x445 cut down to 41?

[jkr]

Is there any way to detertmine the pitch of a prop?
I have a used x445 and i cut down to 41.
How much will be the pitch?

[dasboata]

stock pitch 2.478 but the pitch ratio goes up

[jkr]

stock pitch 2.478 but the pitch ratio goes up

Goes up like 1.5x41-1.6x41...?

[martin]

As said the pitch remains the same as your only reducing the diameter & not changing the angle of the blades, re ratio it would go from 1.4 x 45 to around 1.53 x 41.

[jkr]

So.
Now the prop is 1,4x41 correct?
If i wanted the pitch from the 45, i had to change the pitch to 1,53.Correct?

[dasboata]

READ ! Don't worry about it put it on the boat !

[jkr]

READ ! Don't worry about it put it on the boat !

Hehe.
That's i'm going to do!

What is ''pitch ratio''?

[Chilli]

The ratio between prop diameter and pitch.

For the 445:
Diameter: 1.77" x 1.4 pitch ratio = 2.478" of pitch

Now take the 2.479 (since pitch remains the same) and devide by 1.614"(41mm) and you come up with a new ratio of 1.535 (assuming I did my math correctly)



So Chris. Any potential problems with decreasing a props diameter significantly?? I've been told prop walk could be a problem with some props??

[dasboata]

The ratio between prop diameter and pitch.

For the 445:
Diameter: 1.77" x 1.4 pitch ratio = 2.478" of pitch

Now take the 2.479 (since pitch remains the same) and devide by 1.614"(41mm) and you come up with a new ratio of 1.535 (assuming I did my math correctly)



So Chris. Any potential problems with decreasing a props diameter significantly?? I've been told prop walk could be a problem with some props??

Most likely you would get more lift because you change the shape of the prop I doubt prop walk would be any different I would not go any higher then 1.7 Pitch ratio

[dasboata]

Hehe.
That's i'm going to do!

What is ''pitch ratio''?

LOL I knew you had no clue anyway JHF

[jkr]

LOL I knew you had no clue anyway JHF

Yes.
It's my first customized prop.In general i ballance them and make them razor sharp.

[dasboata]

Yes.
It's my first customized prop.In general i ballance them and make them razor sharp.

Just busting chops,,,, everyone starts somewhere Octura's and props are pretty toxic so wear a mask and some safety clothing !!

[jkr]

When working on props and belt sanding make sure to use the shop vacuum conected to the sander to suck the dust away from you. I wash my hands often also when doing detail prop work. Hey just like anything else........ light fuse and get away fast Ha.

I always use protection hehe.
I have to buy a belt sander cause i spend to many hours on a prop.

[TheShaughnessy]

I thought our (rc boat) props were progressive pitch not fixed pitch. I also thought this is why detounging a prop is advantageous to high end speed. It was my understanding the tounge area has the lowest pitch and becomes a limiting factor for top speed. I guess that doesn't mean the pitch will change in the middle of the blade, but what about at the outer edge?
Also why would you reduce a 47 mm prop to 41 when you can get an x442?

I just picked up an x447 and was thinking about spooning the tips and cupping them to really push a p-ltd motor, will probably end up back cutting also, but i'm gonna run eagletree on it stock to get some baseline numbers before i start any work. Darin Jordan has me convinced that higher rpm is not the absolute answer in going faster. I'm thinking an 1800 kv proboat motor with a slightly larger prop can be competitive with the AQ 2030 motor spinning a smaller prop. I know some people running an m445 on the 2030 motor so i figure i can get away with an x447 on an 1800 kv motor if i do a little work to it. Races are won and lost in the corners just as much as the straights and it is my opinion that a larger prop should be able to carry more speed in the corner and accelerate harder out of one as well. I haven't done any real world testing on this theory so at this time it is simply that, theory and speculation. Any thoughts on this prop guys?

[jkr]

Also why would you reduce a 47 mm prop to 41 when you can get an x442?

My 45 was bend on the tips (not cupped).
So i decide to cut down at 41 and i had no time to wait for other prop.