property tree. So far this has been done by adjusting the stabilizer property directly. Is that a problem? Erik ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Stabilizer Trim
Hi Eric Erik Hofman writes Innis Cunningham wrote: Hi All As far as I can tell there is no property to simulate a stabilizer trim system in flightgear.If this is not the case then maybe some kind soul could point me to the said property. If there is infact no such property currently, is there some kind soul who could impliment it in flightgear. As this is quite a common system on large and not so large commercial aircraft I would think that it should be an integerial property of flightgear. As I don't code I am hoping someone with coding abilities may be able to add it to the property tree. So far this has been done by adjusting the stabilizer property directly. I am sorry Erik but were will I find this property I have had a look in a few places in the property tree but can't seem to see any mention of stabilizer. Is that a problem? If it means continually accessing the property tree then I guess yes.It should be continually adjustable like elevator trim. Erik Cheers Innis _ Find love today with ninemsn personals. Click here: http://ninemsn.match.com?referrer=hotmailtagline ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Stabilizer Trim
As far as I can tell there is no property to simulate a stabilizer trim system in flightgear.If this is not the case then maybe some kind soul could point me to the said property. I think the last time this came up the consensus was that the current elevator-trim property could be used for stabilizer trim as well. Any aerodynamic differences (in JSBSim) can be handled with XML code, but the differences are so slight that nobody would notice anyway. The T38 model uses elevator-trim and elevator-cmd even though the real T-38 doesn't even *have* an elevator. Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Stabilizer Trim
Innis Cunningham wrote: As far as I can tell there is no property to simulate a stabilizer trim system in flightgear. If this is not the case then maybe some kind soul could point me to the said property. What's wrong with /controls/flight/elevator-trim? Stabilizer trim is an FDM implementation detail. The *control* which you modify in the property system isn't any different on a 747-400 than it is on a PA28-161. FWIW: You can map controls to the incidence value of an htsab object in YASim to make this work, although all the current aircraft simply add the elevator trim to the tail's flap deflection. The results are indistinguishable. Andy ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Stabilizer Trim
On Tuesday 27 July 2004 20:22, Andy Ross wrote: [snip] FWIW: You can map controls to the incidence value of an htsab object in YASim to make this work, although all the current aircraft simply add the elevator trim to the tail's flap deflection. The results are indistinguishable. Andy Reading that certainly made me stop and think:) I was under the impression that YASim had to set the hstab incidence and that this was one of the crucial aspects of the way YASim worked - reading that was a bit of a shock. I've used incidence in connection with wing and mstab entries but I wasn't aware that I could change this (starts thinking about LTV F-8s). What control-input control=X ID should be used? I notice you say an hstab object, but there can be only one hstab section, so did you mean vstab/mstab? Being able to vary wing, vstab and mstab incidence is interesting enough but there have been some fdms I've been working on where I'd like to have been able to try trading hstab deflection with incidence but thought it was intrinsically impossible. Could you knock up a few simple examples showing how to vary incidence? Not full fdms, or course, just the relevant control-input lines. LeeE ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Stabilizer Trim
Thanks Guys I guess the answer is there is no stabilizer trim property. Andy Ross writes Innis Cunningham wrote: As far as I can tell there is no property to simulate a stabilizer trim system in flightgear. If this is not the case then maybe some kind soul could point me to the said property. What's wrong with /controls/flight/elevator-trim? Because stab trim and elevator trim are not the same. It is like saying a piston engine and a jet engine are the same. They are in the fact that they both provide thrust to the aircraft.It is how they do it that is different. Stabilizer trim is an FDM implementation detail. The *control* which you modify in the property system isn't any different on a 747-400 than it is on a PA28-161. FWIW: You can map controls to the incidence value of an htsab object in YASim to make this work, although all the current aircraft simply add the elevator trim to the tail's flap deflection. The results are indistinguishable. Andy ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d _ Protect your inbox from harmful viruses with new ninemsn Premium. Go to http://ninemsn.com.au/premium/landing.asp?banner=emailtagreferrer=hotmail ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Stabilizer Trim
On Tue, 2004-07-27 at 18:36, Innis Cunningham wrote: Thanks Guys I guess the answer is there is no stabilizer trim property. Andy Ross writes Innis Cunningham wrote: As far as I can tell there is no property to simulate a stabilizer trim system in flightgear. If this is not the case then maybe some kind soul could point me to the said property. What's wrong with /controls/flight/elevator-trim? Because stab trim and elevator trim are not the same. It is like saying a piston engine and a jet engine are the same. They are in the fact that they both provide thrust to the aircraft.It is how they do it that is different. No they are not, but they accomplish the same thing *and* the great majority of aircraft have one or the other but not both. So having one property to represent the function is fine. Maybe name it pitch-trim? Stabilizer trim is an FDM implementation detail. The *control* which you modify in the property system isn't any different on a 747-400 than it is on a PA28-161. FWIW: You can map controls to the incidence value of an htsab object in YASim to make this work, although all the current aircraft simply add the elevator trim to the tail's flap deflection. The results are indistinguishable. Andy ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d _ Protect your inbox from harmful viruses with new ninemsn Premium. Go to http://ninemsn.com.au/premium/landing.asp?banner=emailtagreferrer=hotmail ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d -- Tony Peden [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Stabilizer Trim
Innis Cunningham wrote: Andy Ross wrote: What's wrong with /controls/flight/elevator-trim? Because stab trim and elevator trim are not the same. It is like saying a piston engine and a jet engine are the same. They are in the fact that they both provide thrust to the aircraft.It is how they do it that is different. But this logic and your example would therefore argue for separate *throttle* properties for jets and piston engines. :) The elevator-trim property is a control. It represents a lever (or wheel, or rocker switch...) that the pilot uses to change the trim properties of the aircraft. It really doesn't have anything to do with the physical properties of the aircraft. So I'll ask again: what is it you want to do that cannot be done with the existing control property? Andy ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Stabilizer Trim
Andy Ross writes So I'll ask again: what is it you want to do that cannot be done with the existing control property? I guess that the current elevator trim property does trim the aircraft in pitch. But if the stabilizer trim and the elevator trim use the same property then applying trim will cause the elevator and the stabilizer to both move and the elevator normally remains faired with the stabilizer during stab triming. This is no problem I was just asking incase there was an existing property that I could not find.But for larger commercial aircraft modelling it would be nice to have an independant property. Andy Cheers Innis _ SEEK: Now with over 50,000 dream jobs! Click here: http://ninemsn.seek.com.au?hotmail ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
[Flightgear-devel] Stabilizer Trim
Hi All As far as I can tell there is no property to simulate a stabilizer trim system in flightgear.If this is not the case then maybe some kind soul could point me to the said property. If there is infact no such property currently, is there some kind soul who could impliment it in flightgear. As this is quite a common system on large and not so large commercial aircraft I would think that it should be an integerial property of flightgear. As I don't code I am hoping someone with coding abilities may be able to add it to the property tree. Thanks in advance Cheers Innis _ Play Love Hunt to win a $9000 holiday and find love! http://mobilecentral.ninemsn.com.au/mclovehunt/lovehunt.aspx ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
