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Angier,
Back when I was building, Don Goetz visited my hanger at Spruce Creek, Fl (during Sun-N-Fun) to take at look at a wing skin issue. This was on a 360 and he made the general comment that anything (weight) that could be moved forward during construction would benefit the "envelope". Having read all the nightmare stories about access to the hydraulic back installation (factory setup), I decided to install my hydraulic back on the fire wall (hot side). This was done (easy access) and the only downside observed is that on a hot summer day (Florida!!!!!), I see about a 300psi increase on hydraulic pressure (gets to about 1900 psi) on my cockpit guages. I also noted that many of the RVs (various types with over 50 on the field) have installed their batteries on the hot side of the fire wall. There are various configurations (boxes, no boxes, blast tube cooling, etc). I also went this route with a metal shield around the sides (open on top and bottom) with reflective insulation on the sides. No bast tubes or specialized cooling of any type were used for the battery or hydraulic pack. I replaced my Odyssey 680 after six years and am two years into a new one. The first battery still tests fine while sitting under my work bench. It appears that heat issues forward of the fire wall on my installation have never been a problem. There was a hydraulic back issue that Chris Z. helped fix that involved the factory settings but since that time everything is fine. The only issue in thinking back is planing the fire wall positions and yes it is very congested (even with the long mount) but access is ideal. My bird has 400 hours at this point.
Mark Quinn
mquinns@aol.com
-----Original Message-----
From: Greenbacks, UnLtd. <n4zq@verizon.net>
To: Valin & Allyson Thorn <thorn@starflight.aero>
Cc: Ralph Love <ralphlove@stanfordalumni.org>; List Lancair Mailing <lml@lancaironline.net>
Sent: Mon, Oct 21, 2013 11:07 pm
Subject: [LML] Re: Odyssey PC680 Batteries on Firewall -- Cool Enough?
OK, there is no good reason to have the weight of the pump, relays, wiring and
hydraulic plumbing that far aft.
This is not original thinking on my part, just common sense and following the
advice of other builders who blazed this trail before me.
I don't know about the Legacy, but 235, 320 and 360 generally need help in the
aft CG department.
Just for giggles, try servicing the pump and related systems located aft of the
baggage compartment.
It's not a pretty picture.
You'll need to employ the services of a midget gerbil with superior digital
dexterity.
Even if you don't have an aft CG issue, you will need to remove the pump and or
relays some day.
I went through 3 relays and 2 emergency gear extensions in the first ten hours
before correctly installing diodes on the relays.
Without the pump and relays behind the seat it would have been a major pain to
trouble shoot and repair.
While on the subject of aft CG and at the risk of starting yet another food
fight, I added a lot of unnecessary (in my humble opinion) weight
to my rudder in an attempt to achieve 100ยบ mass balance. I suspect my CG could
have been an inch further forward without all that
extra lead in the rudder. Nevertheless, I have excellent elevator trim
throughout the entire speed envelope.
Angier Ames
N4ZQ
74hrs
On Oct 21, 2013, at 6:13 PM, Valin & Allyson Thorn wrote:
> Hi Angier,
>
> Please let me know your arguments for mounting the hydraulic pump directly
behind the seat. Really appreciate your expertise.
>
> Ralph was interested in this too, so copying him.
>
> Thanks,
>
> Allyson
>
>> On Oct 21, 2013, at 1:30 PM, "Greenbacks, UnLtd." <N4ZQ@VERIZON.NET> wrote:
>>
>> Hi Valin,
>>
>> Move your hydraulic pump from its current location.
>> Create a small bulkhead and put the pump directly behind your seat.
>> The reasons are too numerous to list!
>> Don't even think twice about making this change.
>> Equally important, locate your pump breaker within easy reach on your panel.
>>
>> Angier Ames
>> N4ZQ
>> 69hrs
>>
>> --
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