On Mon, 30 Jun 2008 15:36:13 -0600, Robert Reynolds <rob...@kcnet.com> wrote:
>I posted a couple of new articles on my website at
>www.balsaworkbench.com.  One of them involves propeller guides for 2
>stroke and 4 stroke engines.  I don't know the original source for these
>charts, and I don't have a lot of experience with engines larger than a
>.91 four stroke.  I welcome any suggestions or corrections that might
>improve the usefulness of the charts.

>Robbie

Bob Cowell wrote:
> On Mon, 30 Jun 2008 15:3
> Your charts look pretty "normal" to me ;-)

> I would add a disclaimer that props from different manufacturers vary widely in
> their performance.

> THE single BEST 16x8 I ever laid hands on was an ancient "RevUp"
> I have been buying and trying different brands and styles ever since I broke it.

> For the .40 size, PLAIN BEARING ENGINE,   a 10x5 APC seems to be a pretty good
> match for those big draggy trainers.
> bob

Robert Reynolds wrote:

> Bob Cowell wrote:
>> On Mon, 30 Jun 2008 15:3
>> Your charts look pretty "normal" to me ;-)

>> I would add a disclaimer that props from different manufacturers vary
>> widely in
>> their performance.

>> THE single BEST 16x8 I ever laid hands on was an ancient "RevUp"
>> I have been buying and trying different brands and styles ever since I
>> broke it.

>> For the .40 size, PLAIN BEARING ENGINE,   a 10x5 APC seems to be a
>> pretty good
>> match for those big draggy trainers.

>> bob

> It's funny you say that, because I use those plain bearing 40 engines
> all the time, and the 10x6 is about as much prop as you would ever put
> on one.  9x6 or 10x5 would be better, depending on the plane you're
> powering.  I have a Cloud Dancer with a 40FP and a 10x5, and it's just
> right.

> When I was punching in all those numbers for the charts my mind started
> to wander.  I should have thought of that one myself.