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  • Helicopter Man: Igor Sikorsky and His Amazing Invention (Genius at Work! Great Inventor Biographies)

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Buy from Amazon $99.31$0.01 $75.00 $50.00 $25.00 Apr Jul Oct Jan Apr Jul Oct Jan Apr 2014 2015 2016 $20.34, Jan 9 - Sep 24$20.34, Jan 9 - Sep 24$11.30, May 2 - Jun 20$11.29, May 2 - May 17$20.34, Jan 9 - Sep 24$11.30, May 2 - Jun 20$11.28, May 18 1:27 pm$20.34, Jan 9 - Sep 24$11.30, May 2 - Jun 20$11.29, May 28 - Jun 20$20.34, Jan 9 - Sep 24$10.99, Jun 20 - Jul 2$10.98, Jun 20 - Jul 2$20.34, Jan 9 - Sep 24$11.30, Jul 3 - Jul 7$11.29, Jul 3 12:57 pm$20.34, Jan 9 - Sep 24$15.30, Jul 5 - Jul 7$11.30, Jul 3 - Jul 7$20.34, Jan 9 - Sep 24$10.99, Jul 8 - Nov 15$10.98, Jul 8 - Jul 21$24.85, Jul 22 - Jul 28$20.34, Jan 9 - Sep 24$10.99, Jul 8 - Nov 15$24.96, Jul 29 - Aug 19$20.34, Jan 9 - Sep 24$10.99, Jul 8 - Nov 15$99.31, Aug 21 12:53 pm$20.34, Jan 9 - Sep 24$10.99, Jul 8 - Nov 15$53.17, Aug 22 - Aug 25$20.34, Jan 9 - Sep 24$10.99, Jul 8 - Nov 15$39.94, Aug 26 - Aug 28$20.34, Jan 9 - Sep 24$10.99, Jul 8 - Nov 15$20.34, Jan 9 - Sep 24$15.11, Aug 30 - Sep 15$10.99, Jul 8 - Nov 15$24.96, Sep 17 1:05 pm$20.34, Jan 9 - Sep 24$10.99, Jul 8 - Nov 15$20.34, Jan 9 - Sep 24$10.99, Jul 8 - Nov 15$6.00, Sep 19 - Oct 4$21.55, Sep 26 - Nov 10$10.99, Jul 8 - Nov 15$6.00, Sep 19 - Oct 4$21.55, Sep 26 - Nov 10$10.99, Jul 8 - Nov 15$5.98, Oct 6 - Oct 10$21.55, Sep 26 - Nov 10$10.99, Jul 8 - Nov 15$5.97, Oct 12 - Oct 23$21.55, Sep 26 - Nov 10$10.99, Jul 8 - Nov 15$4.45, Oct 29 7:54 pm$21.55, Sep 26 - Nov 10$10.99, Jul 8 - Nov 15$4.42, Nov 4 8:34 am$21.55, Sep 26 - Nov 10$10.99, Jul 8 - Nov 15$4.39, Nov 10 1:00 pm$21.16, Nov 15 - Nov 21$10.99, Jul 8 - Nov 15$4.40, Nov 15 8:27 pm$21.16, Nov 15 - Nov 21$17.98, Nov 19 12:04 am$4.39, Nov 19 - Nov 25$21.16, Nov 15 - Nov 21$18.51, Nov 21 - Dec 13$4.39, Nov 19 - Nov 25$21.55, Nov 23 - Dec 21$18.51, Nov 21 - Dec 13$4.39, Nov 19 - Nov 25$21.55, Nov 23 - Dec 21$18.51, Nov 21 - Dec 13$4.38, Nov 27 - Nov 29$21.55, Nov 23 - Dec 21$18.51, Nov 21 - Dec 13$4.36, Dec 1 2:06 am$21.55, Nov 23 - Dec 21$18.51, Nov 21 - Dec 13$4.32, Dec 3 1:23 am$21.55, Nov 23 - Dec 21$18.51, Nov 21 - Dec 13$4.27, Dec 4 11:10 pm$21.55, Nov 23 - Dec 21$18.51, Nov 21 - Dec 13$4.26, Dec 6 10:16 pm$21.55, Nov 23 - Dec 21$18.51, Nov 21 - Dec 13$4.23, Dec 9 12:21 am$21.55, Nov 23 - Dec 21$18.51, Nov 21 - Dec 13$4.18, Dec 11 5:26 am$21.55, Nov 23 - Dec 21$19.96, Dec 15 12:35 am$4.09, Dec 15 12:35 am$21.55, Nov 23 - Dec 21$21.54, Dec 16 - Dec 21$4.05, Dec 16 11:51 pm$21.55, Nov 23 - Dec 21$21.54, Dec 16 - Dec 21$3.98, Dec 21 8:43 pm$23.01, Jan 1 4:28 pm$19.01, Jan 1 4:28 pm$5.04, Jan 1 4:28 pm$23.23, Jan 3 - Jan 18$19.23, Jan 3 - Jan 10$5.02, Jan 3 - Jan 5$23.23, Jan 3 - Jan 18$19.23, Jan 3 - Jan 10$4.99, Jan 6 6:25 pm$23.23, Jan 3 - Jan 18$19.23, Jan 3 - Jan 10$4.95, Jan 8 11:25 pm$23.23, Jan 3 - Jan 18$19.92, Jan 11 4:29 am$4.91, Jan 11 4:29 am$23.23, Jan 3 - Jan 18$23.22, Jan 12 - Jan 14$4.89, Jan 12 12:54 pm$23.23, Jan 15 