WW2 USAAF K-13 Aircraft Compensating Gunsight – B-17 B-24 Bombers – VERY NICE


Out of stock


You are bidding on a SUPERB example of a WW2 USAAF K-13 Compensating Gunsight!  This gunsight was used specifically in waist/side gunner positions of various bomber aircraft, such as the B-17 Flying Fortress and B-24 Liberator!


Made by Sperry, the K-13 Compensating Gunsight, is pneumatically-powered, designed to compensate for altitude and airspeed.  Typically mounted on the rear housing of a 50 cal machine gun from a side/waist gun position in the aircraft.  It was a late war innovation that used the aircraft altitude and speed with the direct correlation of where the weapon was pointed to calculate the reticle. The aircraft altitude and speed was programmed on the rear of the sight. The correlation was determined by drive lines that connected the K-13 Sight to the K-7 Mount.  A compensating sight offsets the line of sight only to compensate for the speed of the firing aircraft.   These sights do not take into account target range, but base their calculation on the angle between the gun line and the aircraft axi.  In these sights the full compensation for own speed is only applied when set to the STRAFE position.  In all other situations only a fraction (about 65%) of the full compensation is applied, because in a pursuit curve the attacking aircraft’s speed has a component in the direction of the target’s flight. 

Made of aluminum steel, and glass, and dating around 1944, this is an AMAZING used example.  Though there are some light scratches and wear from storage, it retains 98% of it’s original finish with the original bulb!  All the glass is original to this sight, and includes the flip up sun shield so that the pilot could see easier when flying in brighter light.  The data plate is 100% intact, and clearly indicates the model and type.  The fixed cross hair is 100% intact and functions well, but it is stiff, as there is a light bend.  A bit of dust and dirt from storage, but that can easily be rectified by the winning bidder.  I have shown its location in the last photo.  Would make an EXCELLENT addition to any collection, display, or simply as a conversation piece!

 Please email me if you need additional photos or information.


——————- PAYMENT —————–

Payment should be made within 7 business days at the end of the auction unless buyer contacts me for other arrangements. I accept all forms of payment.

 ——————- SHIPPING —————–

My goal is to ship within 7 days from auction end. However, depending on circumstances, it may take up to an additional 1 week from receipt of confirmed payment. If you need it shipped sooner, please let me know and I will do our best to accommodate.


——————- TERMS OF SALE —————–

Most of my items are vintage, and as such are AS-IS, so you must therefore expect a degree of wear due to age and/or usage. I will describe each auction to the best of my knowledge and take as many photos necessary to ensure you are pleased upon receiving your item. All sales are final, so please make sure your questions are answered to your satisfaction before you purchase.

——————- ABOUT ME —————–

Although my passion is the Me109, I do offer many other German Aircraft (Fw190, Me262, etc.), as well as USAF and Japanese items. Occasionally I do offer many non-vintage items such as prints and art relating to the time period. As a private collector myself, I am constantly on the lookout for historical memorabilia, authentic photographs, artwork or anything unique relating to military aircraft.


——————- COPYRIGHT —————–

All pictures and descriptions used in my auctions under COPYRIGHT and I forbid the use of these photos and information in any manner such as paper or electronic (internet) publications or otherwise. Use is solely based on my authorization only.