< XA-31 Panorama >
AIRCRAFT FLIGHT PROFILE AND SPECS
 



 

SPECIFICATIONS:

Dimensions:
     Length = 40.0 ft
     Height = 13.0 ft
     Wingspan = 91.0 ft


Weights:
     Empty = 12,000 lb
     Payload = 1,000 lb
     Jet fuel load = 1,400 lb
     Rocket fuel load = 13,578 lb
     MTOW = 28,000 lb

Engines:
     2x High-bypass jets
          Max thrust = 12,000 lb
          Afterburners = < no >
          SFC = 0.55 lb/lb/hr

     1x Solid rocket (jato)
          Max thrust = 40,000 lb
          Specific weight = 13.0 lb/lb/hr

 

 

  LIMITATIONS:

 
VSO   73 KIAS
VS   83 KIAS
VFE 240 KIAS
VNO 350 KIAS
VNE 410 KIAS
MAX POS G 6.6
MAX NEG G 2.6

FUEL TANKS SPECS:

Placement:
     Jet fuel = Main wings
     Rocket fuel = middle/rear fuselage body*
 
(*) The rocket fuel tank can be verified directly in the plane's model once it is actually modeled inside the fuselage body. One finest way is to open the fuselage editing pane in Plane-maker's  "Standard" menu and turnoff the switch that says the plane has fuselage.


Main wing airfoil = NASA LS(1)-0417 (hi-lift)


Crew Arrangement
3 adults fully equipped with pressurized spatial safe suits

cargo capacity = 3x 247 lb (each passenger) + 200 lb cargo




(all drawings to scale)


(pilot and passengers in front-view sectional cuts)

 


Flight Profile
The flight is divided in 5 phases or stages:
 

 Phase 1  High altitude climbing using Jet engines at maximum power and air surfaces lift
 Phase 2  Extra atmospheric launch using Rocket engine and thrust manouverers (puffers)
 Phase 3  Reentry dive and air frenage by Gravitational pulled free fall plus speed-brakes frenage
 Phase 4  High altitude return flight using Jet engines at economical power and air surfaces lift
 Phase 5  Steep descending glide using Jet engines at idle and flap assisted lifting


 



Tabled stages

Phase 1
N1
Pitch
ETA
Altitude
IAS
Remaining Jet fuel
 START PROCEDURE:   throttle jet engines to maximum, release the brakes and start the timer
100%
31°
01:05
10,000 ft
190 kt
1,210 lb
100%
24°
02:07
20,000 ft
151 kt
1,080 lb
100%
18°
03:35
30,000 ft
137 kt
947 lb
100%
15°
05:44
40,000 ft
105 kt
805 lb
100%
12°
10:22
50,000 ft
92 kt
619 lb
100%
10°
13:38
54,000 ft
91 kt
531 lb
100%
15:32
56,000 ft
91 kt
478 lb
100%
17:48
58,000 ft
90 kt
424 lb
100%
20:43
60,000 ft
90 kt
367 lb
 FINAL PROCEDURE:   turnoff jet fuel mixture and stop the jet engines


 

HOW TO FOLLOW THESE TABLES:    
For each line you must consider that the line's data numbers are meant to be the setting to achieve the respective altitude and velocity. For example, starting from 0 ft altitude the best climbing solution would be:

- Keep N1 at 100% during all the sub-stage ascending, that is from prior altitude (0 ft) to this sub-stage altitude (10,000 ft);
- Keep Pitch at 31 degrees (positive) during all the ascending sub-stage;
- The predicted ETA would be 1 minute 5 seconds to reach the ending sub-stage altitude;
- The predicted velocity would be 190 KIAS at the end of this sub-stage altitude;
- The predicted remaining jet fuel would be 1,210 lb at the
end of this sub-stage altitude;


 

Phase 2
N1
Pitch
ETA
Altitude
Note
Remaining Jet fuel
 START PROCEDURE:   ignition of rocket engine
0%
75°
23:40
199,000 ft
rocket finished
360 lb
0%
75°
25:23
360,000 ft
-
360 lb
 FINAL PROCEDURE:   adjust plane's pitch to 0 degrees


