Prop Size...Suggestion

[Islandtrader]

Speed will take care of itself

I am a little at lost on the number thing.

What size prop and what pitch

[Fr. Frank]

Speed will take care of itself I am a little at lost on the number thing.
What size prop and what pitch

It depends on your motor, terry. You want to have the "largest" pitch prop that you can turn and still reach 5200 rpms while fully loaded.

When I was chosing props for Wellcraft's Scarab division, we would load the boat to the maximum recommended load, and then find the prop that gave us the best performance while still able to turn the maximum rpms for that motor. We call that "propping for max of max at max". That's being able to turn maximum of the maximum rpm range while loaded at the maximum weight.

It would be helpful to know the hull weight and maximum load for the hull. I'm going to use the numbers from the old early 70's 21' Regal cuddy to start with. From that I can try to figure you're starting point for propping.

Hull weight (no power): 2175 lbs
Powertrain weight: (383/350, B1 drive) 993 lbs
Fuel weight (100 gallons): 630 lbs
8 persons @ 150 lbs ea.: 1200 lbs
Miscellaneous equipment: 300 lbs
Provisional max gross weight: 5298 lbs

For a starting point, in a Mercury Quicksilver prop, try either the Rev 4 14 5/8"D X 19"P 4-blade, or Mirage Plus 14 3/4"D X 21"P 3-blade, or the Enertia 14"D X 19"P

[Islandtrader]

Thanks,

Good numbers...my x-dimension is approx. 7 inches. So with that in mind I think if I only can try one prop at a time I will go with the Mirage...3 blade.

What do you think?

That is a lot of max weight I was thinking 1000# less. But what the heck

[76Red18]

Hey Terry I have an old mirage 17 you can try. No where enough pitch but you can see how it carries the hull. You'll need a hub kit. I'll meet you half way. Takes me about 45 minutes to get to 41 and 776. 239-565-9328.

[Islandtrader]

Hey Terry I have an old mirage 17 you can try. No where enough pitch but you can see how it carries the hull. You'll need a hub kit. I'll meet you half way. Takes me about 45 minutes to get to 41 and 776. 239-565-9328.

Rich, Thanks.I may take you up on this...however I am waiting for a callback from BBlades to see what they think before I go making a decision.

[Blue_Heron]

Terry,
If you want to try out a Mirage 21, let me know. I've got one I'm not using.
Dave

[Islandtrader]

Terry,
If you want to try out a Mirage 21, let me know. I've got one I'm not using.
Dave

Check your PM

[Fr. Frank]

Personally, I love the Mirage Plus. It may be one of the 2 or 3 best stern-lifting props out there, and is probably the #2 in a 3-blade.

If you install that 17"P, be careful not to seriously over-rev your motor. It should jump on plane, but at max of 5200 rpms, you're likely to get about 45-47 mph. And I promise you, that's still flying!

[Islandtrader]

Personally, I love the Mirage Plus. It may be one of the 2 or 3 best stern-lifting props out there, and is probably the #2 in a 3-blade.

With a review like that...What would be the #1, 3 blade prop?

[Fr. Frank]

With a review like that...What would be the #1, 3 blade prop?

PowerTech OFS3 series, IMO.