From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: 320: negative Flaps, current for starting / battery
To: lml
Date: Sun, 15 Sep 2002 12:16:58 -0400
Message-ID: <web-1733783@logan.com>
In-Reply-To: <GEEHKBILLLPFCNKDBNHNKEANCHAA.saneke@profimail.de>
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Posted for "Bernhard Saneke" <saneke@profimail.de>:
I just sold my 235 that gave me so much fun and bought a flying 320!
On my first flight with the 320 I had a hard landing without any damage but
I am in the process to get a solution why it happend. I think that the flaps
are the problem as they are adjusted to be in neutral position (trailing
edge of the flaps is at same level as fuselage  / nomal airfoil contour) if
they are in the most upward position! That means that they travel 42 degrees
downward. In my opinion and compared to the 235 this is wrong. With the 235
flaps in most upward position ment negative flaps of 7 degrees up, and vice
versa that means that downward travel is 35 degrees, which is producing much
less drag. In my opinion the down flaps at 42 Degrees produced too much drag
and almost destroyed any lift. And that is what happend on my first landing:
approaching with about 95 mph I pulled back the throttle and the aircraft
stopped flying almost immediately. (It just fell down) Discussing this with
the preowner, he states that according to the blueprints the flaps are
adjusted correctly, that means that negative flaps means flaps in neutral
airfoil position (trailing edge of the flaps is at same level as fuselage)
What is the right answer now? In my opinion the wing of the 320 is the same
as for the 235. So negative flaps means really negative! (up from neutral)
That means that correct down position is 35 degrees from neutral which
produces lift and drag (42 degrees down seem so produce only drag, but
little to no lift)

Second question:
the 320 has the battery placed directly behing right seat, which gives  the
aircraft rear center of gravity positions which makes the aircraft very
unstable (there are so many reports about this fact in the internet). I want
to move the battery forward of the firewall but have very little space
there, so I am afraid to be able to find a battery that fits in there. (most
of the room between motor and firewall is occupied by the mufflers that are
mandytory in Germany.)
My question is: what is the least size for the battery. Is a 32 Ah nattery
sufficient? what about 24 Ah? I have an IO 320 engine, full IFR panel and
electrical gyros. What is the highest current in ampere the battery has to
supply to start the engine?

Thanks for your answers!

Regards, Bernhard, D-ESTL, Germany