Re: Re: Is there a market for...

From: Jake Palmer <82.jake_at_gmail.com>
Date: Tue, 28 Jan 2014 09:32:33 -0800

Nick,

That was essentially my point. You can sell epoxy and carbon fiber, but
once you combine the two into a manufactured prop blade I think it crosses
a line.

Mike,

Free doesn't change anything. You're still utilizing a major component
that was built by someone else.


On Tue, Jan 28, 2014 at 9:09 AM, Nick Ray <lasray_at_gmail.com> wrote:

>
>
> I remember hearing that Ivan Treger planned to start selling prop
> outlines. Did that ever happen? Whole VP units are allowed at the World
> Champs. (Or at least, no one is filing formal complaints about them) In the
> way I read the BOM rule, I would interpret prop outlines as being illegal
> because outlines are pre-engineered. What I mean by that is one gets the
> benefit of the pitch distribution and planform of a prop they didn't make.
> In essence there is much more than epoxy and carbon for sale in this case.
>
> Regards,
>
> Nick
>
>
> On Tue, Jan 28, 2014 at 11:57 AM, Jake Palmer <82.jake_at_gmail.com> wrote:
>
>>
>>
>> Mike,
>>
>> I think once epoxy hits carbon you start crossing a line regarding the
>> BOM rule. If I was flying in a major competition and I found out someone
>> was using bought prop blades, I would file a formal complaint.
>>
>> Jake
>>
>>
>> On Tue, Jan 28, 2014 at 8:48 AM, mkirda_at_sbcglobal.net <
>> mkirda_at_sbcglobal.net> wrote:
>>
>>>
>>>
>>> Leo asked me some questions off-line. I am posting my answer here.
>>>
>>> Hi Leo.
>>>
>>> The only real difference is the fact that I adapted some different
>>> methods for making my mold.
>>> His way of making the center one thickness is a bit too much work for my
>>> tastes.
>>> I layered the center layer so a taper was evident when split apart. A
>>> lot less sanding. I hate sanding.
>>>
>>> I also ran it through a vacuum. I am beginning to think it is not
>>> necessary, adds some complexity, and may not be helpful.
>>>
>>> 12K tow would involve an insane amount of sanding. Even 6K is too much.
>>> 3K is what I have and works well.
>>> A single tow around will weight roughly 70mg and it is not thick enough
>>> to match Brett's 0.015" square root specification.
>>> It needs to be doubled out roughly 1/3 of the way then sanded to the
>>> specs.
>>> 82-85mg is about what they come out of the mold at.
>>>
>>> Cut to size, dip in resin, squeeze in to make sure it penetrates,
>>> squeeze out the excess, pop into vacuum bag for 10 minutes at 24" vacuum to
>>> suck out the excess resin, then wrap around the mold, let gel and post cure
>>> at the temp specified by the resin used. Pretty much the same as Brett
>>> minus the vacuum bag part.
>>>
>>> None of my sources have panned out completely yet.
>>> If something does pan out, I'll probably sell the fiber to folks since
>>> there is no other source now.
>>> It costs $2000+ per pound and the manufacturer has a 5KG minimum.
>>> It isn't clear to me that there really is a market for it though to be
>>> honest...
>>>
>>> Regards.
>>> Mike Kirda
>>>
>>>
>>
>
>
Received on Tue Jan 28 2014 - 09:32:34 CET