Archived from groups: alt.games.microsoft.flight-sim (
More info?)
"Scott Zane" <whatsit@to.you> schrieb im Newsbeitrag
news:Xns96044F3F9286Bscottzaneverizonnet@216.196.97.131...
> "Oskar Wagner" <rengaw@swissonline.ch> wrote in
> news:cvcj2h$a5i$1@news.hispeed.ch:
>
>>> Known as the "Whisper Jet". I think I read somewhere that the engines
>>> are the ones also used in the Apache helicopter. I might be wrong
>>> (and I'm sure someone will tell me!) :0))
>>>
>>> Iain
>>>
>> Yes, the engines are derived from a helicopter power plant. That's one
>> of it's main disadvantages. They are not turbofans but rather geared
>> fans which means that the front fan is driven through a gearbox. This
>> in turn causes more trouble and higher operating costs as due to the
>> gearbox engine cycles are quite limited compared to a "normal"
>> turbofan where most of the engine maintenance/overhaul cand be done
>> "on condition" (without removing the engine from the A/C).
>
> What engine is this? The only jet engines I know of that have a gearbox
> "in
> the fans" is actually a turboprop engine (turbojet engine that drives a
> propeller through a reduction gearbox).
>
> Are you saying there is a turbofan engine out there that uses a gearbox
> between either the compressor blades and the fan blades or the turbine
> section and the fan blades to, I suppose, increase the speed of the fan
> blades alone and thus increase flow of bypass air to the exhaust stream?
it's a Avco-Lycoming ALF502R-5. (Nowadays an AlliedSignal-Honeywell
Company). Unfortunately I couldn't find a cutaway picture of this quite
unique turbine. As I remember it's a funny combination of axial and
centrifugal turbine and gearbox. Maybe somebody else can provide something?
--
Oskar
(retired captain)
Remember, in the great scheme of things, we're all small potatoes...