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GEB

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Posts: 2,172
Reply with quote  #16 
Hi Jsand
Educate yourself about MODERN Evinrude Props
This is one of the best propping guide Evinrude has released. Also explains modern hub systems that Huey refers to.
http://www.evinrude.com.au/site/defaultsite/filesystem/documents/brp_rig_propeller_select.pdf

Cheers
GEB

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Stacer 389 Territory Striker
Model No.E25DTSLAFC
Serial No. 5503333
Mid North Coast
New South Wales
Australia 
The learner will not shear the rams.

muskiemouth

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Reply with quote  #17 
Years ago I had a bad run in with with a prop and some well placed rocks. The prop was a 4 blade cyclone is it was a mangled mess, and the prop shaft was twisted. This prop had the TBX system, (not the rubber insert thing). It was fully intact. I actually question the usefulness of such a design as if it had given, perhaps the prop shaft wouldn't have twisted. From this I can't imagine how one could spin prop with a TBX hub.
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2015 Campion Chase 580 BR, 2016 G2 Etec 225 HO (E225LHAG)
mead

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Posts: 758
Reply with quote  #18 
Muskimouth, what is your expectation to the purpose of a propeller hub be it a pressed in rubber hub or the TBX hub or the mercury Flo torque system? I just wish to understand the context of your statement on usefulness.
muskiemouth

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Reply with quote  #19 
Pretty much what I glean when I search this topic on the web.

"Inserted in the prop is a splined inner hub, which serves as a shock absorber between the prop blades and the shaft."

"The splined or other non-circular cross section of the sleeve inserted between the shaft and propeller hub transmits the engine torque to the propeller, rather than friction. The polymer is weaker than the components of the propeller and engine so it fails before they do when the propeller is overloaded."



I should have added that I did the same thing once on a rubber hubbed prop way back, the prop was a right off. The prop shaft was fine, I took the boat to my dealer and the run-out was still with in tolerance.

I'm pretty sure I have read similiar things in BRP engine owners manuals also.

Have I had it all wrong?



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2015 Campion Chase 580 BR, 2016 G2 Etec 225 HO (E225LHAG)
muskiemouth

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Reply with quote  #20 
https://www.etecownersgroup.com/post/show_single_post?pid=1293701124&postcount=6&forum=116324


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2015 Campion Chase 580 BR, 2016 G2 Etec 225 HO (E225LHAG)
mead

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Reply with quote  #21 
The tone of my next comments is not intended to be combative.
I think you have found and proven there are limitations to any hub system. The hub system is shock absorbing and damage limiting. Can the hub system be sacrificial to prevent extensive damage - sometimes , sometimes not as you have seen. The unknown in any event of strikeing an underwater object is the unvisible event as it occurs. Was the strike a glancing blow? Was the strike a dead on hit? Was the object a rock, stump, or other thing? What trim angle was the lower unit at. There are so many variables. It's too bad there is no such thing as crash test dummies to let us all see the events occur in slow motion.
A twisted prop shaft is evidence the prop struck a very solid unmoveable object dead on straight and the nearly stopped the engine. Was the hub system supposed to self destruct on impact? Maybe yes but under the right set of circumstances which were not there in your case. The resulting damage is very unfortunate no matter what.

Just as another thing whether a damaged misaligned front end on a car or a damaged lower unit, I have heard many times...."I didn't hit it very hard". "Well sir the evidence shows something different. "
I don't think that is what you said. I bet there was an expletive deleted based on your description. [wink]

I hope this does not happen again.
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