"Dudley Henriques" wrote in message
...
tman wrote:
Flown C172's for quite a while, and never had anybody in the back.
Now I'm planning on quite a trip, with 2 pax and luggage.

When I fill the fuel to the *tabs*, calc everyone's weight honestly and
consider baggage -- I'm 75 lbs over the 2450 gross on departure. Maybe
100 over gross if I assume a "lie about weight" factor or some inaccuracy
with filling the tanks. Now I'm scratching my head about just how risky
this is. I know (others) have pushed over gross in these planes way more
under worse conditions, and have almost always gotten away with it. I'm
inclined to just do it, and be cognizant that it will perform
differently, i.e. don't expect the same picture on climbout that you
would when solo.

Risky? Or just roundoff error on the weight? Here are some other
factors:

This is the 160HP C172, standard.
Departure runway is 5000'.
No steep terrain to climb out of.
Plenty of alternates along with the way with 3000 runways.
Not particularly hot, humid, or high. 50 degrees at 1000 MSL for
departure or any point of landing.

I'm figuring I'm 3% over gross, causing most of my V speeds to increase
1.5%, so say -- instead of flying short final at 65 knots, I'd fly at 66
knots... OK wait I can't hold airspeed to +/- 1 knot on most days
anyways.

I'm thinking through many of the factors, and it is only a "little" over
gross, only on the first hour or so of the trip. What else should I be
aware of? Am I dangerous?

T

I never advise a pilot to load any airplane over gross.
I will tell you that the big killer in these situations is the cg
location, especially the aft cg.
Tell you what; instead of my "advising you" on what to do specifically
with this flight, let me suggest to you that you run a weight and balance
for this aircraft at full tanks, THEN run the same pax and baggage loading
figuring 1/4 tanks, just to see what this does to the cg.


--
Dudley Henriques

Making a Tail Skidder out of a 172 even a 182 when the pilot gets out is
fun!!!! 30% over gross Extreme Aft CG Utterly Priceless and FUN!!! But all
in a days work.

Here is a sample for a PA28...
http://aircraftdelivery.net/ferrypil...nkedpermit.pdf

Will scan in a 172 and 182 when I have time...

Don't fly over Gross unless approved to do so and have been instructed on
techniques you can end up a wet stain on the ground.