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D4y

S

skylane

Charter Member
Hello!
I played around with Thicko´s very nice D4Y Suisei today and came across a few issues. One I was able to fix, the other two are beyond my capabilities.

First the easy one: In picture 1 you can see that the bombs appear on top of the wings. This is due to incorrect Hardpoints in the DP. They are, however, entered correctly in the D4Y3, so I copied this to the DPs in all the other models, and the problem was fixed.

Second, I discovered that wingmen and AI planes refuse to attack. They just fly around doing nothing.
Now Tango Romeo posted a possible solution to this problem some time ago: Just open the airfile with aired and in Record 1001, Inertia values, reduce the enterd numbers by half.
But in the airfiles for the Suiseis there is no record 1001. I´m not good enough with aired, so my question: Is it possible to add records to the airfile, and if yes, how?

Number three: After a bomb run, the big bomb carried in the fuselage appears to remain on the airplane. However, all three bombs do release. Pictures 2 and 3 capture the same instant. Viewed from above, you can see all three bombs. Viewed from below, you see the big one still seems to be on the airplane.
Although this is not a big issue for me, it made me curious and I´d like to know what causes this and if it can be changed.

Cheers

Wolfgang
 
Now, what I forgot to do on the first post: If anyone is interested in the hardpoint entries for the DPs, here they are. Just replace the entry in your DP with this,save and delete the -CDP file.

Hardpoints D4Y, all models:

[HARDPOINTS]
mount.0=-0.001,-0.44,0
mount.1=2.68,-0.53,-0.066
mount.2=-2.68,-0.53,-0.066
mount.3=2.68,-0.64,-0.18
mount.4=-2.68,-0.64,-0.18
mount.5=3,-0.53,-0.266
mount.6=-3,-0.53,-0.266
mount.7=3,-0.53,-0.266
mount.8=-3,-0.53,-0.266

Hardpoints D4Y2-S only:

[HARDPOINTS]
mount.0=-0.001,-0.44,0
mount.1=2.68,-0.53,-0.066
mount.2=-2.68,-0.53,-0.066
mount.3=2.68,-0.64,-0.18
mount.4=-2.68,-0.64,-0.18
mount.5=3,-0.53,-0.266
mount.6=-3,-0.53,-0.266
mount.7=3,-0.53,-0.266
mount.8=-3,-0.53,-0.266
mount.9=3,0,0
mount.10=-3,-0.39,-0.266
mount.11=-3.3,-0.36,-0.266
mount.12=-3,-0.39,-0.2663
mount.13=-3.3,-0.36,-0.266
mount.14=3,-0.39,-0.266
mount.15=3.3,-0.36,-0.266
mount.16=3,-0.39,-0.266
mount.17=3.3,-0.36,-0.266
 
Skylane
The center bomb in your pic is part of the plane and just for show and not part of the bomb loadout.As for AI attacking targets I've had no problems with that.It's been so long since I've had this plane I'm not sure if I had to make any fixes to it for AI's to attack.

Make sure category in DP is either 10(fighter bombers) or 3(dive bombers)


Talon
 
Hi Talon!

I have changed the category to 3 before I did those test missions, but that´s not the problem.
I now exchanged the airfile for the one from the old MDJudy available at Simviation, and with this the AI behave ok.

Cheers
 
Hi SL,
Ref. the airfile, yes it is possible (and easy!) to add entries to an airfile:-

1) Open AirEd and open the D4Y airfile (make a back-up copy for safe-keeps).

2) Open a second AirEd and open the donor ac's airfile with the 1001 entry.

3) Find the 1001 entry and and and right-mouse-click on it, the drop down choice box includes 'Copy to clipboard', click on that. This will copy the 1001 entry to the clipboard.

4) Return to the original opened D4Y airfile. Click/highlight any airfile entry in the list, right-mouse-click and from the drop down choice box choose 'Add from clipboard'. This will insert the 1001 entry in the correct numerical order.

5) If this contains the correct values, save as, if not change values and save as.

