The cowl took most of the initial brunt force of the field overturn 2 years ago but was beautifully restored by Roger (Doggett) a master craftsman at Priory Farm.
The repair had involved beefing up and neatening my slightly squared openings i to more curved and streamlined affairs
This, in turn, had slightly unbalance the 1/3 to 2/3 intake to exit ratio for cooling.
Cooling is most definitely a black art ! But generally you start with intake hole surface area measures ..and then make sure your exit areas are twice that ..1/3 – 2/3
As they had altered ..and as I was so so keen to gly post the major repair .. I did what my good and decent engineer would do .. black gaffa tapped up the orifice, clear prop and flew !!
Now ..10 months on ..(ok thats a bit longer than it should have taken) .. ive changed to add a thin metal gurney style plate
The theory is, that the slight (and yet to be adjusted) lip on the metal creates a drop in pressure behind the plate and so aids the exit of air meaning your hols probably dont have to be so large !

Ive started with a very small bend .. as it just flat gaffa tape before !


Haven’t used the old metal cutters since the build. Useful to make some small backing plates for the heat resistant rubber flanges where small washers just aint up to the job.















































