Today's Message Index:
----------------------
1. 04:06 AM - Re: Web spar ()
2. 03:48 PM - Re: aux fuel tanks (Kip and Beth Gardner)
3. 07:41 PM - Re: aux fuel tanks (Rcaprd@aol.com)
4. 09:27 PM - operation manual (Richard Navratil)
5. 11:32 PM - Re: operation manual (DJ Vegh)
Message 1
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--> Pietenpol-List message posted by: <gcardinal@mn.rr.com>
Dick,
I can't help you with a "proven and flying" example but I do have an article
from an early Sport Aviation issue that deals with designing a plywood
webbed spar.
I don't have a scanner but if you, or anyone else, wants a copy just
send a stamped, self-addressed envelope to me and I'll mail a copy.
Greg Cardinal
5236 Shoreview Ave.
Minneapolis, MN 55417
----- Original Message -----
From: "Richard Carden" <flywrite@erols.com>
Subject: Pietenpol-List: Web spar
> --> Pietenpol-List message posted by: Richard Carden <flywrite@erols.com>
>
> Pieters:
>
> I'm thinking about making my wing spars from plywood with cap strips.
>
> Does anyone know of a PROVEN design . . . that is one that has been
> built and is actually flying?
>
> I'd appreciate any referrals.
>
> Many thanks,
> Dick Carden
>
>
Message 2
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Subject: | Re: aux fuel tanks |
At 2:10 AM -0500 3/26/04, BARNSTMR@aol.com wrote:
>There's two aspects of safety.
>1) Airworthiness
>2) Crashworthiness
>
>If you optimize the design for #1, then you minimize the probability
>of #2 being a factor. Chuck's point is that the simple gravity flow
>system is more airworthy than the other design, i.e. the liklihood
>of engine failure due to fuel starvation is minimal. The more
>complicated system with fuel pumps, etc increases the liklihood of
>fuel starvation, thus decreasing the airworthiness. Yeah, it is
>more crash worthy... but do we consider that safe? And who really
>wants to go do that test?
>
>I think that if more folks designed from the "airworthiness" point
>of view, there would be far fewer homebuilt airplane accidents.
>
>Thats my $ .02.
>
>Terry B
In this vein, I've noted before that WmWynne had a center section
tank that he made by glassing in most of it. This tank had about 20
gal. capacity & it did not rupture in the crash that destroyed his
Piet. As he has mentioned several times, he believes that there would
not have been a fire if he had put check valves on his tank outlets
that would have stopped fuel flow when the lines sheared off in the
crash.
All this sounds both airworthy and simple to me, and 20 gal. gives
adequate flight time at Corvair burn rates. Also, allows you to use
the forward section for baggage & then there are no shifting w&B
issues to deal with, as many people have mentioned happens when you
burn off gas in a nose tank.
That's my $.02 :).
Kip Gardner
--
North Canton, OH
Message 3
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Subject: | Re: aux fuel tanks |
--> Pietenpol-List message posted by: Rcaprd@aol.com
In a message dated 3/26/04 5:49:08 PM Central Standard Time,
kipandbeth@earthlink.net writes:
<< As he has mentioned several times, he believes that there would
not have been a fire if he had put check valves on his tank outlets
that would have stopped fuel flow when the lines sheared off in the
crash. >>
Kip,
This is a 'Crashworthy Device'. I've heard of this type of check valve,
but haven't seen any in use. I believe it's design is a delicate balance
between the fuel flow needed for sustained full power oporation, and the increased
fuel flow of a ruptured line. If the valve fails during service, it could
starve the engine for fuel. If the valve fails at the crash site, it would
still allow fuel to flow, especially if it is just a cracked line or fitting,
allowing just a small quantity of fuel to flow. Or, if the craft came to rest
in
an attitude that doesn't allow full fuel flow. Personally, I don't like this
type of valve, and wouldn't use it.
The best design would be to use one outlet, and one good quality ball
valve, mounted right to the bottom of the wing tank (above the passengers head),
actuated via a torque tube back to the pilot seat. Emergency check list would
include turning the fuel off.
Chuck Gantzer
NX770CG
Message 4
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Subject: | operation manual |
For anyone who is interested, I have completed a base Operation Manual for the Piet. I have deleted most of the Pictures for my manual but the file still comes to about 1.5 mb. Too large to post so if anyone wants to copy it respond direct at www.horzpool@goldengate.net and I will send it out. It run about 22 pages.
Dick N.
Message 5
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Subject: | Re: operation manual |
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