Re: [Flightgear-devel] Problems with YASim turbine engines

2005-04-13 Thread Lee Elliott
On Wednesday 13 April 2005 20:44, Andy Ross wrote:
> Lee Elliott wrote:
> > I've got two flight models in development that use the YASim
> > turbine engine and [...] the fuel flow figures are of the
> > order of several hundred million gallons/hour.
>
> There was a units bug with the default (and currently
> untunable) BSFC number.  Try it now and see if that makes more
> sense.
>
> Andy

Thanks - that seems to have done the trick.

LeeE

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Re: [Flightgear-devel] Problems with YASim turbine engines

2005-04-13 Thread Arnt Karlsen
On Wed, 13 Apr 2005 14:07:23 -0700, Andy wrote in message 
<[EMAIL PROTECTED]>:

> Arnt Karlsen wrote:
> > Andy Ross wrote:
> > > There was a units bug with the default (and currently untunable)
> > > BSFC number.
> >
> > ..could the BSFC figure be moved to the config tree?  (Would allow
> > modelling exotic fuels etc too.)
> 
> I lied.  You actually *can* set the fuel consumption on the turbine
> engine with a "bsfc" attribute.  Sorry. :)

.. ;o)

-- 
..med vennlig hilsen = with Kind Regards from Arnt... ;o)
...with a number of polar bear hunters in his ancestry...
  Scenarios always come in sets of three: 
  best case, worst case, and just in case.



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Re: [Flightgear-devel] Problems with YASim turbine engines

2005-04-13 Thread Andy Ross
Arnt Karlsen wrote:
> Andy Ross wrote:
> > There was a units bug with the default (and currently untunable) BSFC
> > number.
>
> ..could the BSFC figure be moved to the config tree?  (Would allow
> modelling exotic fuels etc too.)

I lied.  You actually *can* set the fuel consumption on the turbine
engine with a "bsfc" attribute.  Sorry. :)

Andy

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Re: [Flightgear-devel] Problems with YASim turbine engines

2005-04-13 Thread Arnt Karlsen
On Wed, 13 Apr 2005 12:44:14 -0700, Andy wrote in message 
<[EMAIL PROTECTED]>:

> Lee Elliott wrote:
> > I've got two flight models in development that use the YASim turbine
> > engine and [...] the fuel flow figures are of the order of several
> > hundred million gallons/hour.
> 
> There was a units bug with the default (and currently untunable) BSFC
> number.  

..could the BSFC figure be moved to the config tree?  
(Would allow modelling exotic fuels etc too.)

-- 
..med vennlig hilsen = with Kind Regards from Arnt... ;o)
...with a number of polar bear hunters in his ancestry...
  Scenarios always come in sets of three: 
  best case, worst case, and just in case.


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Re: [Flightgear-devel] Problems with YASim turbine engines

2005-04-13 Thread Andy Ross
Lee Elliott wrote:
> I've got two flight models in development that use the YASim turbine
> engine and [...] the fuel flow figures are of the order of several
> hundred million gallons/hour.

There was a units bug with the default (and currently untunable) BSFC
number.  Try it now and see if that makes more sense.

Andy

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Re: [Flightgear-devel] Problems with YASim turbine engines

2005-04-13 Thread Lee Elliott
On Wednesday 13 April 2005 19:34, Lee Elliott wrote:
> Hello all,
[snip..]

also ignore the remark about the fuel tanks being empty on 
start-up - that only happens if your throttle is even only 
slightly open.

However, with the throttles fully closed I now notice that the 
fuel-flow rate is negative and is over-filling the tanks:)

Did I mention that I haven't done much propeller stuff?  :)

LeeE

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Re: [Flightgear-devel] Problems with YASim turbine engines

2005-04-13 Thread Lee Elliott
On Wednesday 13 April 2005 19:34, Lee Elliott wrote:
> Hello all,
>
> This is probably one for Andy R.
>
> I've got two flight models in development that use the YASim
> turbine engine and although they both solve and fly reasonably
> (bearing in mind that they are both pre-alpha and I've done
> less than 15 minutes on each) the fuel flow figures are of the
> order of several hundred million gallons/hour.  No - that's
> not a typo - several hundred millions of gallons per hour.
>
> Heh - although I said that they flew reasonably well for first
> attempts I should have added that this was with empty fuel
> tanks - as soon as the sim starts the tanks are drained:)
>
> There's a .tar.gz of the TU-114 YASim config on-line at
>
> http://www.overthetop.freeserve.co.uk/TU-114-yasim.tar.gz
>
> While there's certainly a lot of guesswork in the config I
> can't see, or even imagine, anything that would lead to these
> fuel-flow rates.
>
> The second 'problem' may not be a problem at all but just a
> mis-configuration in the same TU-114 config.  Although I've
> included contra="1" tags I still appear to be getting prop
> induced roll.
>
> I've also included moment tags but these are un-calculated
> place holder figures until I can work some proper numbers out
> but I thought that these were effectively ignored if
> contra="1" was included.
>
> LeeE

Oops - ignore the prop induced roll problem - the Right Outer 
engine needs a crucial '-' inserted in front of the propeller y 
loc - doh.

LeeE

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[Flightgear-devel] Problems with YASim turbine engines

2005-04-13 Thread Lee Elliott
Hello all,

This is probably one for Andy R.

I've got two flight models in development that use the YASim 
turbine engine and although they both solve and fly reasonably 
(bearing in mind that they are both pre-alpha and I've done less 
than 15 minutes on each) the fuel flow figures are of the order 
of several hundred million gallons/hour.  No - that's not a typo 
- several hundred millions of gallons per hour.

Heh - although I said that they flew reasonably well for first 
attempts I should have added that this was with empty fuel tanks 
- as soon as the sim starts the tanks are drained:)

There's a .tar.gz of the TU-114 YASim config on-line at

http://www.overthetop.freeserve.co.uk/TU-114-yasim.tar.gz

While there's certainly a lot of guesswork in the config I can't 
see, or even imagine, anything that would lead to these 
fuel-flow rates.

The second 'problem' may not be a problem at all but just a 
mis-configuration in the same TU-114 config.  Although I've 
included contra="1" tags I still appear to be getting prop 
induced roll.

I've also included moment tags but these are un-calculated place 
holder figures until I can work some proper numbers out but I 
thought that these were effectively ignored if contra="1" was 
included.

LeeE

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