我這邊找到的資料可是很貴的: http://www.defenceweb.co.za/index.php?option=com_content&view=article&id=19918:denel-dynamics-considering-c-ram-&catid=50:Land&Itemid=105 裡面提到: Looking at 35mm, Viljoen noted the most widely used anti-aircraft gun systems in the western world are the 40mm Bofors and the 35mm Oerlikon guns. “The concept is to make specialised guided ammunition versions for these guns. As the 35mm shell is the most challenging in terms of size and the Rheinmetall Mantis system already exists to detect, track and do fire control on RAM threats, it is the logical choice to use this vehicle for the next guided shell.
“A tracking radar and datalink will have to be added to each gun. The warhead will contain heavy tungsten fragments that are optimized to destroy RAM warheads at a distance of 0.5m. Typical intercept speeds between the fragment and the RAM will be about 1500m/s. The warhead will be fuzed by a compact proximity fuze, similar to the one in the guided fuze. The unit cost per shell will be similar to that of the guided fuze unit, about US$5000. The addition of the tracking radar and datalink to each gun is estimated to add about US$10 million to the Mantis system for all eight guns.
“Viljoen notes the main shortcomings of current gun systems are: 1. The large amount of ammunition expenditure per kill (Centurion 300 rounds/threat, Mantis 35 rounds/threat) limits the number of threats that can be engaged before reloading to 5/gun for Centurion and 7-9/gun for Mantis. 2. Long dwell time (Centurion around 5s per threat, for Mantis around 3.5s per threat) during which the system is locked on to a single threat. 3. Short range (around 100-1000m) 4. Inability to counter threats at a high rate as a result of the long dwell time and relative short range. 5. Cost per single threat engagement (US$30-60 000) due to large ammunition expenditure. For Iron Dome the cost is reported to be around U$40 000 per missile.”