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A2A Simulations - Accu-som Core update 1.5 released

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This update applies to the Accu-Sim Spitfire, P-40, and P-51.


Summary of new features in Core Update v.1.5

- Airframe and engine physics tuned to give better feedback about how the engine is running and how the air is passing over the airframe

- New fuel burn coding now monitors more systems and air qualities, making for better simulated fuel consumption

- Various fixes and improvements after listening to our customers in our community (thank you to everyone who takes the time to tell us what you think)

- P-51 Military owners will see, from the cockpit, an improved main canopy frame and a re-designed upper nose area among other fixes and improvements

- P-40 owners get a new tailwheel and better tuned prop and flap drag curves

- Spitfire owners get a slightly more robust engine and those using the fixed pitch prop should see a longer engine life

Changes from v.1.4 to v.1.5


- Re-tuned airframe physics

- New fuel consumption code

- Cold start removes fuel from lines

- Engine state and hours won't be reset after update

- Mags more efficient for less RPM drop

- Battery charge now saved with the aircraft

- Batteries now charge fully in maint hangar (were receiving less than a full charge)

- Support for P-51 Modern / Civilian version

- Fixed an initialization bug with virgin flights

- Fixed bug in propeller drag physics

P-51 Military

- New thick canopy frame

- VC. Flatter nose area

- Clipboard now reads both nautical and statute miles

- Changed miles abbreviation from "m" to "sm" in pilot's notes

- Radiator more durable

- Adjusted fix in flight dynamics that was causing issues during slip maneuvers

- Tail wheel steering adjusted

- Original brakes for the military P51

- Aftercoolant bug fixed

- Battery amp hours increased from 34 (military Mustang) to 43

- Fuel burn changes

- Fixed bug in pilot's weight with cold and dark

- Added an X to close the radio control panel


- New tail wheel

- Reduced P-40 inertia starter torque

- AutoC&D doesn't reset set pilot's weight

- Tuned fuel consumption

- Added dedicated textures for the volumetric 3d landing light (was dependent on Spitire textures before)

- Tuned prop and flap drag for 25", full prop forward, -500ft/min, 110mph ias

- Improved texture lighting

- Fixed bug in elevator as seen from cockpit


- AutoC&D doesn't reset set pilot's weight.

- Tuned fuel flow

- Show Imperial and US units / mph / knots in clipboard

- Raised detonation ceiling for spitfires to help with takeoffs with fixed pitch prop

- Improved texture lighting



This core update includes ALL prior core updates


Always install the core update last

Always install the core update after you install any Accu-Sim core aircraft (P-40, P-51, Spitfire)


1. Aircraft

2. Accu-Sim

3. Accu-Sim CORE update


Changes from v.1.3 to v.1.4


- Engine hours and aircraft system states preserved (for those already on core update v.1.3)

- Fixed issue that caused one mag would sometimes not fire correctly

- Some changes to cabin humidity as cabin was fogging up during very humid days and rain


New features:

- Added Auto Cold & Dark option

- The pilot is removable

- Added engine hot metal cooling crack physics and sounds

- Added carburetor fuel return line (reserve tank)

- New temperature gauge physics in p-40

Improvements / Bug fixes:

- Increased aileron effectiveness at mid range speeds, reduced at high to match chart. Peak 95 deg sec at 270mph ias, 50 lb stick force.

- P-40 ram air / carb heat lever and logic fixed

- Brakes improvements


New features:

- Added Auto Cold & Dark option

- The pilot is removable

- Added engine hot metal cooling crack physics and sounds

Improvements / Bug fixes:

- Fixed Pneumatic pressure building after engine stops

- Increased pneumatic pressure useage with flap operation

- Direct drive electric starter torque increased


Improvements / Bug fixes

- Metallic material and texture improvements

- Minor fixes to some paint chips

- Shorter oxygen hose

- Increased aileron effectiveness slightly to match flight test. Peak 95 deg sec at 310mph ias, 50 lb stick force

- Fixed / improved some specular texturing

- Trim can be more finely tuned

- FSX external sound fix

- Added sounds to IFF panel, stores release, lower arming panel switches, and fuel selector switch

- Better tail wheel tire rotation

- Some shortcut fixes / improvements

- Lowered hydraulic pump output at lower RPM (fairing doors won't come up so fast)

- Made some edits that may help a few with aftercoolant running out

- Direct drive electric starter torque increased

- Brakes improvements

Changes from v.1.2 to v.1.3

- New oil system modeling. Based on A2A independent tests on live Merlin and Allison engines. Oil pressure is slower to rise, and pressures can be extremely high with cold oil. It is very important you observe oil temperature minimum temperatures before applying full power.

- Re-coded the magneto behavior on engine power

- Accu-Sim engine performance and drag envelopes better synched with FSX flight modeling

- Mach drag removed from FSX and fully controlled via Accu-Sim core

- Adjusted fuel starvation with clogged fuel filters

- Increased Co2 power for Spitfire emergency gear

- Wear power scalar to improve control over engine life for different engine types

- Some fuel system delivery tweaks, increased fuel pump output to avoid some pre-mature fuel starvation with very high power


- Sometimes moving to a new airfield from being in the air would result in the gear not being lowered.

