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Jetranger Governer RPM Switch  
User currently offlineCosync From Mexico, joined Nov 2001, 556 posts, RR: 0
Posted (12 years 1 month 1 week 11 hours ago) and read 1834 times:

what does the governer RPM switch do? i know how the collective works and stuff but just dont understnad that switch?

8 replies: All unread, jump to last
 
User currently offlineNotar520AC From United States of America, joined Jul 2001, 1606 posts, RR: 4
Reply 1, posted (12 years 1 month 1 week 10 hours ago) and read 1808 times:

I have never used the thing in any helicopter, but I from playing with it in the sim it looks like it just inches the main rotor RPM up and down in small incraments. Gee- you guys have a lot of questions I'm gonna have to ask my instructor!


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User currently offlineCosync From Mexico, joined Nov 2001, 556 posts, RR: 0
Reply 2, posted (12 years 1 month 1 week 3 hours ago) and read 1803 times:

well u know what i dont understand.
i dont undersand how the rotor RPM and the engine RPM can be diferent. there both the one shaft. like the 2 needles on the rpm gauge is what im talking about.


User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 3, posted (12 years 1 month 6 days 5 hours ago) and read 1798 times:

The RR Allison 250 is a double-spool engine so the second (engine) RPM is probably the core (high pressure compressor/turbine) RPM.

Cheers,
Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineCosync From Mexico, joined Nov 2001, 556 posts, RR: 0
Reply 4, posted (12 years 1 month 6 days 5 hours ago) and read 1794 times:

oh ok thats where my knowledge stops. no idea what double spool means

User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 5, posted (12 years 1 month 6 days 4 hours ago) and read 1795 times:

Time to hit some jet engine literature then!  Smile

In a single spool turboshaft engine, the compressor, driveshaft and turbine are all on one axle. In a dual spool, the low pressure compressor, low pressure turbine and driveshaft share one axle while the high pressure turbine and high pressure compressor are on a second one.

Cheers,
Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineCosync From Mexico, joined Nov 2001, 556 posts, RR: 0
Reply 6, posted (12 years 1 month 6 days 4 hours ago) and read 1793 times:

ahhh i see. pretty simple. so thats what the 2 needles are. so in a robinson R22 there would only be one needle.

User currently offlineFredT From United Kingdom, joined Feb 2002, 2185 posts, RR: 26
Reply 7, posted (12 years 1 month 6 days 2 hours ago) and read 1794 times:

Well, unless you have a separate indication since the engine isn't connected to the rotor at all times. Then there's manifold pressure or whatever they use to set the power...  Smile

Cheers,
Fred



I thought I was doing good trying to avoid those airport hotels... and look at me now.
User currently offlineUps763 From United States of America, joined Nov 2001, 199 posts, RR: 0
Reply 8, posted (12 years 4 weeks 1 day 15 hours ago) and read 1788 times:

Cosync,
In the R22 there are two needles, Engine and Rotor tach. In normal flight they should be joined at all times and operate at 97-104%. When practicing autos, throttle chops, etc., the trottle is complettley rollled of until you flare. So the needles are not joined during those procedures. When the engine and rotor are not joined the rotor speed has a range of 90%-110%. Anything below 80% your blades stall and thats all she wrote.

Matt


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