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Posting a reply to: Re: Best prop for Ranger 620 Evinrude E tech 250 HO engine

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[QUOTE]VMS - 7/16/2017  7:28 AM

Hiya,

I wonder how a 20 pitch raker would do..   the raker props are usually about 1/4" larger in diameter and are aggressuvely cupped from tip to trailing edge.  Great prop!!  I run it on my rig.  Going down to a 20 will get you another 400 or so rpms..but that could be more as well as there is a point of diminishing returns on pitch and diameter.   My rig, when I tried a 20 over an 18 could only get to 4800 as compared to 5500.

A good 4 blade can do wonders as well..  the extra fun can make a huge difference on lift...

I'd see about a renegade propeller which has the same basic design as the raker, just in a 4 blade.   An older model in the shooter could be your next bet.   I also would not overlook getting a Mercury rev4 as they have the exchangeable hub.  20 pitch in the 4 blades.

With the lighter gear ratio, you may find going down to an 18 pitch as well...  I'd hope not.  If rhe 20 pitch cannot be turned in a 3 blade, then I'd be wondering like you about a power issue..

Steve[/QUOTE]

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VMS

Posted 7/16/2017 7:28 AM (#870324 - in reply to #870200)
Subject: Re: Best prop for Ranger 620 Evinrude E tech 250 HO engine

Posts: 3483

Location: Elk River, Minnesota

Hiya,

I wonder how a 20 pitch raker would do.. the raker props are usually about 1/4" larger in diameter and are aggressuvely cupped from tip to trailing edge. Great prop!! I run it on my rig. Going down to a 20 will get you another 400 or so rpms..but that could be more as well as there is a point of diminishing returns on pitch and diameter. My rig, when I tried a 20 over an 18 could only get to 4800 as compared to 5500.

A good 4 blade can do wonders as well.. the extra fun can make a huge difference on lift...

I'd see about a renegade propeller which has the same basic design as the raker, just in a 4 blade. An older model in the shooter could be your next bet. I also would not overlook getting a Mercury rev4 as they have the exchangeable hub. 20 pitch in the 4 blades.

With the lighter gear ratio, you may find going down to an 18 pitch as well... I'd hope not. If rhe 20 pitch cannot be turned in a 3 blade, then I'd be wondering like you about a power issue..

Steve