that would make for a really slow start up... how long would you say from pressing the start button to 100% rotor speed ?
Could you do us a favour and watch this video of a real start-up (unedited) and explain what's happening at what time up to take-off
https://youtu.be/NRd-yMT_5NE
cheers
Simon
Search found 1379 matches
- Fri Mar 05, 2021 12:45 pm
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
- Thu Mar 04, 2021 2:13 pm
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
Re: Bell UH-1
not a problem
So are the two needles on the RPM gauge always together after 10% N1 ?
I'm assuming the RPM engine is N1 and not N2
And is the rotor rpm's the actual rotor rpm's or N2 ?
So are the two needles on the RPM gauge always together after 10% N1 ?
I'm assuming the RPM engine is N1 and not N2
And is the rotor rpm's the actual rotor rpm's or N2 ?
- Thu Mar 04, 2021 1:06 pm
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
Re: Bell UH-1
And whilst I'm on.... The rpm gauge, rotor and engine rpm... My thoughts on this are that the engine cranks up, the engine needle moves slowly to 60% at which point the engine starts. Rpm's above 60% start to engage the rotor clutch and as such the rotor rpm's start to increase. The turbine now has ...
- Thu Mar 04, 2021 12:50 pm
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
Re: Bell UH-1
I have another question.... It's to do with turbine power output and the rotor blade pitch and how the 'collective' works. A) In my mind I have raising the collective adjusts the rotor blade pitch directly.. doing so the power needed to maintain rotor (and by direct connection) the turbine running a...
- Mon Mar 01, 2021 9:26 am
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
Re: Bell UH-1
ok I see the problem.
The turbine has low inertia, you start it and run it up. At a certain rpm the clutch slowly engages spinning the rotors. The rotors have high inertia and acts as a 'flywheel' on the turbine. This steadies the rpm fluctuation on the turbine with sudden increased load.
The turbine has low inertia, you start it and run it up. At a certain rpm the clutch slowly engages spinning the rotors. The rotors have high inertia and acts as a 'flywheel' on the turbine. This steadies the rpm fluctuation on the turbine with sudden increased load.
- Mon Mar 01, 2021 8:54 am
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
Re: Bell UH-1
Wrestling with the turbine rpm's at the moment...
Question.... the rotor clutch, does it disengage at over speed ?
Question.... the rotor clutch, does it disengage at over speed ?
- Sun Feb 28, 2021 7:15 pm
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
Re: Bell UH-1
I don't understand the people that criticise my methods, saying your flight model doesn't do this that or the other.... They never say, unlike this flight model which does. I asked do other flight models do that..... and it goes deathly quiet. I remember Alan telling everyone how I couldn't model bi...
- Sun Feb 28, 2021 12:10 pm
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
Re: Bell UH-1
In the flight control system file within the 'Flight' channel If you change the code to this <scheduled_gain> <input>T4T/one</input> <table> <independentVar>fcs/collective-cmd-pos</independentVar> <tableData> -0.6 -5.3 0.6 6.2 </tableData> </table> <output>propulsion/engine[0]/blade-angle</output> <...
- Sun Feb 28, 2021 11:47 am
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
Re: Bell UH-1
I know you do...
There is no P gain... It's a lot more complex than that, I'm going to have to rewrite the turbine controls
There is no P gain... It's a lot more complex than that, I'm going to have to rewrite the turbine controls
- Sun Feb 28, 2021 9:37 am
- Forum: Aircraft Development
- Topic: Bell UH-1
- Replies: 218
- Views: 107028
Re: Bell UH-1
4- a. You said the turbine model is ok. Yes, the rpm stay still. But when you collective up very fast, rpm will drop dramatically at a moment. b. RPM oscillates around %1 all the time. I understand English is not your first language and at first I didn't understand what you were after here... I've ...