Green Arc Red Zone

Morgans wrote
So, fixing the mounts and stiffening the wings was the only thing that
was changed; no different operating procedures?

The "old" Electras that I flew at Air Florida did have a speed limit
imposed by the FAA. I have forgotten just what it was...34 years ago.

Bob Moore

Bob Moore wrote:


The Electra (L-188) engine (Allison) always turned at 1061 RPM except at
ground idle. It had no Prop Control.

C'mon Bob, I seriously doubt the *engine* ran at 1061 RPM!

Happy Flying!
Scott Skylane

"Scott Skylane" wrote in message
...
Bob Moore wrote:


The Electra (L-188) engine (Allison) always turned at 1061 RPM except at
ground idle. It had no Prop Control.

C'mon Bob, I seriously doubt the *engine* ran at 1061 RPM!

Why not? It is a turbine engine, after all.
--
Jim in NC

Morgans wrote:

"Scott Skylane" wrote in message
...

Bob Moore wrote:


The Electra (L-188) engine (Allison) always turned at 1061 RPM except at
ground idle. It had no Prop Control.

C'mon Bob, I seriously doubt the *engine* ran at 1061 RPM!


Why not? It is a turbine engine, after all.

That would make it even more surprising. That would be extremely slow
for a turbine. It isn't bad for a large piston engine, but still on the
slow side.


Matt

"Scott Skylane" wrote in message
...
Bob Moore wrote:


The Electra (L-188) engine (Allison) always turned at 1061 RPM except at
ground idle. It had no Prop Control.

C'mon Bob, I seriously doubt the *engine* ran at 1061 RPM!

Happy Flying!
Scott Skylane

Well, the output shaft & prop did. As I remember there was about an 11:1
reduction from the turbine.

Al G

VP-48 Crew 6 Moffat/Adak/Agana

"Matt Whiting" wrote


That would make it even more surprising. That would be extremely slow for
a turbine. It isn't bad for a large piston engine, but still on the slow
side.

Note to self: remove egg from face. g

I finally saw it. I was looking at it and sseing 10,610 RPM, or something
like that.

Perhaps that is prop speed, at 1,061 RPM ?
--
Jim in NC

Morgans wrote:
"Matt Whiting" wrote


That would make it even more surprising. That would be extremely slow for
a turbine. It isn't bad for a large piston engine, but still on the slow
side.


Note to self: remove egg from face. g

I finally saw it. I was looking at it and sseing 10,610 RPM, or something
like that.

Perhaps that is prop speed, at 1,061 RPM ?

That would make a lot of sense. 1,000 RPM for a large prop would be
plenty fast.

Matt

john smith wrote:
Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me
to thinking.
What aircraft do you fly/have you flown/do you have first hand knowledge
of which have a red zone somewhere in the green arc of the tachometer?

For example, I know there are/were certain models of Cessna 210's that
had such markings, but I cannot remember the specific models/engine/prop
combinations.


I have a modified Cessna 172 with the Lycoming O-360-A1A engine and
Hartzel prop. I have a redline limitation between 2100 and 2250 rpm.
Really stinks.

--
Regards,

Ross
C-172F 180 hp
KSWI

Although there is red marking in the green arc, the POH for the 1979
Piper Turbo Arrow IV/PA28RT-201T, the LIMITATIONS SECTION lists the
following placards:

AVOID CONTINUOUS GROUND OPERATION 1700-2100 RPM IN CROSS/TAIL WIND OVER
10 KTS.

AVOID CONTINUOUS OPERATION 2000-2200 RPM ABOVE 32" MANIFOLD PRESSURE

I believe this applies to the two-bladed prop only and not the
three-bladed prop, but I can find nothing in the manual to support this
theory. I do not find the placards on the panel of the aircraft I fly
which has the three-bladed prop.

These two lines in the LIMITATIONS SECTION are the only place in the
POH which mention this condition.

Morgans wrote
Perhaps that is prop speed, at 1,061 RPM ?

Obviously.... :-)

Bob Moore