The analysis I just did of the Revell SCB125 Essex kit vs the actual USS Yorktown CV10, whose general dimensions the kit should match exactly, revealed that the kit bow ahead of the forward gun sponson is far (66.2%) too short; the hull length forward needs to be extended by 1.01"  all of it forward of the sponson. Thus, a build accurized per our correction will not wind up in the nominal 1/542 scale (often rounded to 1/540) usually attributed to this kit. So what scale will a corrected build end up? Well, as usual there are several ways to answer this. A quick measurement of the flight deck (19.6")  calculated against the overall length (LOA), as listed by NavSource (899' for USS Yorktown)  indicates an actual kit scale of exactly 1/550 to begin with, but with our bow correction (+1.01" forward), that scale increases to 1/523. Now the above is based on length overall, which can be dicey because of minor changes  for example a bridlecatcher here, or a gun tub there, etc.  so that the far better way of pinning down scale based on length is to consider the waterline length. Indeed, Navsource lists the waterline length (WL) for all Essexes as unchanged  from 820' asbuilt  right through their radical conversions even to the SCB125 fits. Based on this dimension, the Revell kit starts out at 1/538 scale, but again with our bow correction ends up at 1/510. Meantime, as I've noted earlier a key consideration for most hull conversions is actually the beam  again, always measured at the waterline  and here the original Revell kit is erring in the other direction; with a waterline beam (1.95") scaling out to 1/622! Now this is for the beam an SCB125 Essex  101' in real life  which was significantly wider than the asbuilt WL beam of 93'. (I think Revell must have used this earlier beam measurement in designing their mold, as this would calculate out to 1/572 scale  which is at least back in the general ballpark with their target of 1/542.) In any case, the beam of the Revell kit needs to be widened (even before our bow correction) to match the scale based on length. With our bow correction, we are again faced with a choice of target scales: 1/523 based on LOA or 1/510 based on LWL. In this case I recommend splitting the difference  taking the average of the two  which comes out to 1/517 scale. Thus, I calculate and recommend that the keel requires the insertion of a 0.40" spacer plate along the centerline of the (singlepiece) hull; leaving the ends attached so they will naturally taper back together. I know this is a lot of plastic to jam in there. I have successfully inserted, on this very kit hull, a 0.30" spreader before  so I know that at least that much can be done. If more than 0.30" proves unfeasible (the other option being to build out the hull sides, as was done in the actual refits), then the resulting scale, based on the beam, will come out to 1/539. So, there you have it  the scale to which the Revell angleddeck Essex should be corrected is: 1/510 based on LWL; 1/523 based on LOA; or 1/517 based on the beam  take your pick  unless you can't swing the latter and have to settle for a beam of 1/539! Is the above about as clear as mud now? Oiy! Cheers, Matty 
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