|
Hi, Jim....yes, that is correct....I turned on the
other pump, but since the prop had already stopped and there was no input to the
ECU that spark existed, the fuel pump relay would not turn the pump on anyway. I
did not hit the starter button, as I was in a perfect position to turn base, and
just decided to go with rule number one....Fly the airplane. No need to
trouble shoot when you are perfectly set up for a landing. That's what the
hangar is for. If I were at altitude, I would have tried to restart and
replace the fuse, but since I was in the pattern, not an option. Paul
Conner
----- Original Message -----
Sent: Monday, May 02, 2005 8:50 AM
Subject: [FlyRotary] Re: Ed's new rotor
housings
Chris,
I don't believe anyone's arguing that as far as it
goes. As I read it, the issue turns on what size fuse / breaker you are
using. If the circuit is protected close to the rated draw of the
component, then transients could trip it and it could be successfully
reset. If the fuse / breaker is sized way above the rated draw of the
component, transients are not going to happen and the fuse/breaker will
blow/trip just in time to prevent the wire from melting down - long after
the component is fried.
The basic issue (for me) is that in
this scenario, breakers are heavy, expensive, complex (like it or not, they do
constitute a failure mode), take up panel space but serve no real
purpose. I'm not against breakers for avionics and the like where you
want to protect a delicate, expensive device from damage from transients, but
if Paul had a heavier fuse (or breaker), his pump never would have quit in the
first place. One could argue that if he'd had a CB, he might not have
had time to trouble shoot his situation and reset it. As it was, he was
real busy staying out of the trees, and IIRC he did turn on the other pump
(probably took less time than trouble shooting and reseting a breaker) but it
was already too late for that to keep the engine running. Paul - is that
right?
On the one hand, I don't want a flight critical component
putting me in the trees on account of some hokey transient, and on the other
hand, transients can't destroy a component as robust as a fuel pump.
That's my basic reasoning.
It's a philosophical position ... I'll
change it for a good enough reason ... Jim S.
Christopher Barber
wrote:
If'n I am not mistaken they are saying a cb MAY reset (due to an
intermittent problem or other anomaly).....a fuse WILL NOT. If I have
a choice between MAY and will NOT, I think I will chose MAY......even if the
cb reset may point to another problem that must be tended to after a safe
landing. I do not want to stand on principles of what SHOULD
be happening if there is an option to get back to Teran soil
safely.
But what do I know, I am not even staying at a Holiday Inn
Express.
All the best,
Chris
\-----Original
Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Al Gietzen
Sent: Monday, May 02, 2005 1:17
AM
To: Rotary motors in aircraft
Subject: [FlyRotary]
Re: Ed's new rotor housings
I hate to stir the pot
again, but using fuses instead of circuit brakers is asking for dead
stick landings.
The fuse
blew because of a wiring problem; Reset the breaker and it either
won’t reset, or it will trip again. How does that
help?
Al
-------Original
Message-------
Subject:
[FlyRotary] Re: Ed's new rotor
housings
> Climbed like a
rocketship and temps never went above 165 until the engine
quit.
Congrats on
the glider time, Paul!
My
understanding is that the pumps, at least the ones I'm using (or at
least WAS using when I used to be able to fly this #@#$ing thing, long ago), are designed to
run continuously. I have one Walbro Inline fuel pump-GSL393 (from
Tracy) and one
Walbro Inline fuel pump-GSL394 from Lightning Motorsports. Both
have metal screw in connectors which fit AN adapters. They're fused
at 20 amps.
|
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.11.1 - Release Date: 5/2/2005
|