INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

UAV Belly Landing Loads?

UAV Belly Landing Loads?

(OP)
I'm a student working on designing a UAV and I'm currently working on figuring out preliminary estimates for most structural loads. I'm looking for reference for the load factors experienced by UAVs designed to belly land.

Examples of UAVs that belly land are the Lockheed Martin Stalker, and the Thales Spy'Ranger. I'm ignoring UAVs where the airframe is designed to separate on impact such as the RQ-11 Raven since I'm not expecting mine to do that.

Referencing another forum thread (http://www.eng-tips.com/viewthread.cfm?qid=367609), 16G is one design value for hard landings. The load factor may be from 20-40Gs on a crash. However, this thread assumes the UAVs has landing gears.

In the case of belly landing UAVs, what are common design landing load factors?

RE: UAV Belly Landing Loads?

(OP)
Well, I've only heard of the term belly landing being used in reference to fixed wing aircraft. But yes, it is fixed wing as are the Stalker and Spu'Rangers.

Let's say the landing is on dirt (soft at it's best and packed at it's worst).

For the Spy'Ranger , referring to time 1:07 in the video https://www.youtube.com/watch?v=lZGyva_2pIk, the UAV is seen landing on it's belly in dirt.

I'm interested in the loads in such a landing.

RE: UAV Belly Landing Loads?

If you are designing a UAV with no landing gear , You would do well to research old gliders , which used a drop off dolly for take off and landed on a skid ,or reinforced belly.
B.E.

You are judged not by what you know, but by what you can do.

RE: UAV Belly Landing Loads?

WK95...

Hmmmmmmm... similarities to seaplanes and water-landings...?

MIL-A-8864 AIRPLANE STRENGTH AND RIGIDITY - WATER AND HANDLING LOADS FOR SEAPLANES

SAE/TP 2011-01-2696 Seaplane Conceptual Design

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

RE: UAV Belly Landing Loads?

(OP)
Hmm. That's an interesting way to look at things. Thanks for the suggestion.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close