[REPORTED] Payload effect on airspeed - ED Forums
 


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Old 07-09-2018, 05:59 AM   #1
J13 Serenity
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Default [REPORTED] Payload effect on airspeed

recent tests showed: all speeds approximate
Clean spitfire (long wings) 1000 feet speed: ~320 mph
Spitfire with any drop tank speed: ~320 mph
Spitfire After any drop tank jettisoned: ~320 mph
Spitfire with 2 bombs: ~320mph
Spitfire with 3 bombs: ~320 mph
Spitfire after dropping any bomb configuration (Bomb pylons remain): ~370 mph!!!
Almost as fast as FW190 with MW50!!!
Spitfire after bomb pylons jettisoned: back to ~320 mph!!!
The canopy open or closed apparently has no effect on speed

Other things:
Canopy glass is still present with canopy opened

Last edited by J13 Serenity; 07-09-2018 at 08:12 AM.
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Old 07-09-2018, 09:29 AM   #2
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There is a youtube video reporting the opposite thing.

The speed is changing with different stores.
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Old 07-09-2018, 10:04 AM   #3
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I think that there is not calculated (probably) external stores drag, it seems that only weight is.
I had similar resutls like Serenity.

I tried only stores under fuselage and when they were carried by Spitfires (for both models) the loss of speed was around 2-4km/h (external view F2 - True Speed) - it is totaly marginal, nearly nothing, it looks like loss due to increased plane weight.
When i dropped external fuel tanks, speed went back to the same speed like clean Spitfire flies.

But, when i dropped 500lbs bomb, Spitfire got some kind of "extra boost" and speed rose 24km/h above speed reached with clean Spitfire, again both models.

Did not tried efect caused by undewings stores and did not tried to release pylons.

All tests i performed with the same conditions and flight path...
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Old 07-09-2018, 04:49 PM   #4
J13 Serenity
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Don't know about video with opposite results, but know that me and my friends were chasing and overtaking BF109 and WF190 on Burning Skies yesterday with bomb pylons... And that by having 3 bombs I was easily maintaining formation with friends on clean spitfires maintaining same MP and RPM...
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Old 07-09-2018, 08:01 PM   #5
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Thats wrong for sure.

Thanks for the test, i hope ED will test the FM, drag, and perfomance with external stores in next updates.
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Old 07-10-2018, 01:46 AM   #6
J13 Serenity
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S!
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Old 07-10-2018, 03:45 AM   #7
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Quote:
Originally Posted by Esac_mirmidon View Post
There is a youtube video reporting the opposite thing.
The speed is changing with different stores.
If you are talking about my video then no, it doesn't show the opposite thing.

I was very confused when there was no speed increase after tank release, but the speed DID keep climbing after the bomb drop. This matches the results that Serenity got here.

Something is very wrong with the FM now, and it relates to the tanks and bombs. 18 months this has been worked on, apparently...
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Old 07-10-2018, 06:47 AM   #8
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Anyone try the clipped wing yet? Im on hiatus from DCS, though I do lurk on the forums waiting for the Tomcat.
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Old 07-10-2018, 11:59 AM   #9
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Quote:
Originally Posted by OnlyforDCS View Post
Anyone try the clipped wing yet? Im on hiatus from DCS, though I do lurk on the forums waiting for the Tomcat.
loads of people online are flying it.
I prefer the C wing, personally.
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Old 07-10-2018, 01:37 PM   #10
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Quote:
Originally Posted by OnlyforDCS View Post
Anyone try the clipped wing yet? Im on hiatus from DCS, though I do lurk on the forums waiting for the Tomcat.
If the CW is an accurate reflection of what I've read happened in reality, then:
- The CW is slightly faster at low altitude (sub 20k feet)
- The CW is slightly slower at higher altitudes (above 20k feet) and has a slower climb rate
- The CW accelerates faster at lower speeds. Got the impression that it wasn't a major difference
- The roll rate/sec increased by something like 50%

In short, the CW would generally be better for low altitude work and suddenly has a roll rate that allows it to keep pace with a 190.
Here's a chart I found on roll rates, as they are speed dependent:
http://www.wwiiaircraftperformance.o...-rollchart.jpg
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