What I did was found some cheaper 4 blade props to get idea on the pitch and then got set of 5 blades to help it get on plan

Raised the engine 1 1/8 th inch and added -3 IMCO shorties.
Getting on plane with 4 blade Bravo props was impossible without a little Tinkering.
No problems now at all.
I am running a 26 Daytona that only weighs 4500 lbs.

what boat did you do the conversion in?

There is a thread in the Velocity section where a Velocity 390 is be converted from XR to Arneson.

Padraig

I thought BBlades use to have a testing program. I did not use them and what worked best were 18x31-18. My first set of Herrings are my back up.

When I was looking for test props he did not have many #6 props with a dia, larger than 17 the only one with a large selection was cobra and he wanted $9500 to get in the program .

I spoke with Bblades and they do not have anything available in the 18" diameter props for testing.

I converted my 1994 38 foot Cigarette Top Gun with ASD7M drives, which is over 13000lbs with gas. If your boat weighs as much as mine, don't waste your money on 4 blades. I have Hering 5 blade, 18 Diameter, 18 Rake, 28 Pitch Props.with twin 610hp supercharged engines. They work pretty good. I am under pitched a little bit. I would love to try some 6 blades, but there are none to be found. You will most likely have to do what I did, which is purchase props and hope you get it right.