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8 minutes ago, Andrew D. the Jolly Rogers guy said:

What are the external differences between an F model Sparrow and an M?  Would it be the conduit running along the body?

The AIM-7M has 4 TDD Antennas, the AIM-7F only had two. Also, the arming keys on the rocket motor were different (due to different rocket motors) but for modeling purposes I wouldn't worry about that.

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Target Detection Device, aka proximity fuses

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Regarding the TDDs, the 4 that are on the M are in line with the fins of the missile while the 2 on the F are offset from the fins. 

 

Mark

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20 hours ago, Andrew D. the Jolly Rogers guy said:

Ok; and they both have the same conduit running down the length?  

Yes, the same conduit between the both.

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