- Reduced moisture put into the air by breathing


Changes from v.1.1 to v.1.2

- Re-designed hydraulics

- Reduced the speed of outside canopy fogging up

- Aircraft can be jacked up

- "Check engine" in mechanic's notes will be persistent and not disappear after you have checked the engine

- Updated spitfire configurator so shortcut works

- Re-tuned side forces in flight model

- Added fuel line size differences for each aircraft

- Battery charging is a consumer

- Fixed bug that may have been responsible for unrepariable hydraulic leaks

- Made adjustments to the detonation. It is more sensitive to higher CAT

- Spitfire has mechanical gear locks

- Radiator lever control works and sounds better when mapped to an axis

- Added additional fuel system modeling. Fuel first has to drop from tanks, then the fuel pumps need to pump and pressurize the system

- Gear repairs on ground puts plane on jacks and repairs

- Coolant consumption bug fixed

- Autostart primes fuel

- Engine heat damage after shutdown fixed (this was another bug)

- Humidity goes to 0 when air is freezing

- Battery doesn't drain when switch is off (Spitfire battery is always ON)

- Hydraulic pump failure fixed

- Smoother landing gear animation

- Random prop start position

- Engine wind-down friction tuned (9 sec for merlin to stop after mixture cut)

- Can now start engine on primer alone

- Code supports broken reduction gear (may not implement until P-51)

- Busted crankshaft will seize engine

- Fixed bug when touchdown sounds are heard in air under very high G load

- Fixed the way the engine sucks fuel into cylinders.

- Oil friction tuned

- Detonation system re-calibrated

- High speed shake support added with scalars for each plane

- Fixed engine popping

- Gear physics added. Gear is affected by weight and air forces. Gear locks up and down.

- Hydraulic hand pumps (spitI gear handle is a hyd hand pump) now uses pressure physics

- Improved gear system damage modeling. Gear locks can break and gear can jam

- Improved flaps damage modeling.


Changes from v.1.0 to v1.1

Changes affecting Spitfire MKI/II

- While Accu-Sim ignores the default FSX electrical system, we changed the FSX electrical system from 24v to 12v in aircraft.cfg for continuity

- New engine oil and coolant algorithms representing internal mass inertia and coolant flow passing through a large engine. This means the engine can be quicker to heat up and slower to cool down.

- MkI flaps warning says 160 MPH instead of 140 MPH

- MkII cockpit: flaps warning says 160 IAS; maximum speeds converted to MPH

- New trigger for the MkI

- Aircraft.cfg atc_type=Supermarine

- Added additional physics to airframe vibrations. Vibrations are both more precise and dynamic

- Slightly lowered shake effect on our manifold pressure gauge

- Engine fire logic re-coded. Engine fires start based on high temps, eng cyinder condition, and engine oil system condition (representing oil outside of engine)

- Engine oil consumption increased. Can be as high as 4gph with a very worn engine (past TBO), not including leaks

- Brighter, weathered windshield screws to match existing worn cockpit

- RPM value that was feeding to FSX was reversed on the 2-speed prop. Accu-Sim was compensating for this, so changes should not be very noticeable, but working numbers are more consistent

- Engine remembers if it was running before exit

- Elevator and rudder trimwheels animation: 4 turns for full work range

- Fuel tanks on spit upgraded to new standard, should scale accurately with pitch changes

- Fixed gear collapsing bug

- Radiator flap positions changed to: 1. Closed/guns warming, 2. Normal flight, 3. 1/4 open, 4. 2/4 open, 5. 3/4 open. 6. Fully open

- New, less bluish glass

- Fuel gauges tooltips don't read any value when buttons are not pressed

- Runway thumps

- Removed A2A_Spit.dll

- Fixed error with low RPM combustion firing

- New physical fuel pressure physics. You can see this at very low RPM (when engine is cranking or winding down)

- New supercharger code module (supports multiple stages, draw, efficiency, and efficiency changes with different air pressures). Simply allows Accu-Sim to better simulate supercharged performance in all air conditions

- Removed files from aircraft panel folder that were moved to central folder

- Excessive bearing wear on startup and shutdown fixed

- Adjusted fuel delivery impact on engine combustion

- Smoother prop sounds for startup and shutdown when canopy is opened

- New "plastic" seat for the MkII

- Coolant overtemp relief valve blows roughly 1/10 gal per min

- Some texture and bump improvements

- Come copper internal components replaced with brass

- Removed default fuel pump sounds from spitfire sound.cfg's


- Multiplayer propeller visibility and rotation issue

- Landing flaps animation should be visible in MP

- Possible fix for the trolley and wheel chocks MP visibility issue.

- Disabled and renamed cartridge starter visual effect due to multiplayer error

Changes only affecting other aircraft in development

- Electrical system standardized to support all aircraft

- Electrical prop system added (P-40 Curtiss Electric prop)

- Electric prop does not draw electricity when at the stops

- Added drag system to P-40

- Fixed an issue with the wobble pump and fuel pressure

- Electrical voltage outputs set for each aircraft

- Initial P-51 cockpit sounds added (P-51)

- Fuel sloshing physics

- RPMGaugeSwayPhysics customizable for each aircraft

- Completed hydraulic system including actuator support for drooping gear doors in P-51

- New ground bump physics added

- RAM air and Carb heat systems implemented

- Engine piston suction bug fixed

- Oil dilution support added

- Inertia starter support (P-40)

- Manifold Pressure Regulator support (P-51)

- Oil cooler flaps (P-51)

- Automatic coolant and oil cooling systems (P-51)

- Electric fuel primer support (P-51)

- Hydraulic and Pneumatic brakes, flaps, and gear system support

- Initial turbo-jet engine physics modeling and sound module added (F-104)

- Manual wobble pump support (P-40)

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