This HWSS seed from

oblique's sscs search program looks like it should be a significant improvement on the original Caterpillar's HWSS recipe:

EDIT: Updated to show more HWSS constructions. There's only one HWSS in the helix that can't be built with this seed -- unfortunately, the location with red gliders is one cell too close to the next HWSS. Should be possible to dig up a more expensive seed for that one HWSS:

`x = 106, y = 1437, rule = LifeHistory`

3.A$.A.A$2.2A4$.A$2.A$3A$10.2D$10.2D2.2D$14.2D5$10.A$11.2A$5.3A2.2A$

7.A$6.A3$16.3D$8.A$8.2A$7.A.A32$30.3A$29.A2.A$32.A$28.A3.A$32.A$29.A.

A8.3A$39.A2.A5.A5.3A$42.A4.3A3.A2.A5.A5.3A$34.3A5.A4.A.2A5.A4.3A3.A2.

A5.A$33.A2.A2.A.A6.3A5.A4.A.2A5.A4.3A5.3A$36.A11.3A2.A.A6.3A5.A4.A.2A

3.A2.A5.A$22.3D11.A11.3A11.3A2.A.A6.3A6.A4.3A$22.D2.D7.A.A12.2A12.3A

11.3A6.A4.A.2A$22.D39.2A12.3A3.A.A6.3A$22.D3.D49.2A13.3A$22.D3.D64.3A

$22.D68.2A$23.D.D4$102.3A$87.A14.A2.A$73.A12.3A4.3A6.A$59.A12.3A4.3A

3.2A.A3.A2.A6.A$45.A12.3A4.3A3.2A.A3.A2.A3.3A7.A7.A.A$44.3A4.3A3.2A.A

3.A2.A3.3A7.A4.2A3.A3.A$37.3A3.2A.A3.A2.A3.3A7.A4.2A3.A3.A9.A3.A$36.A

2.A3.3A7.A4.2A3.A3.A9.A3.A13.A$39.A4.2A3.A3.A9.A3.A13.A10.A.A$35.A3.A

9.A3.A13.A10.A.A$35.A3.A13.A10.A.A$39.A10.A.A$30.3A3.A.A$30.A2.A$30.A

$30.A3.A$30.A$31.A.A38$17.A$18.A$16.3A5$16.A$14.A.A$15.2A$25.2D$25.2D

2.2D$29.2D5$24.A.A$25.2A$20.2A3.A$19.A.A$21.A3$31.3D2$22.2A$23.2A$22.

A4$102.3A$87.A13.A2.A$73.A12.3A4.3A8.A$59.A12.3A4.3A4.A.2A3.A2.A7.A$

45.A12.3A4.3A4.A.2A3.A2.A4.3A3.A7.A.A$44.3A4.3A4.A.2A3.A2.A4.3A3.A7.

2A4.A3.A$37.3A4.A.2A3.A2.A4.3A3.A7.2A4.A3.A9.A3.A$37.A2.A4.3A3.A7.2A

4.A3.A9.A3.A9.A$37.A7.2A4.A3.A9.A3.A9.A14.A.A$37.A3.A9.A3.A9.A14.A.A$

37.A3.A9.A14.A.A$37.A14.A.A$38.A.A5$40.3A$39.A2.A5.A5.3A$42.A4.3A3.A

2.A5.A5.3A$42.A4.A.2A5.A4.3A3.A2.A5.A$39.A.A6.3A5.A4.A.2A5.A4.3A5.3A$

48.3A2.A.A6.3A5.A4.A.2A3.A2.A5.A$48.3A11.3A2.A.A6.3A6.A4.3A$48.2A12.

3A11.3A6.A4.A.2A$62.2A12.3A3.A.A6.3A$76.2A13.3A$91.3A$91.2A5$102.3A$

87.A14.A2.A$73.A12.3A4.3A6.A$59.A12.3A4.3A3.2A.A3.A2.A6.A$45.A12.3A4.

3A3.2A.A3.A2.A3.3A7.A7.A.A$44.3A4.3A3.2A.A3.A2.A3.3A7.A4.2A3.A3.A$37.

3D3.2A.A3.A2.A3.3A7.A4.2A3.A3.A9.A3.A$36.D2.D3.3A7.A4.2A3.A3.A9.A3.A

13.A$39.D4.2A3.A3.A9.A3.A13.A10.A.A$35.D3.D9.A3.A13.A10.A.A$35.D3.D

13.A10.A.A$39.D10.A.A$36.D.D6$48.A5.3A$47.3A4.A2.A4.A5.3A$46.2A.A4.A

6.3A4.A2.A4.A$46.3A5.A5.2A.A4.A6.3A5.3A$46.3A6.A.A2.3A5.A5.2A.A5.A2.A

4.A$46.3A11.3A6.A.A2.3A6.A6.3A$47.2A11.3A11.3A6.A5.2A.A$61.2A11.3A7.A

.A2.3A$75.2A12.3A$89.3A$90.2A5$102.3A$87.A13.A2.A$73.A12.3A4.3A8.A$

59.A12.3A4.3A4.A.2A3.A2.A7.A$45.A12.3A4.3A4.A.2A3.A2.A4.3A3.A7.A.A$

44.3A4.3A4.A.2A3.A2.A4.3A3.A7.2A4.A3.A$44.A.2A3.A2.A4.3A3.A7.2A4.A3.A

9.A3.A$45.3A3.A7.2A4.A3.A9.A3.A9.A$45.2A4.A3.A9.A3.A9.A14.A.A$51.A3.A

9.A14.A.A$51.A14.A.A$52.A.A7$48.A5.3A$47.3A3.A2.A5.A5.3A$47.A.2A5.A4.