6:51 pm$23.23, Jan 3 - Jan 18$4.83, Jan 15 6:51 pm$23.23, Jan 3 - Jan 18$19.14, Jan 17 11:15 am$4.80, Jan 17 11:15 am$22.60, Jan 20 - Jan 26$18.42, Jan 20 12:16 am$4.76, Jan 20 12:16 am$22.60, Jan 20 - Jan 26$18.39, Jan 21 2:30 pm$4.73, Jan 21 2:30 pm$22.60, Jan 20 - Jan 26$18.42, Jan 23 5:41 am$3.93, Jan 23 5:41 am$22.60, Jan 20 - Jan 26$18.37, Jan 26 12:56 pm$3.53, Jan 26 12:56 pm$21.55, Jan 28 - Mar 17$18.26, Jan 28 6:43 am$2.80, Jan 28 6:43 am$21.55, Jan 28 - Mar 17$18.50, Jan 30 - Feb 2$2.07, Jan 30 12:13 am$21.55, Jan 28 - Mar 17$18.50, Jan 30 - Feb 2$1.55, Jan 31 7:14 pm$21.55, Jan 28 - Mar 17$18.50, Jan 30 - Feb 2$1.30, Feb 2 1:51 pm$21.55, Jan 28 - Mar 17$17.55, Feb 4 - Feb 6$0.71, Feb 6 3:33 am$21.55, Jan 28 - Mar 17$17.54, Feb 7 - Mar 3$0.41, Feb 7 10:51 pm$21.55, Jan 28 - Mar 17$17.54, Feb 7 - Mar 3$0.23, Feb 8 9:11 pm$21.55, Jan 28 - Mar 17$17.54, Feb 7 - Mar 3$0.01, Feb 10 - Mar 13$21.55, Jan 28 - Mar 17$17.53, Mar 5 10:20 pm$0.01, Feb 10 - Mar 13$21.55, Jan 28 - Mar 17$17.52, Mar 7 - Mar 13$0.01, Feb 10 - Mar 13$21.55, Jan 28 - Mar 17$17.51, Mar 15 - Apr 6$0.73, Mar 15 6:10 pm$21.55, Jan 28 - Mar 17$17.51, Mar 15 - Apr 6$0.01, Mar 17 - Mar 31$22.60, Mar 19 - Apr 23$17.51, Mar 15 - Apr 6$0.01, Mar 17 - Mar 31$22.60, Mar 19 - Apr 23$17.51, Apr 2 - Apr 6$17.51, Mar 15 - Apr 6$22.60, Mar 19 - Apr 23$22.59, Apr 9 9:02 am$22.39, Apr 9 9:02 am$22.60, Mar 19 - Apr 23$18.56, Apr 12 - Apr 17$18.56, Apr 12 - Apr 15$22.60, Mar 19 - Apr 23$18.56, Apr 12 - Apr 17$18.55, Apr 17 - Apr 23$22.60, Mar 19 - Apr 23$18.55, Apr 20 - Apr 23$18.55, Apr 17 - Apr 23$22.60, Apr 25 - Dec 28$18.52, Apr 25 11:41 pm$18.52, Apr 25 11:41 pm$22.60, Apr 25 - Dec 28$18.55, Apr 28 11:45 pm$18.55, Apr 28 11:45 pm$22.60, Apr 25 - Dec 28$18.54, May 1 6:50 pm$18.54, May 1 - May 7$22.60, Apr 25 - Dec 28$18.54, May 1 - May 7$16.34, May 4 - Jun 17$22.60, Apr 25 - Dec 28$18.53, May 11 - May 14$16.34, May 4 - Jun 17$22.60, Apr 25 - Dec 28$18.42, May 18 4:20 pm$16.34, May 4 - Jun 17$22.60, Apr 25 - Dec 28$18.22, May 22 8:52 pm$16.34, May 4 - Jun 17$22.60, Apr 25 - Dec 28$17.91, May 27 4:03 am$16.34, May 4 - Jun 17$22.60, Apr 25 - Dec 28$17.76, May 31 - Jun 5$16.34, May 4 - Jun 17$22.60, Apr 25 - Dec 28$17.56, Jun 9 2:57 pm$16.34, May 4 - Jun 17$22.60, Apr 25 - Dec 28$17.50, Jun 13 1:14 pm$16.34, May 4 - Jun 17$22.60, Apr 25 - Dec 28$17.16, Jun 17 5:55 am$16.34, May 4 - Jun 17$22.60, Apr 25 - Dec 28$17.08, Jun 21 1:17 am$16.74, Jun 21 - Jun 24$22.60, Apr 25 - Dec 28$17.04, Jun 24 7:34 pm$16.74, Jun 21 - Jun 24$22.60, Apr 25 - Dec 28$16.97, Jun 28 10:14 pm$16.88, Jun 28 10:14 pm$22.60, Apr 25 - Dec 28$16.81, Jul 3 1:02 am$16.78, Jul 3 1:02 am$22.60, Apr 25 - Dec 28$16.80, Jul 7 7:34 am$16.03, Jul 7 7:34 am$22.60, Apr 25 - Dec 28$16.53, Jul 12 7:14 pm$14.81, Jul 12 - Jul 20$22.60, Apr 25 - Dec 28$16.36, Jul 16 11:01 am$14.81, Jul 12 - Jul 20$22.60, Apr 25 - Dec 28$16.19, Jul 20 2:06 am$14.81, Jul 12 - Jul 20$22.60, Apr 25 - Dec 28$16.15, Jul 23 2:36 pm$16.00, Jul 23 - Jul 30$22.60, Apr 25 - Dec 28$16.16, Jul 27 4:06 am$16.00, Jul 23 - Jul 