# August 26, 1951 — Larson AFB, WA — Two Radars Track 900 MPH Target

**URL:** https://uapdiscovery.discourse.group/t/august-26-1951-larson-afb-wa-two-radars-track-900-mph-target/307
**Category:** Blue Book Unknowns
**Created:** [August 26, 2025, 12:17am UTC](https://uapdiscovery.discourse.group/t/august-26-1951-larson-afb-wa-two-radars-track-900-mph-target/307 "2025-08-26T00:17:56Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![jeffknox](https://avatars.discourse-cdn.com/v4/letter/j/e47c2d/32.png) [@jeffknox](https://uapdiscovery.discourse.group/u/jeffknox)
#### Post date: [August 26, 2025, 12:17am UTC](https://uapdiscovery.discourse.group/t/august-26-1951-larson-afb-wa-two-radars-track-900-mph-target/307/1 "2025-08-26T00:17:56Z")

</div>

![08261951-LarsonAFBWA-AN-CPS-1_MEW](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/3/30d1f2789381c4188934e3cbac089b5a31c27918.jpeg)

 ![08261951-LarsonAFBWA-AN-CPS-4-KeesleyAFB](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/8/88a522a598d8d6591e18b29a9c2654bb55152200.jpeg)

August 26, 1951 — Larson AFB, WA  
8:28 p.m. A radar station at Larson AFB [now Grant County International Airport], near Moses Lake, Washington, tracks a UFO at 13,000 feet going 950 mph on two different sets, AN/CPS-1 and AN/CPS-4, for about 6 minutes.

 ![08261951-LarsonAFBWA-F-86_Sabre_hertiage_flight](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/9/9ce8db5ba0d31d5ab11025fa7969cba577413cbc.jpeg)

An F-86 is scrambled, but radar contact is lost before the plane gets off the ground. An electronic signal is received from this object that appears to be a mode-one IFF response from an AN/APX-6 transponder.

 ![08261951-LarsonAFBWA-avenger_apx6](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/0/01ef63e0fd32248d4a893a5cdafa2f2b0950e9a7.jpeg)

This response is received twice at approximately 115 miles and 80 miles from the radar station. [Eberhart]

Record Card:

 ![08261951-LarsonAFBWA-BB-Card](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/e/eac1d93a4d6162b3f9d4ce80155f3225104ebcb0.jpeg)

AF-112:

 ![08261951-LarsonAFBWA-BB-AF112-1](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/b/b835c3925d670fa9b803c0f0dfe0b5f967593dd9.jpeg)

 ![08261951-LarsonAFBWA-BB-AF112-2](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/f/f0f1ab5c0ce501dc210555f8961f6a796d1de6d4.jpeg)

Status Report 1:

 ![08261951-LarsonAFBWA-BB-StatusReport1](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/5/509034fb48ec646f95b018af9621988356db2020.jpeg)

Sources:  
Edward Ruppelt, The Report on Unidentified Flying Objects, pp. 96–98, 108–109;

 ![08261951-LarsonAFBWA-Ruppelt-p96](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/0/02856417f5840d61bfc1c6c2c5aee8194e8295b8.jpeg)

 ![08261951-LarsonAFBWA-Ruppelt-p97](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/4/441acfbd277315589fb3560d9510a17770e8ded7.jpeg)

 ![08261951-LarsonAFBWA-Ruppelt-p98](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/d/d7f61e30b40d152cca9883ac981b7f1453610464.jpeg)

 ![08261951-LarsonAFBWA-Ruppelt-p108](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/6/65bc92f6c98fdcf6e92f64a2b0ab7c46829f6481.png)

 ![08261951-LarsonAFBWA-Ruppelt-p109](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/d/d4a8f53008255a3f7643ba42e70cd990e5a1dcbe.jpeg)

Brad Sparks, Blue Books Unknowns Catalogue, Case 466, p. 108;

 ![08261951-LarsonAFBWA-Sparks-Case466-p108](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/a/ada2859788ffcaca9c66eeda8bcbbf301d16ea20.png)

Jerome Clark, The UFO Encyclopedia, 3rd Ed., p. 692;  
Jerome Clark, The UFO Encyclopedia, 4th Ed., p. 767;

 ![08261951-LarsonAFBWA-ClarkIII-p692](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/8/878f94abff22f4b220f9160552f3feb688163c1e.png)

NICAP, “Two Radars Track 900 MPH Target;

 ![08261951-LarsonAFBWA-NICAPWebsite](https://canada1.discourse-cdn.com/flex011/uploads/uapdiscovery/original/2X/1/1344580bc23dfb04b791c8053fcdaa5cf7f88d13.jpeg)

> **[UFO Report](http://www.nicap.org/510826larson_dir.htm)**