wait for flight model review F18 Climb Rate/speed bleed Concerns

[nighthawk2174]

So I've had a concern for a while that the F18 was loosing to little speed while climbing, especially while zoom climbing.  I recently decided to test it comparing DCS to the video below for zooming and the the -200 performance charts for a more steady rate climb.  The video shows a ~6g 4.2aoa pull up to 70° starting from the horizontal at ~627kts and ~1280ft agl.  As a note, I believe he was in burner at least until my cutoff point at 6300ft, sun hides speed an altitude numbers after this point, due to the relatively low alpha and how consistent it was through the pull up.

 

 

Time to 6300ft - Average of 3 runs
Video|DCS 100% fuel|DCS 25% fuel

~9.5sec|~7sec|~6sec|

 

Speed at 6300ft - Average of 3 runs

Video|DCS 100% fuel|DCS 25% fuel

451kts|553kts|575kts|
 

Military Power time to climb.  35,000lbs maintain 350kts to 30,000ft then maintain mach.  Average of 2 runs.

            -200|DCS

5,000    - 15|17sec

10,000  - 35|38sec

20,000 - 105|89sec

30,000 - 195|170sec

40,000 - 290|287sec

 

Maybe I'm completely off base and did something wrong in testing but hopefully ED will take a look at the rate at which the F18 climbs, especially in AB, and how much speed it looses in a zoom climb.

[Hulkbust44]

Did you have pylons or no pylons?

Mobius708

[nighthawk2174]

no pylons, iirc this was a blue angles jet and I haven't seen them do a show with pylons.

Edited August 7, 2021 by nighthawk2174

[Hulkbust44]

no pylons

What are the -200s configuration conditions?

Mobius708

[nighthawk2174]

Just now, Hulkbust44 said:

What are the -200s configuration conditions?

Mobius708
 

Also no pylons clean jet.

[wilbur81]

If this is an A model, our Lot 20 C has the GE402's so there's a potentially significant difference there. Pressure altitude/air temp wherever that demo was could be a factor as well... and we don't know when (if) the pilot pulled out of afterburner.

Edited August 8, 2021 by wilbur81

[nighthawk2174]

2 hours ago, wilbur81 said:

If this is an A model, our Lot 20 C has the GE402's so there's a potentially significant difference there. Pressure altitude/air temp wherever that demo was could be a factor as well... and we don't know when (if) the pilot pulled out of afterburner.

 

Rog I believe its a C with the engines in game but I ofc could be wrong.

[wilbur81]

17 minutes ago, nighthawk2174 said:

Rog I believe its a C with the engines in game but I ofc could be wrong.

By the way, it's possible that he wasn't even in burner at the start of the climb as his Mach number was hitting 0.97ish in level flight right before the pull up and crossing the number would be a big no-no at an air show. He may have had to go Mil power to keep from Boomn'.

Edited August 8, 2021 by wilbur81

[nighthawk2174]

I don't know imho considering how consistent his alpha was through the turn indicates otherwise at least up to a certain point.

[BIGNEWY]

A full flight model review is in progress,

 

sadly videos like this are not much help as we do not know how the aircraft has been configured as the FCS can be tweaked for display work, also we do not know which version or block is being used. 

 

thanks