Giant Scale New weight limits

Giant Scale New weight limits

Post by Pé Reiver » Fri, 04 Sep 1998 04:00:00



Hi group,

Fodder for insurance attorneys,

In all answers to this posting I missed a very important factor. Design!
most people who like to fly big airplanes have moved up the weight ladder
by experience, not necessarily design background and knowledge of all the
physics involved.
Just for that reason it is not safe to mess with the larger weights. After
all, when a weight limit is not accepted now, it will not be then! Design
dexterity means to get the most out of your limitations, which does not mean
to build to the limit, but to design and build within the limits, which are
such, that airplane construction engineering grades and homologation
programs are not required for our designs.
As weight and sizes go up, so do wing loading, take off and landing speed.
Next we will need larger flying fields to fly our no longer model- or scale,
but mini airplanes.
For the smaller sizes, Mv^2 of course is a major issue too. We should all be
aware that a turbine powered plane of 10 lbs. flying at 180 Mph is like a
cannon shot when a major control servo goes astray.Even the best pilot will
be out on a limb if this ever happens during a low pass at a show event.
Over here in the Netherlands, my private hobby shop owner builds the very
powerful and reliable ATM turbines and he is a very good flyer. I sure hope
he will never experience a glitch that will cause harm to anyone.

The point I am trying to make, is that unless we are aware of what we really
do, our actions may backfire on us in a way we might very well be sorry
about.
Response appreciated,

happy landings,

P
    Jeff Harter heeft geschreven in bericht

    IGMA and SFA announce new weight limit of 75 pounds For everyone with
SFA insurance.  Also SFA has new rates.

    Check it out at:  http://modelaviation.com/

    LIFE IS GOOD!!!!
    Jeff Harter IGMA no. 1

 
 
 

Giant Scale New weight limits

Post by Jon Barnar » Sat, 05 Sep 1998 04:00:00




Quote:
> Hi group,

> Fodder for insurance attorneys,

Sorry,

weight limits alone do not affect wing loading, landing speed, etc.,and
etc.!

These functions are well tested in the real world. For example:
Grumman F-16, weight = 21,585 lbs wing loading 87 lb sq. ft. vs Mosler N-3
Pup, weight = 535 lbs, 4.35 lb sq. ft. wing loading vs Lockheed C-5, weight
= 374,000 wing loading = 60.32 lb sq. ft. Now imagine if you built a 6,200
sq. ft wing of the C-5 of balsa...

And so on.

I would have expected everyone to know...
DESIGN IS SO, SO MUCH MORE THAN WEIGHT!
.

 
 
 

Giant Scale New weight limits

Post by Pé Reiver » Fri, 11 Sep 1998 04:00:00


I am glad, someone agrees  :-)

happy landings,
P


Quote:



>> Hi group,

>> Fodder for insurance attorneys,

>Sorry,

>weight limits alone do not affect wing loading, landing speed, etc.,and
>etc.!
snip!
>DESIGN IS SO, SO MUCH MORE THAN WEIGHT!
>.