John
We'll find the prop specs and let you know.

For the bad boy,probably all it will do is just scream....But,at least it might sound fast.....On the bright side,insurance should be less at 35 - 40....Thought we might hang some sails...get him up to 50....But,then into the wind he might stop....Decisions Decisions.

How is your Jaguar...Do you have it dialed in....You have a very nice cat...But, it should be nice...you have invested a lot of work and resources to make him special !

Come over when you will !

LE

LE-
I'll come visit ASAP: been very busy and finally get to work off-site (in Houston) on Fridays:D. I'll look for your post about the rake specs; I believe they may be 16 degree: unless they are some of the new CNC Mercs, which can be 18.
You can borrow my Merc lab 17.5x35 4 blades (16 degree rake I believe) anytime, but the diameter may be too big for your rig.
I'm looking for 5 blade props too: have been in contact with Throttle-Up and the others.
Thanks
John

PS: thanks for the nice comments

great looking props jules.

not that i am an engineer, but c.n.c' ing anything in 4 or yet 5 axis is nothing easily achieved. it takes patience and perserverence.
5 axis machines are not run of the mill. and for the most part a person whom designed the proghram to cut and run 5 axis for a prop will in fact not be happy with hand finishing anything. cleanup of 2 thou or so maybe. remember guys a human hair is bout 2 to 3 thou.

Thanks for the appreciation of the technical aspects of this project.
Yes, 5 axis programming is quite complex. The most difficult aspect is to find someone who can "think" in 5 axis. Many of the programmers we worked with who had "20 years of experience" are not capable of programming in 5 axis. This is one aspoect where experience is not a plus. Sometimes it is difficult to teach an old dog new tricks.

John,

The props are new 16.5x34 5 blade 15-16* cup.We also have a new set of 16.8 x 34 4 blade 15-16* cup......Both sets are labbed and in plastic prop boxes.

Our used props include a set of show labbed 30's,33's and 35's turned to 37, all in plastic prop boxes.... Further,we have a LH only, 17.5 x 32 that should be sold or mated with a RH.

Later,
LE

LE-
Thanks for the info.
I believe the 18* props work better with most cats, but the problem is this: is the Jag (or your Motion) one of most?
I'm watching Throttle Up to see how their CNC props work.
John

http://www.tebis.com/tebis_neu/index.php3

Tebis soft ware rocks, has all your holders, spindle etc. all built into your cad to eliminate and crashes etc. You can even view it all running on your computer before you ever go to the machine. It will show your spindle, cutters everthing all in motion, tipping twisting etc.etc.

We have several seats of it, very exspensive but makes your work and your workers very efficient. :D

Cougarman

Im running 17.5X37 herring 5 blades and 18X35 mercs ,I know all props are not going to run the same but these with different pitches do turn close to the same.
I would love to purchase a new set just a little confused on what pitch to order.
40 Skater 1:35:1 gears 1200 hp and 3.5" prop shaft height. I may try going 1/2" - 1" lower on the spacer.If the hulls handling well would it be better to go to a larger dia.
What kind of build time once orderd?
Thanks Keith

Hey Matt & Julie,

What's going on with the #6 program ? " ON THE CHIP " is going after the big dogs pretty soon and 2nd place is not an option. That being said there is gonna be a lot of long days testing down south. Are you guys gonna be in KW ? If so look me up and we'll talk

Jimmy

We will be in Key West. We will have our trailer there and will be set up in the dry pits. We arrive on Sunday and will be there all week long.
We will be bringing some #6 props with us. The number of testing propellers will not be as big as I hoped as we have been too busy filling orders. It's been crazy around the shop the past couple weeks. Lot's of long nights, several all nighters.
We will be conducting propellers inspections for the SBI/APBA for those classes that have propeller requirements as well.
You won't be able to miss us in the pits, we will be at the drivers meeting Monday morning as well.

When working with us you don't have to worry about getting stuck with a propeller that's the wrong size. We wil manufature propellers we feel is right for your application. If it's not right we then manufacture a new set with the proper adjustments made to them. We won't grind and bang on a new set of props to try to make them work.

The cast Mercury SSM props are about 2" taller in pitch than marked. Thats why the Hering 37's and Mercury 35's run the same rpm.

Give us a call and we can go over all your numbers and go from there. Our goal is not to just sell you another set of props but to make sure we get your boat running where it runs it's best.

