General Category > Unofficial F/A-18 Acceleration Pack board
vLSO Beta release
predattak:
Thank you for your help guys, this is nice info but i'm still not sure about what variables to put into vLSO ... it's asking me for a slow and fast AoA these charts are telling me that the optimum angle is 17 points of AoA so what number should i put in the fast and slow box so that vLSO can calculate that 17 points of AoA is the good angle? ..maybe i got the charts wrong if so sorry about that guys
ESzczesniak:
--- Quote from: predattak on December 15, 2014, 10:54:05 am ---Thank you for your help guys, this is nice info but i'm still not sure about what variables to put into vLSO ... it's asking me for a slow and fast AoA these charts are telling me that the optimum angle is 17 points of AoA so what number should i put in the fast and slow box so that vLSO can calculate that 17 points of AoA is the good angle? ..maybe i got the charts wrong if so sorry about that guys
--- End quote ---
Hopefully others can point to some real documents, but as a rule the "window" for perfect AOA (orange doughnut only) is typically about 2 degrees. So somewhere from 16-18 would be reasonable. Some aircraft have a smaller window as well, so it's not perfect.
One thing perhaps others can clarify better is I'm not sure if the 17 degrees of alpha was for the "groove" or your turn in to the groove. Typically you fly your final AOA on the turn from abeam to the groove, but 17 degrees does seem a bit high to me and I'm not sure they have to be one in the same (i.e., perhaps in the groove you should be flying 14 degrees...or whatever).
SpazSinbad:
The FCLP 'text' and then the 'text in the graphic for carrier approach' clearly state use 17 degrees AoA for approach OR the computed airspeed for weight.
I could have highlighted with colour the line [which is slightly bolder than the others] in the graph which reads:
OPTIMUM APPROACH SPEED 17 UNITS AoA, Flaps 30°, Slats Out
I would say that if anything the RAZBAM model is wonky if there is an impression that 17 degrees AoA is too high. As for the other questions I have no idea. Perhaps there is an answer in the NATOPS? I'll have a look.
Attached is a PDF page made for my 4.4GB PDF available online - soon to be updated there.... ANYway like the A-4 the AoA indexer is not calibrated in actual degrees - but units. Below is the text from the Prowling NATOPS:
"2.11.8.1 ANGLE OF ATTACK Indicator.
The ANGLE OF ATTACK indicator is on the upper left side of the pilot's instrument panel. The pointer is driven by a servomotor and rotates over a card graduated from 0 to 30 units. Optimum angle of attack for landing approach is marked by a light area of the 3-o'clock position on the instrument (17 units AOA). The units do not reflect angle of attack in degrees. A readout window on the instrument face will indicate OFF if there is no power to the servomotors."
NATOPS TWO PAGES about AOA and STUFF attached now.
Striker:
predattak,
Spaz’s information is all that is likely to be available in finding the AOA in degrees since “The cam-operated switches in the angle-of-attack indicator also control the approach indexer.” Thus the optimum approach AOA in degrees is passed internally and not available.
I had this road block to be able to use vLSO with my T-28C which does not even have an AOA indicator or an Approach indexer. Likely others will have the problem as more aircraft are wanting to become supported in vLSO.
While there may well be other ways to get the AOA degrees for the 4.12 deg. and the 3.5 deg. glide slope, here are some suggestion:
1. Contact the Dev or the person who did the FDE for the sim model and ask if they will provide the AOA needed in degrees. It worked for me;
2. Look at the supported planes in present vLSO and see if there are any close to your airframe design since AOA is in part airframe specific(i.e.,S-3B Viking) . If so, load the AOA values data into vLSO and test fly using the onboard AOA indexer and the vLSO approach data record to fine tune the optimum approach AOA in degrees. The abeam variables should be available in the
http://air.felisnox.com/view.php?name=ea6b.pdf chapter 8 – Ship-Based Procedures.
SpazSinbad:
Attached are the 11 + cover pages of the aforesaid NATOPS Ship Based Procedures. In my experience reading other aircraft NATOPS is that they are all different in many ways. For various reasons (security?) a lot of info is just not there compared to older now obsolete aircraft perhaps. Anyway NATOPS is not called the 'big blue sleeping pill' for nothing. ;D
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