Props--- Eat your heart out

[Doubledog]

This is about the umteenth post on props. So it is, and if you'd put your time into these like I do you'd want to show them off a little too:) Its about the only thing I can do well.

All are Prather Stainless Steel with the small one being a 220, (2) 275's, and the big one is a never mounted 280. The 220 got the face buffed out & the backs left alone. Its more just to show the size differences of them.

97TRAKIN' hands showed the dangers of doing these things but the rewards are worth it.

[Doubledog]

Its easy to see the size differences in them.

Here you can see where the back of the 220 wasn't touched.

[Doubledog]

Backs

[Doubledog]

Last one

[Doubledog]

Thinking about modding one of the 275's. Always wanted to try a Texas cut. If I can figure out a way to get both blades consistent with each other.......

[550racer]

nice!! there was a couple texas cuts on ebay...

[Doubledog]

Thats what gave me the idea. Looked like a sweet upgrade from the stock. If it eats on me enough, one of them will get done.

[97TRAKIN]

Originally posted by Doubledog

97TRAKIN' hands showed the dangers of doing these things but the rewards are worth it.
FUNNYYYYYYY lol
Talking about prop mods. The easiest mod to me is to cut off the prop tongue. The tongue helps acceleration because of it's LOW pitch compared to the rest of the blade. Because of this it also acts like a rev limiter or governor on the prop. You may lose a LITTLE low end punch after it's removed but the high end gain will more than pay off for it.

This is basicaly how it's done. Bring the leading edge even to the front hub of the prop and give it a nice flowing curve. All mods are to BOTH blades of course! To get both blades to match as close as possible just make a prop duplicator..

[haljmac]

I use an old prop shaft and a vice to get all of the blades true. Install a prop dog upside down on the shaft so that the prop can turn on it. Place the shaft in a vice pointed in a upward direction. place the prop on the shaft. Useing a streight edge on the side of the vice 90 degrees to the top of the vice, angle the shaft so that when the prop turns, its edge folows the streight edge. I will try to get a pic of this set up.

[Doubledog]

Hey guys.

I've performed a few mods before. In this photo you see an X470/3 and a 280 that got the tounges removed.

Talk about a pain the neck was the three blade. Spent a lot of time just getting it balanced, but it was fun none the less.

Any other ideas bring them on. I've got a few links to the mods and what they do for performance. If any of you have something to share, do so.

BTW, I've read somewhere's what the Texas Cut does, but can't seem to remember. Looks fairly simple.

[97TRAKIN]

By texas cut do you mean barr cut? If so it unloads the engine.
ie. You gain rpm and miles per hour.
ie. If you tried running a P280 and it bogged your engine a barr cut might help you out.

[97TRAKIN]

This is a back cut. It does the exact same thing as a barr cut.
With a back or barr cut you should pick up a few mph easily. Like everything practice makes perfect.

[97TRAKIN]

This mod is called spooning. You basically cup along the out side edge of the prop bending towards the concave side.
This lowers the lift and increase forward thrust.
Bending towards the convex side does the opposite.
This is how a lot of Cat, V and flat hull racers get away with running octura 14 series props ie. 1427, 1457/3 and so on. 14 series are high lift props best suited for riggers and hydros. You can find some high pitched props in the 14 series. By removing some/all lift you can run them on deep V's and cat's with great results.

[Doubledog]

There was a guy had some on ebay just a day or two ago. Very nice looking cut that I've seen before and didn't save it in for future reference.

Help me out 550racer if I'm wrong, but it looks very similar to the cut put on this fullscale prop.

Btw, the 280ss in the photo was back cut 1/8", rounded tips 3mm and had the tounge removed........ I know how to do a few mods;)
Nice diagram too. Some of the best I've seen.

[lovinnitro]

Nice pics and post guys. I look forward to seeing how many I can mess up now!:D

[aamick1971]

try a bar cut with the trialling egdes cut off .that cuts the governer out of the prop we did that to a prather s-215 to run on 3.5 outboard i"ll have to get a pic on here to actually show what i am talking about.

[Tomass]

how do u make props

[550racer]

heres the texas cut :D

[Doubledog]

Alright ! Now its saved and will be used for a cut on one of the 275's.

[Doubledog]

Tomass.

You asked "how do u make props".

Most of us don't make them, we start with one new in the package (stock) and sharpen & polish, cut a little bit off here, bend a little there to make it run totally different.

Its one of the more enjoyable parts of the hobby to me.:)

[550racer]

i knowticed on some prather props they have that brass tube for ur shaft is it the big props that only have them? becuse the 215 dosent have that..

[Spraguepsycho1]

I believe the bigger props come with the brass bushing, so you can run them on either a 1/4" or 3/16" shaft. The smaller/medium sized props don't need the bushing since most boats that use them stick with the 3/16 shaft.

[97TRAKIN]

Originally posted by 550racer
i knowticed on some prather props they have that brass tube for ur shaft is it the big props that only have them? becuse the 215 dosent have that..
That brass tube is used to adapt 1/4" bore props to 3/16" bore. That way you can us them on 3/16" prop shafts, or 1/4" prop shafts that are tappered down to 3/16".
The smaller props don't have them because they can only be used on 3/16" prop shafts.

[Tomass]

ok then, but i no u can make them out of copper powder crap which is bad for u

[bajaman]

Beautiful job! I'm builing a forabuck 60" cat. Do you want to do one for me?

[Doubledog]

One of those in the photo is ready for you when you want it. Never been wet except while wet sanding. ;)

Welcome also and I know the hull you're talking about. I've come real close to buying one myself. Heard nothing but good things about the hulls.