Oh, and Jim, what grease did you use on your flight controls in your cockpit
module???
Tony,
Just elevate the stock shoulder harness attachment above your
shoulders. Actually I threw away the Europa units. I purchased a set of
Hooker Harness for both sides. I preferred the military style hook up
for obvious safety and extraction reasons. This is an airplane, not a
car. I also moved the shoulder harness attachment to the top of the
airframe. This stops the compression of the spine in a sudden vertical
or forward motion. With the original mounting, you will have a serious
problem with vertical compression in a vertical and forward motion of the
airframe in a crash situation. If you look at the movement of your body
in a crash, you will move forward but will be restrained by the lap seat
belt and the shoulder harness. With the restraining of forward motion
using the shoulder harness, you will be forced downward because of the
geometry of the stock mounting position (below the shoulder). Also, I
sit in a seat that positions the body in a semi-reclined position. Thus,
a very small possibility of needing the 5th point. Also, you need to
keep the harness snug because you are positioned very close to the top,
thus you need to keep attached snuggly to the airframe. I've already
bumped my head during mild turbulence. You get very used to the snugness
of the belt and begin to prefer it over the other style.
Just my opinion but I'm getting to be an old, and not bold,
pilot. Just my rantings, but with 20 + years flying helicopters, I've
found a few truths in crashing (seven times). Don't want to do it in an
airframe which must be kept moving forward to remain airborn. Thank
goodness for our slow stall speed and the design of the forward lower
fuselage. BTW the upward sloping portion of the fuselage in the footwell
area is very good. A 90 degree position of the firewall to the bottom
will dig in as you try to stop thus increasing the deceleration forces
higher than you want. The slooping area lets you slide on with out
digging in. We really have a pretty good design. But nothing is
perfect. The shoulder harness mounting area is not good in my opinion.
Just raise it about 3 to 4 inches.
Jim Nelson
N15JN
<tonyrenshaw@ozemail.com.au> writes:
> <tonyrenshaw@ozemail.com.au>
>
> Gidday,
> I am working on my cockpit module and am wondering about a 5 point
> harness.
> I know some may think this overkill, but I fly an a/c now that only
> has a 4
> point, and there is a natural tendency as your shoulder harness
> tightens
> under load for your lapstrap to ride up above your hips. To achieve
> a safe
> outcome your lapstrap would have to be uncomfortably tight always.
> So, the
> problem arises in an impact where your abdomen is exposed to forces
> supposed to be contained by your lapstrap, but they aren't. So, I
> want to
> know if anyone has fitted a crutch strap and if so where it was
> mounted,
> either on the vertical face of the thigh support, or was it
> accomodated in
> the first 4-6" of the front portion of the thigh support on the seat
> long
> axis, or where? Any quick advice would be kindly appreciated.
> Reg
> Tony Renshaw
> Sydney Australia
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