Question from a helicopter pilot. .

[boing]

Hello everyone

At the risk of generating more vitriol, I am still struggling with this and I have managed to get more information from the Manufacturer. Can anyone (Moderator?) tell me how to add attachments? A proper Scientific solution to the everyday problem would be great.

Thanks in advance.

Boing

 

[Topher925]

Under the "Additional Options" section when you make a post, there is a button called "Manage Attachments". Click it and the rest is self explanatory.

In order to give you a good answer we will need the following:

1. geometry of the cabin
2. mass of the payload
3. geometry of the straps
4. tension in the straps
5. geometry of the load

This is only to determine the stress placed on the aircraft cabin. In order to determine if it is safe, well that's a much bigger problem.

 

[nucleus]

There is information on this in AC 43.13-1B Chapter 12. Available at
http://rgl.faa.gov/Regulatory_and_G...cular.nsf/0/E533BB05389C90E486256A54006E47B2?

If you cannot determine what the strength the strength of fittings provided by the manufacture you will have to do a test as outlined in the AC. An AC is not law but it is a good place to start if there is nothing in your structural manual.

It does not appear to me that you are familiar with this subject. There are many rules, such all material to be fire resistance, that apply. Personally I would recommend you obtain the services of an engineer familiar with it, otherwise you are leaving yourself open to legal suits.

 

[Gear300]

If the freight experiences 4g of acceleration, then the force is 4gm. The component of tension perpendicular to the floor along the straps is actually in the opposite direction of the force the freight exerts on the floor and should sum up to 4gm (as a vector component). The tension will also have a horizontal component. You'll have to take into account the friction with the floor, the direction of flight, and the angle of elevation for this. The horizontal force will exert, I'm thinking, shear stress, which you can cover up with good flooring. For a better answer, you might want to ask in the engineering thread.