Sunday, April 20, 2014

Shooting 2500 Yards 1.43 miles 2.3km

"A few days ago I took out the 338 Lapua and attempted the 2500 yard shot. So I placed the target at 2530 yards or 1.43 miles away, at that distance the bullet flight time is almost 4.5 seconds! Made a short video that I think you guys will enjoy. I went out early in the morning to beat the mirage, luckly there was very little wind around 3-4 mph coming from the left, I dialed 2.6 mils Left. I had to dialed the maximum elevation my scope (Nightforce NXS 5.5-22x56 MIL/MIL) had at 27.4 mils then held over 2.5 mils on the reticle to get me to 29.9 mils."

Thursday, February 27, 2014

Rocket Sled Parachute Design Verification - The best video of the year

A prototype Mars parachute is pulled from the sky with a rocket sled. The test applies the correct aerodynamic force to a parachute that is too large to fit in any existing wind tunnel.

The successful test approach allows engineers to study issues and improve parachute design.

MH-60S Knighthawk Helicopter, 4000 ft Drop Altitude
135,000 lb Sled
100,000 lbf of Pull
Thrust 50,000 lb
Tripod Structure 2,000,000 lb Concrete Anchors
300 hp Winch to Fish in Parachute
2600 ft 1-5/8" Technora® Rope (produced by Samson) 2000 lb Pulley

JPL clearance number: CL#14-0516 NAWCWD clearance number: 13-0171

World's longest slinky?