I think it might be easier to fit a coaxial, wireless camera and then mark the screen with stadia lines similar to those used in the M72 LAW sights( but calibrated to an 18" wide tank.) http://www.globalsecurity.org/military/library/policy/army/fm/23-25/232500132.gif
On Sunday, 10 March 2013 21:33:27 UTC, Joe Sommer wrote: > > I recently ran some simulations of paintball ballistics to > assess the difficulty of using a laser rangefinder for fire > control in our tanks. Specifically, I wanted to check > sensing/control precision for gun elevation mechanisms. > > 1) There are now some relatively cheap laser rangefinders > with 100m capability and USB output. See eBay 300705075740 > for $156, Previously laser rangefinders for $100 were > available for hunting, golf and construction but units with > electronic output were over $600. I have no idea about > accuracy or visibility of the laser spot for these rangefinders. > Hopefully they also have an internal inclinometer. > > 2) You would need to build a gimbal for the laser rangefinder > with a coaxial video spotting scope that is independent of the > turret (because hulls are never level) and because you must > elevate the gun higher than the laser beam due to ballistic > drop of paintballs. > > 3) I attached a graph of gun elevation in degrees needed to hit > a target at ranges from 10 to 150 feet. The stars on the graph > show elevation angle to hit the target in the center. The > squares show elevation angle to hit six inches above the target > spot and the circles show elevation angle to hit six inches below > the target. These simulations include air drag on the paintball. > The green line is a simplistic model for a projectile with no air > drag. > > For range up to 50 feet, you have about 1.1 degree error margin > to hit a 12 inch tall target and air drag is not very important. > At 50 feet, paintball velocity has dropped to 200 fps from > muzzle velocity of 280 fps. > > Beyond 50 feet, air drag must be considered. At range of 100 > feet you only have about 0.5 degree error margin to hit a 12 inch > tall target, paintball velocity has dropped to 144 fps and the > zero drag model will shoot about a foot too low. > > 4) Inclinometer or accelerometer chips can measure gun elevation > angle with digital precision of 0.035 degrees which should be > sufficient. However gun elevation control must be capable of at > least 0.25 degree mechanical precision to hit a 12 inch tall target > at range of 100 feet. > > Joe > > -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to rctankcombat+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