3A3.A2.A5.A$48.3A5.A4.A.2A5.A4.3A5.3A$48.3A2.A.A6.3A5.A4.A.2A3.A2.A5.

A$48.3A11.3A2.A.A6.3A6.A4.3A$48.2A12.3A11.3A6.A4.A.2A$62.2A12.3A3.A.A

6.3A$76.2A13.3A$91.3A$91.2A39$27.D$28.2D$27.2D5$25.D.D$26.2D$26.D8.2D

$35.2D2.2D$39.2D5$36.D$31.D5.D64.3A$31.2D2.3D49.A13.A2.A$30.D.D40.A

12.3A4.3A8.A$59.A12.3A4.3A4.A.2A3.A2.A7.A$58.3A4.3A4.A.2A3.A2.A4.3A3.

A7.A.A$51.3A4.A.2A3.A2.A4.3A3.A7.2A4.A3.A$41.3D7.A2.A4.3A3.A7.2A4.A3.

A9.A3.A$33.2D16.A7.2A4.A3.A9.A3.A9.A$32.D.D16.A3.A9.A3.A9.A14.A.A$34.

D16.A3.A9.A14.A.A$51.A14.A.A$52.A.A7$48.A5.3A$47.3A3.A2.A5.A5.3A$47.A

.2A5.A4.3A3.A2.A5.A$48.3A5.A4.A.2A5.A4.3A5.3A$48.3A2.A.A6.3A5.A4.A.2A

3.A2.A5.A$48.3A11.3A2.A.A6.3A6.A4.3A$48.2A12.3A11.3A6.A4.A.2A$62.2A

12.3A3.A.A6.3A$76.2A13.3A$91.3A$91.2A5$102.3A$87.A14.A2.A$73.A12.3A4.

3A6.A$59.A12.3A4.3A3.2A.A3.A2.A6.A$58.3A4.3A3.2A.A3.A2.A3.3A7.A7.A.A$

51.3A3.2A.A3.A2.A3.3A7.A4.2A3.A3.A$50.A2.A3.3A7.A4.2A3.A3.A9.A3.A$53.

A4.2A3.A3.A9.A3.A13.A$49.A3.A9.A3.A13.A10.A.A$49.A3.A13.A10.A.A$53.A

10.A.A$50.A.A7$48.D5.3A$47.3D4.A2.A4.A5.3A$46.2D.D4.A6.3A4.A2.A4.A$

46.3D5.A5.2A.A4.A6.3A5.3A$46.3D6.A.A2.3A5.A5.2A.A5.A2.A4.A$46.3D11.3A

6.A.A2.3A6.A6.3A$47.2D11.3A11.3A6.A5.2A.A$61.2A11.3A7.A.A2.3A$75.2A

12.3A$89.3A$90.2A5$102.3A$87.A13.A2.A$73.A12.3A4.3A8.A$59.A12.3A4.3A

4.A.2A3.A2.A7.A$58.3A4.3A4.A.2A3.A2.A4.3A3.A7.A.A$51.3A4.A.2A3.A2.A4.

3A3.A7.2A4.A3.A$51.A2.A4.3A3.A7.2A4.A3.A9.A3.A$51.A7.2A4.A3.A9.A3.A9.

A$51.A3.A9.A3.A9.A14.A.A$51.A3.A9.A14.A.A$51.A14.A.A$52.A.A7$54.3A$

53.A2.A5.A5.3A$56.A4.3A3.A2.A5.A$56.A4.A.2A5.A4.3A5.3A$53.A.A6.3A5.A

4.A.2A3.A2.A5.A$62.3A2.A.A6.3A6.A4.3A$62.3A11.3A6.A4.A.2A$62.2A12.3A

3.A.A6.3A$76.2A13.3A$91.3A$91.2A23$31.A$32.A$30.3A5$30.A$28.A.A$29.2A

$39.2D$39.2D2.2D$43.2D5$38.A.A$39.2A$34.2A3.A$33.A.A$35.A3$45.3D2$36.

2A$37.2A$36.A5$102.3A$87.A13.A2.A$73.A12.3A4.3A8.A$59.A12.3A4.3A4.A.

2A3.A2.A7.A$58.3A4.3A4.A.2A3.A2.A4.3A3.A7.A.A$51.3A4.A.2A3.A2.A4.3A3.

A7.2A4.A3.A$51.A2.A4.3A3.A7.2A4.A3.A9.A3.A$51.A7.2A4.A3.A9.A3.A9.A$

51.A3.A9.A3.A9.A14.A.A$51.A3.A9.A14.A.A$51.A14.A.A$52.A.A7$54.3A$53.A

2.A5.A5.3A$56.A4.3A3.A2.A5.A$56.A4.A.2A5.A4.3A5.3A$53.A.A6.3A5.A4.A.

2A3.A2.A5.A$62.3A2.A.A6.3A6.A4.3A$62.3A11.3A6.A4.A.2A$62.2A12.3A3.A.A

6.3A$76.2A13.3A$91.3A$91.2A5$102.3A$87.A14.A2.A$73.A12.3A4.3A6.A$59.A

12.3A4.3A3.2A.A3.A2.A6.A$58.3A4.3A3.2A.A3.A2.A3.3A7.A7.A.A$51.3D3.2A.

A3.A2.A3.3A7.A4.2A3.A3.A$50.D2.D3.3A7.A4.2A3.A3.A9.A3.A$53.D4.2A3.A3.