 

Phase 3
N1
Pitch
ETA
Altitude
Vtrue
Remaining Jet fuel
 START PROCEDURE:   adjust plane's pitch while descending in free fall - start jet engines below 285,000 ft altitude;
                                           use full speed-brakes to avoid plane overpassing speed limit between -60 to -30 degrees of pitch
100%
55°
26:00
285,000 ft
1544 kt
360 lb
100%
27:36
132,000 ft
1688 kt
360 lb
100%
- 90°
27:41
125,300 ft
1707 kt
360 lb
100%
- 30 °
27:56
  76,250 ft
1072 kt
360 lb
100%
28:10
  69,200 ft
  557 kt
360 lb
 FINAL PROCEDURE:   trim the plane to horizontal flight and prepare to return to launching base


 

Phase 4
N1
Pitch
ETA
Altitude
IAS
Remaining Jet fuel
60%
45:10
65,000 ft
90 kt
280 lb
 PHASE PROCEDURE:   keep flying direct to launching base heading by GPS, holding altitude, fuel flow and attitude.


 

Phase 5
N1
Pitch
ETA
Altitude
IAS
Remaining Jet fuel
 PROCEDURE:   set jet engines to idle and trim the plane to VVI: -4,000 ft/min descending glide slope at 60 nm distance of runaway;
                             use full flaps and half speed-brakes to hold VVI and IAS. Landing procedure is standard to heavy-metals.
20%
-10°
01:07:00
3,000 ft
70 kt
170 lb
60%
01:12:20
0 ft
0 kt
110 lb


 


.:: IMPORTANT  WARNINGS ::.

(1) Do not overpass the designed speeds. The plane's jet engines have enough power to push over the limiting speeds in level flight. Their available power is meant to take the plane to high altitudes by way of high pitches attitudes.

(2) All flight tests were done with all settings put to realistic and all limiting switches in the warning pane turned on. The above flight profile can be easily and consistently repeated without tearing-off any wing or flaps.

(3) The timer for the above time tables was activated as soon as the plane started its running for takeoff, after the release of the wheel brakes.

(4) The plane was rolled to its first ascending phase at 31 degrees pitch as soon as the runaway was cleared, without getting further distance or altitude. All the sub-stages of Phase-1 can be performed using only the elevator trim wheel. Ditto for Phase-4 and the descending sub-stage of Phase-5.

(5) The plane's stall warning will flash in two situations and it must be ignored in both: first during extra atmospheric rocket launch while holding the necessary 75 degrees pitch. Second, during some moments of the reentry, mainly while pulling back after the -90 degrees nose drop.

(6) Although the plane's nose probe first intention and use was to gather flight data, it was further converted to an air-refueling probe permitting the plane to be aided in any special situation.

(7) The aileron trim indicator acts as a switch for resetting the aileron trim wheel. To do it just click in the center of the indicator -- this can be checked with show_mouse_areas feature turned on.

(8) The jet fuel onboard is enough to bring the plane back to its launching base, provided the return trip be done at the highest suggested altitude.

(9) All flight tests were done in midday clear weather conditions, with no winds and using an airbase at sea level. Airbases situated in higher landscapes can provide better economy both for jet fuel and mission time.

(10) The plane's simple navigation resources (the GPS) was the only aid used in every flight to get back to airbase so it is supposed to be enough for any mission profile.


Author: Marcelo Magalhaes Marques   < mmmrqs@unisys.com.br >
Origin.: Rio de Janeiro city, Brasil

XP Version: 6.16
(IT IS RECOMMENDED TO AVOID THE v6.2+ GENERATION FOR THESE EVALUATIONS BECAUSE IT CAN AFFECT THE ABOVE MEASURED DATA DUE THE NEW "IMPROVEMENTS" AUSTIN MEYER DID :)

Visit the Lemonade X-Factory