Thanks for the quick response, sure makes the mercury props seem to have a better slip %. I will call next week.
Thanks Keith

HP, Just a FYI

There are other reasons besides initial pitch numbers as to why the Merc props record lower rpm's than the Herings (K series propellers). Only consider down sizing by "1" inch when going from Mercs to the Herings. Vintage, vintage, curves and progression, trailing edges. Are the props new? These things affect your readings and require a initial change of only 1 inch of pitch.

Diameter increase? this isn't my thresd but...............

NO

Thanks for calling today HotPursuit. I am really looking forward to working with you. Let me know what you come up with and then you can make some informed decisions.

:d

TU what does a blank one look like,sq block?

It is standard a propeller casting. However the blades are a bit thicker for machining purposes though. After machining they look like this.....

Nice looking,I am assuming it starts out as a cast product,not a block of stainless ? Do you have a pick of the casting before machining.Curious:drink:

The block of stainless would be billet and that would be very expensive. I cannot post a pic of the castings, but envision a propeller with thick blades and the color is a greyish color.

Ever wonder why forged props cost so much more than cast? :eek:

Not really.

Forged props are cut from a block of steel formed under intense pressure. the Molecular stucture is perfect. Therein lies the reason for less blade failures.

Because of the way it is formed, it comes in large blocks. This means the machining process to propeller geometry would be greatly lengthened.

The reason forged props are soooo expensive is first you have to make a set of dies to do the forging. Until recently forged props were availble only in 3 blade configurations as it wouldn't be practical to forge more than that due to the over lap of the blades.

Currently forgings are being made similar to a cereal bowl. Then the prop can be cut from that.

It takes us about 20+ hours to machine a surface drive prop from a casting. A billet block or a forging would weigh about 600 lbs. When it's finished it would weigh about 22-25 pounds. Imagine the machine time to remove 580 pounds of material. We aren't talking aluminum or cold rolled steel, that would be easy. Stainless, the 15-5, 17-4, 13-8 series, is a rather tough material to machine and material just doesn't come off that fast.

Not to mention cost of the material. A bilet block large enough to cut a 17" diameter prop from would cost about $3,000+ for the material alone. If forged, you would have to add the cost of the forging process to that.

It was a rhetorical question. :drink: Rob had asked if cast props were cut out of blocks or rough castings.

The casting is made from a mold we design and manufacture in house. It's taken us a fair amount of trial and error to get the casting where we want it. There is enough material on the casting where we a great deal of flexibility to change the design and characteristics of the propeller. While at the same time not have an excessive amount of material to remove.

what material is that prop made out of in your avatar? Is that off of a victory boat?

good info,thanks, Is anybody doing billet props, were a person doesn't mind the cost, and or would a billet prop make any difference?


I am assuming it probably looks like a blank forged crank

Julie,

The props look awesome, I'm sure they will be a big hit.

Best of luck, although I'm sure you won't need it.
Always a pleasure talking with you.

Don

Hering offers forged props, basically double the price of cast.

I am assuming that TU and Brett have forged blanks they start with?

Our props are made of castings, they are not forged. Although we certainly have the capability of maching them, as a manufacturer of propellers. Brett is not a manufacturer but rather a propeller tuning shop.

Thanks Julie. However, we do manufacture and we are a manufacturer of or own propellers and CNC'd #6 spacer plates.

Currently we only build a special application prop for the fishing and hunting industry. They are small props we designed for long tail mud motor set ups. You can learn more about them on our web site www.bblades.com. We are working on a number of other offerings to come. Hang on and we'll let you know as things progress.

We sell the complete line of Mercury propellers. We also sell the complete line of Precision Propllers and Turbo Props. We are also a Powertech dealer. In house foundry capacity is more than expensive. Some one has to do the pouring for us all.

Anyway, we modify, repair and adjust all makes of propeller castings including Hering. We do specialize in the Mercury line of cast Lab Finished and CNC'd props. We do offer specialized adjustments to the new Mercury CNC'd props that others will not touch.

When your custom or stock prop doesn't do what it is supposed to do, we are there to help.

There are other folks besides Hering that offer forged props. However, they are limited to the offerings and very expensive. Also, they have limited knowlege of set up issues. These are often Hydro propellers.

Brett

Brett

Not to mention your customer service is 2nd to none, you are personable & fun to deal with. Plus you deliver what you say you can deliver & you made my boat faster than the "other" place that said they could deliver.

No offense was meant Brett . I was simply pointing out that your an accomplished prop shop, as you know with all of the referrals I have given you this year.

Tell Chris Booe I said hi !

Julie

OUCH ::D angry-smiley-038:

billy whats up long time no talk is pink a-ok :party-smiley-004: