TOPIC NUMBER: A02-218 TITLE: Development of Ballistic Resistant Airless 20 Inch Wheels for the Interim Armored Vehicle (IAV) and Future Combat Systems (FCS) REFERENCE INFORMATION: - Ref #1: *** AVAILABLE ONLY TO DTIC REGISTERED GOVERNMENT EMPLOYEES AND/OR GOVERNMENT CONTRACTORS *** Available for purchase from DTIC as ADB216840. Distribution authorized to U.S. Gov't. agencies only; Critical Technology. Other requests shall be referred. This document contains export-controlled technical data. - Ref #2: *** AVAILABLE ONLY TO DTIC REGISTERED GOVERNMENT EMPLOYEES AND/OR GOVERNMENT CONTRACTORS *** Available for purchase from DTIC as ADB238472. Distribution authorized to U.S. Gov't. agencies only; Critical Technology. Other requests shall be referred. This document contains export-controlled technical data. - Ref #4: Available from Society of Automotive Engineers, www.sae.org or 1-877-606-7323. This item may also be available at your local library or through interlibrary loan. - Ref #5: Bad link. It looks like only 2002 and 2001 are on the web site. 2000 was probably removed as "old". Other links are still good. Q: 1) What are the ideal tire dimensions that are acceptable - overall diameter, overall width, static loaded radius, etc. of this 20 inch tire? 2) How many tires per vehicle? 3) Max load per tire? Is the load requirement uniform in every position or are there differences in load requirements depending on the tire position on the vehicle? 4) Are there any weight limits per tire and wheel assembly? 5) Assuming that there are 6 tires on a vehicle, please advise what the speed and distance will be required if: 1 tire is shot out? 2 tires are shot out on the same side of the vehicle? 3 tires are shot out on the same side of the vehicle? Or if all 6 tires are shot out? A: 1) Overall diameter is 44 inches, width is 12.2 inches, loaded radius of 20.7 inches. 2) Eight wheels. 3) Please go to Michelin's website for load and pressure, link as follows: http://truckus.webmichelin.com/tires/18/loadandpressure.html 4) Weight reduction is critical to all army systems. The lower the weight, the more appealing the proposal. The weight of a Michelin 11.00R16 military tire assembly weighs approximately 222 lbs. Technical information may be found at the following link: http://truckus.webmichelin.com/tires/17/specs.html The XL tire width is 10.9 inches and overall diameter is 38.7 inches and the XML tire diameter is 44 inches and width is 12.2 inches. From this information I estimate that the XML tire assembly is approximately 280 lbs (taking into account the XL tire is mounted on a steel rim and the XML tire is mounted on an aluminum rim. I will contact the PM for this specific information. 5) This is the distance a tire can travel damaged before maintenance is required. Worst case scenario will be all four tires shot out on one side. Run-Flat Capability: 150 miles at 50 miles per hour Ballistic Capability against the following ballistic threats 0.44lb PMN mine 75 miles at 50 miles per hour 30 mm HE round 75 miles at 50 miles per hour 30 mm KE round 75 miles at 50 miles per hour M74 Bomblet 75 miles at 50 miles per hour One more critical aspect of the current system is that tires & CTIS system allow for raising and lowering the vehicle by adjusting the air pressure. This is sometimes critical in transporting the system and something participants may wish to address in their proposal submission. Q: I would like to know if there is a "buy American" restriction. I represent an Israel-based client that has developed the technology that meets the requirements for the solicitation. A: I know of no Buy American restrictions. Q: Does TACOM have stiffness and damping characterization data for the current IAV pneumatic tire that would be available upon award? If not, can TACOM provide a wheel and tire combination for testing upon award? A: The dampening and stiffness characteristics are Proprietary to Michelin, Michelin 12.00R20 XML, and cannot be supplied to competitors. PM-BCT will need to supply the requested items; wheel, run-flat insert, and tire. Since I work for the Program Manager's Office for Light Armored Vehicles I cannot speak for the BCT/IAV folks but I would like to think that they will cooperate with these types of requests. Q: From the information we have learned, we would like to suggest the following: 1. A radial "All Purpose" traction tread tire which would be capable of carrying 5000 lbs. at 58 psi. 2. The dimensions of these tires are: Overall Width: 12.8" Overall Diameter: 41.0" SLR: 18.6" Carrying Capacity at 65MPH is 5000 lbs at 58 psi On 8 tires this totals a load capability of 40,000 lbs. 3. The tire weight with the appropriate protector from ballistic threats and wheel would be approximately 360 - 400 lbs. for the complete assembly. 4. We believe that the tires would have the "run flat" capability of traveling 150 miles at 50MPH. Please confirm to us that the tire dimensions and carrying capacities note at 58 psi would be acceptable. Also confirm that the total weight would also be okay. Please note that an indoor wheel test could be done that would definitely demonstrate the capability of traveling the 150 miles at 50MPH without air. If the wheel test proves out, we would be willing to produce sample assemblies for prototype testing. A: 1) The max tire load for the Michelin XML 12.00R20 tires used on the Stryker (IAV) is 7165 lbs per tire at a PSI of 105. Please see the link below to Michelin's website: http://www.michelin-us.com/us/eng/tire/truck/tires/pdf/xml.pdf 2) The Michelin XML tire used on the Stryker (IAV) has the following characteristics: - The dimensions of these tires are: Overall Width: 12.2" Overall Diameter: 44.5" Load radius: 20.7" Max tire Load at 62 MPH is 7165 lbs at 105 psi - The weight of the Stryker is ~ 37,000 - 38,000 lbs. 3) The complete assembly should not weigh more than 300 lbs (this does not include CTIS hardware). The lower the weight the better. 4) The tires sould have the "run flat" capability of traveling 150 miles at 50MPH. However, as the SBIR states, the current capability is 30 miles at 30 MPH at run-flat state. A participant must beat this capability to be considered. The goal is for the Stryker to be able to travel 150 miles at 50 MPH in run-flat condition. The max speed of the vehicle is 62 mph, so any improvement over 62 mph will have minimal or no impact. Q: We have a new more practical and feasible CTIS design. This CTIS would work with existing tire-wheel assemblies for the IAV in addition to any and all proposed airless tire-wheel concepts proposed for the IAV. We would like to know if our proposal would be considered for Phase I funding without proposing an airless tire-wheel prototypes? A: I need more detail of the proposal objectives to make a statement (saves weight, lower cost, more survivable, etc). I will say one thing, weight is critical. If you can save weight, your concept may have merit. I left a message at the Help Desk (866)724-7457 regarding the possibility of combining your proposal to another proposal to make an optimal proposal. You may wish to contact the Help Desk yourself. It would be simpler to include a tire/wheel design that would enhance the survivability. Q: 1) The tire that we now have available has dimensions noted in my previous query, i.e.: 41.0" OD 12.8" OW SLR 18.6" Since the carrying capacity needed is sufficient with this tire would it be considered or must it conform to the pre-selected 1200R20 XML? 2) The weight we now have for our "run flat system" is about 375 lbs.. If the performance of our tire & wheel "run flat system" is truly proven to do 50 mph for 150 miles, would the current tire we have be acceptable for this vehicle? Alternatively, would a new tire with the exact dimensions of the 1200R20 XML be required? If it would, it of course would be heavier. 3) Please advise the quantities of tires and wheels of the "run flat system" that are projected to be required over the near term and long term? We want to make sure we have the capability to meet the needs, if our "run flat system" proves to be of interest. 4) Would you like us to perform a preliminary indoor wheel test that would prove definitely that our "run flat system" on our current tire would do 50 mph for 150 miles? Please advise and confirm your thoughts reference this test. A: See answers above.