what does x * x mean for a prop? - RC Groups
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Mar 03, 2004, 06:01 PM
Sven Goosen
Sven Goosen
Guest

what does x * x mean for a prop?


Hi all,

I've never used a prop for models before, now i was looking on the site from
my local RC store, and the size (i think) is indicated like this:

7 x 6 prop
or
9 x 5 prop

What do these values mean? i think it has something to do with lengt/angle
of the blades?

And how much thrust difference is there between a 3 bladed prop and a 2
bladed?

Many thanks,
Sven


Mar 03, 2004, 06:01 PM
Efulmer
Efulmer
Guest

Re: what does x * x mean for a prop?


Sven, The first number is the diameter/length and the second number is the
pitch. As for 2 and 3 blade props it all depends on the pitch and diameter.
Hopr this helps. Eddie Fulmer
Mar 03, 2004, 06:01 PM
Gerry Attric
Gerry Attric
Guest

Re: what does x * x mean for a prop?


The first number is the diameter the second the pitch which is the
theoretical distance the prop would screw itself forward in one revolution
(if the air didn't move as well)
Ian

"Sven Goosen" <sven@goosen-demon.nl> wrote in message
news:104c2n6684amb79@corp.supernews.com...
> Hi all,
>
> I've never used a prop for models before, now i was looking on the site

from
> my local RC store, and the size (i think) is indicated like this:
>
> 7 x 6 prop
> or
> 9 x 5 prop
>
> What do these values mean? i think it has something to do with lengt/angle
> of the blades?
>
> And how much thrust difference is there between a 3 bladed prop and a 2
> bladed?
>
> Many thanks,
> Sven
>
>





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