Fan shroud extension R30/50 v1
Note: I have not found it necessary to do any such mod for the R30/50 v2/Titan

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 1. Using a plastic fuel jug
2. Using overhead transparency
I cut mine out of a plastic fuel jug
 
I then took out the two bottem screws that hold the servo tray in and the two front landing strut screws. Then slide the shroud extension in.

Make the top of the shroud extension match with the bottom edge of the built in fan shroud. Fold the shroud extension at the top so that the angle causes it to be parallel with the engine heat sink. With it in the right position, use a small drill bit to drill through the screw holes. You may then need to trim any excess pieces sticking out.
Make the glow plug hole large enough for your glow plug wrench to get in there.
Here you can see the top ear of the shroud extension is between the fram and the lower radio tray hole.
The shroud wraps around the side to keep the air flow close to the head.
I have tested a new "easy to find/use" material for the Fan shroud extension. I made it out of an overhead film aimed for use in laserprinters. It is heat resistant and thicker/stiffer than ordinary overheadfilm. I modified the design with a new 10 mm area above the upper 10mm parts. This new area is made as a tounge that is slotted into the narrow slit between the servo holder frame and the main frame.This stiffens up the shroud extension a good deal. The transparant overhead film is nearly not visible on the heli but does the job.
Carl-Olof Sandberg