Strapped windshield assembly for rotorcraft
This description relates to a strapped windshield assembly for a rotorcraft. In some implementations, the rotorcraft includes an airframe, a windshield, and a plurality of independent straps connected to the airframe and the windshield, the straps operative to move independently with respect to one another. The independent movement of the straps allow relative movement of portions of the windshield in response to a strike. In some implementations, the straps are spaced every 4-6 inches along an edge of the windshield. In some implementations, the straps are over an edge of the windshield. The straps can have a modulus of elasticity of 8-12 millions of pounds per square inch (MSI). The windshield can include polycarbonate material.
1. A rotorcraft, comprising:
an airframe;
a windshield;
a plurality of independent straps connected to the airframe and the windshield and extending between the airframe and the windshield configured to hold the windshield, each strap is separated from the other straps and operative to move independently with respect to the other straps and to flex with respect to the windshield and the airframe; and
wherein each strap is coupled to the windshield by a connector, the connector operative to allow movement of the windshield relative to the strap.
2. The rotorcraft of claim 1 , wherein independent movement of the straps allow relative movement of portions of the windshield in response to a strike.
3. The rotorcraft of claim 1 , wherein the straps are spaced every 4-6 inches along an edge of the windshield.
4. The rotorcraft of claim 1 , wherein the straps extend over an edge of the windshield.
5. The rotorcraft of claim 1 , wherein:
the straps comprise at least one of metal and composite material; and
the windshield comprises polycarbonate.
6. The rotorcraft of claim 1 , wherein the straps comprise a modulus of elasticity of 8-12 millions of pounds per square inch (MSI).
7. The rotorcraft of claim 1 , further comprising an airframe corner support mounted to the airframe at an outside corner of the windshield, the airframe corner support operative to independently support an upper portion of the windshield with respect to the connectors in response to a strike.
8. The rotorcraft of claim 7 , wherein the airframe corner support comprises multiple layers of material.
9. The rotorcraft of claim 7 , wherein the airframe corner support has a modulus of elasticity of 8-12 millions of pounds per square inch (MSI).
10. The rotorcraft of claim 7 , wherein the airframe corner support is secured to the airframe independent of the windshield.
11. The rotorcraft of claim 7 , wherein the airframe corner support is under the windshield.
12. The rotorcraft of claim 1 , further comprising windshield edging securing the windshield to the airframe.
13. The rotorcraft of claim 12 , wherein the windshield edging comprises strapped edging comprising a plurality of secondary straps connected to the windshield.
14. The rotorcraft of claim 13 , wherein each secondary strap of the plurality of secondary straps is coupled to the windshield by the connector, and each connector comprises:
an outboard strap portion configured to attach to an outboard surface of the windshield, the outboard strap portion comprising a first hole;
an inboard strap portion configured to attach to an inboard surface of the windshield, the inboard strap portion comprising a second hole; and
a fastener and a grommet, each configured to pass through the first hole, the second hole and a hole in the windshield and to attach the outboard strap portion and the inboard strap portion to the windshield.
15. The rotorcraft of claim 12 , wherein the windshield edging comprises at least one of metal and a composite material.
16. A windshield assembly for a rotorcraft, comprising:
a windshield;
strapped edging mounted around a periphery of the windshield, the strapped edging comprising a plurality of secondary straps connected to the windshield, each secondary strap comprising an outboard strap portion configured to attach to an outboard surface of the windshield and an inboard strap portion configured to attach to an inboard surface of the windshield;
a plurality of independent straps mounted around the periphery of the windshield, the independent straps operative to move independently with respect to each other and to flex with respect to the windshield and the airframe; and
each independent strap mirroring a corresponding secondary strap of the strapped edging, each independent strap and corresponding secondary strap connected to the windshield by a connector, the independent strap and the corresponding secondary strap to allow movement of the windshield relative to the independent strap and secondary strap.
17. The windshield assembly of claim 16 , the strapped edging comprising at least one of metal and composite material with the secondary straps spaced every 2-3 inches around a majority of the periphery of the windshield.
18. The windshield assembly of claim 16 , the independent straps comprising at least one of metal and composite material and spaced every 4-6 inches around a majority of the periphery of the windshield.
19. The windshield assembly of claim 16 , the connector comprising a grommet and a fastener, each configured to pass through a first hole in the outboard strap portion, a second hole in the inboard strap portion and a third hole in the windshield, and to attach the outboard strap portion and the inboard strap portion to the windshield.