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Prop sharpening & other tips for new boaters

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Old 02-02-2006, 07:46 PM
  #26
Ron Olson
 
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Default RE: Prop sharpening & other tips for new boaters

All props have some degree of cup but some add or take away cupping depending on what they want out of it. Think of it as if you were swimming. Cupped hands will help you go faster through the water than if you held your fingers out straight.
There are many different types of cuts. You can cut the tongue area of the blades as some props from the factory can actually slow the boat down. There is back cutting, Barr cutting, named after Stu Barr, Texas cuts, and the list goes on.
If you want to see what effects cutting could do to your props, if you have metal props take a felt-tipped marker or a machinists blueing and paint your props. Where the marking comes off the prop once you run the boat, this is the part of the prop that is doing the work.
If you've seen that Octura has been coming out with a line of "M" series props, these are the ones that have been modified by Octura to remove unneeded prop area.
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Old 03-27-2006, 02:14 PM
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Default RE: Prop sharpening & other tips for new boaters

What are some of the advantages / disadvantages between 2 blade and 3 blade props ?
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Old 04-20-2006, 08:11 PM
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Default RE: Prop sharpening & other tips for new boaters

the prop balancer named by ron in the previosly talks is absolutly fantastic i sharpened and balanced 2 props in about 5 hours I prefer stainless to copper props as we race at sea
octura props are my choice but in malta prather are easily found booq
martin
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Old 04-20-2006, 08:14 PM
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Default RE: Prop sharpening & other tips for new boaters

i m not sure but 3 blades are suitable for nitro/high revs motors[quickdraw] 2blade are for general use
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Old 04-20-2006, 09:12 PM
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Default RE: Prop sharpening & other tips for new boaters

i found twin blade props cavitate more than three blade if you happen to spin out, but give better rpm's. Three blade props on a tunnelhull make it pull around better in a turn, due to the prop walk drag.
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Old 05-21-2006, 07:36 AM
  #31
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Default RE: Prop sharpening & other tips for new boaters

I'm not Ron, but there's a description of cupping, cutting, and other prop mods in the 4th link of the sharpening section in the first post of this thread. So you don't have to scroll to the top, it's here: http://rcboat.com/prop.htm
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Old 07-01-2006, 03:05 PM
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Default RE: Prop sharpening & other tips for new boaters

There is something I would like to point out about prop sharpening that maybe some people aren't aware of. This has been a concern of mine for quite sometime now, and maybe other people have encountered it also...but as far as I know of there really isn't a very good cure for and that is the prop fit of the prop on the propshaft.

It is very important before doing any type of balancing to the prop to get a good prop to drive shaft / drive dog fit.

There hasn't been one prop that I have picked up to sharpen and balance that needs help in this department first. If the prop does not bed completely and evenly against the face of the drive dog you will loose most of your efforts in balancing when it comes time to tighten the prop, so be sure you have cleared the corners of the notches and any other places that interfere with a nice, flat fit to the dog!

The spotface on the prop should be automatically square to the bore as this is all machined from the one side, but don't be suprised to find only one side of the spotface touch the dog. I have found this occur on some props also! I guess this is one thing that determines a good prop from a bad prop too!!!
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Old 07-12-2006, 09:42 PM
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Default RE: Prop sharpening & other tips for new boaters

You're so right there Jetpack. Can't remember the last one I did that slid right on a prop shaft & the drive dog fit perfect. One of my buddies made me a propshaft handle w/dog attached for working them & its become my standard. Fit first, then check balance & start working...[8D]
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Old 07-21-2006, 03:18 PM
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Default RE: Prop sharpening & other tips for new boaters

You guys. Any idea why my berillium copper Prather 1.6*1.4 is beding at the tips? I mean it is basically new, and hasnt hit anything. It does cavitate a good bit in tight corners, and from a stop, so I suppose the cavititation could be causing the tips to bend over backwards. Ideas appreciated.
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Old 07-21-2006, 10:57 PM
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Default RE: Prop sharpening & other tips for new boaters

Has the prop been overthinned? It's easy to go too far at the tips.
One of the locals here really thins his props and on his .21 'rigger had folded one up. Outriggers do need to have a thicker blade as they have to support weight.
Cavitating is corners means that the strut is a little too high. When the boat leans over, it is brining the prop closer to the surface. People who offset their struts slightly to the right gain 2 things, one is less tilting of the hull from torque ands the other of course is that it keeps the prop planted in more water in the turns.
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Old 07-23-2006, 12:50 PM
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Default RE: Prop sharpening & other tips for new boaters