A9.A3.A13.A$49.D3.D9.A3.A13.A10.A.A$49.D3.D13.A10.A.A$53.D10.A.A$50.D

.D7$54.3A$54.A2.A4.A5.3A$54.A6.3A4.A2.A4.A$54.A5.2A.A4.A6.3A5.3A$55.A

.A2.3A5.A5.2A.A5.A2.A4.A$60.3A6.A.A2.3A6.A6.3A$60.3A11.3A6.A5.2A.A$

61.2A11.3A7.A.A2.3A$75.2A12.3A$89.3A$90.2A5$102.3A$87.A13.A2.A$73.A

12.3A4.3A8.A$59.A12.3A4.3A4.A.2A3.A2.A7.A$58.3A4.3A4.A.2A3.A2.A4.3A3.

A7.A.A$58.A.2A3.A2.A4.3A3.A7.2A4.A3.A$59.3A3.A7.2A4.A3.A9.A3.A$59.2A

4.A3.A9.A3.A9.A$65.A3.A9.A14.A.A$65.A14.A.A$66.A.A8$54.3A$53.A2.A5.A

5.3A$56.A4.3A3.A2.A5.A$56.A4.A.2A5.A4.3A5.3A$53.A.A6.3A5.A4.A.2A3.A2.

A5.A$62.3A2.A.A6.3A6.A4.3A$62.3A11.3A6.A4.A.2A$62.2A12.3A3.A.A6.3A$

76.2A13.3A$91.3A$91.2A40$41.A$42.2A$41.2A5$39.A.A$40.2A$40.A8.2D$49.

2D2.2D$53.2D5$50.A51.3A$45.A5.A35.A13.A2.A$45.2A2.3A21.A12.3A4.3A8.A$

44.A.A25.3A4.3A4.A.2A3.A2.A7.A$65.3A4.A.2A3.A2.A4.3A3.A7.A.A$65.A2.A

4.3A3.A7.2A4.A3.A$65.A7.2A4.A3.A9.A3.A$55.3D7.A3.A9.A3.A9.A$47.2A16.A

3.A9.A14.A.A$46.A.A16.A14.A.A$48.A17.A.A9$62.A5.3A$61.3A3.A2.A5.A$61.

A.2A5.A4.3A5.3A$62.3A5.A4.A.2A3.A2.A5.A$62.3A2.A.A6.3A6.A4.3A$62.3A

11.3A6.A4.A.2A$62.2A12.3A3.A.A6.3A$76.2A13.3A$91.3A$91.2A5$102.3A$87.

A14.A2.A$73.A12.3A4.3A6.A$72.3A4.3A3.2A.A3.A2.A6.A$65.3A3.2A.A3.A2.A

3.3A7.A7.A.A$64.A2.A3.3A7.A4.2A3.A3.A$67.A4.2A3.A3.A9.A3.A$63.A3.A9.A

3.A13.A$63.A3.A13.A10.A.A$67.A10.A.A$64.A.A9$62.D5.3A$61.3D4.A2.A4.A$

60.2D.D4.A6.3A5.3A$60.3D5.A5.2A.A5.A2.A4.A$60.3D6.A.A2.3A6.A6.3A$60.

3D11.3A6.A5.2A.A$61.2D11.3A7.A.A2.3A$75.2A12.3A$89.3A$90.2A5$102.3A$

87.A13.A2.A$73.A12.3A4.3A8.A$72.3A4.3A4.A.2A3.A2.A7.A$65.3A4.A.2A3.A

2.A4.3A3.A7.A.A$65.A2.A4.3A3.A7.2A4.A3.A$65.A7.2A4.A3.A9.A3.A$65.A3.A

9.A3.A9.A$65.A3.A9.A14.A.A$65.A14.A.A$66.A.A9$68.3A$67.A2.A5.A$70.A4.

3A5.3A$70.A4.A.2A3.A2.A5.A$67.A.A6.3A6.A4.3A$76.3A6.A4.A.2A$76.3A3.A.

A6.3A$76.2A13.3A$91.3A$91.2A22$45.A$46.A$44.3A5$44.A$42.A.A$43.2A$53.

2D$53.2D2.2D$57.2D5$52.A.A$53.2A$48.2A3.A$47.A.A$49.A3$59.3D2$50.2A$

51.2A$50.A6$102.3A$87.A13.A2.A$73.A12.3A4.3A8.A$72.3A4.3A4.A.2A3.A2.A

7.A$65.3A4.A.2A3.A2.A4.3A3.A7.A.A$65.A2.A4.3A3.A7.2A4.A3.A$65.A7.2A4.

A3.A9.A3.A$65.A3.A9.A3.A9.A$65.A3.A9.A14.A.A$65.A14.A.A$66.A.A9$68.3A

$67.A2.A5.A$70.A4.3A5.3A$70.A4.A.2A3.A2.A5.A$67.A.A6.3A6.A4.3A$76.3A

6.A4.A.2A$76.3A3.A.A6.3A$76.2A13.3A$91.3A$91.2A5$102.3A$87.A14.A2.A$

73.A12.3A4.3A6.A$72.3A4.3A3.2A.A3.A2.A6.A$65.3D3.2A.A3.A2.A3.3A7.A7.A

.A$64.D2.D3.3A7.A4.2A3.A3.A$67.D4.2A3.A3.A9.A3.A$63.D3.D9.A3.A13.A$

63.D3.D13.A10.A.A$67.D10.A.A$64.D.D9$68.3A$68.A2.A4.A$68.A6.3A5.3A$

68.A5.2A.A5.A2.A4.A$69.A.A2.3A6.A6.3A$74.3A6.A5.2A.A$74.3A7.A.A2.3A$

75.2A12.3A$89.3A$90.2A5$102.3A$87.A13.A2.A$73.A12.3A4.3A8.A$72.3A4.3A

4.A.2A3.A2.A7.A$72.A.2A3.A2.A4.3A3.A7.A.A$73.3A3.A7.2A4.A3.A$73.2A4.A

3.A9.A3.A$79.A3.A9.A$79.A14.A.A$80.A.A10$68.3A$67.A2.A5.A$70.A4.3A5.

