Post by VSL-Admin on Jul 22, 2023 21:08:20 GMT
Requested by several 'New XP12 Adventurers': Here is a short video of the VSKYLABS Skyscenders 76' - Machbully, demonstrating a quick takeoff-to-landing sequence.
*sorry for sound-issues in the recording...
Landings can go extremely aggressive with the Machbully - the one in this video is quite calm and shallow...with a long final and long hover-taxi before the 90 degrees turn down the runway, for touchdown.
Official video-flying tutorials for the VSKYLABS SSC76' are in the making and will be available in the near future!
There are several methods of landing the Machbully, here is one:
In short:
Make yourself a long, straight final approach (longer than seen in this video, for start).
Once you are all set, reduce throttle to idle and let the aircraft decelerate to ~250 knots. As the speed will bleed off, you will have to compensate with nose attitude as with a conventional aircraft.
Then, when at ~250 knots IAS, reduce the landing gears. This will trigger the VTOL mode, and the huge nacelles will also act as huge air-brakes (in addition to the large skid).
Now comes the tricky part:
You will notice an increase in descent rate, and you would be tempted to raise the nose...this is due the fact that the main thrust vectoring is articulating to vertical mode, and with the throttle at idle, the aircraft will start sinking significantly.
So...as soon the the gears are down at ~250 knots, INCREASE the throttle, to compensate the increased sink-rate. Increase the throttle without hesitation.
Speed will continue to bleed even if the throttle is quite high - remember, the nacelles are transitioning to vertical position, and soon, the throttle alone will not determine your forward speed...
While you throttling up, keeping the nose high but in a comfortable attitude...not too high. If the approach is steep enough, you can still see the runway easily.
Once the thrust vectoring mode will exceed *VTOL*, keep the throttle up and you will notice that the Machbully can continue on a "decelerated final" at around 100 knots, in VTOL mode, with power management (do not afraid to throttle up).
Check and set the velocity vector in the HUD to an estimated touchdown point. But note this: It WILL NOT be the actual touchdown point, but the point in which you will transit to hover-taxi. So it is quite in the undershoot, related to the actual touchdown point.
For example, it could be the 'zebra', but know that from that point, you still have declaration to make, but it is easily done in hover-taxi speed (below 50 knots).
From now on...pretty much like a stable helicopter. Nose attitude and direction with throttle control will determine overall flying vector. Beginners: Keep it simple not to get lost in the hover...
Slowing down to zero speed for landing can be done straight forward, or, with a 90 degrees yaw (as seen in this video).
WARNING:
The approaches and landings can be really aggressive, but it requires practice.
The Machbully is a total aerodynamic brick below ~300 knots, and requires power to have sufficient pitch authority (due thrust vectoring of the nozzles for pitch).
You can see in the video that there's a point on final in which the nose is "floating around" a little bit. This is indication that speed was too slow for the actual maneuver (high angle of attack, slow speed). If an aggressive approach is needed, it is better to come steep and to kill the descend rate with the wings STRAIGHT AND LEVEL...the engines of the Machbully are brutal ("Mach-Bully") and it can stop even a really high sink rate. But doing this during a turn - it's one of the weak-spots of the Machbully design...
The downside in the demonstrated approach in this video is that it was very shallow and the turn to final was *horizontal*.
This combination (shallow + horizontal + high alpha turn) may get the Machbully into stability issues, especially when flying below 350 knots, and when transitioning from horizontal to VTOL mode during a high-g / high bank turns.
A more comfortable method is to get yourself a longer final approach, or to come hot vertically, instead of horizontal deceleration. A kind of an aggressive split-s for final approach is also an option, especially for landing in confined areas.
*sorry for sound-issues in the recording...
Landings can go extremely aggressive with the Machbully - the one in this video is quite calm and shallow...with a long final and long hover-taxi before the 90 degrees turn down the runway, for touchdown.
Official video-flying tutorials for the VSKYLABS SSC76' are in the making and will be available in the near future!
There are several methods of landing the Machbully, here is one:
In short:
Make yourself a long, straight final approach (longer than seen in this video, for start).
Once you are all set, reduce throttle to idle and let the aircraft decelerate to ~250 knots. As the speed will bleed off, you will have to compensate with nose attitude as with a conventional aircraft.
Then, when at ~250 knots IAS, reduce the landing gears. This will trigger the VTOL mode, and the huge nacelles will also act as huge air-brakes (in addition to the large skid).
Now comes the tricky part:
You will notice an increase in descent rate, and you would be tempted to raise the nose...this is due the fact that the main thrust vectoring is articulating to vertical mode, and with the throttle at idle, the aircraft will start sinking significantly.
So...as soon the the gears are down at ~250 knots, INCREASE the throttle, to compensate the increased sink-rate. Increase the throttle without hesitation.
Speed will continue to bleed even if the throttle is quite high - remember, the nacelles are transitioning to vertical position, and soon, the throttle alone will not determine your forward speed...
While you throttling up, keeping the nose high but in a comfortable attitude...not too high. If the approach is steep enough, you can still see the runway easily.
Once the thrust vectoring mode will exceed *VTOL*, keep the throttle up and you will notice that the Machbully can continue on a "decelerated final" at around 100 knots, in VTOL mode, with power management (do not afraid to throttle up).
Check and set the velocity vector in the HUD to an estimated touchdown point. But note this: It WILL NOT be the actual touchdown point, but the point in which you will transit to hover-taxi. So it is quite in the undershoot, related to the actual touchdown point.
For example, it could be the 'zebra', but know that from that point, you still have declaration to make, but it is easily done in hover-taxi speed (below 50 knots).
From now on...pretty much like a stable helicopter. Nose attitude and direction with throttle control will determine overall flying vector. Beginners: Keep it simple not to get lost in the hover...
Slowing down to zero speed for landing can be done straight forward, or, with a 90 degrees yaw (as seen in this video).
WARNING:
The approaches and landings can be really aggressive, but it requires practice.
The Machbully is a total aerodynamic brick below ~300 knots, and requires power to have sufficient pitch authority (due thrust vectoring of the nozzles for pitch).
You can see in the video that there's a point on final in which the nose is "floating around" a little bit. This is indication that speed was too slow for the actual maneuver (high angle of attack, slow speed). If an aggressive approach is needed, it is better to come steep and to kill the descend rate with the wings STRAIGHT AND LEVEL...the engines of the Machbully are brutal ("Mach-Bully") and it can stop even a really high sink rate. But doing this during a turn - it's one of the weak-spots of the Machbully design...
The downside in the demonstrated approach in this video is that it was very shallow and the turn to final was *horizontal*.
This combination (shallow + horizontal + high alpha turn) may get the Machbully into stability issues, especially when flying below 350 knots, and when transitioning from horizontal to VTOL mode during a high-g / high bank turns.
A more comfortable method is to get yourself a longer final approach, or to come hot vertically, instead of horizontal deceleration. A kind of an aggressive split-s for final approach is also an option, especially for landing in confined areas.