Can anyone explain the 9 degree limit with the 1320 lb STC? If you
are within
CG limits, I don't see how the extra 60 lbs play a role in 13 degrees
of elevator.
Dan Caliendo
Ercoupe Mach 0.14
3658H
On Apr 21, 2009, at 3:50 PM, Daniel Arditi wrote:
Yes Ed, I know, and I told him. I really don't know why it is like
that.
I will measure the up travel as soon as I can just to see how much
it moves upwards. I'm just telling you what he told me, but I did
not measure that.
Serial number is 4849 (Model 415-CD).
Thanks !
Daniel
From: Ed Burkhead <[email protected]>
To: Daniel Arditi <[email protected]>
Sent: Tuesday, April 21, 2009 4:44:49 PM
Subject: RE: [ercoupe-tech] RPM Drop during Climb Out
Daniel,
If the elevator up travel on an Ercoupe or Aircoupe isn’t correctly
restricted, the plane is illegal to fly. It is also unsafe to
fly. If the elevator does not have the up travel limits, the
aircraft can stall and may not be able to recover.
The airfoil used on Coupes is efficient but it has bad stall
behavior. It is only safe on a Coupe because of the elevator up
travel limits which prevent a normal stall.
The 415-C and 415-CD should have the limiter set to 13° up travel
unless you have the 1320 lb. gross weight STC in which case the
limit must be at 9° up travel.
The 415-D must be set to 9° up travel.
Any model after the “D” will have the “split” elevator (the
elevator with the cut out section in the middle). Some C, CD and D
models may have been upgraded to have this elevator. It should be
set to allow 20° of up travel (and gives about the same elevator
effect as the 415-C and CD have with 13° up travel, but with
increased saf ety ).
You haven’t yet told us what model and serial number your friend’s
plane has. That would help us help you.
Ed
From: [email protected] [mailto:ercoupe-
[email protected]] On Behalf Of Daniel Arditi
Sent: Tuesday, April 21, 2009 1:45 PM
To: [email protected]
Subject: Re: [ercoupe-tech] RPM Drop during Climb Out
Yes Ed, I agree with you.
One thing I told to my friend is that I don´t like the idea of not
having the limit in the upward elevator travel. This can allow the
coupe to climb too steep, when in combination with the the C90
engine power and low weight (fabric covered wings, not metal covered).
Thanks again for all the help and advice.
Next time, when everything seem to be OK, I would suggest my friend
not to climb so steep, at least at take of.
Daniel
From: Ed Burkhead <[email protected]>
To: Daniel Arditi <[email protected]>; ety <ercoupe-
[email protected]>
Sent: Tuesday, April 21, 2009 2:54:23 PM
Subject: RE: [ercoupe-tech] RPM Drop during Climb Out
Daniel,
As far as fuel feed to the engine during extremely steep climbs,
one could say that there’s no “limit” on how steep a climb a Coupe
can safely do.
If you try to go too steep, the fuel won’t feed, the engine will
lose power, the nose will drop and the engine will immediately
regain power. That’s pretty safe unless you’re trying desperately
to climb over trees or a mountain ridge..
There is a physical fuel-flow limit on how steeply the Coupe can
climb, though, and it’s so steep it’s very rare to encounter it.
Normally, your best climb just won’t be steep enough to have this
problem as long as your elevator up travel is rigged the way it’s
supposed to be and the center of gravity is within the allowed
limits. Come to think of it, perhaps you should double-check those
items.
I would avoid any flying situations that forced me to need that
steep of a climb.
Ed
