Weapons Impact Scoring Set Portable Retractable Tower

Request for information for Weapons Impact Scoring Set Portable Retractable Tower - Request for Information . Please provide Photos and refer to attached PDFs for further information. Response to RFI questions are as follows: Q: Will the questions be answered before the response is due. A: Yes Q: #12: (2) Total sections require the section to be approx. 32' to have at a 4' overlap, or the use of a mast with (2) 30' sections. An unguided system with a 6' mast will generate a lot of deflection and sway. What are the accuracy requirements? Deflection? Sway? At Operational Wind speed? Survival Wind speed? A: #12 Operation Maximum deflection of 0.1 degree at 30MPH wind with 300 pound payload and surface area of 20 square feet. Minimum survival wind speed of 70MPH. Q: #18: 300 +? Or should this read a max payload up to 300 lbs.? What does 300+ mean as it could be 1000. A: #18: Payload shall be minimum of 300 pounds. Q: #19 We would offer a superior design containing continuous interlocking capabilities by each tower leg supported by our version of slide radial rods that extend the entire length of every tower leg. The radial pressure slide bar system described on No. 19 of the RFI requirements provides contact to only one side of the tower top section and only the last 5ft of the tower section. I would like to see evidence that supports the statement on the requirement that radial pressure slide bar system eliminates the use of guy wires and provides greater tower stability. Such statement should be supported by test results and analysis. We will gladly provide analysis and destructive test results to support our tower's capabilities. Please read carefully our comments below on a, b, and c. (Q19a)We recommend removing this requirement from the SOW. Testing showed that this type of system exerts an outward force on the rungs to which the bars are mounted (100 psi or more depending on tolerances, plumbness, etc. This is in the static (not under wind load) condition.) With a preload on the rungs, causing deflections in the beam, it was found to reduce the rung FOS by a factor of 3. (Q19b)Lastly, it was found that the fatigue cycling on these rungs as a result of the zero-based oscillatory wind loading and sway of an unguyed aluminum system reduced the strength of the rungs even more. Combine these structural and design deficiencies with the yield strength reduction from the contiguous HAZ (Heat Affected Zone) of the weld and the radial slide bars become the system's weak link. (Q19c)Our design puts the contact in the legs and along the entire length of the legs. Instead of reducing the Euler buckling capacity we maintain it. To ensure structural superiority throughout the tower we do not weld to load carrying members. If welding needs to be performed on any subcomponent parts, the necessary heat treatment to normalize the weld is performed to return the material to its normal strength. A: #19 a, b, c: As long as requirements #42 and #43 are met, an alternative can be considered. Q: #20: Due to welding reducing the yield strength (by 1/3) of the structure in the 1"-3" proximity of the weld (Heat Affected Zone, HAZ), we would opt for a substructure that can be welded to a bracket that is riveted or bolted to the superstructure. This substructure would obviously be heat treated to regain most of its yield strength characteristics throughout. A: #20: The two mounting brackets for the cable track can be bolted on the tower as long as it is fixed for the lifetime of the tower. Q: #34: What are these for? A: #34: These are for moving a substructures that will be built and installed separately on the trailer deck after the delivery of the trailers. Q: #37: Again, due to the substantial strength reduction welding would cause, we would recommend bolting or riveting a heat treated substructure. A: #37: Bolting on these mounting bars should be fine. Q: #39: Our leg design provides a 1.75" cable guide built into the leg. Do we need to add an additional pipe or will our leg design suffice? Q: #39: The cables will be installed in cable track and cannot utilize the built-in cable guide as suggested. Additional questions: Q 1: Operational wind speed A: 30MPH Q 2: Survival Wind Speed A: 70MPH Q 3: Deflection at Op Wind Speed (inches) A: 1.26" for 720" tower length @ 30MPH wind Q 4: EPA/Sail Area (max) A: 20 square feet Q 5: Structure Class (ref TIA-222G) A: Unknown Q 6: Topographical Category (ref TIA-222G) A: Various, TBD Q 6: Exposure Category (ref TIA-222G) A: Exposure Cat C Q 7: Clarification on max payload weight A: Minimum 300 pounds Q 8: PE License Stamp required upon delivery A: If this is a standard process Q 9: Gross vehicle weight A: 14,000 pounds