Blohm & Voss BV 141B-0

I believe that until an upload is approved, only the author can see it.
Here is the link that I received this morning:

http://www.sim-outhouse.com/sohforums/local_links.php?catid=19&linkid=23104

The basic research needed to rework this project actually taught me quite a lot about how things can be made to work.
This was a great illustration of how a rotating propeller creates a bias and how an asymmetrical design can have better handling characteristics than a symmetrical design.

In flight tests, the actual aircraft had a tendency to pull to the right which indicates that the thrust line was offset more than needed.
Perhaps this was in anticipation of greater power and torque with updated engines which unfortunately never happened.

- Ivan.
 
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OK!
I had always wondered what effect the period of approval had...
Interesting how this assymmetry can compensate the usual left yearning.
Cheers,
Aleatorylamp
 
Hello Aleatorylamp,

Aleatorylamp said:
I´m looking forward to trying out the .air file. Perhaps I can learn something
from it from my own planes, especially regarding adjustments for level trimming
without autopilot. I have always had difficulty with that.
Click to expand...

Back in August, you asked about setting trim and I told you there wasn't anything special in this AIR file.
I don't know if you have downloaded the BV 141B or had a chance to poke around at the AIR file, but I you have:
Did you find anything of use to you or find anything contradictory in the flight model compared to the Checklist?

- Ivan.
 
Hello Ivan,
I´ve been quite engrossed in straightening cooling vanes sand fitting pushrods on a radial engine.

Nevertheless, I have had time to enjoy the rather unexpected and stable flying characteristics of your BV141B. There´s tremendous power in that twin-row radial engine - it climbs strongly and steadily!

The Checklist states the right tendency during the take-off run, which coincides with the model´s behaviour, and I didn´t really notice anything contradictory. I didn´t fiddle around with the tanks though.

I also had a look into the .air file, and noticed how the slight left offset of the engine placing effectively counteracts the left yearning that would usually occur because of torque.

I noticed some differences in some of the Yaw Moment and Side Force parameters at the bottom of the Primary Aerodynamics list, but to analyse those is rather out of my scope. I sometimes manage to get desired stability or instability effects with them, but it´s difficult to explain exactly what happens.

Then, I saw that there were several other .air files with a higher powered engine, which presumably were only provisional ones, perhaps for trials. Another thing I noticed was that the panel is for full screen mode only, and that the small auxiliary panel won´t show. Perhaps it has to do with my graphics card... which for example won´t allow hardware accelleration in FS98!

Anyway, it´s a very interesting assymmetrical plane!
Cheers,
Aleatorylamp
 
Hello Aleatorylamp,

I had intentionally left in all of the versions of the AIR files from the beginning so that you could see the progression and what exactly was modified at each step. There are two description records. One is shown in CFS. I believe the other shows in FS98, but since I do not intend the download for FS98, I use that record to note version changes.
Id you order the files by version number and date, things should be pretty clear.

This AIR file probably started off as a direct copy of the stock FW190A, so there may be some differences from the P51D I normally use, so perhaps that is why some fields are a bit different from what you expect.
I skipped a lot of general handling tests for this release so hopefully nothing serious was missed.

I know about the display only in Full Screen. It was a choice as was the restriction on resizing the auxiliary panel.
I am somewhat surprised that the panel does not display on your machine. I did test it on a second machine here but it was a Windows 2000 box. I guess I should try to get a couple more CFS machines operational again to see if this download displays properly on those.

Stability is actually pretty low longitudinally but that was actually intentional.

My guess now is that if propeller diameter were not an issue, the crew compartment would have had less of an offset and perhaps that is why instead of neutral directional trim, it pulls to the right.

- Ivan.
 
Hello Ivan,
Now I´ve finished done the Stearmans, I have a bit more time to
look into the extra "progress version" .air files you supplied with
your BV-141B, and investigate a bit there!
Cheers,
Aleatorylamp
 
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