3A$70.A4.A.2A3.A2.A5.A$67.A.A6.3A6.A4.3A$76.3A6.A4.A.2A$76.3A3.A.A6.

3A$76.2A13.3A$91.3A$91.2A41$55.A$56.2A$55.2A5$53.A.A$54.2A$54.A8.2D$

63.2D2.2D$67.2D4$102.3A$64.A22.A13.A2.A$59.A5.A20.3A4.3A8.A$59.2A2.3A

13.3A4.A.2A3.A2.A7.A$58.A.A18.A2.A4.3A3.A7.A.A$79.A7.2A4.A3.A$79.A3.A

9.A3.A$79.A3.A9.A$69.3D7.A14.A.A$61.2A17.A.A$60.A.A$62.A9$76.A$75.3A

5.3A$75.A.2A3.A2.A5.A$76.3A6.A4.3A$76.3A6.A4.A.2A$76.3A3.A.A6.3A$76.

2A13.3A$91.3A$91.2A5$102.3A$87.A14.A2.A$86.3A4.3A6.A$79.3A3.2A.A3.A2.

A6.A$78.A2.A3.3A7.A7.A.A$81.A4.2A3.A3.A$77.A3.A9.A3.A$77.A3.A13.A$81.

A10.A.A$78.A.A11$76.D$75.3D5.3A$74.2D.D5.A2.A4.A$74.3D6.A6.3A$74.3D6.

A5.2A.A$74.3D7.A.A2.3A$75.2D12.3A$89.3A$90.2A5$102.3A$87.A13.A2.A$86.

3A4.3A8.A$79.3A4.A.2A3.A2.A7.A$79.A2.A4.3A3.A7.A.A$79.A7.2A4.A3.A$79.

A3.A9.A3.A$79.A3.A9.A$79.A14.A.A$80.A.A12$83.3A$82.A2.A5.A$85.A4.3A$

85.A4.A.2A$82.A.A6.3A$91.3A$91.3A$91.2A21$59.A$60.A$58.3A5$58.A$56.A.

A$57.2A$67.2D$67.2D2.2D$71.2D5$66.A.A$67.2A$62.2A3.A$61.A.A$63.A3$73.

3D2$64.2A$65.2A$64.A7$102.3A$87.A13.A2.A$86.3A4.3A8.A$79.3A4.A.2A3.A

2.A7.A$79.A2.A4.3A3.A7.A.A$79.A7.2A4.A3.A$79.A3.A9.A3.A$79.A3.A9.A$

79.A14.A.A$80.A.A12$83.3A$82.A2.A5.A$85.A4.3A$85.A4.A.2A$82.A.A6.3A$

91.3A$91.3A$91.2A5$102.3A$87.A14.A2.A$86.3A4.3A6.A$79.3D3.2A.A3.A2.A

6.A$78.D2.D3.3A7.A7.A.A$81.D4.2A3.A3.A$77.D3.D9.A3.A$77.D3.D13.A$81.D

10.A.A$78.D.D12$83.3A$83.A2.A4.A$83.A6.3A$83.A5.2A.A$84.A.A2.3A$89.3A

$89.3A$90.2A5$102.3A$87.A13.A2.A$86.3A4.3A8.A$86.A.2A3.A2.A7.A$87.3A

3.A7.A.A$87.2A4.A3.A$93.A3.A$93.A$94.A.A13$83.3A$82.A2.A5.A$85.A4.3A$

85.A4.A.2A$82.A.A6.3A$91.3A$91.3A$91.2A43$70.A$71.2A$70.2A5$68.A.A$

69.2A$69.A8.2D$78.2D2.2D$82.2D2$102.3A$101.A2.A$93.3A8.A$79.A13.A2.A

7.A$74.A5.A12.A7.A.A$74.2A2.3A12.A3.A$73.A.A17.A3.A$93.A$94.A.A2$84.

3D$76.2A$75.A.A$77.A9$91.A$90.3A$90.A.2A$91.3A$91.3A$91.3A$91.2A5$

102.3A$102.A2.A$93.3A6.A$92.A2.A6.A$95.A7.A.A$91.A3.A$91.A3.A$95.A$

92.A.A14$91.D$90.3D$89.2D.D$89.3D$89.3D$89.3D$90.2D5$102.3A$101.A2.A$

93.3A8.A$93.A2.A7.A$93.A7.A.A$93.A3.A$93.A3.A$93.A$94.A.A40$73.A$74.A

$72.3A5$72.A$70.A.A$71.2A$81.2D$81.2D2.2D$85.2D5$80.A.A$81.2A$76.2A3.

A$75.A.A$77.A3$87.3D2$78.2A$79.2A$78.A8$102.3A$101.A2.A$93.3A8.A$93.A

2.A7.A$93.A7.A.A$93.A3.A$93.A3.A$93.A$94.A.A25$102.3A$102.A2.A$93.3D

6.A$92.D2.D6.A$95.D7.A.A$91.D3.D$91.D3.D$95.D$92.D.D25$102.3A$101.A2.

