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Show RANGE CARD COMPARISON BETWEEN TWO- AND THREE- POUND FINNED PROJECTILES Most of the control firing with the avalauncher done at Berthoud Pass is accomplished by using the standard 2- pound finned projectile. At times during the winter when heavy deposition takes place it is felt that another pound of high explosive would give a more positive answer. The range cards that have been worked up for this projectile have been used by myself and a new launcher crew with amazing accuracy. During the latter part of the winter several control missions were fired using a 3- pound charge which can be fired just as accurately and with as much reliability as a 2- pounder. When the 3- pounder leaves the launcher muzzle visual tracking indicates that it wobbles more than the 2- pounder. However, at a distance of about 100 yards out of the muzzle the wobble disappears and flight characteristics seem to be as good as the standard charge. During high broadside wind conditions the projectile appears to fly with a slight list. The fin assembly, offering more wind surface, seems to be blown further off line of travel than the forward end of the projectile. However, thetotal wind drift of the 3- pound projectile appears to be less than the 2- pound projectile. These flight characteristics have been made by observation only. Below are reproduced the two range cards which are used for control missions at Berthoud Pass.. Gun position is the same for both. Impact area is about the same for all projectiles. These data do not allow for windy conditions. |