Yes nice info page Chuck....real sweet!!!!!
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Old 07-23-2006, 01:06 PM
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Default RE: Prop sharpening & other tips for new boaters

Quote:
ORIGINAL: TwistedLiquid

Yes nice info page Chuck....real sweet!!!!!
Thanks. If you find any errors or think of additions, post them and I'll add them to the first post to make them easy to find.
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Old 08-08-2006, 08:53 PM
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Default RE: Prop sharpening & other tips for new boaters

Good info. in this thread. Thanks for all of the advice. I am new to the boating scene so I'm trying to gather any and all info I can.
thanks
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Old 01-06-2007, 06:02 PM
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Default RE: Prop sharpening & other tips for new boaters

HI GUYS I'm Setting up my first Gas Boat A 50'' Aeromarine Pro Cat I bought a Mod 1 Zenoah No Clutch Boat is Still under construction Does a 270 sound like a good starting point Also what recommendations for 3 bladed prop i'm thinking 6716? Looking for all around proformance Thanks in advance for advice , Sorry about posting on nitro forum Also what do you guys use to bring out the polished look on stainless props
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Old 01-06-2007, 06:24 PM
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Default RE: Prop sharpening & other tips for new boaters

That's fine as this thread is about props in general whether it's for nitro, electric or gas.
Sorry that I can't help you out with prop choices as I'm just getting into gas boats myself trying to expand my horizons.
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Old 01-06-2007, 06:26 PM
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Default RE: Prop sharpening & other tips for new boaters

when using a dremmel what grit do you use to sharpen with or should you use hand files
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Old 01-06-2007, 06:34 PM
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Default RE: Prop sharpening & other tips for new boaters

Ron Great tip on painting the props Part 2 of my question is how do you guys bring out the finish on the stainless
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Old 01-06-2007, 06:58 PM
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Default RE: Prop sharpening & other tips for new boaters

I've used both. Depending on the prop like stainless, it's a lot tougher than beryllium copper so I do use what I need for what part of the prop that I'm working on. I usually start with a file to get off any casting flash from the hub or the rear of the blades. The file seems to work better on the leading edges of the blades also as a Dremel has a nasty habit (to me anyway) of wanting to roll over the edges.
As far as polishing, pick your poison. I start with using the Dremel polishing wheel, the grey one which takes out the minor file marks plus adds to the shine. I've tried various metal polishes to bring out the rest of the shine. Eagle One, Mother's Mag Wheel polish and a few others I've had good luck with.
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Old 01-06-2007, 10:59 PM
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Default RE: Prop sharpening & other tips for new boaters

I've used K&S Flexi-grit for years for my final finishing on props. It works great for removing file marks and for polishing it to whatever level of shine I want. I almost never use a dremel for two reasons. First, I don't like the idea of having it spray beryllium dust everywhere. Second, I can't control the cut as well as I can with a file. It would probably be quicker with a dremel, but I only do props for myself, so the extra time isn't a big deal.
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Old 01-07-2007, 10:18 AM
  #45
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Default RE: Prop sharpening & other tips for new boaters

Thanks for info


































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Old 03-17-2007, 09:04 AM
  #46
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Default RE: Prop sharpening & other tips for new boaters

Piper or Ron, If someone could please mabey forward this thread to the FE fourm, as there are lots of new boaters there and alot of times they ask how to sharpen props, and they dont come here caz they dont got nitro. If you let me i will give full credit to you piper and ron for this, and ill copy and paste it all if ur too busy, but it sounds pretty easy. Just Pm me if u want me to do it.
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Old 03-17-2007, 09:37 AM
  #47
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Default RE: Prop sharpening & other tips for new boaters

Sure, we can move it around and will do it right now.
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Old 03-18-2007, 12:33 AM
  #48
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Default RE: Prop sharpening & other tips for new boaters

Hey ron now its not in the Nitro fourm, lol, good job posting it here, espacllay because were fastter than u.
Dan
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Old 03-20-2007, 03:27 PM
  #49
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Default RE: Prop sharpening & other tips for new boaters

Great info in this forum. Can someone please tell me, when sharping the blade, should you take material from the boat side of the blade or the nut side? I will be finishing my first prop this week and I need as much help as I can get. Thanks.
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Old 03-20-2007, 05:33 PM
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Default RE: Prop sharpening & other tips for new boaters

The front of the prop is where you remove the material. That means the part that faces the front of the boat when its mounted.

Not to be confused with the face of the prop, which is the rear cupped portion that does the pushing. That surface you want to keep true to form.

Are you confused yet?
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