Prop advice highfiled om 540 90 honda

[offshore27ns]

Hello

I have a new Highfield OM 540 (Ocean Master 540T - Highfield Boats) on order. I will be rigging it with a new 90hp Honda.

I would love some help to ensure I buy the right stainless prop to get good all around performance. We will typically cruise at moderate speed. I don't need big hole shot or big top end speed. Average persons on board will be four.

please advise on the following

3 or 4 blade
diameter
pitch
recommended manufacturer

here are the specs

thanks
SPECIFICATIONS

Overall Length 5.40 m 17' 8" Internal Length 4.28 m 14' Overall Width 2.38 m 7' 10" Internal Width 1.30 m 4' 3" Dead Rise 24° Tube Diameter 52 cm 20" Number of Air Chambers 6 Maximum Load 1200 kg 2645 lb Maximum People 12 Boat Only Weight 340 kg 750 lb Recommended Power 90 hp Maximum Power 115 hp Engine Shaft XL Fuel Tank 105 l 28 gal Design Category C

[office888]

13x17 3-blade aluminum should get you started.

I don't like stainless props. They destroy lower units. I'd rather sacrifice a $150 prop than a $2500 lower unit.

[MatFromPoland]

If it is new 90 HP HONDA you have prop as a standard

Just ask for 17" pitch prop

[paintman]

What have the suppliers of the boat & engine advised?
Selecting a prop is best done by loading a boat with what will be its normal load & then running at wide open throttle to check that the revs at WOT are within the band range specified by the engine manufacturer.
Once you have that figure you can then select a prop that is going to be suited to your specific circumstances.
Be worth asking the suppliers if they have props you could try.

[offshore27ns]

Originally Posted by paintman

What have the suppliers of the boat & engine advised?
Selecting a prop is best done by loading a boat with what will be its normal load & then running at wide open throttle to check that the revs at WOT are within the band range specified by the engine manufacturer.
Once you have that figure you can then select a prop that is going to be suited to your specific circumstances.
Be worth asking the suppliers if they have props you could try.

In Canada the Honda 90's do not come with a prop and Honda does not have an exchange program. Its best to try and get as close to right as possible.

The Highfield distributor in Canada is suggested a 13.25 x19.

seems fairly accurate. what do you think?

I will go stainless rather than aluminum...much better performance and I am not concerned about rocks or debris in water.

[paintman]

Didn't know they came without a prop!
Unless you can find someone with an identical set-up I'd try the maker's suggestion as a starting point. Once you've had the opportunity to try it out you'll know whether it does what you want.
My own - hard boat - came with a 19" but is much better with the 21" it now has. ebay was useful for buying & selling props.

[offshore27ns]

does anyone have final thoughts for diameter and pitch for my set up with 90 hp Honda on the Highfiled OM540?

[jyasaki]

I've always found prop selection to be hit or miss. Theorize all you want, but when you put the boat in the water, that's what'll ice the cake.

Ask around your local dealers and see if they have loaner props you can try. They'll likely be aluminum, but will get you in the ballpark. Figure on about 100 rpm/1/4" diameter, and about 250-400 rpm/1"pitch. That's ballpark and gets wildly inaccurate the further from correct you go.

From the correct aluminum prop, drop an inch or two for stainless (stiffer, and generally more cupping.)

I prefer stainless (just seems to perform better), but run an aluminum for the same reason Office alluded to when I know I'm going into skinny water (which is usually around a lot of rocks.)


jky

[MatFromPoland]

I have been using 19" (pitch) on mine HIGHFIELD OM540DL + EVINRUDE 115.
I'm in the middle of the WOT so can suggest you to start with 17" pitch or 18" pitch if available.

In Poland you can buy very good Korean props:

13 1/4 x 17" https://srubynapedowe.pl/pl/honda-75...-x-17-h90.html

or

13 x 19" https://srubynapedowe.pl/pl/honda-75...-x-19-h90.html

The company name is BaekSan Propeller (BS.PRO)
Maybe you can buy them in Canada.

We have the same hull, I have more powerful engine so I hope my advice works for you.

>>>>>>>>>>>>>>>>>>>>

I'm not sure about 19" pitch but your boat is lighter version of mine boat (I suppose). DL version has mast, built back, rear seat with locker. I think it weight 100 or 150 kg more than yours. So maybe 19" will work but I will start with 17"

[offshore27ns]

Mat




thanks for this info. Very helpful!


I think 18 would be peferct but it seems only 19 and 17 available. I do see a 18 from Powertech though...otherwise I think I will go 17