BO-105 PAH1A1 progress news

[Marshallman]

Visited the Helicopter museum Today Weston Super Mare UK.....Well worth a visit for Heli enthusiasts.

Sat in the middle of it all was a  BO-105.

Hurry up please!!! 

Edited November 28, 2024 by Marshallman

[Scarecrow84]

So there was a mention of a flight model demo video a while back. That would be cool.

[The_Fragger]

 
Multiple animations on one mesh   ...and it works inside DCS

 

[Raven (Elysian Angel)]

Nice! Will there be a working visor for that helmet, or aviator sunglasses?

[The_Fragger]

On 12/28/2024 at 5:26 PM, Raven (Elysian Angel) said:

Nice! Will there be a working visor for that helmet, or aviator sunglasses?

Yes !

[YoYo]

And what else?  You've been showing this guy for half a year ;). Any news for the new year, screenies, video of the model direct in DCS and when will the module be released more or less (some goal for you pretty please)?

Edited January 1 by YoYo

[Raven (Elysian Angel)]

4 hours ago, The_Fragger said:

Yes !

Brilliant! Words fail me when I try to communicate how much I’m looking forward to flying this little helo!

Edited January 1 by Raven (Elysian Angel)
minor grammar fix

[The_Fragger]

53 minutes ago, YoYo said:

And what else?  You've been showing this guy for half a year ;). Any news for the new year, screenies, video of the model direct in DCS and when will the module be released more or less (some goal for you pretty please)?

Soon. But first we need to figure out how to get the sounds working in DCS.

[The_Fragger]

The following images demonstrate how we calculate engine behavior in a simulation. The first step is to assemble physical graphs, which reflect the parameter development under different conditions. For example, the temperature development in the combustion chamber and the turbine outlet on base of available fuel, oxygen, temperature and pressure arriving from the compressor:



The next step will be a test with our jet engine test application:

 

The image above shows a situation during startup, while the engine is driven by the starter generator. It can easily be seen that the compressor temperature of 107.2 °C is too high for the observed N1 RPM at 10%. It needs to be adjusted to approximately 50 °C, which is close to the kerosine flashpoint. The jet engine test application allows us to calibrate all graphs online to see the results in the gauge displays. The behavior is always compared to the official documents and to real time diagrams recorded during real flights. The image below shows a real startup of the BO-105 left engine Allison 250-C20B.

 

This method results in real-world behavior during a simulation. The functions are coded with the MEDUSA multitask system, which was developed especially for flight simulations.
 

To make the article clearer: The first image, showing the combustion and outlet temperature, is one single example of how the development of physical values is managed. This is done for all parts of the engine. The second image shows our test environment for jet engines. The gauges show the current condition of the compressor, Combustion Chamber,N1and N2 with temperature, pressure, and air speed. The bleed air valve condition is shown in the N1 RPM% gauge. There are two movable marks on the scale. The green mark is the RPM% border for a fully open bleed air valve. Values above the red RPM% border cause a fully closed bleed air valve. The position of the marks is movable depending on the outside air temperature. Even the combustion chamber internals are shown in temperature and air speed. The next stage is the N1 turbine fan driven by the expanded air mass and speed. The N1 turbine fan is fixed to the compressor shaft. So, the N1 RPM% gauge also shows the condition of the N1 turbine fan. Behind the N1 turbine fan, the N2 turbine fan receives the airstream, which is slightly degraded in speed, temperature, and pressure. This is displayed as N2 RPM% and torque. In addition, the N2 torque is transferred to the engine gearbox. The output shaft torque of the gearbox is shown in the same column. Finally, the forces impacting the rotor shaft are displayed. The entire calculation could be simplified to one formula with the disadvantage that a partial malfunction of a single engine and its result chain would not be noticed. Therefore, we go as deep as possible into the physical rules of every single part of the engine. The engine condition, shown with the gauges in the second image, is not finally tuned. As you have noticed, there is a discrepancy between compressor RPM, pressure, and temperature which needs to be calibrated. Here we can play with the compressor blades surface area, its lift coefficient and the air duct area. At that point, we are at the limitations of physical calculations. We cannot include the effects of blade vortexes, curves in airducts and specific lift coefficients. We calculate with straight values and following the graphs based on special formulas. We adjust the values to come to the same results as in the real world. This is even the reason that it takes that time to finalize the project.

The third diagram image does not display a simulation session. It shows the startup of the left engine of a real BO-105. The values are taken from the cockpit instruments. Since there are no engine air pressure gauges available in the cockpit, we were limited to what could be seen in the cockpit. The fluctuations of the graph lines were mostly caused by the pilot, who did not move the throttles with one smooth speed.

Edited January 19 by The_Fragger
adding Details

[MAXsenna]

So sad it wasn't shown off in yesterday's video.

Sent from my SM-A536B using Tapatalk

[The_Fragger]

1 hour ago, MAXsenna said:

So sad it wasn't shown off in yesterday's video.

Sent from my SM-A536B using Tapatalk
 

Yeah. But be sure that we are heading for a release in 2025

[Tom Kazansky]

6 minutes ago, The_Fragger said:

Yeah. But be sure that we are heading for a release in 2025

BO-105 and Germany map in the same year would be... delicious.

[MAXsenna]

Yeah. But be sure that we are heading for a release in 2025

Are you serious! Christmas will come early then!
Pretty sure this will be my favourite!

Sent from my SM-A536B using Tapatalk

BO-105 and Germany map in the same year would be... delicious.

Gonna do slalom in the forest under powerlines.

Sent from my SM-A536B using Tapatalk

[Raven (Elysian Angel)]

1 hour ago, The_Fragger said:

Yeah. But be sure that we are heading for a release in 2025

Music to my ears!

 

1 hour ago, MAXsenna said:

Gonna do slalom in the forest under powerlines.

You and I both!  

[Scarecrow84]

On 1/17/2025 at 11:18 AM, The_Fragger said:

Yeah. But be sure that we are heading for a release in 2025

[cfrag]

On 1/17/2025 at 5:18 PM, The_Fragger said:

But be sure that we are heading for a release in 2025

Stop talking and start chalking! This money in my hand doesn't spend itself, you know???

 

[Hiob]

I'm getting less and less excited about upcomming modules (mostly due to saturation probably) - this one is the exception. I feel so strongly connected to this one and have so much good faith in the guys making it, that I really can't wait!

[The_Fragger]

External Model Crew animation (added eye movement):

Everything is working as excepted:
null

 

Edited January 24 by The_Fragger
Grammar

[cfrag]

13 hours ago, The_Fragger said:

Everything is working as excepted:

You know, at some point your tantalizing posts cross over into outright cruelty...