Powder coated props
I have seen some stainless steel mercury props that are powder coated blue. Sounds like it might be a neat thing to do. Has anyone tried this.
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blue ones are merc dealer test props.
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Would that decrease performance?
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not going to help...but if your using a blue prop from a dealer,,,the pursuit of performance is not what your after anyhow.
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we have full on board data acquisition systems with gyros, accelerometers, H data rate GPSs, and full engine data....we are still not able to correlate data to show polished vs not.
dennis C's Merc props were not... jim H's herings are.... so u tell me |
audacity -
"not going to help...but if your using a blue prop from a dealer,,,the pursuit of performance is not what your after anyhow." Don't quite understand what you are trying to say? The powdercoat looks like a nice trick thing to do if it does not decrease performance. If merc has them stock why not use one from them? Is there anything wrong with the one's from merc? |
the blue one's are "only" designated test props...NOT for sale...
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"Is there anything wrong with the one's from merc?"...yeah,,,,they don't say Hering on them!LOL
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just kind'n
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Originally posted by audacity "Is there anything wrong with the one's from merc?"...yeah,,,,they don't say Hering on them!LOL My buddies have said I may lose top end with the Herings and gain midrange. I am in no way interested in that. Whichever one's are faster are the ones I will take. |
So if they are test props I would "assume" that the powdercoating does not change the performance of the prop relative to the polished finish. There are a couple of the designated "test" props here:
http://www.mrboats.com/specials.asp?cat=ACCESSORY I think that they look cool. Do they come from merc in any other colors? |
Originally posted by PokerRunGunT/S I am trying the Hering 6 blades (27's) and a new set of labbed 28 Mercs. I currently run Labbed 30's but I am short on my RPM's. |
Originally posted by KiloKat You will need 29 Herings to compare top speed against 28 Mercs. The six blades will give you added acceleration but will also give you more bow/stern lift depending on which direction you are turning them. So I would actually need a bigger size in the 6's over the 4 blade Merc? |
No, it has nothing to do with the number of blades. Mercury's advertised pitch has always been one lower than the standard used by Hering, Rolla, etc.
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Speaking of powdercoating.....
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Originally posted by KiloKat No, it has nothing to do with the number of blades. Mercury's advertised pitch has always been one lower than the standard used by Hering, Rolla, etc. Powerguy: Sorry, wasn't trying to hijack your thread. |
dude if u can only turn a merc 28 4...there is NO way in hell your going to spin a 29 6 blade hering.
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I definately prefer the Herings for most of the conditions we run in but also carry Mercury & Rollas for special situations.
Originally posted by audacity dude if u can only turn a merc 28 4...there is NO way in hell your going to spin a 29 6 blade hering. |
How aggressively can you pitch a prop before it becomes inefficient compared to gearing up?
Roby |
I have ask the same question robyw1 to every prop guy i have found and they all answer differently,
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We have found a big diffrence between propeller manufacturers when it comes to increased pitch vs efficiency. Most of the time the bigger the pitch, the less the efficiency. So, if you have enough torque, you might consider a taller gear ratio and a more efficient (smaller) pitch prop. However, what I have been noticing in a lot of magazine articles recently is that taller gear ratios along with big pitch props are being used to achieve higher top speeds. Personally, I don't like that setup because I think it is dangerous. The boat becomes very sluggish and non responsive resulting in very poor handling. It also takes a long time to achieve top speed which in turn leaves the occupants vulnerable to higher risk for a longer period of time.
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while were on the subject, does anyone have any 5 or 6 blade Merc. #6 shaft props for sale. I will probably need 31-36 pitch.
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Originally posted by KiloKat We have found a big diffrence between propeller manufacturers when it comes to increased pitch vs efficiency. Most of the time the bigger the pitch, the less the efficiency. So, if you have enough torque, you might consider a taller gear ratio and a more efficient (smaller) pitch prop. However, what I have been noticing in a lot of magazine articles recently is that taller gear ratios along with big pitch props are being used to achieve higher top speeds. Personally, I don't like that setup because I think it is dangerous. The boat becomes very sluggish and non responsive resulting in very poor handling. It also takes a long time to achieve top speed which in turn leaves the occupants vulnerable to higher risk for a longer period of time. Thanks David. T2x....... P.S...... How long do you think powder coating will stay on a prop blade????........ At 100 I'd guess 2-3 minutes. |
Thanks Dave, I have been wondering about that for awhile.
Roby |
go have a look at pops 101 here...they are behind the times...but still some good basic info:
http://www.mercurymarine.com/chapter...ler_technology all things the same...u take a 28 B1 4 off and slide a 29 H6 on your not going to turn it...u r right setup is everything...but man,,,we are talking about painted props here.LOL |
Originally posted by audacity dude if u can only turn a merc 28 4...there is NO way in hell your going to spin a 29 6 blade hering. |
PRG what X? on what center? what boat? does it have a cabin?
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A friend of mine powdercoated his bravo 3 prop. They sandblasted and powdercoated it black. It lasted about a month before it started peeling.
DON"T WASTE YOUR MONEY !!!! |
It does give them that nice "aluminum prop" look if your trying to acheive that Dave!!! :D
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Originally posted by PokerRunGunT/S I am spinning a 4 blade 30 right now with no problem. Are they Labbed? Us yes What gear? Us 1.50 Your top end is significantly higher than mine you have to be turning 1.36's or else where is the diff? |
They kind of have the color of a french canadian front door.... sometimes the whole house.:D :D :D
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Originally posted by powerguy They kind of have the color of a french canadian front door.... sometimes the whole house.:D :D :D |
Originally posted by GLH Brandon that's what I'm turning What RPM do you turn? Us 5100 Are they Labbed? Us yes What gear? Us 1.50 Your top end is significantly higher than mine you have to be turning 1.36's or else where is the diff? |
Originally posted by PokerRunGunT/S I turn 5200 R's. I am running a 1.5 ratio. The difference is probably that our boats are totally different boats. :D :D I'll look at BAM but one turn of the wheel is one turn of the wheel If you way less then your RPM should be higher. |
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