The 9x3.8 SF was a bit of an improvement but not enough to float my boat.
The problem is the motor. It ain't up to the job, so why persist with a 4 banger when you can shoehorn in V8.
In this case the V8 is a Turnigy 1320kv Park480. I had one kicking around from an earlier project and liked the way it performed with a 9x6 prop.
The problem was cramming its large diameter in to the narrow nose of the Ryan.
Solution was to mount it a little lower and perform some foam surgery on the cowl.
An X mount was fabbed from aluminium and screwed to the existed firewall (with previously installed backup ply).
Cg is now at 42mm with the battery furthest forward.
Prop is a 9x6 apc with a spinner from my T28 fun fighter.
Draws about 27A static so the original speedie should be ok.
Thrust, 900g on a half charged battery.
Should be enough