The V-1 airlog propeller was a range-counting device. A preset number of revolutions provided an estimate of the distance traveled. When the number of revolutions of the propeller reached the number set by the launch crew, the device sent a signal that resulted in cutting off the pulsejet engine and putting the tail control surfaces into a dive configuration. It the system worked properly, the V-1 would go silent and fall at a steep angle on the target.

A US Army officer, James McFague, acquired this artifact during the invasion or occupation of Germany in 1945. Colin Donovan donated it to the Smithsonian in the name of his grandfather and father and will be installed on the Museum's V-1, A19600342000, during restoration..

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Country of Origin Germany Type CRAFT-Missile & Rocket Parts Dimensions 3-D: 17.8 × 20.3 × 6.3cm (7 × 8 × 2 1/2 in.)
 Materials Cardboard
Metal
Electrical Wiring
 Inventory Number A20220559000 Credit Line Gift of James J. McFague, James J. McFague III, and Colin Donovan Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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