Message-ID: <00f101bfa3c4$d9410de0$0464a8c0@station4>
From: "John Barrett" <2thman@olympus.net>
To: "Lancair Mail List" <lancair.list@olsusa.com>
Subject: re: IV-P Hydraulics
Date: Tue, 11 Apr 2000 07:43:08 -0700
Mime-Version: 1.0

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>Our new Florida friends plan to relocate the hydraulic pump and resevior
>forward to the left side of the fuselage, opposite the accumulator on the
>right side. This idea is appealing to us as it moves considerable weight
>about two feet forward, shortens the run of hydraulic lines and provides
>limited access and servicing through the gear door without removing panels.
>Main disadvantage is that it occupies the left side of the forward "bucket"
>of the luggage compartment--a space my wife already refers to as "useless
as
>a hat rack." I figure she won't notice the difference anyway!

I agree that you'd move C of G forward a bit with this scheme, but that
luggage box is already miniscule and you'll be compounding the problem.
Consider instead, using SLA (Recombinant Gas) batteries - placing two 17 AH
ones in the engine compartment.  At 26 pounds for the two vs a bit more for
a wet cell battery behind the baggage compartment, you get a much greater
return on moving the C of G forward plus you save a little bit of weight
overall AND you don't give up any precious baggage space.  I didn't mention
that 20 to 30 feet of #2 battery cable weighs a good bit more than two to
four feet of it and has considerably greater internal resistance.

I don't think running the hydraulics another 2 ft aft is a significant
penalty.

My $.02   -   best of luck with your project.

Regards,

Dr. John Barrett, CEO
Barrett/Garrett Enterprises
PO  Box 428
Pt. Hadlock, WA 98339
360 385 1000

"CARBINGE - The world hinges on us!"


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