Prop hub matched to gearbox

[DogCavalry]

Is this the correct relationship between prop hub and torpedo? It looks like turbulence to me.

 

[baeckmo]

Does not seem correct, the important thing is if there is a shortcut path for the exhaust from torpedo outlet into prop hub outer surface. Could you come closer to the critical area with the camera? Also check the shape of an original Evinrude prop. There are a number of small differences in the thrust washers for the available variety of engine-prop combinations.

 

[fallguy]

I found an interesting article for you.

Evinrude E-Tech Hub/Prop problems https://www.2coolfishing.com/threads/evinrude-e-tech-hub-prop-problems.2600769/

 

[fallguy]

More reading goes into great detail about etec and exhaust venting. Wouldn't it be great if this is all exhaust related for you..or bad hub..

Did you ever line test the hub? I would if it is rubber.

RX-4 Propellers; TBX Hub Kits https://www.etecownersgroup.com/post/rx4-propellers-tbx-hub-kits-8239254

 

[DogCavalry]

Thanks fellows. There doesn't seem to be an option to select a large diameter prop hub to go with the large diameter gear case on the HO engine, so I guess the flow discontinuity is considered acceptable in the industry.

 

[powerabout]

Thanks fellows. There doesn't seem to be an option to select a large diameter prop hub to go with the large diameter gear case on the HO engine, so I guess the flow discontinuity is considered acceptable in the industry.

its creates less drag, common on many large outboards when the case is a little bigger but uses existing range of props