30$22.60, Apr 25 - Dec 28$16.15, Jul 30 6:04 pm$16.00, Jul 23 - Jul 30$22.60, Apr 25 - Dec 28$16.13, Aug 3 - Aug 6$13.06, Aug 3 7:52 am$22.60, Apr 25 - Dec 28$16.13, Aug 3 - Aug 6$13.50, Aug 6 - Aug 14$22.60, Apr 25 - Dec 28$16.12, Aug 10 - Aug 18$13.50, Aug 6 - Aug 14$22.60, Apr 25 - Dec 28$16.12, Aug 10 - Aug 18$11.00, Aug 18 - Aug 29$22.60, Apr 25 - Dec 28$16.13, Aug 22 1:52 am$11.00, Aug 18 - Aug 29$22.60, Apr 25 - Dec 28$16.12, Aug 25 - Sep 2$11.00, Aug 18 - Aug 29$22.60, Apr 25 - Dec 28$16.12, Aug 25 - Sep 2$8.50, Sep 2 - Sep 14$22.60, Apr 25 - Dec 28$16.09, Sep 6 - Sep 10$8.50, Sep 2 - Sep 14$22.60, Apr 25 - Dec 28$16.11, Sep 14 12:25 am$8.50, Sep 2 - Sep 14$22.60, Apr 25 - Dec 28$16.12, Sep 17 - Sep 21$6.00, Sep 17 - Sep 21$22.60, Apr 25 - Dec 28$16.10, Sep 25 - Sep 27$5.99, Sep 25 - Oct 5$22.60, Apr 25 - Dec 28$16.08, Oct 1 - Oct 5$5.99, Sep 25 - Oct 5$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$5.87, Oct 9 11:05 pm$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$5.73, Oct 13 10:51 pm$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$5.57, Oct 17 7:57 pm$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$5.23, Oct 21 5:53 pm$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$4.97, Oct 25 2:08 pm$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$4.85, Oct 29 12:58 pm$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$4.75, Nov 2 12:36 pm$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$4.64, Nov 6 3:49 pm$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$4.53, Nov 10 6:25 pm$22.60, Apr 25 - Dec 28$16.05, Oct 9 - Nov 14$4.42, Nov 14 8:19 pm$22.60, Apr 25 - Dec 28$16.03, Nov 19 - Nov 28$4.19, Nov 19 5:31 am$22.60, Apr 25 - Dec 28$16.03, Nov 19 - Nov 28$4.01, Nov 23 3:16 pm$22.60, Apr 25 - Dec 28$16.03, Nov 19 - Nov 28$3.89, Nov 28 5:50 am$22.60, Apr 25 - Dec 28$16.01, Dec 3 - Dec 13$3.13, Dec 3 2:50 am$22.60, Apr 25 - Dec 28$16.01, Dec 3 - Dec 13$2.38, Dec 8 12:24 am$22.60, Apr 25 - Dec 28$16.01, Dec 3 - Dec 13$2.15, Dec 13 2:47 am$22.60, Apr 25 - Dec 28$12.02, Dec 18 5:48 am$1.98, Dec 18 5:48 am$22.60, Apr 25 - Dec 28$16.01, Dec 23 - Dec 28$1.75, Dec 23 2:09 am$22.60, Apr 25 - Dec 28$16.01, Dec 23 - Dec 28$0.01, Dec 28 - Jan 21$23.94, Jan 2 - Jan 21$15.99, Jan 2 - Jan 6$0.01, Dec 28 - Jan 21$23.94, Jan 2 - Jan 21$15.97, Jan 11 8:22 pm$0.01, Dec 28 - Jan 21$23.94, Jan 2 - Jan 21$15.94, Jan 16 7:08 pm$0.01, Dec 28 - Jan 21$23.94, Jan 2 - Jan 21$15.99, Jan 21 7:47 pm$0.01, Dec 28 - Jan 21$22.60, Jan 26 - Mar 28$15.97, Jan 26 - Feb 11$0.16, Jan 26 9:41 pm$22.60, Jan 26 - Mar 28$15.97, Jan 26 - Feb 11$0.01, Jan 31 - Feb 6$22.60, Jan 26 - Mar 28$15.97, Jan 26 - Feb 11$2.99, Feb 11 2:38 am$26.66, Feb 16 10:41 am$22.60, Jan 26 - Mar 28$15.95, Feb 16 10:41 am$26.57, Feb 21 - Feb 24$22.60, Jan 26 - Mar 28$15.91, Feb 21 11:36 pm$26.57, Feb 21 - Feb 24$22.60, Jan 26 - Mar 28$15.90, Feb 24 6:47 pm$22.60, Jan 26 - Mar 28$15.84, Mar 5 - Mar 28$15.84, Mar 5 - Mar 28 143,6261,934,905 1,562,500 1,171,875 781,250 390,625 0 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr 2015 2016

