Accession Number:

ADA030173

Title:

Automated Procedure for Evaluating Sites for Suitability as Helicopter Landing Zones. Volume 1. Descriptions and Instructions for Use of Computer Programs

Descriptive Note:

Final rept. Jan 1973-Jun 1975

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s):

Report Date:

1976-06-01

Pagination or Media Count:

282.0

Abstract:

This report contains instructions for operating a model that is an automated procedure for evaluating designated sites as helicopter landing zones. The model is comprised of three independent computer programs run sequentially. Program 1 FTHEL evaluates the site in terms of generalized conditions of slope, microrelief, and soil strength as related to the requirements set by certain characteristics of the helicopter that is to land. The program determines whether the site can provide a full-touch zone, a skid-touch zone, a nontouch zone, or no landing zone at all, and computes the minimum departure angle for the specified helicopter if a landing zone is possible. Program 2 FTJPRH is an automated mathematical procedure for predicting the size and shape of a clearing in a forested area by considering blast forces from a bomb explosion, tree stem strength, stem diameter, and distance from ground zero GZ , the center of the explosion. The clearing is described by a vegetation profile of tree remnant height versus the distance from GZ. Program 3 FTJPHL of the model is an automated procedure for evaluating a clearing by estimating how many trees must be removed from a clearing produced by a high-yield, air-dropped munition in order to use the clearing as a full-touch helicopter landing zone. The output is the number of tree remnants that must be removed to satisfy the landing requirements of a specified helicopter.

Subject Categories:

  • Terminal Flight Facilities
  • Computer Programming and Software
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE