1 4 . > Q: ' . a a _| : ’ For the Navajo shot will the mirrors be on Bikini Island? Possibly. Project 5.10 - In-Flight Missile Vulnerability Test - M. L. Devol - WADC Project 5.10 is complimentary to the one which Lt Cosenza just described, the objective being to determine the thermal and mechanical effects an intercontinental ballistic missile or any other missile might encounter at the fireball. The objective is to fire a salvo or a couple of salvos of missiles through the fireball - not directly through the center but off-center. They should etrike the fireball, preferably a little before and a little after the time of breakaway. These missiles will travel at a speed of between 7000 and 10,000 feet per second; therefore, will be somewhat comparable to what a missile might travel. The missiles themselves are the hypersonic test vehicle developed by the Air Physics Development Corporation and for those of you who are not familiar with it, it is made up of a number of Loki rockets with Loki's about 12" in diameter and 5' long. A cluster of seven of them will make up the first or booster stage. The second stage may be like that or may be smaller, maybe four. Then in front of the second stage will be what we call the payload. The operation, we think, will look something like this: We are thinking of @ tower shot, preferably the Erie shot, partly because we would like to have direct correlation with Project 5.9. We set up our launching platforms about 3500 or 4000 feet away from the fireball which could be on the end of Runit Island. We fire one stage, fire the second stage, and just after the burn-out of the second stage, that is the time we wish to enter the fireball. We have talked with the photographic people about taking pictures before entry and after leaving the fireball and they thought they could take the pictures that we needed. The point will be buoyant and we expect to locate it. The system we have been using in New Mexico with a radioactive source is so good that we think it is the best means for recovery. From the photography we will have data on trajectory. Also, recovery will give us additional confirmation of that. We expect to make this of different materials and provide inserts of different materials, the same materials in many cases that are used in Project 5.9 so that we have a direct comparison of the differences in running through the fireball at 7-10,000' per second, and in just having t:e fireball hit it. We have been using @ recorder in our tests, one which was mentioned by Lt Cosenza, for measuring temperatures. We will try in this test to measure temperatures in the wall of the head and also to get some measurements of pressure and acceleration. The recorder will withstand the hard accelerations involved, and we hope we can take care of temperatures. It may be influenced by radiation in a way which we cannot predict before the test. So we are planning to back this up as much as possible with instru- mentation of the type of a couple of items that Lt Cosenza mentioned whichwill seca— eee * wee