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Re: [OM] Typhoon

Subject: Re: [OM] Typhoon
From: ChrisB <ftog@xxxxxxxxxxxxxx>
Date: Fri, 26 Sep 2014 19:39:01 +0100
It’s a clever system.  The constant speed prop on a piston-engined aircraft 
works on similar principles: by maintaining a constant RPM as the speed 
increases the propellor’s angle of incidence is increased to maintain the same 
effective angle of attack.  Without this system the thrust would decrease with 
the increase in IAS – which is what happens with fixed-pitch props.

Chris

On 26 Sep 2014, at 16:01, Chris Trask <christrask@xxxxxxxxxxxxx> wrote:

> 
>     The C-130 has a somewhat similar arrangement, at least on the -15 
> (H-model) and earlier engines.  There is a "ground" range where you are 
> controlling the pitch of the propeller(s).  Then there is a "temperature 
> controlling" flight range where you are controlling the TIT (turbine inlet 
> temperature" of the engine(s).  And finally there is the "temperature 
> limiting" range, wher you are basically controlling the fuel rate and the 
> engine controller is adjusting the rate so as to limit the TIT.  As your 
> airspeed increases, the prop pitch is adjusted to maintain a very limited RPM 
> range and the fuel rate is adjusted for more power.

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