A$104.A$104.A$101.A.A!

Here's the flat RLE version of the test pattern:

`x = 106, y = 1437, rule = B3/S23`

3bo$bobo$2b2o4$bo$2bo$3o8$10bo$11b2o$5b3o2b2o$7bo$6bo4$8bo$8b2o$7bobo

32$30b3o$29bo2bo$32bo$28bo3bo$32bo$29bobo8b3o$39bo2bo5bo5b3o$42bo4b3o

3bo2bo5bo5b3o$34b3o5bo4bob2o5bo4b3o3bo2bo5bo$33bo2bo2bobo6b3o5bo4bob2o

5bo4b3o5b3o$36bo11b3o2bobo6b3o5bo4bob2o3bo2bo5bo$36bo11b3o11b3o2bobo6b

3o6bo4b3o$33bobo12b2o12b3o11b3o6bo4bob2o$62b2o12b3o3bobo6b3o$76b2o13b

3o$91b3o$91b2o5$102b3o$87bo14bo2bo$73bo12b3o4b3o6bo$59bo12b3o4b3o3b2ob

o3bo2bo6bo$45bo12b3o4b3o3b2obo3bo2bo3b3o7bo7bobo$44b3o4b3o3b2obo3bo2bo

3b3o7bo4b2o3bo3bo$37b3o3b2obo3bo2bo3b3o7bo4b2o3bo3bo9bo3bo$36bo2bo3b3o

7bo4b2o3bo3bo9bo3bo13bo$39bo4b2o3bo3bo9bo3bo13bo10bobo$35bo3bo9bo3bo

13bo10bobo$35bo3bo13bo10bobo$39bo10bobo$30b3o3bobo$30bo2bo$30bo$30bo3b

o$30bo$31bobo38$17bo$18bo$16b3o5$16bo$14bobo$15b2o8$24bobo$25b2o$20b2o

3bo$19bobo$21bo5$22b2o$23b2o$22bo4$102b3o$87bo13bo2bo$73bo12b3o4b3o8bo

$59bo12b3o4b3o4bob2o3bo2bo7bo$45bo12b3o4b3o4bob2o3bo2bo4b3o3bo7bobo$

44b3o4b3o4bob2o3bo2bo4b3o3bo7b2o4bo3bo$37b3o4bob2o3bo2bo4b3o3bo7b2o4bo

3bo9bo3bo$37bo2bo4b3o3bo7b2o4bo3bo9bo3bo9bo$37bo7b2o4bo3bo9bo3bo9bo14b

obo$37bo3bo9bo3bo9bo14bobo$37bo3bo9bo14bobo$37bo14bobo$38bobo5$40b3o$

39bo2bo5bo5b3o$42bo4b3o3bo2bo5bo5b3o$42bo4bob2o5bo4b3o3bo2bo5bo$39bobo

6b3o5bo4bob2o5bo4b3o5b3o$48b3o2bobo6b3o5bo4bob2o3bo2bo5bo$48b3o11b3o2b

obo6b3o6bo4b3o$48b2o12b3o11b3o6bo4bob2o$62b2o12b3o3bobo6b3o$76b2o13b3o

$91b3o$91b2o5$102b3o$87bo14bo2bo$73bo12b3o4b3o6bo$59bo12b3o4b3o3b2obo

3bo2bo6bo$45bo12b3o4b3o3b2obo3bo2bo3b3o7bo7bobo$44b3o4b3o3b2obo3bo2bo

3b3o7bo4b2o3bo3bo$43b2obo3bo2bo3b3o7bo4b2o3bo3bo9bo3bo$43b3o7bo4b2o3bo

3bo9bo3bo13bo$44b2o3bo3bo9bo3bo13bo10bobo$49bo3bo13bo10bobo$53bo10bobo

$50bobo7$48bo5b3o$47b3o4bo2bo4bo5b3o$46b2obo4bo6b3o4bo2bo4bo$46b3o5bo

5b2obo4bo6b3o5b3o$46b3o6bobo2b3o5bo5b2obo5bo2bo4bo$46b3o11b3o6bobo2b3o

6bo6b3o$47b2o11b3o11b3o6bo5b2obo$61b2o11b3o7bobo2b3o$75b2o12b3o$89b3o$

90b2o5$102b3o$87bo13bo2bo$73bo12b3o4b3o8bo$59bo12b3o4b3o4bob2o3bo2bo7b

o$45bo12b3o4b3o4bob2o3bo2bo4b3o3bo7bobo$44b3o4b3o4bob2o3bo2bo4b3o3bo7b

2o4bo3bo$44bob2o3bo2bo4b3o3bo7b2o4bo3bo9bo3bo$45b3o3bo7b2o4bo3bo9bo3bo

9bo$45b2o4bo3bo9bo3bo9bo14bobo$51bo3bo9bo14bobo$51bo14bobo$52bobo7$48b

o5b3o$47b3o3bo2bo5bo5b3o$47bob2o5bo4b3o3bo2bo5bo$48b3o5bo4bob2o5bo4b3o

5b3o$48b3o2bobo6b3o5bo4bob2o3bo2bo5bo$48b3o11b3o2bobo6b3o6bo4b3o$48b2o

12b3o11b3o6bo4bob2o$62b2o12b3o3bobo6b3o$76b2o13b3o$91b3o$91b2o56$102b

3o$87bo13bo2bo$73bo12b3o4b3o8bo$59bo12b3o4b3o4bob2o3bo2bo7bo$58b3o4b3o

4bob2o3bo2bo4b3o3bo7bobo$51b3o4bob2o3bo2bo4b3o3bo7b2o4bo3bo$51bo2bo4b

3o3bo7b2o4bo3bo9bo3bo$51bo7b2o4bo3bo9bo3bo9bo$51bo3bo9bo3bo9bo14bobo$

51bo3bo9bo14bobo$51bo14bobo$52bobo7$48bo5b3o$47b3o3bo2bo5bo5b3o$47bob

2o5bo4b3o3bo2bo5bo$48b3o5bo4bob2o5bo4b3o5b3o$48b3o2bobo6b3o5bo4bob2o3b

o2bo5bo$48b3o11b3o2bobo6b3o6bo4b3o$48b2o12b3o11b3o6bo4bob2o$62b2o12b3o

