Momentum-Impulse Balance and Parachute Inflation: Clusters

Decisive Roll of Filling Time on Classification of Parachute Types

“…Thus, the same result as mentioned previously can be deduced. In other words, because the mass ratio R m C D A 1:5 =m has the same order of magnitude for both parachutes, the shock reduction factor acquires approximately the same value for both cases [11,12].…”

“…Moreover, a comparison between Tables 2 and 4 shows that to theoretically halve the initial velocity (from 100 to 50 m=s) results in an approximately quarter reduction of the opening shock. This may be compared to a correlation used to calculate the opening shock as given by [6,7,10,12,[23][24][25][26][27][28][29] …”

“…The results showed how the higher altitude could produce larger opening forces in a parachute in relation to the mass ratios higher than zero, and that swifter opening leads to larger forces. He extended the method for parachute clusters in [12].…”

“…Thus, theoretical studies are motivated using experimental-based correlations to acquire force history [5][6][7][10][11][12][13][14][15][16][22][23][24][25][26][27][28][29][30][31][32]. In this direction, Berndt and Deweese [5] used parachute opening images to study filling time as well as the variation of canopy projected area.…”

“…Parachute experimental studies mainly have focused on either fullscale flight, including payload drop tests (e.g., [5][6][7][8][9][10][11][12][13][14][15][16]), or subscale wind tunnel investigations (e.g., [16][17][18][19][20][21][22][23]). Behr [8] carried out payload drop tests to study acceleration of a parachute system containing three T-10 reefed parachutes from an altitude as low as 100 m. The results showed that the peak of parachute opening forces occurs before its full opening takes place.…”