[ereiss]

Just how difficult is that? I need to pitch and reading the Max Prop manual is a little overwhelming. But I figure if people can do it underwater I should be able to do it on dry land. Any words of advice or warning?

Thanks

Ed Reiss
Being There
Freedom 38 #154
out of Jamestown, RI

 

[Fstbttms]

It's pretty easy once you've done it a few times. Take your time, follow the directions carefully and put it together dry as many times as it takes to be comfortable with it. I mark the proper X & Y coordinates with a paint pen before assembling the prop. This makes it easier to be sure I am pitching it correctly.

 

[xort]

Call PYI, they have VERY good tech support. You'll likely need new cotter pins. I couldn't find them that small. They sell them for .09.

Good phone support.

 

[Fstbttms]

You'll likely need new cotter pins. I couldn't find them that small.

Do not use just any cotter pins in a Max Prop. They MUST be made of monel.

 

[Spiritman]

Ed,

I found it easier to have a second pair of hands too. FST is right -- just assemble it and break it down as many times as it takes to get familiar with it and you shouldn't have a problem.

G.

 

[RanAweigh]

Large rubber bands (the ones that are about 1/2" wide) help a bunch. Particularly the tree blade. The rubber bands hold the housing in place while you fiddle with the setting.

Easier than growing another hand

 

[sailingfool]

Hopefully you have some insight on what the CORRECT pitch is...seems like determining the correct pitch is more art than science...when the yard installed the MaxProp on my boat, they subsequently pulled the boat twice for further adjustment before they felt they had it right. This was a premium yard and yes, I was charged for the hauls...$$$.

 

[ereiss]

Sailingfool (aren't we all), you wrote Hopefully you have some insight on what the CORRECT pitch is...seems like determining the correct pitch is more art than science.

Since I don't seem to be able to get my engine up to speed I was going to reduce the pitch (I think reduce means less bite). It is presently set to "spec" but the RPMs are limited in its current configuration. Can get above 2800.

Others, thanks for the advice. Looks like it is worth getting to know the prop rather than just having the yard do it. I will contact PYI for the correct pins.

Thank you, all.

Ed Reiss
Being There
Freedom 38 #154
out of Jamestown, RI

 

[djodenda]

Maybe it would be worthwhile for you to create specific thread asking for pitch recommendations for your boat/engine combination.

You might get lucky, and improve your odds of a good guess.

David

 

[genieskip]

You don't really have to guess. Call Max Prop and if you give them the data they need (boat size, engine, reduction gear) they will tell you what your settings should be. I've done that on my last two boats and they were right on each time.

 

[RanAweigh]

Ed, Supply this information and I would be happy to give you a "pretty good" guess.

VESSEL DATA:
MANUFACTURER :_______________ MODEL :_______________
OVERALL LENGTH :________ WATERLINE LENGTH :______
BEAM OVERALL :__________
MAXIMUM DISPLACEMENT :__________lbs. MINIMUM DISPLACEMENT :__________lbs.
Fuel : _____Gal. H2O: _____Gal . Holding:_____Gal

ENGINE DATA:
MANUFACTURER :________________ MODEL :________________
MAXIMUM POWER :_______________ @ R.P.M. ________________
CONTINUOUS POWER :_____________ @ R.P.M. ________________
GEAR RATIO :____________ # OF ENGINES :______
PROPELLER DATA:
MAXIMUM PROPELLER DIAMETER :_________
PRESENT PROPELLER:
MANUFACTURER :______________ MATERIAL :______________
DIAMETER :___________ PITCH :______ BLADES :_______
WHAT IS THE MAX. ENGINE R.P.M. WITH PRESENT PROPELLER :__________

 

[xort]

Do not use just any cotter pins in a Max Prop. They MUST be made of monel.

I ordered them from PYI. Are they sending me stainless?

 

[ereiss]

genieskip, I just got off the phone with Jason at PYI who suggested backing off 4 degrees (two clicks). He thinks that should get me up to about 3,200 rpm, closer to the 3,600 rpm max.

thanks

Ed Reiss
Being There
Freedom 38 #154
out of Jamestown, RI

 

[Fstbttms]

I ordered them from PYI. Are they sending me stainless?

No. If you got them from PYI, they will be monel.

 

[amarinesurveyor]

First check to make sure the throttle cable is opening the throttle lever on the fuel pump fully. You can easily check this by warming up the engine and pushing the throttle all the way to full in neutral. It may sound like it's going to blow up, but it shouldn't. It only has to be for a couple of seconds to see what the revs get to under no load (it's called no load rpm).
Your goal is to get the enigne revvng to the specified rpm in gear. If it's less, then prop adjustment is called for,

 

[badsanta]

check out the video. take your time. I set mine wrong the first year and then had it set to spec. but will reset it down a couple of degrees this spring.

PYI Inc. Max-Prop PSS Shaft Seal Seaview Radar Mounts R&D