3bobo6b3o$76b2o13b3o$91b3o$91b2o5$102b3o$87bo14bo2bo$73bo12b3o4b3o6bo$

59bo12b3o4b3o3b2obo3bo2bo6bo$58b3o4b3o3b2obo3bo2bo3b3o7bo7bobo$51b3o3b

2obo3bo2bo3b3o7bo4b2o3bo3bo$50bo2bo3b3o7bo4b2o3bo3bo9bo3bo$53bo4b2o3bo

3bo9bo3bo13bo$49bo3bo9bo3bo13bo10bobo$49bo3bo13bo10bobo$53bo10bobo$50b

obo7$54b3o$54bo2bo4bo5b3o$54bo6b3o4bo2bo4bo$54bo5b2obo4bo6b3o5b3o$55bo

bo2b3o5bo5b2obo5bo2bo4bo$60b3o6bobo2b3o6bo6b3o$60b3o11b3o6bo5b2obo$61b

2o11b3o7bobo2b3o$75b2o12b3o$89b3o$90b2o5$102b3o$87bo13bo2bo$73bo12b3o

4b3o8bo$59bo12b3o4b3o4bob2o3bo2bo7bo$58b3o4b3o4bob2o3bo2bo4b3o3bo7bobo

$51b3o4bob2o3bo2bo4b3o3bo7b2o4bo3bo$51bo2bo4b3o3bo7b2o4bo3bo9bo3bo$51b

o7b2o4bo3bo9bo3bo9bo$51bo3bo9bo3bo9bo14bobo$51bo3bo9bo14bobo$51bo14bob

o$52bobo7$54b3o$53bo2bo5bo5b3o$56bo4b3o3bo2bo5bo$56bo4bob2o5bo4b3o5b3o

$53bobo6b3o5bo4bob2o3bo2bo5bo$62b3o2bobo6b3o6bo4b3o$62b3o11b3o6bo4bob

2o$62b2o12b3o3bobo6b3o$76b2o13b3o$91b3o$91b2o23$31bo$32bo$30b3o5$30bo$

28bobo$29b2o8$38bobo$39b2o$34b2o3bo$33bobo$35bo5$36b2o$37b2o$36bo5$

102b3o$87bo13bo2bo$73bo12b3o4b3o8bo$59bo12b3o4b3o4bob2o3bo2bo7bo$58b3o

4b3o4bob2o3bo2bo4b3o3bo7bobo$51b3o4bob2o3bo2bo4b3o3bo7b2o4bo3bo$51bo2b

o4b3o3bo7b2o4bo3bo9bo3bo$51bo7b2o4bo3bo9bo3bo9bo$51bo3bo9bo3bo9bo14bob

o$51bo3bo9bo14bobo$51bo14bobo$52bobo7$54b3o$53bo2bo5bo5b3o$56bo4b3o3bo

2bo5bo$56bo4bob2o5bo4b3o5b3o$53bobo6b3o5bo4bob2o3bo2bo5bo$62b3o2bobo6b

3o6bo4b3o$62b3o11b3o6bo4bob2o$62b2o12b3o3bobo6b3o$76b2o13b3o$91b3o$91b

2o5$102b3o$87bo14bo2bo$73bo12b3o4b3o6bo$59bo12b3o4b3o3b2obo3bo2bo6bo$

58b3o4b3o3b2obo3bo2bo3b3o7bo7bobo$57b2obo3bo2bo3b3o7bo4b2o3bo3bo$57b3o

7bo4b2o3bo3bo9bo3bo$58b2o3bo3bo9bo3bo13bo$63bo3bo13bo10bobo$67bo10bobo

$64bobo8$54b3o$54bo2bo4bo5b3o$54bo6b3o4bo2bo4bo$54bo5b2obo4bo6b3o5b3o$

55bobo2b3o5bo5b2obo5bo2bo4bo$60b3o6bobo2b3o6bo6b3o$60b3o11b3o6bo5b2obo

$61b2o11b3o7bobo2b3o$75b2o12b3o$89b3o$90b2o5$102b3o$87bo13bo2bo$73bo

12b3o4b3o8bo$59bo12b3o4b3o4bob2o3bo2bo7bo$58b3o4b3o4bob2o3bo2bo4b3o3bo

7bobo$58bob2o3bo2bo4b3o3bo7b2o4bo3bo$59b3o3bo7b2o4bo3bo9bo3bo$59b2o4bo

3bo9bo3bo9bo$65bo3bo9bo14bobo$65bo14bobo$66bobo8$54b3o$53bo2bo5bo5b3o$

56bo4b3o3bo2bo5bo$56bo4bob2o5bo4b3o5b3o$53bobo6b3o5bo4bob2o3bo2bo5bo$

62b3o2bobo6b3o6bo4b3o$62b3o11b3o6bo4bob2o$62b2o12b3o3bobo6b3o$76b2o13b

3o$91b3o$91b2o40$41bo$42b2o$41b2o5$39bobo$40b2o$40bo7$50bo51b3o$45bo5b

o35bo13bo2bo$45b2o2b3o21bo12b3o4b3o8bo$44bobo25b3o4b3o4bob2o3bo2bo7bo$

65b3o4bob2o3bo2bo4b3o3bo7bobo$65bo2bo4b3o3bo7b2o4bo3bo$65bo7b2o4bo3bo

9bo3bo$65bo3bo9bo3bo9bo$47b2o16bo3bo9bo14bobo$46bobo16bo14bobo$48bo17b

obo9$62bo5b3o$61b3o3bo2bo5bo$61bob2o5bo4b3o5b3o$62b3o5bo4bob2o3bo2bo5b

o$62b3o2bobo6b3o6bo4b3o$62b3o11b3o6bo4bob2o$62b2o12b3o3bobo6b3o$76b2o

13b3o$91b3o$91b2o5$102b3o$87bo14bo2bo$73bo12b3o4b3o6bo$72b3o4b3o3b2obo

3bo2bo6bo$65b3o3b2obo3bo2bo3b3o7bo7bobo$64bo2bo3b3o7bo4b2o3bo3bo$67bo

4b2o3bo3bo9bo3bo$63bo3bo9bo3bo13bo$63bo3bo13bo10bobo$67bo10bobo$64bobo

