What style prop do we like on a 20' Sceptre

[flyingfrizzle]

I done a little mercury prop testing with my 20 sceptre and it ran well with the 17 rev 4, not the fastest but best plane speed and really helped on the blow out you talk of. I have my motor up high and experience the same with the 3 blade smaller dia props. The rev-4 will run an inch or two higher than most and still be happy. The mirage 17 with raise the rpms up over the rev 4 17p prop and a mirage 19p will fall about the same rpm as the rev-4 17p. You don't get the same cupping power as the rev 4 simi-surfacing prop with the mirage but it still dose very well for a 3 blade. You will see a few mph fall off the low plane speed though with it. I currently have a 21p 14.5 dia quick silver vengeance a41 on there currently. Not much cup and it dose blow out a fair amount more. Low plane sucks but it is 4-5 mph faster on the top end than the rev 4. If I go out in the ocean or ruff conditions I throw the rev 4 on her. If I am in the creek on a slick day like most fishing days I run the light weight thin bladed a41 vengeance. The 19p mirage seems the be the best all around prop for anything you throw at it. I have the older mirage a41 17p and the newer a45 mirage plus with the ventilation holes. You can tell a difference between them as well even with the holes pluged. The older a41 props are thinner bladed and faster but do flex more. The newer ones seem better on the low end and have more cup or grip.