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Sorry for not responding earlier, was out of town on 2 back to back trips.
<pumps drawing from different levels in the tank, like my motorcycle
does for it reserve
Let me clarify. Both of my wet pumps reside at same elevation inside a 3
gallon aluminum tank. When I run one of my wing tanks dry, the main
fuel pump will consume all of the fuel in this sump tank except for appx 1/2
gallon. The engine sputters, I fire up my aux fuel pump, and flow is immediate
to the engine. So I don't have that 9 second delay that others have. This
improves safety.
Pic and more details here:
<Yeah, you should be paying attention to fuel management but this
seems like some cheap back up
Excellent point! Build system assuming you will experience the same
failures as others have in the past.
My fuel sys addresses all of the most common, high risk failures. It
drives many risks to near zero. For example, fuel clog from debris is near
impossible to occur. Vapor lock near impossible, as the pressure drop at pump
inlet is as low as possible. Running tank dry has the least time delay to
restore fuel. Pump failures less likely, as they are cooled by fuel. It would be
cool if I invented all this, but I just copied the same design principals used
by every single car manufacturer.
-al wick
----- Original Message -----
Sent: Thursday, August 16, 2012 9:04
AM
Subject: [FlyRotary] Re: fuel pump
replaced
I am using two fuel pumps. The Aux was always quieter. Now they
sound about the same. I guess since, IIRC, the primary was
always louder I "assumed" it was normal and was just limited to the individual
pump.
I was just reviewing Al Wick's sight. He hates the rotary (ok, that may be
too strong, but he is not a fan). He is using a Subaru. I was
looking at his sump tank. He is using in the tank pumps, which I do not
wish to do as of right now. However, something he did which I
did kinda like was that he had his pumps drawing from
different levels in the tank, like my motorcycle does for it reserve.
That way, if the primary pumps runs dry, you can switch to the second pump and
have a bit more fuel....hopefully at least enough to pull your head out and
get on the ground. This seems pretty easy, especially with inline
pumps, to do and like a good idea. Seems as if you would just have
to have one pump out location higher than the other and you have a bit of a
reserve. Yeah, you should be paying attention to
fuel management but this seems like some cheap back
up. However, I could be missing something as currently I am
feeding both pumps from the same outlet. Thoughts?
Chris
From: Rotary motors in aircraft
[flyrotary@lancaironline.net] on behalf of Bill Bradburry
[bbradburry@bellsouth.net]
Sent: Thursday, August 16, 2012 10:15
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re:
fuel pump replaced
Chris,
Is there a difference
in sound between the new pump and the old one you are still using? I
think that they should both sound the same. Mine do.
Bill
B
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Chris Barber
Sent: Thursday, August 16, 2012 10:43
AM
To: Rotary motors in
aircraft
Subject: [FlyRotary]
fuel pump replaced
I replaced my
faulty fuel pump. The new pump is MUCH more quite. I suspect the
old one was on the way to failure for a while and finally when belly
up. It was really noisy. When I took it off I applied power to
both independently and the old one was just plain dead.
I hope I have
addressed the few gremlins that has kept me on the ground the last few
weeks and will get to fly later today.
FWIW.
Chris
Barber
Houston
KEFD
Velocity
SE
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