Hinge Moments of Sealed-Internal-Balance Arrangements for Control Surfaces. 1 - Theoretical Investigation
Abstract
The results of a theoretical analysis of the hinge-moment characteristics of various sealed-internal-balance arrangements for control surfaces are presented. The analysis considered overhands sealed to various types of wing structure by flexible seals spanning gaps of various widths or sealed to the wing structure by a flexible system of linked plates. Leakage was not considered; the seal was assumed to extend the full spanwise length of the control surface. The effect of the developed width of the flexible seal and of the geometry of the structure to which the seal was anchored was investigated, as well as the effect of the gap width that is sealed. The results of the investigation indicated that the most nearly linear control-surface hinge-moment characteristics can probably be obtained from a flexible seal over a narrow gap (about 0.1 of the overhand chord), which is so installed that the motion of the seal is restricted to a region behind the point of attachment of the seal to the wing structure. Control-surface hinge moments that tend to be high at large deflections and low or over-balanced at small deflections will result if a very narrow seal is used.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1945
- Accession Number
- ADA801569
Entities
People
- Harry E. Murray
- Mary A. Erwin
Organizations
- National Advisory Committee for Aeronautics