Citation Weirdness

Sierra Industries will update the engines on your old Cessna
Citation. Basically, they increase the allowed turbine RPM speed.
The result is that the engine produces the same thrust (2200 lbs) at
takeoff and climb as before, but more thrust (2345 lbs) at cruise. So
at climb I must keep the throttles back, but as I level off I can
advance the throttles for more thrust. When I go back to climbing, I
must reduce the thrust again.

This seems *odd* to me. Can someone please explain it?

http://www.sijet.com/CitationProducts_JT15D.aspx

-Charles Talleyrand

Perhaps the recommended climb speeds are slower than cruise speeds and that
affects the max allowable thrust levels?
Is there any info on cruise/climb speeds where you climb at cruise speed?

"Charles Talleyrand" wrote in message
ups.com...
Sierra Industries will update the engines on your old Cessna
Citation. Basically, they increase the allowed turbine RPM speed.
The result is that the engine produces the same thrust (2200 lbs) at
takeoff and climb as before, but more thrust (2345 lbs) at cruise. So
at climb I must keep the throttles back, but as I level off I can
advance the throttles for more thrust. When I go back to climbing, I
must reduce the thrust again.

This seems *odd* to me. Can someone please explain it?

http://www.sijet.com/CitationProducts_JT15D.aspx

-Charles Talleyrand

Higher thrust doesn't necessarily mean a higher throttle *position*.

On Jun 17, 11:27 pm, Charles Talleyrand wrote:
Sierra Industries will update the engines on your old Cessna
Citation. Basically, they increase the allowed turbine RPM speed.
The result is that the engine produces the same thrust (2200 lbs) at
takeoff and climb as before, but more thrust (2345 lbs) at cruise. So
at climb I must keep the throttles back, but as I level off I can
advance the throttles for more thrust. When I go back to climbing, I
must reduce the thrust again.

This seems *odd* to me. Can someone please explain it?

http://www.sijet.com/CitationProducts_JT15D.aspx

-Charles Talleyrand

As long as N1 and N2 stay in check, along with the T5 it should be
alright. As far as "Is there any info on cruise/climb speeds where
you climb at cruise speed?" really doesn't come into play in a
Citation, you're lucky enough to get what you get and keep the speed
up for some of the newest turboprops behind you.

Have a great one!



On Sun, 17 Jun 2007 23:27:36 -0700, Charles Talleyrand
wrote:

Sierra Industries will update the engines on your old Cessna
Citation. Basically, they increase the allowed turbine RPM speed.
The result is that the engine produces the same thrust (2200 lbs) at
takeoff and climb as before, but more thrust (2345 lbs) at cruise. So
at climb I must keep the throttles back, but as I level off I can
advance the throttles for more thrust. When I go back to climbing, I
must reduce the thrust again.

This seems *odd* to me. Can someone please explain it?

http://www.sijet.com/CitationProducts_JT15D.aspx

-Charles Talleyrand