By opening two airfiles together you can see exactly what to choose and it's easier to see if there are any other entries you want.

Cheers Shessi
 
Unfortunately I didn´t save Tango Romeo´s thread I mentioned above - and now it´s gone.
If I remember correctly, the Ai´s characteristics are determined by the inertia values in the airfile, while the player aircraft is controlled by the config.
 
Here is the file from Tango Romeo,just right and open in new window or tab.If I was not allowed to repost this,just delete it and let me know.
 
So, I think this means that without a MOI entry in the airfile your Suiseis were using the ones in the .cfg file. Another option is to find an airfile tutorial (not sure where the one I have is at the moment) and use the planes actual dimensions (wingspan, length) to determine the proper MOIs. The formulas for doing so are quite easy and I have had very good results, even though I am a newby when it comes to modifying airfiles. Its a lot of fun to tinker with them to get what you want.
 
Here is an excerpt from Tom Goodrick's "Flight Dynamics for Microsoft Flight Simulator"

Dr Jan Roskam, has published an 8-volume set of texts on aircraft design. He has
taught courses in aircraft design for some time at the University of Kansas and has
developed a method for estimating MOI's that uses only basic aircraft weight and
dimensions combined with a set of coefficients of radii of gyration for several
specific aircraft. We simply determine which aircraft is similar to the design we
are concerned with, take the coefficients for each axis and the approriate
dimension and calculate MOI's. The formulae are:

Ix=(W/g)*(Rx*b/2)^2
Iy=(W/g)*(Ry*d/2)^2
Iz=(W/g)*(Rz*e/2)^2

where g=32.2 (gravity acceleration)
W=max takeoff weight (MTOW, lb)
b=span (feet)
d=length (feet)
e=(b+d)/2
and Rx, Ry and Rz are chosen from the table for the aircraft type. Some of Dr
Roskam’s dimensionless radii of gyration for several aircraft are given below (used
by permission). All are set at full fuel and MTOW.

Flight Dynamics by Tom Goodrick
Brought to you by Flight Simulator World and Abacus "We Fly The World"
34
AIRCRAFT ROLL Rx PITCH Ry YAW Rz
Low Wing Single (Beech N-35) .248 .338 .393
High Wing Single (Cessna 182RG) .242 .397 .393
Light Twin (Beech 55) .260 .329 .399
Medium Twin (Cessna 402) .373 .269 .461
Light Jet (Cessna 550 (Cit II)) .293 .312 .420
Medium Jet (Lockheed Jetstar) .370 .356 .503
Twin Turbo Prop (Fairchild F-27) .235 .363 .416
Four Eng T Prop (Electra) .394 .341 .497
Jet Airliner 4 eng (Convair 880) .322 .339 .464
Jet Airliner 3 aft eng (B 727-200) .248 .394 .502
Jet Airliner 2 eng wing (B737-200) .246 .382 .456
Jet Airliner 2 aft eng (DC-9-10) .242 .360 .435
Prop Airliner 4 eng (DC-6) .322 .324 .456
Prop Airliner 2 eng (Conv 340) .308 .345 .497
Jet Fighter (F-86) .266 .346 .400
Jet Fighter (F-104) .224 .392 .563
Jet Fighter (F-102) .295 .386 .520
Prop Fighter 1 eng (F4U Corsair) .268 .360 .420
Prop Fighter 1 eng (P47) .296 .322 .428
Prop Fighter 2 eng (Bristol Beauftr) .330 .299 .447
Prop Bomber 4 eng (B-29) .316 .320 .376
Prop Bomber 2 eng (Martin B-26) .270 .320 .410
Jet Bomber 4 eng (B-47) .346 .320 .474
Jet Bomber 8 eng (B-52) .346 .306 .466
Flying Wing (RB-49A) .316 .316 .510
These data were taken from Airplane Design Part V by Jan Roskam. ISBN 1-
884885-50-0 published by DARcorporation, Lawrence, Kansas, used by
permission.
 
Been away for a couple of days, and just now catching up...
That looks very interesting, erufle! Something more to try, once I find the time.
 
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