Didn’t the Buchon have a different tail to deal with the Merlin up front?

The DB605 and RR Merlin are both right hand tractor engines, ie rotate clockwise when aft looking forward. The Hispano-Suiza 12Z engine fitted to the early HA-1112-K1Ls rotated in the opposite direction, ie counter-clockwise, aft looking forward. The fin is indeed cambered to correct for torque factor on the Bf109 and this did cause a problem with the initial HA-1112-K1Ls, as it was cambered the wrong way. The Spaniards corrected this by producing tail sections cambered in the opposite direction for the Hispano engine installation and I believe some of these were fitted on some of the surviving Merlin powered Buchons, giving them a nasty reputation. I do remember reading somewhere in relatively recent times of a tail section being completely rebuilt to have the fin cambered to match the Merlin engine installation.
A photo stolen from Wikipedia illustrates the Hispano-Suiza installation.

I nearly had heart failure reading the title of this thread as well! 🙂

A superb effort with the Renault Engineman! It really does look the part.
I am looking forward to seeing the fruits of your labour an the next project, the J.A.P. 🙂

P&P, I think the biggest problem you are going to have is getting someone to sign off a repair scheme. For engine rebuilds and repairs, one usually has to rely on the manufacturer’s data. If you had a number of identical engines and or components to repair, it would be feasible, but one offs, not so.
For example, there is a large amount of data (ie repair schemes) for the Rolls Royce Merlin series of engines, published by Rolls Royce and also other individuals/companies. This is helped by the relatively large number of these engines still in operation. Unfortunately, the threat of legal liability makes approval of repair schemes that much harder.

Excellent Sunbeam! 🙂

While we are here, does anyone have a manual that covers the Claudel-Hobson RRCH Carburetor?

That ASI would look really good in an Avro Avian… 🙂

Excellent photos ErrolC! I’ll have to get myself there sometime to one of these shows.