9$68b3o$68bo2bo4bo$68bo6b3o5b3o$68bo5b2obo5bo2bo4bo$69bobo2b3o6bo6b3o$

74b3o6bo5b2obo$74b3o7bobo2b3o$75b2o12b3o$89b3o$90b2o5$102b3o$87bo13bo

2bo$73bo12b3o4b3o8bo$72b3o4b3o4bob2o3bo2bo7bo$65b3o4bob2o3bo2bo4b3o3bo

7bobo$65bo2bo4b3o3bo7b2o4bo3bo$65bo7b2o4bo3bo9bo3bo$65bo3bo9bo3bo9bo$

65bo3bo9bo14bobo$65bo14bobo$66bobo9$68b3o$67bo2bo5bo$70bo4b3o5b3o$70bo

4bob2o3bo2bo5bo$67bobo6b3o6bo4b3o$76b3o6bo4bob2o$76b3o3bobo6b3o$76b2o

13b3o$91b3o$91b2o22$45bo$46bo$44b3o5$44bo$42bobo$43b2o8$52bobo$53b2o$

48b2o3bo$47bobo$49bo5$50b2o$51b2o$50bo6$102b3o$87bo13bo2bo$73bo12b3o4b

3o8bo$72b3o4b3o4bob2o3bo2bo7bo$65b3o4bob2o3bo2bo4b3o3bo7bobo$65bo2bo4b

3o3bo7b2o4bo3bo$65bo7b2o4bo3bo9bo3bo$65bo3bo9bo3bo9bo$65bo3bo9bo14bobo

$65bo14bobo$66bobo9$68b3o$67bo2bo5bo$70bo4b3o5b3o$70bo4bob2o3bo2bo5bo$

67bobo6b3o6bo4b3o$76b3o6bo4bob2o$76b3o3bobo6b3o$76b2o13b3o$91b3o$91b2o

5$102b3o$87bo14bo2bo$73bo12b3o4b3o6bo$72b3o4b3o3b2obo3bo2bo6bo$71b2obo

3bo2bo3b3o7bo7bobo$71b3o7bo4b2o3bo3bo$72b2o3bo3bo9bo3bo$77bo3bo13bo$

81bo10bobo$78bobo10$68b3o$68bo2bo4bo$68bo6b3o5b3o$68bo5b2obo5bo2bo4bo$

69bobo2b3o6bo6b3o$74b3o6bo5b2obo$74b3o7bobo2b3o$75b2o12b3o$89b3o$90b2o

5$102b3o$87bo13bo2bo$73bo12b3o4b3o8bo$72b3o4b3o4bob2o3bo2bo7bo$72bob2o

3bo2bo4b3o3bo7bobo$73b3o3bo7b2o4bo3bo$73b2o4bo3bo9bo3bo$79bo3bo9bo$79b

o14bobo$80bobo10$68b3o$67bo2bo5bo$70bo4b3o5b3o$70bo4bob2o3bo2bo5bo$67b

obo6b3o6bo4b3o$76b3o6bo4bob2o$76b3o3bobo6b3o$76b2o13b3o$91b3o$91b2o41$

55bo$56b2o$55b2o5$53bobo$54b2o$54bo6$102b3o$64bo22bo13bo2bo$59bo5bo20b

3o4b3o8bo$59b2o2b3o13b3o4bob2o3bo2bo7bo$58bobo18bo2bo4b3o3bo7bobo$79bo

7b2o4bo3bo$79bo3bo9bo3bo$79bo3bo9bo$79bo14bobo$61b2o17bobo$60bobo$62bo

9$76bo$75b3o5b3o$75bob2o3bo2bo5bo$76b3o6bo4b3o$76b3o6bo4bob2o$76b3o3bo

bo6b3o$76b2o13b3o$91b3o$91b2o5$102b3o$87bo14bo2bo$86b3o4b3o6bo$79b3o3b

2obo3bo2bo6bo$78bo2bo3b3o7bo7bobo$81bo4b2o3bo3bo$77bo3bo9bo3bo$77bo3bo

13bo$81bo10bobo$78bobo12$83b3o$83bo2bo4bo$83bo6b3o$83bo5b2obo$84bobo2b

3o$89b3o$89b3o$90b2o5$102b3o$87bo13bo2bo$86b3o4b3o8bo$79b3o4bob2o3bo2b

o7bo$79bo2bo4b3o3bo7bobo$79bo7b2o4bo3bo$79bo3bo9bo3bo$79bo3bo9bo$79bo

14bobo$80bobo12$83b3o$82bo2bo5bo$85bo4b3o$85bo4bob2o$82bobo6b3o$91b3o$

91b3o$91b2o21$59bo$60bo$58b3o5$58bo$56bobo$57b2o8$66bobo$67b2o$62b2o3b

o$61bobo$63bo5$64b2o$65b2o$64bo7$102b3o$87bo13bo2bo$86b3o4b3o8bo$79b3o

4bob2o3bo2bo7bo$79bo2bo4b3o3bo7bobo$79bo7b2o4bo3bo$79bo3bo9bo3bo$79bo

3bo9bo$79bo14bobo$80bobo12$83b3o$82bo2bo5bo$85bo4b3o$85bo4bob2o$82bobo

6b3o$91b3o$91b3o$91b2o5$102b3o$87bo14bo2bo$86b3o4b3o6bo$85b2obo3bo2bo

6bo$85b3o7bo7bobo$86b2o3bo3bo$91bo3bo$95bo$92bobo13$83b3o$83bo2bo4bo$

83bo6b3o$83bo5b2obo$84bobo2b3o$89b3o$89b3o$90b2o5$102b3o$87bo13bo2bo$

86b3o4b3o8bo$86bob2o3bo2bo7bo$87b3o3bo7bobo$87b2o4bo3bo$93bo3bo$93bo$

94bobo13$83b3o$82bo2bo5bo$85bo4b3o$85bo4bob2o$82bobo6b3o$91b3o$91b3o$

91b2o43$70bo$71b2o$70b2o5$68bobo$69b2o$69bo4$102b3o$101bo2bo$93b3o8bo$

79bo13bo2bo7bo$74bo5bo12bo7bobo$74b2o2b3o12bo3bo$73bobo17bo3bo$93bo$

