Re: RE: One piece prop spars ? ? ?

From: Jake Palmer <82.jake_at_gmail.com>
Date: Mon, 13 Jan 2014 08:18:32 -0800

I've always used adjacent cuts from a sheet to make "one piece" spars. I
draw a line on the sheet before cutting so I can keep the grain oriented
correctly. Then I use a scarf joint to join the center before I sand and
shape the spar.


On Mon, Jan 13, 2014 at 8:12 AM, <wdgowen_at_gmail.com> wrote:

>
>
> I don't think this was ever answered so here are my reasons.
>
> I think it is very important for both halves of the prop and spar assembly
> to have the same strength and flexibility. By doing the spar to blade
> assembly before the spar halves are joined it is easier to match the spars
> and glue them to the blades in exactly the same position and with exactly
> the same orientation of the grain in the spars relative to the blades. Once
> that is done you can join the halves by whatever means you prefer. My F1L
> props have a small center hub of balsa with the prop spars glued to the
> front of it. For A6 my spars overlap at the center as Kang described. For
> LPP my carbon rod hub is done as one assembly but that's a special case.
>
>
Received on Mon Jan 13 2014 - 08:18:33 CET