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# P-40 Tomahawk Mk.IIA and IIB Differences
- URL: https://ipmscanada.ghost.io/p-40-tomahawk-mk-iia-and-iib-differences/
- Published: 2003-11-28T05:07:23.000Z
- Updated: 2026-09-30T01:48:04.000Z
- Author: IPMS Canada
- Tags: Aircraft References, #wp-import

**Wayne B.** 
**Differences between Tomahawk Mk IIA and IIB**  
Sun Dec 28 18:49:14 2003  
Can anyone enlighten me as to what the external differences were (if any) between the Tomahawk Mk IIA and the Mk IIB.  
Also, does anyone know if the Mk IIA was operated by RCAF squadrons.

**TC** 
**The differences were internal**  
Sun Dec 28 19:37:41 2003  
You can’t tell the difference between the two, other than sub-type of engine and other technical details. This is not something you have to worry about.

**Tom** 
**RCAF P-40s**  
Sun Dec 28 19:56:55 2003  
Several RCAF squadrons used the Kittyhawk Mk.IA and Mk.III (P-40Ks and Ms both had the designation Mk.III) for home defence. Squadrons were (and I hope I get them all) 14, 111, 118, 132, 133, and 135.

**Scott Hemsley** 
**RCAF Tomahawks**  
Sun Dec 28 20:36:37 2003  
According to the book, “RCAF Squadrons and Aircraft” (S.Kostenuk/J. Griffin, all RCAF operated Tomahawks appear to have be exclusively used overseas. Kittyhawks were used in Canada for home defence.  
Anyway, only the following RCAF (overseas) sqns. are identified as operating the Tomahawk:  
400 Sqn. – Tomahawk Mk.I, IIA & IIB; Apr.41 – Jul.42 ‘SP’ codes, sample s/n: AH789 (L), AH824 (F), AH831 (N),AH841 (K), AH862 (J), AH895 (B), AK324 (S) AK481 (S), AK484 (Y), AK528 (B)  
An in-flight photo, identified as Mk.I’s shows AH785 (S) and AH806 (W).  
403 Sqn. – Tomahawk Mk.I & IIA; Mar. – Jun.41 ‘KH’ codes, sample s/n: AK878 (H), AH896 (H), AH882 (R), AH(?)871 (G).  
The latter 3 are identified as Mk.IIA and appear in an in-flight photo, from the starboard side. ‘G’, even though in the foreground, has the letters of the s/n aft of the ‘Sky’ fuselage band.

source: [Hyperscale](http://www.hyperscale.com/?ref=ipmscanada.ghost.io)  
(thanks to Brett Green for permission)