BS_w

MH 809 shows narrow blister and enlarged horn elevator, it's probably the case for MH 883

the front ring was the exhaust collector made in stainless steel

this airplane( 49 white) are probably an N-1, look at under the frame of sliding canopy, if it was a N-1 we could see the canopy frame inclined forward and the 30" dia, wheel (from N-5 dia was 27"); The digits read are 2..4..00", so the serial could be 42-104500 or 104600 (104700 & 800 were allocated to NZ & RAF) N-1= 42-104429 up to 104829) and 104900 was FT937.(N-5) the standard camouflage since 43 for Curtiss P40s was 41/43 + 42 fringes.

two drawings(Mk VII & IX) show there is not a joint at the front but at the rear. At the front there is a stiffener at inner side. may be the riveting along this stiffener creates a slightly depression which gives a discontinuity of the outline? a third drawing shows Mk XI top cowling and refer to Mk VII drawing. I think as Mk VII, VIII, IX & XI had sames engines, the top cowling is identical except some cutout for access doors? Mk VII (35138) Mk IX(36138), "7, except where otherwise shown this panel(top cowling) is identical with 35138"

Glenn Martin 167 F had three tanks only, 2 wing tanks and 1 fuselage tank

pic from C635 technical manual the interior surfaces are probably the same colour as frame of seat, blue grey

correct, I'm mistake

layouts of C wing(black lines) vs 20mm Mk IX(red lines) The 20mm barrels are not at same place. note also the location of .303, between ribs 12/13 on MkVc, and 13/14 on Mk IX. two versions of Mk IX wings

I proceed as you made, the drawing was traced at a (1/2?)scale, I resize to full scale(knowing the offset of guns 2 & 3) and the measurement give 1.25" for the radius = 2.5" dia The thickness of the gun tunnel would be .03" as indicated

you can add this detail (drawing 30062/sheet 1 "arranegment of gun installation")

to be exact, the height above datum line is gun 1: 1" gun 2: 0.9" gun 3: 1" gun 4: 1.2"

1.5R or 3D is near 2.5D,

drawing 30008 "nose covering bottom sheet", page 48 unfortunately it's not easy to read. When you wrote 2.5", is this diameter or radius?

it seems that the holes in leading edge is 1.5" R

habitually this rear view mirror was at the top of windshield(razorback, B, C up to D25))

technical drawing 17.12.1939, Mk I & II Blue: starboard side

on british H81A & H87A, RAF roundel applied at factory on upper wing had not standard ratio red/blue (2/5) but 15"3/4 red and 47" blue. The red disc is smaller. white dot lines show 18.8 diameter(2/5 of 47") red lines show the standard diameter

In "handbook of instruction on the service & maintenance of the H-81A airplanes" destined to RAF Tomahawk, it was wrote : propeller, blades, drawing 614-C0-1.5 and pictures show these blade prop. The entire propeller could be replaced by 89301 prop on late a/c As you wrote, at scale model no difference...

another detail not easy to see, the propeller on british aircraft H81(& P40, P40G) had steel blades, slightly narrower than aluminium blades of US P40B & C

despite Flying tiger airplanes was P40B, the designation was stencilled on the fuselage, Pitot antenna was cranked and port aileron had single tab as for H81

Externally, , the Model C had an belly shackle - US P40B & C had a recessed electric trim on the port aileron however british H81 had a single tab protruded the aileron trailing edge(identical as starboard) - The Pitot antenna was cranked on british airplanes and straight on US models. - armor glass behind the windshield was straight on british a/c and slightly sideways inclined on US models - H81 had british optical gunsight, and US had N2A illuminator screwed on the floor and reflector screwed into the windshield

.... like this?....

HTH as we can see, the glass of optical gunsight was hanged behind the armor glass, not screwed on windshield as for Army P40B C

you can't compare the dark earth 71-009 used for temperate land scheme(009/013) with the dark earth 71-035 used for desert scheme(035/069) these paints were applied at factory on E-1 and K