HF2 Engine performance off

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matpietsch
Posts: 268
Joined: Sat Dec 21, 2019 10:02 pm
HF2 Engine performance off

Post by matpietsch » Mon Feb 03, 2020 8:58 pm

According to Textron, a company which by its nature is not shy about marketing the speed of theis plane, gives the 350i a top speed of 312 KTAS.

https://beechcraft.txtav.com/en/king-air-350i

In the sim at FL290 I can EASILY, without pushing the engine super ultra hard, maintain a KTAS of 322. Before the update I had to push the engines really hard to get 315KTAS.
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wells
Posts: 61
Joined: Sat Jul 04, 2015 12:08 am
Re: HF2 Engine performance off

Post by wells » Mon Feb 03, 2020 9:15 pm

Max cruise power is at 1500 RPM

Max speeds given in the cruise charts in ISA conditions are

14000 lbs - 309 ktas @ 22000 ft, 92% torque
11000 lbs - 315 ktas @ 24000 ft, 87% torque

312 is given at 29000 ft, at 11000 lbs, with 73% torque and 1500 RPM

Individual airframes could vary by probably +/- 10

matpietsch
Posts: 268
Joined: Sat Dec 21, 2019 10:02 pm
Re: HF2 Engine performance off

Post by matpietsch » Mon Feb 03, 2020 9:55 pm

It seems off that I can push this thing to more than 330 KTAS at 1600 rpm and Fl290 then.
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Taguilo
Posts: 658
Joined: Sun May 11, 2014 11:49 am
Re: HF2 Engine performance off

Post by Taguilo » Tue Feb 04, 2020 1:50 am

Engine Performance in similar characteristics is quite on spot:

engine1.jpg
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engine2.jpg
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Actually Fuel Flow displayed is not correct, but calculated and not displayed (350 lbs/hour) is right. Will be fixed for the SP.

Tomas

Raptor
Posts: 411
Joined: Wed Feb 26, 2014 3:07 am
Re: HF2 Engine performance off

Post by Raptor » Tue Feb 04, 2020 2:29 pm

matpietsch wrote:
Mon Feb 03, 2020 9:55 pm
It seems off that I can push this thing to more than 330 KTAS at 1600 rpm and Fl290 then.

2020-2-3_22-54-27-719.jpg
You are showing a 73knts tailwind

matpietsch
Posts: 268
Joined: Sat Dec 21, 2019 10:02 pm
Re: HF2 Engine performance off

Post by matpietsch » Tue Feb 04, 2020 5:10 pm

Whis is not relevant as we are talking TAS not GS.

spencer.hoefer
Posts: 44
Joined: Sun Jan 05, 2020 8:23 pm
Re: HF2 Engine performance off

Post by spencer.hoefer » Tue Feb 04, 2020 10:37 pm

One thing I noticed is that you are climbing near max climb ITT. While theoretically possible to climb with that much power, it is recommended to keep your ITT levels around 785C during climb.

matpietsch
Posts: 268
Joined: Sat Dec 21, 2019 10:02 pm
Re: HF2 Engine performance off

Post by matpietsch » Wed Feb 05, 2020 8:06 am

I know. I was purposefully pushing the engines to the itt limit to see how fast it will go. And it is a lot faster than it should (at least to me).

jarek
Posts: 120
Joined: Tue May 22, 2018 5:04 pm
Re: HF2 Engine performance off

Post by jarek » Fri Feb 07, 2020 1:18 pm

It is not faster than it should, simply because there is no ITT given in the cruise tables. They specify only recommended power setting that should produce other parameters listed there. These tables propose just single torque value and will take into account variations between series of engines to always stay on the safe side with some quite big margin. With these settings used you should not cross 800 normally for ITT, especially for conservative settings called Normal Cruise Power.
If you push it to the ITT limit, with gauge accuracy you can't tell if you are still at 820 are maybe at 825, Will it be faster - yes, will it be still safe - questionable in this case.


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