Price Details

New

Latest $22.60 Mar 28, '16
Highest $23.94 Jan 2, '16
Lowest $20.34 Jan 9, '14
Average $22.60 (30d avg)
$22.99 (90d avg)
$22.78 (180d avg)
$22.69 (365d avg)
$21.73 (Lifetime average)
Added Jan 9, 2014

3rd Party New

Latest $15.84 Mar 28, '16
Highest $23.23 Jan 15, '15
Lowest $10.99 Jul 8, '14
Average $15.84 (30d avg)
$15.93 (90d avg)
$15.87 (180d avg)
$16.54 (365d avg)
$15.38 (Lifetime average)
Added Jan 9, 2014

3rd Party Used

Latest $15.84 Mar 28, '16
Highest $99.31 Aug 21, '14
Lowest $0.01 Jan 31, '16
Average $15.84 (30d avg)
$9.53 (90d avg)
$6.84 (180d avg)
$10.60 (365d avg)
$10.03 (Lifetime average)
Added Jan 9, 2014

Sales Rank

30 day average: 1,305,978
90 day average: 905,537

Product Description

Leonard da Vinci drew pictures of helicopters; Wilbur Wright said they would never work. But Igor Sikorsky proved him wrong, inventing the first working helicopter and building the company that still bears his name.

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