94bobo3$76b2o$75bobo$77bo9$91bo$90b3o$90bob2o$91b3o$91b3o$91b3o$91b2o

5$102b3o$102bo2bo$93b3o6bo$92bo2bo6bo$95bo7bobo$91bo3bo$91bo3bo$95bo$

92bobo25$102b3o$101bo2bo$93b3o8bo$93bo2bo7bo$93bo7bobo$93bo3bo$93bo3bo

$93bo$94bobo40$73bo$74bo$72b3o5$72bo$70bobo$71b2o8$80bobo$81b2o$76b2o

3bo$75bobo$77bo5$78b2o$79b2o$78bo8$102b3o$101bo2bo$93b3o8bo$93bo2bo7bo

$93bo7bobo$93bo3bo$93bo3bo$93bo$94bobo25$102b3o$102bo2bo$102bo$102bo$

103bobo29$102b3o$101bo2bo$104bo$104bo$101bobo!

Anyone see problem points that I'm missing? The blinker is close to the HWSS stream, so this recipe wouldn't work for odd-period streams, but that's not a problem here. It can drop an HWSS very closely in front of an approaching *WSS, but it's a slow insertion reaction so it can't construct immediately behind a passing *WSS.

A sixth glider can be added to clean up the leftover block, unless the block turns out to be useful. It would be interesting to build a slow-salvo version of the Caterpillar, where all the gliders come from the northwest, and the block is re-used as a target to build the next *WSS.

EDIT: Here's the slow-salvo recipe

extracted from oblique's results, as it would come from a 31c/240 rake:

`x = 10497, y = 10500, rule = B3/S23`

2bo$obo$b2o1194$1215bo$1213bobo$1214b2o1926$3123bo$3121bobo$3122b2o

1005$4141bobo$4142b2o$4142bo626$4754bo$4755b2o$4754b2o2588$7367bo$

7368b2o$7367b2o1497$8860bo$8861b2o$8860b2o1377$10229bo$10230bo$10228b

3o263$10494bo$10495b2o$10494b2o3$10494b2o$10495b2o$10494bo!

So this particular recipe doesn't work as a slow salvo: unless the fourth through eighth SEward gliders are sent in very quick succession, the intermediate targets will all just barely get in the way of passing HWSSes. But the current search is optimized for 31c/240, anyway -- there will be other HWSS edge-shooter slow salvos for 17c/45 rakes. It wouldn't even be all that expensive to design a new slow salvo that builds the above HWSS seed one piece at a time, but without intruding on the upship lane.

EDIT 2: Pure slow-salvo recipes for the above HWSS seed

are posted on the sscs search thread. They were assembled manually from known atomic operations, so there are undoubtedly much shorter solutions out there. It looks to me as if the 16-glider seed recipe would work fine in a Caterpillar, which has a period of 270 instead of 240 and also moves much faster than the 31c/240 reaction, so its recipes just have to fit in a modulo-102 vertical stripe instead of modulo-31.

These slow salvos don't address the problem of building the one problem HWSS in the original helix, though. That one is still unbuildable by known slow salvos. -- Well, there again a recipe

could be manually strung together to make a slow-salvo seed for the four synchronized gliders used by the original Caterpillar, but that would be ridiculously expensive. The search continues for alternative HWSS seeds.